1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) STMicroelectronics SA 2017
4 *
5 * Authors: Philippe Cornu <philippe.cornu@st.com>
6 * Yannick Fertre <yannick.fertre@st.com>
7 * Fabien Dessenne <fabien.dessenne@st.com>
8 * Mickael Reulier <mickael.reulier@st.com>
9 */
10
11 #include <linux/clk.h>
12 #include <linux/component.h>
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
15 #include <linux/media-bus-format.h>
16 #include <linux/module.h>
17 #include <linux/of_graph.h>
18 #include <linux/pinctrl/consumer.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/regmap.h>
22 #include <linux/reset.h>
23
24 #include <drm/drm_atomic.h>
25 #include <drm/drm_atomic_helper.h>
26 #include <drm/drm_blend.h>
27 #include <drm/drm_bridge.h>
28 #include <drm/drm_device.h>
29 #include <drm/drm_edid.h>
30 #include <drm/drm_fb_dma_helper.h>
31 #include <drm/drm_fourcc.h>
32 #include <drm/drm_framebuffer.h>
33 #include <drm/drm_gem_atomic_helper.h>
34 #include <drm/drm_gem_dma_helper.h>
35 #include <drm/drm_of.h>
36 #include <drm/drm_probe_helper.h>
37 #include <drm/drm_simple_kms_helper.h>
38 #include <drm/drm_vblank.h>
39
40 #include <video/videomode.h>
41
42 #include "ltdc.h"
43
44 #define NB_CRTC 1
45 #define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
46
47 #define MAX_IRQ 4
48
49 #define HWVER_10200 0x010200
50 #define HWVER_10300 0x010300
51 #define HWVER_20101 0x020101
52 #define HWVER_40100 0x040100
53
54 /*
55 * The address of some registers depends on the HW version: such registers have
56 * an extra offset specified with layer_ofs.
57 */
58 #define LAY_OFS_0 0x80
59 #define LAY_OFS_1 0x100
60 #define LAY_OFS (ldev->caps.layer_ofs)
61
62 /* Global register offsets */
63 #define LTDC_IDR 0x0000 /* IDentification */
64 #define LTDC_LCR 0x0004 /* Layer Count */
65 #define LTDC_SSCR 0x0008 /* Synchronization Size Configuration */
66 #define LTDC_BPCR 0x000C /* Back Porch Configuration */
67 #define LTDC_AWCR 0x0010 /* Active Width Configuration */
68 #define LTDC_TWCR 0x0014 /* Total Width Configuration */
69 #define LTDC_GCR 0x0018 /* Global Control */
70 #define LTDC_GC1R 0x001C /* Global Configuration 1 */
71 #define LTDC_GC2R 0x0020 /* Global Configuration 2 */
72 #define LTDC_SRCR 0x0024 /* Shadow Reload Configuration */
73 #define LTDC_GACR 0x0028 /* GAmma Correction */
74 #define LTDC_BCCR 0x002C /* Background Color Configuration */
75 #define LTDC_IER 0x0034 /* Interrupt Enable */
76 #define LTDC_ISR 0x0038 /* Interrupt Status */
77 #define LTDC_ICR 0x003C /* Interrupt Clear */
78 #define LTDC_LIPCR 0x0040 /* Line Interrupt Position Conf. */
79 #define LTDC_CPSR 0x0044 /* Current Position Status */
80 #define LTDC_CDSR 0x0048 /* Current Display Status */
81 #define LTDC_EDCR 0x0060 /* External Display Control */
82 #define LTDC_CCRCR 0x007C /* Computed CRC value */
83 #define LTDC_FUT 0x0090 /* Fifo underrun Threshold */
84
85 /* Layer register offsets */
86 #define LTDC_L1C0R (ldev->caps.layer_regs[0]) /* L1 configuration 0 */
87 #define LTDC_L1C1R (ldev->caps.layer_regs[1]) /* L1 configuration 1 */
88 #define LTDC_L1RCR (ldev->caps.layer_regs[2]) /* L1 reload control */
89 #define LTDC_L1CR (ldev->caps.layer_regs[3]) /* L1 control register */
90 #define LTDC_L1WHPCR (ldev->caps.layer_regs[4]) /* L1 window horizontal position configuration */
91 #define LTDC_L1WVPCR (ldev->caps.layer_regs[5]) /* L1 window vertical position configuration */
92 #define LTDC_L1CKCR (ldev->caps.layer_regs[6]) /* L1 color keying configuration */
93 #define LTDC_L1PFCR (ldev->caps.layer_regs[7]) /* L1 pixel format configuration */
94 #define LTDC_L1CACR (ldev->caps.layer_regs[8]) /* L1 constant alpha configuration */
95 #define LTDC_L1DCCR (ldev->caps.layer_regs[9]) /* L1 default color configuration */
96 #define LTDC_L1BFCR (ldev->caps.layer_regs[10]) /* L1 blending factors configuration */
97 #define LTDC_L1BLCR (ldev->caps.layer_regs[11]) /* L1 burst length configuration */
98 #define LTDC_L1PCR (ldev->caps.layer_regs[12]) /* L1 planar configuration */
99 #define LTDC_L1CFBAR (ldev->caps.layer_regs[13]) /* L1 color frame buffer address */
100 #define LTDC_L1CFBLR (ldev->caps.layer_regs[14]) /* L1 color frame buffer length */
101 #define LTDC_L1CFBLNR (ldev->caps.layer_regs[15]) /* L1 color frame buffer line number */
102 #define LTDC_L1AFBA0R (ldev->caps.layer_regs[16]) /* L1 auxiliary frame buffer address 0 */
103 #define LTDC_L1AFBA1R (ldev->caps.layer_regs[17]) /* L1 auxiliary frame buffer address 1 */
104 #define LTDC_L1AFBLR (ldev->caps.layer_regs[18]) /* L1 auxiliary frame buffer length */
105 #define LTDC_L1AFBLNR (ldev->caps.layer_regs[19]) /* L1 auxiliary frame buffer line number */
106 #define LTDC_L1CLUTWR (ldev->caps.layer_regs[20]) /* L1 CLUT write */
107 #define LTDC_L1CYR0R (ldev->caps.layer_regs[21]) /* L1 Conversion YCbCr RGB 0 */
108 #define LTDC_L1CYR1R (ldev->caps.layer_regs[22]) /* L1 Conversion YCbCr RGB 1 */
109 #define LTDC_L1FPF0R (ldev->caps.layer_regs[23]) /* L1 Flexible Pixel Format 0 */
110 #define LTDC_L1FPF1R (ldev->caps.layer_regs[24]) /* L1 Flexible Pixel Format 1 */
111
112 /* Bit definitions */
113 #define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */
114 #define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */
115
116 #define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */
117 #define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */
118
119 #define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */
120 #define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */
121
122 #define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */
123 #define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */
124
125 #define GCR_LTDCEN BIT(0) /* LTDC ENable */
126 #define GCR_DEN BIT(16) /* Dither ENable */
127 #define GCR_CRCEN BIT(19) /* CRC ENable */
128 #define GCR_PCPOL BIT(28) /* Pixel Clock POLarity-Inverted */
129 #define GCR_DEPOL BIT(29) /* Data Enable POLarity-High */
130 #define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity-High */
131 #define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity-High */
132
133 #define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */
134 #define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */
135 #define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */
136 #define GC1R_PBEN BIT(12) /* Precise Blending ENable */
137 #define GC1R_DT GENMASK(15, 14) /* Dithering Technique */
138 #define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */
139 #define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */
140 #define GC1R_BCP BIT(22) /* Background Colour Programmable */
141 #define GC1R_BBEN BIT(23) /* Background Blending ENabled */
142 #define GC1R_LNIP BIT(24) /* Line Number IRQ Position */
143 #define GC1R_TP BIT(25) /* Timing Programmable */
144 #define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */
145 #define GC1R_SPP BIT(27) /* Sync Polarity Programmable */
146 #define GC1R_DWP BIT(28) /* Dither Width Programmable */
147 #define GC1R_STREN BIT(29) /* STatus Registers ENabled */
148 #define GC1R_BMEN BIT(31) /* Blind Mode ENabled */
149
150 #define GC2R_EDCA BIT(0) /* External Display Control Ability */
151 #define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */
152 #define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */
153 #define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */
154 #define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */
155 #define GC2R_EDCEN BIT(7) /* External Display Control ENabled */
156
157 #define SRCR_IMR BIT(0) /* IMmediate Reload */
158 #define SRCR_VBR BIT(1) /* Vertical Blanking Reload */
159
160 #define BCCR_BCBLACK 0x00 /* Background Color BLACK */
161 #define BCCR_BCBLUE GENMASK(7, 0) /* Background Color BLUE */
162 #define BCCR_BCGREEN GENMASK(15, 8) /* Background Color GREEN */
163 #define BCCR_BCRED GENMASK(23, 16) /* Background Color RED */
164 #define BCCR_BCWHITE GENMASK(23, 0) /* Background Color WHITE */
165
166 #define IER_LIE BIT(0) /* Line Interrupt Enable */
167 #define IER_FUWIE BIT(1) /* Fifo Underrun Warning Interrupt Enable */
168 #define IER_TERRIE BIT(2) /* Transfer ERRor Interrupt Enable */
169 #define IER_RRIE BIT(3) /* Register Reload Interrupt Enable */
170 #define IER_FUEIE BIT(6) /* Fifo Underrun Error Interrupt Enable */
171 #define IER_CRCIE BIT(7) /* CRC Error Interrupt Enable */
172
173 #define CPSR_CYPOS GENMASK(15, 0) /* Current Y position */
174
175 #define ISR_LIF BIT(0) /* Line Interrupt Flag */
176 #define ISR_FUWIF BIT(1) /* Fifo Underrun Warning Interrupt Flag */
177 #define ISR_TERRIF BIT(2) /* Transfer ERRor Interrupt Flag */
178 #define ISR_RRIF BIT(3) /* Register Reload Interrupt Flag */
179 #define ISR_FUEIF BIT(6) /* Fifo Underrun Error Interrupt Flag */
180 #define ISR_CRCIF BIT(7) /* CRC Error Interrupt Flag */
181
182 #define EDCR_OCYEN BIT(25) /* Output Conversion to YCbCr 422: ENable */
183 #define EDCR_OCYSEL BIT(26) /* Output Conversion to YCbCr 422: SELection of the CCIR */
184 #define EDCR_OCYCO BIT(27) /* Output Conversion to YCbCr 422: Chrominance Order */
185
186 #define LXCR_LEN BIT(0) /* Layer ENable */
187 #define LXCR_COLKEN BIT(1) /* Color Keying Enable */
188 #define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */
189 #define LXCR_HMEN BIT(8) /* Horizontal Mirroring ENable */
190
191 #define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */
192 #define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */
193
194 #define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */
195 #define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */
196
197 #define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */
198 #define PF_FLEXIBLE 0x7 /* Flexible Pixel Format selected */
199
200 #define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */
201
202 #define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */
203 #define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */
204 #define LXBFCR_BOR GENMASK(18, 16) /* Blending ORder */
205
206 #define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */
207 #define LXCFBLR_CFBP GENMASK(31, 16) /* Color Frame Buffer Pitch in bytes */
208
209 #define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
210
211 #define LXCR_C1R_YIA BIT(0) /* Ycbcr 422 Interleaved Ability */
212 #define LXCR_C1R_YSPA BIT(1) /* Ycbcr 420 Semi-Planar Ability */
213 #define LXCR_C1R_YFPA BIT(2) /* Ycbcr 420 Full-Planar Ability */
214 #define LXCR_C1R_SCA BIT(31) /* SCaling Ability*/
215
216 #define LxPCR_YREN BIT(9) /* Y Rescale Enable for the color dynamic range */
217 #define LxPCR_OF BIT(8) /* Odd pixel First */
218 #define LxPCR_CBF BIT(7) /* CB component First */
219 #define LxPCR_YF BIT(6) /* Y component First */
220 #define LxPCR_YCM GENMASK(5, 4) /* Ycbcr Conversion Mode */
221 #define YCM_I 0x0 /* Interleaved 422 */
222 #define YCM_SP 0x1 /* Semi-Planar 420 */
223 #define YCM_FP 0x2 /* Full-Planar 420 */
224 #define LxPCR_YCEN BIT(3) /* YCbCr-to-RGB Conversion Enable */
225
226 #define LXRCR_IMR BIT(0) /* IMmediate Reload */
227 #define LXRCR_VBR BIT(1) /* Vertical Blanking Reload */
228 #define LXRCR_GRMSK BIT(2) /* Global (centralized) Reload MaSKed */
229
230 #define CLUT_SIZE 256
231
232 #define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */
233 #define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
234 #define BF1_CA 0x400 /* Constant Alpha */
235 #define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
236 #define BF2_1CA 0x005 /* 1 - Constant Alpha */
237
238 #define NB_PF 8 /* Max nb of HW pixel format */
239
240 #define FUT_DFT 128 /* Default value of fifo underrun threshold */
241
242 /*
243 * Skip the first value and the second in case CRC was enabled during
244 * the thread irq. This is to be sure CRC value is relevant for the
245 * frame.
246 */
247 #define CRC_SKIP_FRAMES 2
248
249 enum ltdc_pix_fmt {
250 PF_NONE,
251 /* RGB formats */
252 PF_ARGB8888, /* ARGB [32 bits] */
253 PF_RGBA8888, /* RGBA [32 bits] */
254 PF_ABGR8888, /* ABGR [32 bits] */
255 PF_BGRA8888, /* BGRA [32 bits] */
256 PF_RGB888, /* RGB [24 bits] */
257 PF_BGR888, /* BGR [24 bits] */
258 PF_RGB565, /* RGB [16 bits] */
259 PF_BGR565, /* BGR [16 bits] */
260 PF_ARGB1555, /* ARGB A:1 bit RGB:15 bits [16 bits] */
261 PF_ARGB4444, /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
262 /* Indexed formats */
263 PF_L8, /* Indexed 8 bits [8 bits] */
264 PF_AL44, /* Alpha:4 bits + indexed 4 bits [8 bits] */
265 PF_AL88 /* Alpha:8 bits + indexed 8 bits [16 bits] */
266 };
267
268 /* The index gives the encoding of the pixel format for an HW version */
269 static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
270 PF_ARGB8888, /* 0x00 */
271 PF_RGB888, /* 0x01 */
272 PF_RGB565, /* 0x02 */
273 PF_ARGB1555, /* 0x03 */
274 PF_ARGB4444, /* 0x04 */
275 PF_L8, /* 0x05 */
276 PF_AL44, /* 0x06 */
277 PF_AL88 /* 0x07 */
278 };
279
280 static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
281 PF_ARGB8888, /* 0x00 */
282 PF_RGB888, /* 0x01 */
283 PF_RGB565, /* 0x02 */
284 PF_RGBA8888, /* 0x03 */
285 PF_AL44, /* 0x04 */
286 PF_L8, /* 0x05 */
287 PF_ARGB1555, /* 0x06 */
288 PF_ARGB4444 /* 0x07 */
289 };
290
291 static const enum ltdc_pix_fmt ltdc_pix_fmt_a2[NB_PF] = {
292 PF_ARGB8888, /* 0x00 */
293 PF_ABGR8888, /* 0x01 */
294 PF_RGBA8888, /* 0x02 */
295 PF_BGRA8888, /* 0x03 */
296 PF_RGB565, /* 0x04 */
297 PF_BGR565, /* 0x05 */
298 PF_RGB888, /* 0x06 */
299 PF_NONE /* 0x07 */
300 };
301
302 static const u32 ltdc_drm_fmt_a0[] = {
303 DRM_FORMAT_ARGB8888,
304 DRM_FORMAT_XRGB8888,
305 DRM_FORMAT_RGB888,
306 DRM_FORMAT_RGB565,
307 DRM_FORMAT_ARGB1555,
308 DRM_FORMAT_XRGB1555,
309 DRM_FORMAT_ARGB4444,
310 DRM_FORMAT_XRGB4444,
311 DRM_FORMAT_C8
312 };
313
314 static const u32 ltdc_drm_fmt_a1[] = {
315 DRM_FORMAT_ARGB8888,
316 DRM_FORMAT_XRGB8888,
317 DRM_FORMAT_RGB888,
318 DRM_FORMAT_RGB565,
319 DRM_FORMAT_RGBA8888,
320 DRM_FORMAT_RGBX8888,
321 DRM_FORMAT_ARGB1555,
322 DRM_FORMAT_XRGB1555,
323 DRM_FORMAT_ARGB4444,
324 DRM_FORMAT_XRGB4444,
325 DRM_FORMAT_C8
326 };
327
328 static const u32 ltdc_drm_fmt_a2[] = {
329 DRM_FORMAT_ARGB8888,
330 DRM_FORMAT_XRGB8888,
331 DRM_FORMAT_ABGR8888,
332 DRM_FORMAT_XBGR8888,
333 DRM_FORMAT_RGBA8888,
334 DRM_FORMAT_RGBX8888,
335 DRM_FORMAT_BGRA8888,
336 DRM_FORMAT_BGRX8888,
337 DRM_FORMAT_RGB565,
338 DRM_FORMAT_BGR565,
339 DRM_FORMAT_RGB888,
340 DRM_FORMAT_BGR888,
341 DRM_FORMAT_ARGB1555,
342 DRM_FORMAT_XRGB1555,
343 DRM_FORMAT_ARGB4444,
344 DRM_FORMAT_XRGB4444,
345 DRM_FORMAT_C8
346 };
347
348 static const u32 ltdc_drm_fmt_ycbcr_cp[] = {
349 DRM_FORMAT_YUYV,
350 DRM_FORMAT_YVYU,
351 DRM_FORMAT_UYVY,
352 DRM_FORMAT_VYUY
353 };
354
355 static const u32 ltdc_drm_fmt_ycbcr_sp[] = {
356 DRM_FORMAT_NV12,
357 DRM_FORMAT_NV21
358 };
359
360 static const u32 ltdc_drm_fmt_ycbcr_fp[] = {
361 DRM_FORMAT_YUV420,
362 DRM_FORMAT_YVU420
363 };
364
365 /* Layer register offsets */
366 static const u32 ltdc_layer_regs_a0[] = {
367 0x80, /* L1 configuration 0 */
368 0x00, /* not available */
369 0x00, /* not available */
370 0x84, /* L1 control register */
371 0x88, /* L1 window horizontal position configuration */
372 0x8c, /* L1 window vertical position configuration */
373 0x90, /* L1 color keying configuration */
374 0x94, /* L1 pixel format configuration */
375 0x98, /* L1 constant alpha configuration */
376 0x9c, /* L1 default color configuration */
377 0xa0, /* L1 blending factors configuration */
378 0x00, /* not available */
379 0x00, /* not available */
380 0xac, /* L1 color frame buffer address */
381 0xb0, /* L1 color frame buffer length */
382 0xb4, /* L1 color frame buffer line number */
383 0x00, /* not available */
384 0x00, /* not available */
385 0x00, /* not available */
386 0x00, /* not available */
387 0xc4, /* L1 CLUT write */
388 0x00, /* not available */
389 0x00, /* not available */
390 0x00, /* not available */
391 0x00 /* not available */
392 };
393
394 static const u32 ltdc_layer_regs_a1[] = {
395 0x80, /* L1 configuration 0 */
396 0x84, /* L1 configuration 1 */
397 0x00, /* L1 reload control */
398 0x88, /* L1 control register */
399 0x8c, /* L1 window horizontal position configuration */
400 0x90, /* L1 window vertical position configuration */
401 0x94, /* L1 color keying configuration */
402 0x98, /* L1 pixel format configuration */
403 0x9c, /* L1 constant alpha configuration */
404 0xa0, /* L1 default color configuration */
405 0xa4, /* L1 blending factors configuration */
406 0xa8, /* L1 burst length configuration */
407 0x00, /* not available */
408 0xac, /* L1 color frame buffer address */
409 0xb0, /* L1 color frame buffer length */
410 0xb4, /* L1 color frame buffer line number */
411 0xb8, /* L1 auxiliary frame buffer address 0 */
412 0xbc, /* L1 auxiliary frame buffer address 1 */
413 0xc0, /* L1 auxiliary frame buffer length */
414 0xc4, /* L1 auxiliary frame buffer line number */
415 0xc8, /* L1 CLUT write */
416 0x00, /* not available */
417 0x00, /* not available */
418 0x00, /* not available */
419 0x00 /* not available */
420 };
421
422 static const u32 ltdc_layer_regs_a2[] = {
423 0x100, /* L1 configuration 0 */
424 0x104, /* L1 configuration 1 */
425 0x108, /* L1 reload control */
426 0x10c, /* L1 control register */
427 0x110, /* L1 window horizontal position configuration */
428 0x114, /* L1 window vertical position configuration */
429 0x118, /* L1 color keying configuration */
430 0x11c, /* L1 pixel format configuration */
431 0x120, /* L1 constant alpha configuration */
432 0x124, /* L1 default color configuration */
433 0x128, /* L1 blending factors configuration */
434 0x12c, /* L1 burst length configuration */
435 0x130, /* L1 planar configuration */
436 0x134, /* L1 color frame buffer address */
437 0x138, /* L1 color frame buffer length */
438 0x13c, /* L1 color frame buffer line number */
439 0x140, /* L1 auxiliary frame buffer address 0 */
440 0x144, /* L1 auxiliary frame buffer address 1 */
441 0x148, /* L1 auxiliary frame buffer length */
442 0x14c, /* L1 auxiliary frame buffer line number */
443 0x150, /* L1 CLUT write */
444 0x16c, /* L1 Conversion YCbCr RGB 0 */
445 0x170, /* L1 Conversion YCbCr RGB 1 */
446 0x174, /* L1 Flexible Pixel Format 0 */
447 0x178 /* L1 Flexible Pixel Format 1 */
448 };
449
450 static const u64 ltdc_format_modifiers[] = {
451 DRM_FORMAT_MOD_LINEAR,
452 DRM_FORMAT_MOD_INVALID
453 };
454
455 static const struct regmap_config stm32_ltdc_regmap_cfg = {
456 .reg_bits = 32,
457 .val_bits = 32,
458 .reg_stride = sizeof(u32),
459 .max_register = 0x400,
460 .use_relaxed_mmio = true,
461 .cache_type = REGCACHE_NONE,
462 };
463
464 static const u32 ltdc_ycbcr2rgb_coeffs[DRM_COLOR_ENCODING_MAX][DRM_COLOR_RANGE_MAX][2] = {
465 [DRM_COLOR_YCBCR_BT601][DRM_COLOR_YCBCR_LIMITED_RANGE] = {
466 0x02040199, /* (b_cb = 516 / r_cr = 409) */
467 0x006400D0 /* (g_cb = 100 / g_cr = 208) */
468 },
469 [DRM_COLOR_YCBCR_BT601][DRM_COLOR_YCBCR_FULL_RANGE] = {
470 0x01C60167, /* (b_cb = 454 / r_cr = 359) */
471 0x005800B7 /* (g_cb = 88 / g_cr = 183) */
472 },
473 [DRM_COLOR_YCBCR_BT709][DRM_COLOR_YCBCR_LIMITED_RANGE] = {
474 0x021D01CB, /* (b_cb = 541 / r_cr = 459) */
475 0x00370089 /* (g_cb = 55 / g_cr = 137) */
476 },
477 [DRM_COLOR_YCBCR_BT709][DRM_COLOR_YCBCR_FULL_RANGE] = {
478 0x01DB0193, /* (b_cb = 475 / r_cr = 403) */
479 0x00300078 /* (g_cb = 48 / g_cr = 120) */
480 }
481 /* BT2020 not supported */
482 };
483
crtc_to_ltdc(struct drm_crtc * crtc)484 static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc)
485 {
486 return (struct ltdc_device *)crtc->dev->dev_private;
487 }
488
plane_to_ltdc(struct drm_plane * plane)489 static inline struct ltdc_device *plane_to_ltdc(struct drm_plane *plane)
490 {
491 return (struct ltdc_device *)plane->dev->dev_private;
492 }
493
encoder_to_ltdc(struct drm_encoder * enc)494 static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc)
495 {
496 return (struct ltdc_device *)enc->dev->dev_private;
497 }
498
to_ltdc_pixelformat(u32 drm_fmt)499 static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
500 {
501 enum ltdc_pix_fmt pf;
502
503 switch (drm_fmt) {
504 case DRM_FORMAT_ARGB8888:
505 case DRM_FORMAT_XRGB8888:
506 pf = PF_ARGB8888;
507 break;
508 case DRM_FORMAT_ABGR8888:
509 case DRM_FORMAT_XBGR8888:
510 pf = PF_ABGR8888;
511 break;
512 case DRM_FORMAT_RGBA8888:
513 case DRM_FORMAT_RGBX8888:
514 pf = PF_RGBA8888;
515 break;
516 case DRM_FORMAT_BGRA8888:
517 case DRM_FORMAT_BGRX8888:
518 pf = PF_BGRA8888;
519 break;
520 case DRM_FORMAT_RGB888:
521 pf = PF_RGB888;
522 break;
523 case DRM_FORMAT_BGR888:
524 pf = PF_BGR888;
525 break;
526 case DRM_FORMAT_RGB565:
527 pf = PF_RGB565;
528 break;
529 case DRM_FORMAT_BGR565:
530 pf = PF_BGR565;
531 break;
532 case DRM_FORMAT_ARGB1555:
533 case DRM_FORMAT_XRGB1555:
534 pf = PF_ARGB1555;
535 break;
536 case DRM_FORMAT_ARGB4444:
537 case DRM_FORMAT_XRGB4444:
538 pf = PF_ARGB4444;
539 break;
540 case DRM_FORMAT_C8:
541 pf = PF_L8;
542 break;
543 default:
544 pf = PF_NONE;
545 break;
546 /* Note: There are no DRM_FORMAT for AL44 and AL88 */
547 }
548
549 return pf;
550 }
551
ltdc_set_flexible_pixel_format(struct drm_plane * plane,enum ltdc_pix_fmt pix_fmt)552 static inline u32 ltdc_set_flexible_pixel_format(struct drm_plane *plane, enum ltdc_pix_fmt pix_fmt)
553 {
554 struct ltdc_device *ldev = plane_to_ltdc(plane);
555 u32 lofs = plane->index * LAY_OFS, ret = PF_FLEXIBLE;
556 int psize, alen, apos, rlen, rpos, glen, gpos, blen, bpos;
557
558 switch (pix_fmt) {
559 case PF_BGR888:
560 psize = 3;
561 alen = 0; apos = 0; rlen = 8; rpos = 0;
562 glen = 8; gpos = 8; blen = 8; bpos = 16;
563 break;
564 case PF_ARGB1555:
565 psize = 2;
566 alen = 1; apos = 15; rlen = 5; rpos = 10;
567 glen = 5; gpos = 5; blen = 5; bpos = 0;
568 break;
569 case PF_ARGB4444:
570 psize = 2;
571 alen = 4; apos = 12; rlen = 4; rpos = 8;
572 glen = 4; gpos = 4; blen = 4; bpos = 0;
573 break;
574 case PF_L8:
575 psize = 1;
576 alen = 0; apos = 0; rlen = 8; rpos = 0;
577 glen = 8; gpos = 0; blen = 8; bpos = 0;
578 break;
579 case PF_AL44:
580 psize = 1;
581 alen = 4; apos = 4; rlen = 4; rpos = 0;
582 glen = 4; gpos = 0; blen = 4; bpos = 0;
583 break;
584 case PF_AL88:
585 psize = 2;
586 alen = 8; apos = 8; rlen = 8; rpos = 0;
587 glen = 8; gpos = 0; blen = 8; bpos = 0;
588 break;
589 default:
590 ret = NB_PF; /* error case, trace msg is handled by the caller */
591 break;
592 }
593
594 if (ret == PF_FLEXIBLE) {
595 regmap_write(ldev->regmap, LTDC_L1FPF0R + lofs,
596 (rlen << 14) + (rpos << 9) + (alen << 5) + apos);
597
598 regmap_write(ldev->regmap, LTDC_L1FPF1R + lofs,
599 (psize << 18) + (blen << 14) + (bpos << 9) + (glen << 5) + gpos);
600 }
601
602 return ret;
603 }
604
605 /*
606 * All non-alpha color formats derived from native alpha color formats are
607 * either characterized by a FourCC format code
608 */
is_xrgb(u32 drm)609 static inline u32 is_xrgb(u32 drm)
610 {
611 return ((drm & 0xFF) == 'X' || ((drm >> 8) & 0xFF) == 'X');
612 }
613
ltdc_set_ycbcr_config(struct drm_plane * plane,u32 drm_pix_fmt)614 static inline void ltdc_set_ycbcr_config(struct drm_plane *plane, u32 drm_pix_fmt)
615 {
616 struct ltdc_device *ldev = plane_to_ltdc(plane);
617 struct drm_plane_state *state = plane->state;
618 u32 lofs = plane->index * LAY_OFS;
619 u32 val;
620
621 switch (drm_pix_fmt) {
622 case DRM_FORMAT_YUYV:
623 val = (YCM_I << 4) | LxPCR_YF | LxPCR_CBF;
624 break;
625 case DRM_FORMAT_YVYU:
626 val = (YCM_I << 4) | LxPCR_YF;
627 break;
628 case DRM_FORMAT_UYVY:
629 val = (YCM_I << 4) | LxPCR_CBF;
630 break;
631 case DRM_FORMAT_VYUY:
632 val = (YCM_I << 4);
633 break;
634 case DRM_FORMAT_NV12:
635 val = (YCM_SP << 4) | LxPCR_CBF;
636 break;
637 case DRM_FORMAT_NV21:
638 val = (YCM_SP << 4);
639 break;
640 case DRM_FORMAT_YUV420:
641 case DRM_FORMAT_YVU420:
642 val = (YCM_FP << 4);
643 break;
644 default:
645 /* RGB or not a YCbCr supported format */
646 DRM_ERROR("Unsupported pixel format: %u\n", drm_pix_fmt);
647 return;
648 }
649
650 /* Enable limited range */
651 if (state->color_range == DRM_COLOR_YCBCR_LIMITED_RANGE)
652 val |= LxPCR_YREN;
653
654 /* enable ycbcr conversion */
655 val |= LxPCR_YCEN;
656
657 regmap_write(ldev->regmap, LTDC_L1PCR + lofs, val);
658 }
659
ltdc_set_ycbcr_coeffs(struct drm_plane * plane)660 static inline void ltdc_set_ycbcr_coeffs(struct drm_plane *plane)
661 {
662 struct ltdc_device *ldev = plane_to_ltdc(plane);
663 struct drm_plane_state *state = plane->state;
664 enum drm_color_encoding enc = state->color_encoding;
665 enum drm_color_range ran = state->color_range;
666 u32 lofs = plane->index * LAY_OFS;
667
668 if (enc != DRM_COLOR_YCBCR_BT601 && enc != DRM_COLOR_YCBCR_BT709) {
669 DRM_ERROR("color encoding %d not supported, use bt601 by default\n", enc);
670 /* set by default color encoding to DRM_COLOR_YCBCR_BT601 */
671 enc = DRM_COLOR_YCBCR_BT601;
672 }
673
674 if (ran != DRM_COLOR_YCBCR_LIMITED_RANGE && ran != DRM_COLOR_YCBCR_FULL_RANGE) {
675 DRM_ERROR("color range %d not supported, use limited range by default\n", ran);
676 /* set by default color range to DRM_COLOR_YCBCR_LIMITED_RANGE */
677 ran = DRM_COLOR_YCBCR_LIMITED_RANGE;
678 }
679
680 DRM_DEBUG_DRIVER("Color encoding=%d, range=%d\n", enc, ran);
681 regmap_write(ldev->regmap, LTDC_L1CYR0R + lofs,
682 ltdc_ycbcr2rgb_coeffs[enc][ran][0]);
683 regmap_write(ldev->regmap, LTDC_L1CYR1R + lofs,
684 ltdc_ycbcr2rgb_coeffs[enc][ran][1]);
685 }
686
ltdc_irq_crc_handle(struct ltdc_device * ldev,struct drm_crtc * crtc)687 static inline void ltdc_irq_crc_handle(struct ltdc_device *ldev,
688 struct drm_crtc *crtc)
689 {
690 u32 crc;
691 int ret;
692
693 if (ldev->crc_skip_count < CRC_SKIP_FRAMES) {
694 ldev->crc_skip_count++;
695 return;
696 }
697
698 /* Get the CRC of the frame */
699 ret = regmap_read(ldev->regmap, LTDC_CCRCR, &crc);
700 if (ret)
701 return;
702
703 /* Report to DRM the CRC (hw dependent feature) */
704 drm_crtc_add_crc_entry(crtc, true, drm_crtc_accurate_vblank_count(crtc), &crc);
705 }
706
ltdc_irq_thread(int irq,void * arg)707 static irqreturn_t ltdc_irq_thread(int irq, void *arg)
708 {
709 struct drm_device *ddev = arg;
710 struct ltdc_device *ldev = ddev->dev_private;
711 struct drm_crtc *crtc = drm_crtc_from_index(ddev, 0);
712
713 /* Line IRQ : trigger the vblank event */
714 if (ldev->irq_status & ISR_LIF) {
715 drm_crtc_handle_vblank(crtc);
716
717 /* Early return if CRC is not active */
718 if (ldev->crc_active)
719 ltdc_irq_crc_handle(ldev, crtc);
720 }
721
722 mutex_lock(&ldev->err_lock);
723 if (ldev->irq_status & ISR_TERRIF)
724 ldev->transfer_err++;
725 if (ldev->irq_status & ISR_FUEIF)
726 ldev->fifo_err++;
727 if (ldev->irq_status & ISR_FUWIF)
728 ldev->fifo_warn++;
729 mutex_unlock(&ldev->err_lock);
730
731 return IRQ_HANDLED;
732 }
733
ltdc_irq(int irq,void * arg)734 static irqreturn_t ltdc_irq(int irq, void *arg)
735 {
736 struct drm_device *ddev = arg;
737 struct ltdc_device *ldev = ddev->dev_private;
738
739 /*
740 * Read & Clear the interrupt status
741 * In order to write / read registers in this critical section
742 * very quickly, the regmap functions are not used.
743 */
744 ldev->irq_status = readl_relaxed(ldev->regs + LTDC_ISR);
745 writel_relaxed(ldev->irq_status, ldev->regs + LTDC_ICR);
746
747 return IRQ_WAKE_THREAD;
748 }
749
750 /*
751 * DRM_CRTC
752 */
753
ltdc_crtc_update_clut(struct drm_crtc * crtc)754 static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
755 {
756 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
757 struct drm_color_lut *lut;
758 u32 val;
759 int i;
760
761 if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut)
762 return;
763
764 lut = (struct drm_color_lut *)crtc->state->gamma_lut->data;
765
766 for (i = 0; i < CLUT_SIZE; i++, lut++) {
767 val = ((lut->red << 8) & 0xff0000) | (lut->green & 0xff00) |
768 (lut->blue >> 8) | (i << 24);
769 regmap_write(ldev->regmap, LTDC_L1CLUTWR, val);
770 }
771 }
772
ltdc_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_atomic_state * state)773 static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
774 struct drm_atomic_state *state)
775 {
776 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
777 struct drm_device *ddev = crtc->dev;
778
779 DRM_DEBUG_DRIVER("\n");
780
781 pm_runtime_get_sync(ddev->dev);
782
783 /* Sets the background color value */
784 regmap_write(ldev->regmap, LTDC_BCCR, BCCR_BCBLACK);
785
786 /* Enable IRQ */
787 regmap_set_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_RRIE | IER_TERRIE);
788
789 /* Commit shadow registers = update planes at next vblank */
790 if (!ldev->caps.plane_reg_shadow)
791 regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_VBR);
792
793 drm_crtc_vblank_on(crtc);
794 }
795
ltdc_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_atomic_state * state)796 static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
797 struct drm_atomic_state *state)
798 {
799 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
800 struct drm_device *ddev = crtc->dev;
801 int layer_index = 0;
802
803 DRM_DEBUG_DRIVER("\n");
804
805 drm_crtc_vblank_off(crtc);
806
807 /* Disable all layers */
808 for (layer_index = 0; layer_index < ldev->caps.nb_layers; layer_index++)
809 regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS,
810 LXCR_CLUTEN | LXCR_LEN, 0);
811
812 /* disable IRQ */
813 regmap_clear_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_RRIE | IER_TERRIE);
814
815 /* immediately commit disable of layers before switching off LTDC */
816 if (!ldev->caps.plane_reg_shadow)
817 regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_IMR);
818
819 pm_runtime_put_sync(ddev->dev);
820
821 /* clear interrupt error counters */
822 mutex_lock(&ldev->err_lock);
823 ldev->transfer_err = 0;
824 ldev->fifo_err = 0;
825 ldev->fifo_warn = 0;
826 mutex_unlock(&ldev->err_lock);
827 }
828
829 #define CLK_TOLERANCE_HZ 50
830
831 static enum drm_mode_status
ltdc_crtc_mode_valid(struct drm_crtc * crtc,const struct drm_display_mode * mode)832 ltdc_crtc_mode_valid(struct drm_crtc *crtc,
833 const struct drm_display_mode *mode)
834 {
835 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
836 int target = mode->clock * 1000;
837 int target_min = target - CLK_TOLERANCE_HZ;
838 int target_max = target + CLK_TOLERANCE_HZ;
839 int result;
840
841 result = clk_round_rate(ldev->pixel_clk, target);
842
843 DRM_DEBUG_DRIVER("clk rate target %d, available %d\n", target, result);
844
845 /* Filter modes according to the max frequency supported by the pads */
846 if (result > ldev->caps.pad_max_freq_hz)
847 return MODE_CLOCK_HIGH;
848
849 /*
850 * Accept all "preferred" modes:
851 * - this is important for panels because panel clock tolerances are
852 * bigger than hdmi ones and there is no reason to not accept them
853 * (the fps may vary a little but it is not a problem).
854 * - the hdmi preferred mode will be accepted too, but userland will
855 * be able to use others hdmi "valid" modes if necessary.
856 */
857 if (mode->type & DRM_MODE_TYPE_PREFERRED)
858 return MODE_OK;
859
860 /*
861 * Filter modes according to the clock value, particularly useful for
862 * hdmi modes that require precise pixel clocks.
863 */
864 if (result < target_min || result > target_max)
865 return MODE_CLOCK_RANGE;
866
867 return MODE_OK;
868 }
869
ltdc_crtc_mode_fixup(struct drm_crtc * crtc,const struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)870 static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
871 const struct drm_display_mode *mode,
872 struct drm_display_mode *adjusted_mode)
873 {
874 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
875 int rate = mode->clock * 1000;
876
877 if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
878 DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
879 return false;
880 }
881
882 adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
883
884 DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n",
885 mode->clock, adjusted_mode->clock);
886
887 return true;
888 }
889
ltdc_crtc_mode_set_nofb(struct drm_crtc * crtc)890 static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
891 {
892 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
893 struct drm_device *ddev = crtc->dev;
894 struct drm_connector_list_iter iter;
895 struct drm_connector *connector = NULL;
896 struct drm_encoder *encoder = NULL, *en_iter;
897 struct drm_bridge *bridge = NULL, *br_iter;
898 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
899 u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
900 u32 total_width, total_height;
901 u32 bus_formats = MEDIA_BUS_FMT_RGB888_1X24;
902 u32 bus_flags = 0;
903 u32 val;
904 int ret;
905
906 /* get encoder from crtc */
907 drm_for_each_encoder(en_iter, ddev)
908 if (en_iter->crtc == crtc) {
909 encoder = en_iter;
910 break;
911 }
912
913 if (encoder) {
914 /* get bridge from encoder */
915 list_for_each_entry(br_iter, &encoder->bridge_chain, chain_node)
916 if (br_iter->encoder == encoder) {
917 bridge = br_iter;
918 break;
919 }
920
921 /* Get the connector from encoder */
922 drm_connector_list_iter_begin(ddev, &iter);
923 drm_for_each_connector_iter(connector, &iter)
924 if (connector->encoder == encoder)
925 break;
926 drm_connector_list_iter_end(&iter);
927 }
928
929 if (bridge && bridge->timings) {
930 bus_flags = bridge->timings->input_bus_flags;
931 } else if (connector) {
932 bus_flags = connector->display_info.bus_flags;
933 if (connector->display_info.num_bus_formats)
934 bus_formats = connector->display_info.bus_formats[0];
935 }
936
937 if (!pm_runtime_active(ddev->dev)) {
938 ret = pm_runtime_get_sync(ddev->dev);
939 if (ret) {
940 DRM_ERROR("Failed to set mode, cannot get sync\n");
941 return;
942 }
943 }
944
945 DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name);
946 DRM_DEBUG_DRIVER("Video mode: %dx%d", mode->hdisplay, mode->vdisplay);
947 DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
948 mode->hsync_start - mode->hdisplay,
949 mode->htotal - mode->hsync_end,
950 mode->hsync_end - mode->hsync_start,
951 mode->vsync_start - mode->vdisplay,
952 mode->vtotal - mode->vsync_end,
953 mode->vsync_end - mode->vsync_start);
954
955 /* Convert video timings to ltdc timings */
956 hsync = mode->hsync_end - mode->hsync_start - 1;
957 vsync = mode->vsync_end - mode->vsync_start - 1;
958 accum_hbp = mode->htotal - mode->hsync_start - 1;
959 accum_vbp = mode->vtotal - mode->vsync_start - 1;
960 accum_act_w = accum_hbp + mode->hdisplay;
961 accum_act_h = accum_vbp + mode->vdisplay;
962 total_width = mode->htotal - 1;
963 total_height = mode->vtotal - 1;
964
965 /* Configures the HS, VS, DE and PC polarities. Default Active Low */
966 val = 0;
967
968 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
969 val |= GCR_HSPOL;
970
971 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
972 val |= GCR_VSPOL;
973
974 if (bus_flags & DRM_BUS_FLAG_DE_LOW)
975 val |= GCR_DEPOL;
976
977 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
978 val |= GCR_PCPOL;
979
980 regmap_update_bits(ldev->regmap, LTDC_GCR,
981 GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
982
983 /* Set Synchronization size */
984 val = (hsync << 16) | vsync;
985 regmap_update_bits(ldev->regmap, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
986
987 /* Set Accumulated Back porch */
988 val = (accum_hbp << 16) | accum_vbp;
989 regmap_update_bits(ldev->regmap, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
990
991 /* Set Accumulated Active Width */
992 val = (accum_act_w << 16) | accum_act_h;
993 regmap_update_bits(ldev->regmap, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
994
995 /* Set total width & height */
996 val = (total_width << 16) | total_height;
997 regmap_update_bits(ldev->regmap, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
998
999 regmap_write(ldev->regmap, LTDC_LIPCR, (accum_act_h + 1));
1000
1001 /* Configure the output format (hw version dependent) */
1002 if (ldev->caps.ycbcr_output) {
1003 /* Input video dynamic_range & colorimetry */
1004 int vic = drm_match_cea_mode(mode);
1005 u32 val;
1006
1007 if (vic == 6 || vic == 7 || vic == 21 || vic == 22 ||
1008 vic == 2 || vic == 3 || vic == 17 || vic == 18)
1009 /* ITU-R BT.601 */
1010 val = 0;
1011 else
1012 /* ITU-R BT.709 */
1013 val = EDCR_OCYSEL;
1014
1015 switch (bus_formats) {
1016 case MEDIA_BUS_FMT_YUYV8_1X16:
1017 /* enable ycbcr output converter */
1018 regmap_write(ldev->regmap, LTDC_EDCR, EDCR_OCYEN | val);
1019 break;
1020 case MEDIA_BUS_FMT_YVYU8_1X16:
1021 /* enable ycbcr output converter & invert chrominance order */
1022 regmap_write(ldev->regmap, LTDC_EDCR, EDCR_OCYEN | EDCR_OCYCO | val);
1023 break;
1024 default:
1025 /* disable ycbcr output converter */
1026 regmap_write(ldev->regmap, LTDC_EDCR, 0);
1027 break;
1028 }
1029 }
1030 }
1031
ltdc_crtc_atomic_flush(struct drm_crtc * crtc,struct drm_atomic_state * state)1032 static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
1033 struct drm_atomic_state *state)
1034 {
1035 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
1036 struct drm_device *ddev = crtc->dev;
1037 struct drm_pending_vblank_event *event = crtc->state->event;
1038
1039 DRM_DEBUG_ATOMIC("\n");
1040
1041 ltdc_crtc_update_clut(crtc);
1042
1043 /* Commit shadow registers = update planes at next vblank */
1044 if (!ldev->caps.plane_reg_shadow)
1045 regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_VBR);
1046
1047 if (event) {
1048 crtc->state->event = NULL;
1049
1050 spin_lock_irq(&ddev->event_lock);
1051 if (drm_crtc_vblank_get(crtc) == 0)
1052 drm_crtc_arm_vblank_event(crtc, event);
1053 else
1054 drm_crtc_send_vblank_event(crtc, event);
1055 spin_unlock_irq(&ddev->event_lock);
1056 }
1057 }
1058
ltdc_crtc_get_scanout_position(struct drm_crtc * crtc,bool in_vblank_irq,int * vpos,int * hpos,ktime_t * stime,ktime_t * etime,const struct drm_display_mode * mode)1059 static bool ltdc_crtc_get_scanout_position(struct drm_crtc *crtc,
1060 bool in_vblank_irq,
1061 int *vpos, int *hpos,
1062 ktime_t *stime, ktime_t *etime,
1063 const struct drm_display_mode *mode)
1064 {
1065 struct drm_device *ddev = crtc->dev;
1066 struct ltdc_device *ldev = ddev->dev_private;
1067 int line, vactive_start, vactive_end, vtotal;
1068
1069 if (stime)
1070 *stime = ktime_get();
1071
1072 /* The active area starts after vsync + front porch and ends
1073 * at vsync + front porc + display size.
1074 * The total height also include back porch.
1075 * We have 3 possible cases to handle:
1076 * - line < vactive_start: vpos = line - vactive_start and will be
1077 * negative
1078 * - vactive_start < line < vactive_end: vpos = line - vactive_start
1079 * and will be positive
1080 * - line > vactive_end: vpos = line - vtotal - vactive_start
1081 * and will negative
1082 *
1083 * Computation for the two first cases are identical so we can
1084 * simplify the code and only test if line > vactive_end
1085 */
1086 if (pm_runtime_active(ddev->dev)) {
1087 regmap_read(ldev->regmap, LTDC_CPSR, &line);
1088 line &= CPSR_CYPOS;
1089 regmap_read(ldev->regmap, LTDC_BPCR, &vactive_start);
1090 vactive_start &= BPCR_AVBP;
1091 regmap_read(ldev->regmap, LTDC_AWCR, &vactive_end);
1092 vactive_end &= AWCR_AAH;
1093 regmap_read(ldev->regmap, LTDC_TWCR, &vtotal);
1094 vtotal &= TWCR_TOTALH;
1095
1096 if (line > vactive_end)
1097 *vpos = line - vtotal - vactive_start;
1098 else
1099 *vpos = line - vactive_start;
1100 } else {
1101 *vpos = 0;
1102 }
1103
1104 *hpos = 0;
1105
1106 if (etime)
1107 *etime = ktime_get();
1108
1109 return true;
1110 }
1111
1112 static const struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
1113 .mode_valid = ltdc_crtc_mode_valid,
1114 .mode_fixup = ltdc_crtc_mode_fixup,
1115 .mode_set_nofb = ltdc_crtc_mode_set_nofb,
1116 .atomic_flush = ltdc_crtc_atomic_flush,
1117 .atomic_enable = ltdc_crtc_atomic_enable,
1118 .atomic_disable = ltdc_crtc_atomic_disable,
1119 .get_scanout_position = ltdc_crtc_get_scanout_position,
1120 };
1121
ltdc_crtc_enable_vblank(struct drm_crtc * crtc)1122 static int ltdc_crtc_enable_vblank(struct drm_crtc *crtc)
1123 {
1124 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
1125 struct drm_crtc_state *state = crtc->state;
1126
1127 DRM_DEBUG_DRIVER("\n");
1128
1129 if (state->enable)
1130 regmap_set_bits(ldev->regmap, LTDC_IER, IER_LIE);
1131 else
1132 return -EPERM;
1133
1134 return 0;
1135 }
1136
ltdc_crtc_disable_vblank(struct drm_crtc * crtc)1137 static void ltdc_crtc_disable_vblank(struct drm_crtc *crtc)
1138 {
1139 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
1140
1141 DRM_DEBUG_DRIVER("\n");
1142 regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE);
1143 }
1144
ltdc_crtc_set_crc_source(struct drm_crtc * crtc,const char * source)1145 static int ltdc_crtc_set_crc_source(struct drm_crtc *crtc, const char *source)
1146 {
1147 struct ltdc_device *ldev;
1148 int ret;
1149
1150 DRM_DEBUG_DRIVER("\n");
1151
1152 if (!crtc)
1153 return -ENODEV;
1154
1155 ldev = crtc_to_ltdc(crtc);
1156
1157 if (source && strcmp(source, "auto") == 0) {
1158 ldev->crc_active = true;
1159 ret = regmap_set_bits(ldev->regmap, LTDC_GCR, GCR_CRCEN);
1160 } else if (!source) {
1161 ldev->crc_active = false;
1162 ret = regmap_clear_bits(ldev->regmap, LTDC_GCR, GCR_CRCEN);
1163 } else {
1164 ret = -EINVAL;
1165 }
1166
1167 ldev->crc_skip_count = 0;
1168 return ret;
1169 }
1170
ltdc_crtc_verify_crc_source(struct drm_crtc * crtc,const char * source,size_t * values_cnt)1171 static int ltdc_crtc_verify_crc_source(struct drm_crtc *crtc,
1172 const char *source, size_t *values_cnt)
1173 {
1174 DRM_DEBUG_DRIVER("\n");
1175
1176 if (!crtc)
1177 return -ENODEV;
1178
1179 if (source && strcmp(source, "auto") != 0) {
1180 DRM_DEBUG_DRIVER("Unknown CRC source %s for %s\n",
1181 source, crtc->name);
1182 return -EINVAL;
1183 }
1184
1185 *values_cnt = 1;
1186 return 0;
1187 }
1188
ltdc_crtc_atomic_print_state(struct drm_printer * p,const struct drm_crtc_state * state)1189 static void ltdc_crtc_atomic_print_state(struct drm_printer *p,
1190 const struct drm_crtc_state *state)
1191 {
1192 struct drm_crtc *crtc = state->crtc;
1193 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
1194
1195 drm_printf(p, "\ttransfer_error=%d\n", ldev->transfer_err);
1196 drm_printf(p, "\tfifo_underrun_error=%d\n", ldev->fifo_err);
1197 drm_printf(p, "\tfifo_underrun_warning=%d\n", ldev->fifo_warn);
1198 drm_printf(p, "\tfifo_underrun_threshold=%d\n", ldev->fifo_threshold);
1199 }
1200
1201 static const struct drm_crtc_funcs ltdc_crtc_funcs = {
1202 .destroy = drm_crtc_cleanup,
1203 .set_config = drm_atomic_helper_set_config,
1204 .page_flip = drm_atomic_helper_page_flip,
1205 .reset = drm_atomic_helper_crtc_reset,
1206 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
1207 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
1208 .enable_vblank = ltdc_crtc_enable_vblank,
1209 .disable_vblank = ltdc_crtc_disable_vblank,
1210 .get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
1211 .atomic_print_state = ltdc_crtc_atomic_print_state,
1212 };
1213
1214 static const struct drm_crtc_funcs ltdc_crtc_with_crc_support_funcs = {
1215 .destroy = drm_crtc_cleanup,
1216 .set_config = drm_atomic_helper_set_config,
1217 .page_flip = drm_atomic_helper_page_flip,
1218 .reset = drm_atomic_helper_crtc_reset,
1219 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
1220 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
1221 .enable_vblank = ltdc_crtc_enable_vblank,
1222 .disable_vblank = ltdc_crtc_disable_vblank,
1223 .get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
1224 .set_crc_source = ltdc_crtc_set_crc_source,
1225 .verify_crc_source = ltdc_crtc_verify_crc_source,
1226 .atomic_print_state = ltdc_crtc_atomic_print_state,
1227 };
1228
1229 /*
1230 * DRM_PLANE
1231 */
1232
ltdc_plane_atomic_check(struct drm_plane * plane,struct drm_atomic_state * state)1233 static int ltdc_plane_atomic_check(struct drm_plane *plane,
1234 struct drm_atomic_state *state)
1235 {
1236 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
1237 plane);
1238 struct drm_framebuffer *fb = new_plane_state->fb;
1239 u32 src_w, src_h;
1240
1241 DRM_DEBUG_DRIVER("\n");
1242
1243 if (!fb)
1244 return 0;
1245
1246 /* convert src_ from 16:16 format */
1247 src_w = new_plane_state->src_w >> 16;
1248 src_h = new_plane_state->src_h >> 16;
1249
1250 /* Reject scaling */
1251 if (src_w != new_plane_state->crtc_w || src_h != new_plane_state->crtc_h) {
1252 DRM_DEBUG_DRIVER("Scaling is not supported");
1253
1254 return -EINVAL;
1255 }
1256
1257 return 0;
1258 }
1259
ltdc_plane_atomic_update(struct drm_plane * plane,struct drm_atomic_state * state)1260 static void ltdc_plane_atomic_update(struct drm_plane *plane,
1261 struct drm_atomic_state *state)
1262 {
1263 struct ltdc_device *ldev = plane_to_ltdc(plane);
1264 struct drm_plane_state *newstate = drm_atomic_get_new_plane_state(state,
1265 plane);
1266 struct drm_framebuffer *fb = newstate->fb;
1267 u32 lofs = plane->index * LAY_OFS;
1268 u32 x0 = newstate->crtc_x;
1269 u32 x1 = newstate->crtc_x + newstate->crtc_w - 1;
1270 u32 y0 = newstate->crtc_y;
1271 u32 y1 = newstate->crtc_y + newstate->crtc_h - 1;
1272 u32 src_x, src_y, src_w, src_h;
1273 u32 val, pitch_in_bytes, line_length, line_number, ahbp, avbp, bpcr;
1274 u32 paddr, paddr1, paddr2;
1275 enum ltdc_pix_fmt pf;
1276
1277 if (!newstate->crtc || !fb) {
1278 DRM_DEBUG_DRIVER("fb or crtc NULL");
1279 return;
1280 }
1281
1282 /* convert src_ from 16:16 format */
1283 src_x = newstate->src_x >> 16;
1284 src_y = newstate->src_y >> 16;
1285 src_w = newstate->src_w >> 16;
1286 src_h = newstate->src_h >> 16;
1287
1288 DRM_DEBUG_DRIVER("plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
1289 plane->base.id, fb->base.id,
1290 src_w, src_h, src_x, src_y,
1291 newstate->crtc_w, newstate->crtc_h,
1292 newstate->crtc_x, newstate->crtc_y);
1293
1294 regmap_read(ldev->regmap, LTDC_BPCR, &bpcr);
1295
1296 ahbp = (bpcr & BPCR_AHBP) >> 16;
1297 avbp = bpcr & BPCR_AVBP;
1298
1299 /* Configures the horizontal start and stop position */
1300 val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
1301 regmap_write_bits(ldev->regmap, LTDC_L1WHPCR + lofs,
1302 LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
1303
1304 /* Configures the vertical start and stop position */
1305 val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
1306 regmap_write_bits(ldev->regmap, LTDC_L1WVPCR + lofs,
1307 LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
1308
1309 /* Specifies the pixel format */
1310 pf = to_ltdc_pixelformat(fb->format->format);
1311 for (val = 0; val < NB_PF; val++)
1312 if (ldev->caps.pix_fmt_hw[val] == pf)
1313 break;
1314
1315 /* Use the flexible color format feature if necessary and available */
1316 if (ldev->caps.pix_fmt_flex && val == NB_PF)
1317 val = ltdc_set_flexible_pixel_format(plane, pf);
1318
1319 if (val == NB_PF) {
1320 DRM_ERROR("Pixel format %.4s not supported\n",
1321 (char *)&fb->format->format);
1322 val = 0; /* set by default ARGB 32 bits */
1323 }
1324 regmap_write_bits(ldev->regmap, LTDC_L1PFCR + lofs, LXPFCR_PF, val);
1325
1326 /* Specifies the constant alpha value */
1327 val = newstate->alpha >> 8;
1328 regmap_write_bits(ldev->regmap, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);
1329
1330 /* Specifies the blending factors */
1331 val = BF1_PAXCA | BF2_1PAXCA;
1332 if (!fb->format->has_alpha)
1333 val = BF1_CA | BF2_1CA;
1334
1335 /* Manage hw-specific capabilities */
1336 if (ldev->caps.non_alpha_only_l1 &&
1337 plane->type != DRM_PLANE_TYPE_PRIMARY)
1338 val = BF1_PAXCA | BF2_1PAXCA;
1339
1340 if (ldev->caps.dynamic_zorder) {
1341 val |= (newstate->normalized_zpos << 16);
1342 regmap_write_bits(ldev->regmap, LTDC_L1BFCR + lofs,
1343 LXBFCR_BF2 | LXBFCR_BF1 | LXBFCR_BOR, val);
1344 } else {
1345 regmap_write_bits(ldev->regmap, LTDC_L1BFCR + lofs,
1346 LXBFCR_BF2 | LXBFCR_BF1, val);
1347 }
1348
1349 /* Sets the FB address */
1350 paddr = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 0);
1351
1352 if (newstate->rotation & DRM_MODE_REFLECT_X)
1353 paddr += (fb->format->cpp[0] * (x1 - x0 + 1)) - 1;
1354
1355 if (newstate->rotation & DRM_MODE_REFLECT_Y)
1356 paddr += (fb->pitches[0] * (y1 - y0));
1357
1358 DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
1359 regmap_write(ldev->regmap, LTDC_L1CFBAR + lofs, paddr);
1360
1361 /* Configures the color frame buffer pitch in bytes & line length */
1362 line_length = fb->format->cpp[0] *
1363 (x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1;
1364
1365 if (newstate->rotation & DRM_MODE_REFLECT_Y)
1366 /* Compute negative value (signed on 16 bits) for the picth */
1367 pitch_in_bytes = 0x10000 - fb->pitches[0];
1368 else
1369 pitch_in_bytes = fb->pitches[0];
1370
1371 val = (pitch_in_bytes << 16) | line_length;
1372 regmap_write_bits(ldev->regmap, LTDC_L1CFBLR + lofs, LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
1373
1374 /* Configures the frame buffer line number */
1375 line_number = y1 - y0 + 1;
1376 regmap_write_bits(ldev->regmap, LTDC_L1CFBLNR + lofs, LXCFBLNR_CFBLN, line_number);
1377
1378 if (ldev->caps.ycbcr_input) {
1379 if (fb->format->is_yuv) {
1380 switch (fb->format->format) {
1381 case DRM_FORMAT_NV12:
1382 case DRM_FORMAT_NV21:
1383 /* Configure the auxiliary frame buffer address 0 */
1384 paddr1 = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 1);
1385
1386 if (newstate->rotation & DRM_MODE_REFLECT_X)
1387 paddr1 += ((fb->format->cpp[1] * (x1 - x0 + 1)) >> 1) - 1;
1388
1389 if (newstate->rotation & DRM_MODE_REFLECT_Y)
1390 paddr1 += (fb->pitches[1] * (y1 - y0 - 1)) >> 1;
1391
1392 regmap_write(ldev->regmap, LTDC_L1AFBA0R + lofs, paddr1);
1393 break;
1394 case DRM_FORMAT_YUV420:
1395 /* Configure the auxiliary frame buffer address 0 & 1 */
1396 paddr1 = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 1);
1397 paddr2 = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 2);
1398
1399 if (newstate->rotation & DRM_MODE_REFLECT_X) {
1400 paddr1 += ((fb->format->cpp[1] * (x1 - x0 + 1)) >> 1) - 1;
1401 paddr2 += ((fb->format->cpp[2] * (x1 - x0 + 1)) >> 1) - 1;
1402 }
1403
1404 if (newstate->rotation & DRM_MODE_REFLECT_Y) {
1405 paddr1 += (fb->pitches[1] * (y1 - y0 - 1)) >> 1;
1406 paddr2 += (fb->pitches[2] * (y1 - y0 - 1)) >> 1;
1407 }
1408
1409 regmap_write(ldev->regmap, LTDC_L1AFBA0R + lofs, paddr1);
1410 regmap_write(ldev->regmap, LTDC_L1AFBA1R + lofs, paddr2);
1411 break;
1412 case DRM_FORMAT_YVU420:
1413 /* Configure the auxiliary frame buffer address 0 & 1 */
1414 paddr1 = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 2);
1415 paddr2 = (u32)drm_fb_dma_get_gem_addr(fb, newstate, 1);
1416
1417 if (newstate->rotation & DRM_MODE_REFLECT_X) {
1418 paddr1 += ((fb->format->cpp[1] * (x1 - x0 + 1)) >> 1) - 1;
1419 paddr2 += ((fb->format->cpp[2] * (x1 - x0 + 1)) >> 1) - 1;
1420 }
1421
1422 if (newstate->rotation & DRM_MODE_REFLECT_Y) {
1423 paddr1 += (fb->pitches[1] * (y1 - y0 - 1)) >> 1;
1424 paddr2 += (fb->pitches[2] * (y1 - y0 - 1)) >> 1;
1425 }
1426
1427 regmap_write(ldev->regmap, LTDC_L1AFBA0R + lofs, paddr1);
1428 regmap_write(ldev->regmap, LTDC_L1AFBA1R + lofs, paddr2);
1429 break;
1430 }
1431
1432 /*
1433 * Set the length and the number of lines of the auxiliary
1434 * buffers if the framebuffer contains more than one plane.
1435 */
1436 if (fb->format->num_planes > 1) {
1437 if (newstate->rotation & DRM_MODE_REFLECT_Y)
1438 /*
1439 * Compute negative value (signed on 16 bits)
1440 * for the picth
1441 */
1442 pitch_in_bytes = 0x10000 - fb->pitches[1];
1443 else
1444 pitch_in_bytes = fb->pitches[1];
1445
1446 line_length = ((fb->format->cpp[1] * (x1 - x0 + 1)) >> 1) +
1447 (ldev->caps.bus_width >> 3) - 1;
1448
1449 /* Configure the auxiliary buffer length */
1450 val = (pitch_in_bytes << 16) | line_length;
1451 regmap_write(ldev->regmap, LTDC_L1AFBLR + lofs, val);
1452
1453 /* Configure the auxiliary frame buffer line number */
1454 val = line_number >> 1;
1455 regmap_write(ldev->regmap, LTDC_L1AFBLNR + lofs, val);
1456 }
1457
1458 /* Configure YCbC conversion coefficient */
1459 ltdc_set_ycbcr_coeffs(plane);
1460
1461 /* Configure YCbCr format and enable/disable conversion */
1462 ltdc_set_ycbcr_config(plane, fb->format->format);
1463 } else {
1464 /* disable ycbcr conversion */
1465 regmap_write(ldev->regmap, LTDC_L1PCR + lofs, 0);
1466 }
1467 }
1468
1469 /* Enable layer and CLUT if needed */
1470 val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
1471 val |= LXCR_LEN;
1472
1473 /* Enable horizontal mirroring if requested */
1474 if (newstate->rotation & DRM_MODE_REFLECT_X)
1475 val |= LXCR_HMEN;
1476
1477 regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_LEN | LXCR_CLUTEN | LXCR_HMEN, val);
1478
1479 /* Commit shadow registers = update plane at next vblank */
1480 if (ldev->caps.plane_reg_shadow)
1481 regmap_write_bits(ldev->regmap, LTDC_L1RCR + lofs,
1482 LXRCR_IMR | LXRCR_VBR | LXRCR_GRMSK, LXRCR_VBR);
1483
1484 ldev->plane_fpsi[plane->index].counter++;
1485
1486 mutex_lock(&ldev->err_lock);
1487 if (ldev->transfer_err) {
1488 DRM_WARN("ltdc transfer error: %d\n", ldev->transfer_err);
1489 ldev->transfer_err = 0;
1490 }
1491
1492 if (ldev->caps.fifo_threshold) {
1493 if (ldev->fifo_err) {
1494 DRM_WARN("ltdc fifo underrun: please verify display mode\n");
1495 ldev->fifo_err = 0;
1496 }
1497 } else {
1498 if (ldev->fifo_warn >= ldev->fifo_threshold) {
1499 DRM_WARN("ltdc fifo underrun: please verify display mode\n");
1500 ldev->fifo_warn = 0;
1501 }
1502 }
1503 mutex_unlock(&ldev->err_lock);
1504 }
1505
ltdc_plane_atomic_disable(struct drm_plane * plane,struct drm_atomic_state * state)1506 static void ltdc_plane_atomic_disable(struct drm_plane *plane,
1507 struct drm_atomic_state *state)
1508 {
1509 struct drm_plane_state *oldstate = drm_atomic_get_old_plane_state(state,
1510 plane);
1511 struct ltdc_device *ldev = plane_to_ltdc(plane);
1512 u32 lofs = plane->index * LAY_OFS;
1513
1514 /* Disable layer */
1515 regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_LEN | LXCR_CLUTEN | LXCR_HMEN, 0);
1516
1517 /* Commit shadow registers = update plane at next vblank */
1518 if (ldev->caps.plane_reg_shadow)
1519 regmap_write_bits(ldev->regmap, LTDC_L1RCR + lofs,
1520 LXRCR_IMR | LXRCR_VBR | LXRCR_GRMSK, LXRCR_VBR);
1521
1522 DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
1523 oldstate->crtc->base.id, plane->base.id);
1524 }
1525
ltdc_plane_atomic_print_state(struct drm_printer * p,const struct drm_plane_state * state)1526 static void ltdc_plane_atomic_print_state(struct drm_printer *p,
1527 const struct drm_plane_state *state)
1528 {
1529 struct drm_plane *plane = state->plane;
1530 struct ltdc_device *ldev = plane_to_ltdc(plane);
1531 struct fps_info *fpsi = &ldev->plane_fpsi[plane->index];
1532 int ms_since_last;
1533 ktime_t now;
1534
1535 now = ktime_get();
1536 ms_since_last = ktime_to_ms(ktime_sub(now, fpsi->last_timestamp));
1537
1538 drm_printf(p, "\tuser_updates=%dfps\n",
1539 DIV_ROUND_CLOSEST(fpsi->counter * 1000, ms_since_last));
1540
1541 fpsi->last_timestamp = now;
1542 fpsi->counter = 0;
1543 }
1544
1545 static const struct drm_plane_funcs ltdc_plane_funcs = {
1546 .update_plane = drm_atomic_helper_update_plane,
1547 .disable_plane = drm_atomic_helper_disable_plane,
1548 .destroy = drm_plane_cleanup,
1549 .reset = drm_atomic_helper_plane_reset,
1550 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
1551 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
1552 .atomic_print_state = ltdc_plane_atomic_print_state,
1553 };
1554
1555 static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
1556 .atomic_check = ltdc_plane_atomic_check,
1557 .atomic_update = ltdc_plane_atomic_update,
1558 .atomic_disable = ltdc_plane_atomic_disable,
1559 };
1560
ltdc_plane_create(struct drm_device * ddev,enum drm_plane_type type,int index)1561 static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
1562 enum drm_plane_type type,
1563 int index)
1564 {
1565 unsigned long possible_crtcs = CRTC_MASK;
1566 struct ltdc_device *ldev = ddev->dev_private;
1567 struct device *dev = ddev->dev;
1568 struct drm_plane *plane;
1569 unsigned int i, nb_fmt = 0;
1570 u32 *formats;
1571 u32 drm_fmt;
1572 const u64 *modifiers = ltdc_format_modifiers;
1573 u32 lofs = index * LAY_OFS;
1574 u32 val;
1575 int ret;
1576
1577 /* Allocate the biggest size according to supported color formats */
1578 formats = devm_kzalloc(dev, (ldev->caps.pix_fmt_nb +
1579 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_cp) +
1580 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_sp) +
1581 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_fp)) *
1582 sizeof(*formats), GFP_KERNEL);
1583
1584 for (i = 0; i < ldev->caps.pix_fmt_nb; i++) {
1585 drm_fmt = ldev->caps.pix_fmt_drm[i];
1586
1587 /* Manage hw-specific capabilities */
1588 if (ldev->caps.non_alpha_only_l1)
1589 /* XR24 & RX24 like formats supported only on primary layer */
1590 if (type != DRM_PLANE_TYPE_PRIMARY && is_xrgb(drm_fmt))
1591 continue;
1592
1593 formats[nb_fmt++] = drm_fmt;
1594 }
1595
1596 /* Add YCbCr supported pixel formats */
1597 if (ldev->caps.ycbcr_input) {
1598 regmap_read(ldev->regmap, LTDC_L1C1R + lofs, &val);
1599 if (val & LXCR_C1R_YIA) {
1600 memcpy(&formats[nb_fmt], ltdc_drm_fmt_ycbcr_cp,
1601 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_cp) * sizeof(*formats));
1602 nb_fmt += ARRAY_SIZE(ltdc_drm_fmt_ycbcr_cp);
1603 }
1604 if (val & LXCR_C1R_YSPA) {
1605 memcpy(&formats[nb_fmt], ltdc_drm_fmt_ycbcr_sp,
1606 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_sp) * sizeof(*formats));
1607 nb_fmt += ARRAY_SIZE(ltdc_drm_fmt_ycbcr_sp);
1608 }
1609 if (val & LXCR_C1R_YFPA) {
1610 memcpy(&formats[nb_fmt], ltdc_drm_fmt_ycbcr_fp,
1611 ARRAY_SIZE(ltdc_drm_fmt_ycbcr_fp) * sizeof(*formats));
1612 nb_fmt += ARRAY_SIZE(ltdc_drm_fmt_ycbcr_fp);
1613 }
1614 }
1615
1616 plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
1617 if (!plane)
1618 return NULL;
1619
1620 ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
1621 <dc_plane_funcs, formats, nb_fmt,
1622 modifiers, type, NULL);
1623 if (ret < 0)
1624 return NULL;
1625
1626 if (ldev->caps.ycbcr_input) {
1627 if (val & (LXCR_C1R_YIA | LXCR_C1R_YSPA | LXCR_C1R_YFPA))
1628 drm_plane_create_color_properties(plane,
1629 BIT(DRM_COLOR_YCBCR_BT601) |
1630 BIT(DRM_COLOR_YCBCR_BT709),
1631 BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
1632 BIT(DRM_COLOR_YCBCR_FULL_RANGE),
1633 DRM_COLOR_YCBCR_BT601,
1634 DRM_COLOR_YCBCR_LIMITED_RANGE);
1635 }
1636
1637 drm_plane_helper_add(plane, <dc_plane_helper_funcs);
1638
1639 drm_plane_create_alpha_property(plane);
1640
1641 DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
1642
1643 return plane;
1644 }
1645
ltdc_plane_destroy_all(struct drm_device * ddev)1646 static void ltdc_plane_destroy_all(struct drm_device *ddev)
1647 {
1648 struct drm_plane *plane, *plane_temp;
1649
1650 list_for_each_entry_safe(plane, plane_temp,
1651 &ddev->mode_config.plane_list, head)
1652 drm_plane_cleanup(plane);
1653 }
1654
ltdc_crtc_init(struct drm_device * ddev,struct drm_crtc * crtc)1655 static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
1656 {
1657 struct ltdc_device *ldev = ddev->dev_private;
1658 struct drm_plane *primary, *overlay;
1659 int supported_rotations = DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y;
1660 unsigned int i;
1661 int ret;
1662
1663 primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY, 0);
1664 if (!primary) {
1665 DRM_ERROR("Can not create primary plane\n");
1666 return -EINVAL;
1667 }
1668
1669 if (ldev->caps.dynamic_zorder)
1670 drm_plane_create_zpos_property(primary, 0, 0, ldev->caps.nb_layers - 1);
1671 else
1672 drm_plane_create_zpos_immutable_property(primary, 0);
1673
1674 if (ldev->caps.plane_rotation)
1675 drm_plane_create_rotation_property(primary, DRM_MODE_ROTATE_0,
1676 supported_rotations);
1677
1678 /* Init CRTC according to its hardware features */
1679 if (ldev->caps.crc)
1680 ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
1681 <dc_crtc_with_crc_support_funcs, NULL);
1682 else
1683 ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
1684 <dc_crtc_funcs, NULL);
1685 if (ret) {
1686 DRM_ERROR("Can not initialize CRTC\n");
1687 goto cleanup;
1688 }
1689
1690 drm_crtc_helper_add(crtc, <dc_crtc_helper_funcs);
1691
1692 drm_mode_crtc_set_gamma_size(crtc, CLUT_SIZE);
1693 drm_crtc_enable_color_mgmt(crtc, 0, false, CLUT_SIZE);
1694
1695 DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
1696
1697 /* Add planes. Note : the first layer is used by primary plane */
1698 for (i = 1; i < ldev->caps.nb_layers; i++) {
1699 overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY, i);
1700 if (!overlay) {
1701 ret = -ENOMEM;
1702 DRM_ERROR("Can not create overlay plane %d\n", i);
1703 goto cleanup;
1704 }
1705 if (ldev->caps.dynamic_zorder)
1706 drm_plane_create_zpos_property(overlay, i, 0, ldev->caps.nb_layers - 1);
1707 else
1708 drm_plane_create_zpos_immutable_property(overlay, i);
1709
1710 if (ldev->caps.plane_rotation)
1711 drm_plane_create_rotation_property(overlay, DRM_MODE_ROTATE_0,
1712 supported_rotations);
1713 }
1714
1715 return 0;
1716
1717 cleanup:
1718 ltdc_plane_destroy_all(ddev);
1719 return ret;
1720 }
1721
ltdc_encoder_disable(struct drm_encoder * encoder)1722 static void ltdc_encoder_disable(struct drm_encoder *encoder)
1723 {
1724 struct drm_device *ddev = encoder->dev;
1725 struct ltdc_device *ldev = ddev->dev_private;
1726
1727 DRM_DEBUG_DRIVER("\n");
1728
1729 /* Disable LTDC */
1730 regmap_clear_bits(ldev->regmap, LTDC_GCR, GCR_LTDCEN);
1731
1732 /* Set to sleep state the pinctrl whatever type of encoder */
1733 pinctrl_pm_select_sleep_state(ddev->dev);
1734 }
1735
ltdc_encoder_enable(struct drm_encoder * encoder)1736 static void ltdc_encoder_enable(struct drm_encoder *encoder)
1737 {
1738 struct drm_device *ddev = encoder->dev;
1739 struct ltdc_device *ldev = ddev->dev_private;
1740
1741 DRM_DEBUG_DRIVER("\n");
1742
1743 /* set fifo underrun threshold register */
1744 if (ldev->caps.fifo_threshold)
1745 regmap_write(ldev->regmap, LTDC_FUT, ldev->fifo_threshold);
1746
1747 /* Enable LTDC */
1748 regmap_set_bits(ldev->regmap, LTDC_GCR, GCR_LTDCEN);
1749 }
1750
ltdc_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)1751 static void ltdc_encoder_mode_set(struct drm_encoder *encoder,
1752 struct drm_display_mode *mode,
1753 struct drm_display_mode *adjusted_mode)
1754 {
1755 struct drm_device *ddev = encoder->dev;
1756
1757 DRM_DEBUG_DRIVER("\n");
1758
1759 /*
1760 * Set to default state the pinctrl only with DPI type.
1761 * Others types like DSI, don't need pinctrl due to
1762 * internal bridge (the signals do not come out of the chipset).
1763 */
1764 if (encoder->encoder_type == DRM_MODE_ENCODER_DPI)
1765 pinctrl_pm_select_default_state(ddev->dev);
1766 }
1767
1768 static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = {
1769 .disable = ltdc_encoder_disable,
1770 .enable = ltdc_encoder_enable,
1771 .mode_set = ltdc_encoder_mode_set,
1772 };
1773
ltdc_encoder_init(struct drm_device * ddev,struct drm_bridge * bridge)1774 static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
1775 {
1776 struct drm_encoder *encoder;
1777 int ret;
1778
1779 encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
1780 if (!encoder)
1781 return -ENOMEM;
1782
1783 encoder->possible_crtcs = CRTC_MASK;
1784 encoder->possible_clones = 0; /* No cloning support */
1785
1786 drm_simple_encoder_init(ddev, encoder, DRM_MODE_ENCODER_DPI);
1787
1788 drm_encoder_helper_add(encoder, <dc_encoder_helper_funcs);
1789
1790 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
1791 if (ret) {
1792 if (ret != -EPROBE_DEFER)
1793 drm_encoder_cleanup(encoder);
1794 return ret;
1795 }
1796
1797 DRM_DEBUG_DRIVER("Bridge encoder:%d created\n", encoder->base.id);
1798
1799 return 0;
1800 }
1801
ltdc_get_caps(struct drm_device * ddev)1802 static int ltdc_get_caps(struct drm_device *ddev)
1803 {
1804 struct ltdc_device *ldev = ddev->dev_private;
1805 u32 bus_width_log2, lcr, gc2r;
1806
1807 /*
1808 * at least 1 layer must be managed & the number of layers
1809 * must not exceed LTDC_MAX_LAYER
1810 */
1811 regmap_read(ldev->regmap, LTDC_LCR, &lcr);
1812
1813 ldev->caps.nb_layers = clamp((int)lcr, 1, LTDC_MAX_LAYER);
1814
1815 /* set data bus width */
1816 regmap_read(ldev->regmap, LTDC_GC2R, &gc2r);
1817 bus_width_log2 = (gc2r & GC2R_BW) >> 4;
1818 ldev->caps.bus_width = 8 << bus_width_log2;
1819 regmap_read(ldev->regmap, LTDC_IDR, &ldev->caps.hw_version);
1820
1821 switch (ldev->caps.hw_version) {
1822 case HWVER_10200:
1823 case HWVER_10300:
1824 ldev->caps.layer_ofs = LAY_OFS_0;
1825 ldev->caps.layer_regs = ltdc_layer_regs_a0;
1826 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
1827 ldev->caps.pix_fmt_drm = ltdc_drm_fmt_a0;
1828 ldev->caps.pix_fmt_nb = ARRAY_SIZE(ltdc_drm_fmt_a0);
1829 ldev->caps.pix_fmt_flex = false;
1830 /*
1831 * Hw older versions support non-alpha color formats derived
1832 * from native alpha color formats only on the primary layer.
1833 * For instance, RG16 native format without alpha works fine
1834 * on 2nd layer but XR24 (derived color format from AR24)
1835 * does not work on 2nd layer.
1836 */
1837 ldev->caps.non_alpha_only_l1 = true;
1838 ldev->caps.pad_max_freq_hz = 90000000;
1839 if (ldev->caps.hw_version == HWVER_10200)
1840 ldev->caps.pad_max_freq_hz = 65000000;
1841 ldev->caps.nb_irq = 2;
1842 ldev->caps.ycbcr_input = false;
1843 ldev->caps.ycbcr_output = false;
1844 ldev->caps.plane_reg_shadow = false;
1845 ldev->caps.crc = false;
1846 ldev->caps.dynamic_zorder = false;
1847 ldev->caps.plane_rotation = false;
1848 ldev->caps.fifo_threshold = false;
1849 break;
1850 case HWVER_20101:
1851 ldev->caps.layer_ofs = LAY_OFS_0;
1852 ldev->caps.layer_regs = ltdc_layer_regs_a1;
1853 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
1854 ldev->caps.pix_fmt_drm = ltdc_drm_fmt_a1;
1855 ldev->caps.pix_fmt_nb = ARRAY_SIZE(ltdc_drm_fmt_a1);
1856 ldev->caps.pix_fmt_flex = false;
1857 ldev->caps.non_alpha_only_l1 = false;
1858 ldev->caps.pad_max_freq_hz = 150000000;
1859 ldev->caps.nb_irq = 4;
1860 ldev->caps.ycbcr_input = false;
1861 ldev->caps.ycbcr_output = false;
1862 ldev->caps.plane_reg_shadow = false;
1863 ldev->caps.crc = false;
1864 ldev->caps.dynamic_zorder = false;
1865 ldev->caps.plane_rotation = false;
1866 ldev->caps.fifo_threshold = false;
1867 break;
1868 case HWVER_40100:
1869 ldev->caps.layer_ofs = LAY_OFS_1;
1870 ldev->caps.layer_regs = ltdc_layer_regs_a2;
1871 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a2;
1872 ldev->caps.pix_fmt_drm = ltdc_drm_fmt_a2;
1873 ldev->caps.pix_fmt_nb = ARRAY_SIZE(ltdc_drm_fmt_a2);
1874 ldev->caps.pix_fmt_flex = true;
1875 ldev->caps.non_alpha_only_l1 = false;
1876 ldev->caps.pad_max_freq_hz = 90000000;
1877 ldev->caps.nb_irq = 2;
1878 ldev->caps.ycbcr_input = true;
1879 ldev->caps.ycbcr_output = true;
1880 ldev->caps.plane_reg_shadow = true;
1881 ldev->caps.crc = true;
1882 ldev->caps.dynamic_zorder = true;
1883 ldev->caps.plane_rotation = true;
1884 ldev->caps.fifo_threshold = true;
1885 break;
1886 default:
1887 return -ENODEV;
1888 }
1889
1890 return 0;
1891 }
1892
ltdc_suspend(struct drm_device * ddev)1893 void ltdc_suspend(struct drm_device *ddev)
1894 {
1895 struct ltdc_device *ldev = ddev->dev_private;
1896
1897 DRM_DEBUG_DRIVER("\n");
1898 clk_disable_unprepare(ldev->pixel_clk);
1899 }
1900
ltdc_resume(struct drm_device * ddev)1901 int ltdc_resume(struct drm_device *ddev)
1902 {
1903 struct ltdc_device *ldev = ddev->dev_private;
1904 int ret;
1905
1906 DRM_DEBUG_DRIVER("\n");
1907
1908 ret = clk_prepare_enable(ldev->pixel_clk);
1909 if (ret) {
1910 DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
1911 return ret;
1912 }
1913
1914 return 0;
1915 }
1916
ltdc_load(struct drm_device * ddev)1917 int ltdc_load(struct drm_device *ddev)
1918 {
1919 struct platform_device *pdev = to_platform_device(ddev->dev);
1920 struct ltdc_device *ldev = ddev->dev_private;
1921 struct device *dev = ddev->dev;
1922 struct device_node *np = dev->of_node;
1923 struct drm_bridge *bridge;
1924 struct drm_panel *panel;
1925 struct drm_crtc *crtc;
1926 struct reset_control *rstc;
1927 struct resource *res;
1928 int irq, i, nb_endpoints;
1929 int ret = -ENODEV;
1930
1931 DRM_DEBUG_DRIVER("\n");
1932
1933 /* Get number of endpoints */
1934 nb_endpoints = of_graph_get_endpoint_count(np);
1935 if (!nb_endpoints)
1936 return -ENODEV;
1937
1938 ldev->pixel_clk = devm_clk_get(dev, "lcd");
1939 if (IS_ERR(ldev->pixel_clk)) {
1940 if (PTR_ERR(ldev->pixel_clk) != -EPROBE_DEFER)
1941 DRM_ERROR("Unable to get lcd clock\n");
1942 return PTR_ERR(ldev->pixel_clk);
1943 }
1944
1945 if (clk_prepare_enable(ldev->pixel_clk)) {
1946 DRM_ERROR("Unable to prepare pixel clock\n");
1947 return -ENODEV;
1948 }
1949
1950 /* Get endpoints if any */
1951 for (i = 0; i < nb_endpoints; i++) {
1952 ret = drm_of_find_panel_or_bridge(np, 0, i, &panel, &bridge);
1953
1954 /*
1955 * If at least one endpoint is -ENODEV, continue probing,
1956 * else if at least one endpoint returned an error
1957 * (ie -EPROBE_DEFER) then stop probing.
1958 */
1959 if (ret == -ENODEV)
1960 continue;
1961 else if (ret)
1962 goto err;
1963
1964 if (panel) {
1965 bridge = drm_panel_bridge_add_typed(panel,
1966 DRM_MODE_CONNECTOR_DPI);
1967 if (IS_ERR(bridge)) {
1968 DRM_ERROR("panel-bridge endpoint %d\n", i);
1969 ret = PTR_ERR(bridge);
1970 goto err;
1971 }
1972 }
1973
1974 if (bridge) {
1975 ret = ltdc_encoder_init(ddev, bridge);
1976 if (ret) {
1977 if (ret != -EPROBE_DEFER)
1978 DRM_ERROR("init encoder endpoint %d\n", i);
1979 goto err;
1980 }
1981 }
1982 }
1983
1984 rstc = devm_reset_control_get_exclusive(dev, NULL);
1985
1986 mutex_init(&ldev->err_lock);
1987
1988 if (!IS_ERR(rstc)) {
1989 reset_control_assert(rstc);
1990 usleep_range(10, 20);
1991 reset_control_deassert(rstc);
1992 }
1993
1994 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1995 ldev->regs = devm_ioremap_resource(dev, res);
1996 if (IS_ERR(ldev->regs)) {
1997 DRM_ERROR("Unable to get ltdc registers\n");
1998 ret = PTR_ERR(ldev->regs);
1999 goto err;
2000 }
2001
2002 ldev->regmap = devm_regmap_init_mmio(&pdev->dev, ldev->regs, &stm32_ltdc_regmap_cfg);
2003 if (IS_ERR(ldev->regmap)) {
2004 DRM_ERROR("Unable to regmap ltdc registers\n");
2005 ret = PTR_ERR(ldev->regmap);
2006 goto err;
2007 }
2008
2009 ret = ltdc_get_caps(ddev);
2010 if (ret) {
2011 DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
2012 ldev->caps.hw_version);
2013 goto err;
2014 }
2015
2016 /* Disable interrupts */
2017 if (ldev->caps.fifo_threshold)
2018 regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE | IER_RRIE | IER_FUWIE |
2019 IER_TERRIE);
2020 else
2021 regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE | IER_RRIE | IER_FUWIE |
2022 IER_TERRIE | IER_FUEIE);
2023
2024 DRM_DEBUG_DRIVER("ltdc hw version 0x%08x\n", ldev->caps.hw_version);
2025
2026 /* initialize default value for fifo underrun threshold & clear interrupt error counters */
2027 ldev->transfer_err = 0;
2028 ldev->fifo_err = 0;
2029 ldev->fifo_warn = 0;
2030 ldev->fifo_threshold = FUT_DFT;
2031
2032 for (i = 0; i < ldev->caps.nb_irq; i++) {
2033 irq = platform_get_irq(pdev, i);
2034 if (irq < 0) {
2035 ret = irq;
2036 goto err;
2037 }
2038
2039 ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
2040 ltdc_irq_thread, IRQF_ONESHOT,
2041 dev_name(dev), ddev);
2042 if (ret) {
2043 DRM_ERROR("Failed to register LTDC interrupt\n");
2044 goto err;
2045 }
2046 }
2047
2048 crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
2049 if (!crtc) {
2050 DRM_ERROR("Failed to allocate crtc\n");
2051 ret = -ENOMEM;
2052 goto err;
2053 }
2054
2055 ret = ltdc_crtc_init(ddev, crtc);
2056 if (ret) {
2057 DRM_ERROR("Failed to init crtc\n");
2058 goto err;
2059 }
2060
2061 ret = drm_vblank_init(ddev, NB_CRTC);
2062 if (ret) {
2063 DRM_ERROR("Failed calling drm_vblank_init()\n");
2064 goto err;
2065 }
2066
2067 clk_disable_unprepare(ldev->pixel_clk);
2068
2069 pinctrl_pm_select_sleep_state(ddev->dev);
2070
2071 pm_runtime_enable(ddev->dev);
2072
2073 return 0;
2074 err:
2075 for (i = 0; i < nb_endpoints; i++)
2076 drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
2077
2078 clk_disable_unprepare(ldev->pixel_clk);
2079
2080 return ret;
2081 }
2082
ltdc_unload(struct drm_device * ddev)2083 void ltdc_unload(struct drm_device *ddev)
2084 {
2085 struct device *dev = ddev->dev;
2086 int nb_endpoints, i;
2087
2088 DRM_DEBUG_DRIVER("\n");
2089
2090 nb_endpoints = of_graph_get_endpoint_count(dev->of_node);
2091
2092 for (i = 0; i < nb_endpoints; i++)
2093 drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
2094
2095 pm_runtime_disable(ddev->dev);
2096 }
2097
2098 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
2099 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
2100 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
2101 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
2102 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
2103 MODULE_LICENSE("GPL v2");
2104