1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2015 Free Electrons
4 * Copyright (C) 2015 NextThing Co
5 *
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 */
8
9 #include <linux/component.h>
10 #include <linux/ioport.h>
11 #include <linux/media-bus-format.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/reset.h>
18
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_bridge.h>
21 #include <drm/drm_connector.h>
22 #include <drm/drm_crtc.h>
23 #include <drm/drm_encoder.h>
24 #include <drm/drm_modes.h>
25 #include <drm/drm_of.h>
26 #include <drm/drm_panel.h>
27 #include <drm/drm_print.h>
28 #include <drm/drm_probe_helper.h>
29 #include <drm/drm_vblank.h>
30
31 #include <uapi/drm/drm_mode.h>
32
33 #include "sun4i_crtc.h"
34 #include "sun4i_drv.h"
35 #include "sun4i_lvds.h"
36 #include "sun4i_rgb.h"
37 #include "sun4i_tcon.h"
38 #include "sun6i_mipi_dsi.h"
39 #include "sun4i_tcon_dclk.h"
40 #include "sun8i_tcon_top.h"
41 #include "sunxi_engine.h"
42
sun4i_tcon_get_connector(const struct drm_encoder * encoder)43 static struct drm_connector *sun4i_tcon_get_connector(const struct drm_encoder *encoder)
44 {
45 struct drm_connector *connector;
46 struct drm_connector_list_iter iter;
47
48 drm_connector_list_iter_begin(encoder->dev, &iter);
49 drm_for_each_connector_iter(connector, &iter)
50 if (connector->encoder == encoder) {
51 drm_connector_list_iter_end(&iter);
52 return connector;
53 }
54 drm_connector_list_iter_end(&iter);
55
56 return NULL;
57 }
58
sun4i_tcon_get_pixel_depth(const struct drm_encoder * encoder)59 static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder)
60 {
61 struct drm_connector *connector;
62 struct drm_display_info *info;
63
64 connector = sun4i_tcon_get_connector(encoder);
65 if (!connector)
66 return -EINVAL;
67
68 info = &connector->display_info;
69 if (info->num_bus_formats != 1)
70 return -EINVAL;
71
72 switch (info->bus_formats[0]) {
73 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
74 return 18;
75
76 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
77 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
78 return 24;
79 }
80
81 return -EINVAL;
82 }
83
sun4i_tcon_channel_set_status(struct sun4i_tcon * tcon,int channel,bool enabled)84 static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel,
85 bool enabled)
86 {
87 struct clk *clk;
88
89 switch (channel) {
90 case 0:
91 WARN_ON(!tcon->quirks->has_channel_0);
92 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
93 SUN4I_TCON0_CTL_TCON_ENABLE,
94 enabled ? SUN4I_TCON0_CTL_TCON_ENABLE : 0);
95 clk = tcon->dclk;
96 break;
97 case 1:
98 WARN_ON(!tcon->quirks->has_channel_1);
99 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
100 SUN4I_TCON1_CTL_TCON_ENABLE,
101 enabled ? SUN4I_TCON1_CTL_TCON_ENABLE : 0);
102 clk = tcon->sclk1;
103 break;
104 default:
105 DRM_WARN("Unknown channel... doing nothing\n");
106 return;
107 }
108
109 if (enabled) {
110 clk_prepare_enable(clk);
111 clk_rate_exclusive_get(clk);
112 } else {
113 clk_rate_exclusive_put(clk);
114 clk_disable_unprepare(clk);
115 }
116 }
117
sun4i_tcon_setup_lvds_phy(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)118 static void sun4i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
119 const struct drm_encoder *encoder)
120 {
121 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
122 SUN4I_TCON0_LVDS_ANA0_CK_EN |
123 SUN4I_TCON0_LVDS_ANA0_REG_V |
124 SUN4I_TCON0_LVDS_ANA0_REG_C |
125 SUN4I_TCON0_LVDS_ANA0_EN_MB |
126 SUN4I_TCON0_LVDS_ANA0_PD |
127 SUN4I_TCON0_LVDS_ANA0_DCHS);
128
129 udelay(2); /* delay at least 1200 ns */
130 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
131 SUN4I_TCON0_LVDS_ANA1_INIT,
132 SUN4I_TCON0_LVDS_ANA1_INIT);
133 udelay(1); /* delay at least 120 ns */
134 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
135 SUN4I_TCON0_LVDS_ANA1_UPDATE,
136 SUN4I_TCON0_LVDS_ANA1_UPDATE);
137 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
138 SUN4I_TCON0_LVDS_ANA0_EN_MB,
139 SUN4I_TCON0_LVDS_ANA0_EN_MB);
140 }
141
sun6i_tcon_setup_lvds_phy(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)142 static void sun6i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
143 const struct drm_encoder *encoder)
144 {
145 u8 val;
146
147 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
148 SUN6I_TCON0_LVDS_ANA0_C(2) |
149 SUN6I_TCON0_LVDS_ANA0_V(3) |
150 SUN6I_TCON0_LVDS_ANA0_PD(2) |
151 SUN6I_TCON0_LVDS_ANA0_EN_LDO);
152 udelay(2);
153
154 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
155 SUN6I_TCON0_LVDS_ANA0_EN_MB,
156 SUN6I_TCON0_LVDS_ANA0_EN_MB);
157 udelay(2);
158
159 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
160 SUN6I_TCON0_LVDS_ANA0_EN_DRVC,
161 SUN6I_TCON0_LVDS_ANA0_EN_DRVC);
162
163 if (sun4i_tcon_get_pixel_depth(encoder) == 18)
164 val = 7;
165 else
166 val = 0xf;
167
168 regmap_write_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
169 SUN6I_TCON0_LVDS_ANA0_EN_DRVD(0xf),
170 SUN6I_TCON0_LVDS_ANA0_EN_DRVD(val));
171 }
172
sun4i_tcon_lvds_set_status(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,bool enabled)173 static void sun4i_tcon_lvds_set_status(struct sun4i_tcon *tcon,
174 const struct drm_encoder *encoder,
175 bool enabled)
176 {
177 if (enabled) {
178 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG,
179 SUN4I_TCON0_LVDS_IF_EN,
180 SUN4I_TCON0_LVDS_IF_EN);
181 if (tcon->quirks->setup_lvds_phy)
182 tcon->quirks->setup_lvds_phy(tcon, encoder);
183 } else {
184 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG,
185 SUN4I_TCON0_LVDS_IF_EN, 0);
186 }
187 }
188
sun4i_tcon_set_status(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,bool enabled)189 void sun4i_tcon_set_status(struct sun4i_tcon *tcon,
190 const struct drm_encoder *encoder,
191 bool enabled)
192 {
193 bool is_lvds = false;
194 int channel;
195
196 switch (encoder->encoder_type) {
197 case DRM_MODE_ENCODER_LVDS:
198 is_lvds = true;
199 fallthrough;
200 case DRM_MODE_ENCODER_DSI:
201 case DRM_MODE_ENCODER_NONE:
202 channel = 0;
203 break;
204 case DRM_MODE_ENCODER_TMDS:
205 case DRM_MODE_ENCODER_TVDAC:
206 channel = 1;
207 break;
208 default:
209 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
210 return;
211 }
212
213 if (is_lvds && !enabled)
214 sun4i_tcon_lvds_set_status(tcon, encoder, false);
215
216 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
217 SUN4I_TCON_GCTL_TCON_ENABLE,
218 enabled ? SUN4I_TCON_GCTL_TCON_ENABLE : 0);
219
220 if (is_lvds && enabled)
221 sun4i_tcon_lvds_set_status(tcon, encoder, true);
222
223 sun4i_tcon_channel_set_status(tcon, channel, enabled);
224 }
225
sun4i_tcon_enable_vblank(struct sun4i_tcon * tcon,bool enable)226 void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
227 {
228 u32 mask, val = 0;
229
230 DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable ? "En" : "Dis");
231
232 mask = SUN4I_TCON_GINT0_VBLANK_ENABLE(0) |
233 SUN4I_TCON_GINT0_VBLANK_ENABLE(1) |
234 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_ENABLE;
235
236 if (enable)
237 val = mask;
238
239 regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG, mask, val);
240 }
241 EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
242
243 /*
244 * This function is a helper for TCON output muxing. The TCON output
245 * muxing control register in earlier SoCs (without the TCON TOP block)
246 * are located in TCON0. This helper returns a pointer to TCON0's
247 * sun4i_tcon structure, or NULL if not found.
248 */
sun4i_get_tcon0(struct drm_device * drm)249 static struct sun4i_tcon *sun4i_get_tcon0(struct drm_device *drm)
250 {
251 struct sun4i_drv *drv = drm->dev_private;
252 struct sun4i_tcon *tcon;
253
254 list_for_each_entry(tcon, &drv->tcon_list, list)
255 if (tcon->id == 0)
256 return tcon;
257
258 dev_warn(drm->dev,
259 "TCON0 not found, display output muxing may not work\n");
260
261 return NULL;
262 }
263
sun4i_tcon_set_mux(struct sun4i_tcon * tcon,int channel,const struct drm_encoder * encoder)264 static void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
265 const struct drm_encoder *encoder)
266 {
267 int ret = -ENOTSUPP;
268
269 if (tcon->quirks->set_mux)
270 ret = tcon->quirks->set_mux(tcon, encoder);
271
272 DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
273 encoder->name, encoder->crtc->name, ret);
274 }
275
sun4i_tcon_get_clk_delay(const struct drm_display_mode * mode,int channel)276 static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode,
277 int channel)
278 {
279 int delay = mode->vtotal - mode->vdisplay;
280
281 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
282 delay /= 2;
283
284 if (channel == 1)
285 delay -= 2;
286
287 delay = min(delay, 30);
288
289 DRM_DEBUG_DRIVER("TCON %d clock delay %u\n", channel, delay);
290
291 return delay;
292 }
293
sun4i_tcon0_mode_set_dithering(struct sun4i_tcon * tcon,const struct drm_connector * connector)294 static void sun4i_tcon0_mode_set_dithering(struct sun4i_tcon *tcon,
295 const struct drm_connector *connector)
296 {
297 u32 bus_format = 0;
298 u32 val = 0;
299
300 /* XXX Would this ever happen? */
301 if (!connector)
302 return;
303
304 /*
305 * FIXME: Undocumented bits
306 *
307 * The whole dithering process and these parameters are not
308 * explained in the vendor documents or BSP kernel code.
309 */
310 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PR_REG, 0x11111111);
311 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PG_REG, 0x11111111);
312 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PB_REG, 0x11111111);
313 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LR_REG, 0x11111111);
314 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LG_REG, 0x11111111);
315 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LB_REG, 0x11111111);
316 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL0_REG, 0x01010000);
317 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL1_REG, 0x15151111);
318 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL2_REG, 0x57575555);
319 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL3_REG, 0x7f7f7777);
320
321 /* Do dithering if panel only supports 6 bits per color */
322 if (connector->display_info.bpc == 6)
323 val |= SUN4I_TCON0_FRM_CTL_EN;
324
325 if (connector->display_info.num_bus_formats == 1)
326 bus_format = connector->display_info.bus_formats[0];
327
328 /* Check the connection format */
329 switch (bus_format) {
330 case MEDIA_BUS_FMT_RGB565_1X16:
331 /* R and B components are only 5 bits deep */
332 val |= SUN4I_TCON0_FRM_CTL_MODE_R;
333 val |= SUN4I_TCON0_FRM_CTL_MODE_B;
334 fallthrough;
335 case MEDIA_BUS_FMT_RGB666_1X18:
336 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
337 /* Fall through: enable dithering */
338 val |= SUN4I_TCON0_FRM_CTL_EN;
339 break;
340 }
341
342 /* Write dithering settings */
343 regmap_write(tcon->regs, SUN4I_TCON_FRM_CTL_REG, val);
344 }
345
sun4i_tcon0_mode_set_cpu(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,const struct drm_display_mode * mode)346 static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon,
347 const struct drm_encoder *encoder,
348 const struct drm_display_mode *mode)
349 {
350 /* TODO support normal CPU interface modes */
351 struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
352 struct mipi_dsi_device *device = dsi->device;
353 u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format);
354 u8 lanes = device->lanes;
355 u32 block_space, start_delay;
356 u32 tcon_div;
357
358 /*
359 * dclk is required to run at 1/4 the DSI per-lane bit rate.
360 */
361 tcon->dclk_min_div = SUN6I_DSI_TCON_DIV;
362 tcon->dclk_max_div = SUN6I_DSI_TCON_DIV;
363 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000 * (bpp / lanes)
364 / SUN6I_DSI_TCON_DIV);
365
366 /* Set the resolution */
367 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
368 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) |
369 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay));
370
371 /* Set dithering if needed */
372 sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder));
373
374 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
375 SUN4I_TCON0_CTL_IF_MASK,
376 SUN4I_TCON0_CTL_IF_8080);
377
378 regmap_write(tcon->regs, SUN4I_TCON_ECC_FIFO_REG,
379 SUN4I_TCON_ECC_FIFO_EN);
380
381 regmap_write(tcon->regs, SUN4I_TCON0_CPU_IF_REG,
382 SUN4I_TCON0_CPU_IF_MODE_DSI |
383 SUN4I_TCON0_CPU_IF_TRI_FIFO_FLUSH |
384 SUN4I_TCON0_CPU_IF_TRI_FIFO_EN |
385 SUN4I_TCON0_CPU_IF_TRI_EN);
386
387 /*
388 * This looks suspicious, but it works...
389 *
390 * The datasheet says that this should be set higher than 20 *
391 * pixel cycle, but it's not clear what a pixel cycle is.
392 */
393 regmap_read(tcon->regs, SUN4I_TCON0_DCLK_REG, &tcon_div);
394 tcon_div &= GENMASK(6, 0);
395 block_space = mode->htotal * bpp / (tcon_div * lanes);
396 block_space -= mode->hdisplay + 40;
397
398 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI0_REG,
399 SUN4I_TCON0_CPU_TRI0_BLOCK_SPACE(block_space) |
400 SUN4I_TCON0_CPU_TRI0_BLOCK_SIZE(mode->hdisplay));
401
402 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI1_REG,
403 SUN4I_TCON0_CPU_TRI1_BLOCK_NUM(mode->vdisplay));
404
405 start_delay = (mode->crtc_vtotal - mode->crtc_vdisplay - 10 - 1);
406 start_delay = start_delay * mode->crtc_htotal * 149;
407 start_delay = start_delay / (mode->crtc_clock / 1000) / 8;
408 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI2_REG,
409 SUN4I_TCON0_CPU_TRI2_TRANS_START_SET(10) |
410 SUN4I_TCON0_CPU_TRI2_START_DELAY(start_delay));
411
412 /*
413 * The Allwinner BSP has a comment that the period should be
414 * the display clock * 15, but uses an hardcoded 3000...
415 */
416 regmap_write(tcon->regs, SUN4I_TCON_SAFE_PERIOD_REG,
417 SUN4I_TCON_SAFE_PERIOD_NUM(3000) |
418 SUN4I_TCON_SAFE_PERIOD_MODE(3));
419
420 /* Enable the output on the pins */
421 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG,
422 0xe0000000);
423 }
424
sun4i_tcon0_mode_set_lvds(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,const struct drm_display_mode * mode)425 static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
426 const struct drm_encoder *encoder,
427 const struct drm_display_mode *mode)
428 {
429 unsigned int bp;
430 u8 clk_delay;
431 u32 reg, val = 0;
432
433 WARN_ON(!tcon->quirks->has_channel_0);
434
435 tcon->dclk_min_div = 7;
436 tcon->dclk_max_div = 7;
437 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
438
439 /* Set the resolution */
440 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
441 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) |
442 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay));
443
444 /* Set dithering if needed */
445 sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder));
446
447 /* Adjust clock delay */
448 clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
449 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
450 SUN4I_TCON0_CTL_CLK_DELAY_MASK,
451 SUN4I_TCON0_CTL_CLK_DELAY(clk_delay));
452
453 /*
454 * This is called a backporch in the register documentation,
455 * but it really is the back porch + hsync
456 */
457 bp = mode->crtc_htotal - mode->crtc_hsync_start;
458 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
459 mode->crtc_htotal, bp);
460
461 /* Set horizontal display timings */
462 regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG,
463 SUN4I_TCON0_BASIC1_H_TOTAL(mode->htotal) |
464 SUN4I_TCON0_BASIC1_H_BACKPORCH(bp));
465
466 /*
467 * This is called a backporch in the register documentation,
468 * but it really is the back porch + hsync
469 */
470 bp = mode->crtc_vtotal - mode->crtc_vsync_start;
471 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
472 mode->crtc_vtotal, bp);
473
474 /* Set vertical display timings */
475 regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG,
476 SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
477 SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
478
479 reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0;
480 if (sun4i_tcon_get_pixel_depth(encoder) == 24)
481 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_24BITS;
482 else
483 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_18BITS;
484
485 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_IF_REG, reg);
486
487 /* Setup the polarity of the various signals */
488 if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
489 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
490
491 if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
492 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
493
494 regmap_write(tcon->regs, SUN4I_TCON0_IO_POL_REG, val);
495
496 /* Map output pins to channel 0 */
497 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
498 SUN4I_TCON_GCTL_IOMAP_MASK,
499 SUN4I_TCON_GCTL_IOMAP_TCON0);
500
501 /* Enable the output on the pins */
502 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0xe0000000);
503 }
504
sun4i_tcon0_mode_set_rgb(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,const struct drm_display_mode * mode)505 static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
506 const struct drm_encoder *encoder,
507 const struct drm_display_mode *mode)
508 {
509 struct drm_connector *connector = sun4i_tcon_get_connector(encoder);
510 const struct drm_display_info *info = &connector->display_info;
511 unsigned int bp, hsync, vsync;
512 u8 clk_delay;
513 u32 val = 0;
514
515 WARN_ON(!tcon->quirks->has_channel_0);
516
517 tcon->dclk_min_div = tcon->quirks->dclk_min_div;
518 tcon->dclk_max_div = 127;
519 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
520
521 /* Set the resolution */
522 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
523 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) |
524 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay));
525
526 /* Set dithering if needed */
527 sun4i_tcon0_mode_set_dithering(tcon, connector);
528
529 /* Adjust clock delay */
530 clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
531 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
532 SUN4I_TCON0_CTL_CLK_DELAY_MASK,
533 SUN4I_TCON0_CTL_CLK_DELAY(clk_delay));
534
535 /*
536 * This is called a backporch in the register documentation,
537 * but it really is the back porch + hsync
538 */
539 bp = mode->crtc_htotal - mode->crtc_hsync_start;
540 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
541 mode->crtc_htotal, bp);
542
543 /* Set horizontal display timings */
544 regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG,
545 SUN4I_TCON0_BASIC1_H_TOTAL(mode->crtc_htotal) |
546 SUN4I_TCON0_BASIC1_H_BACKPORCH(bp));
547
548 /*
549 * This is called a backporch in the register documentation,
550 * but it really is the back porch + hsync
551 */
552 bp = mode->crtc_vtotal - mode->crtc_vsync_start;
553 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
554 mode->crtc_vtotal, bp);
555
556 /* Set vertical display timings */
557 regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG,
558 SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
559 SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
560
561 /* Set Hsync and Vsync length */
562 hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
563 vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
564 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
565 regmap_write(tcon->regs, SUN4I_TCON0_BASIC3_REG,
566 SUN4I_TCON0_BASIC3_V_SYNC(vsync) |
567 SUN4I_TCON0_BASIC3_H_SYNC(hsync));
568
569 /* Setup the polarity of the various signals */
570 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
571 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
572
573 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
574 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
575
576 if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
577 val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE;
578
579 if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
580 val |= SUN4I_TCON0_IO_POL_DCLK_DRIVE_NEGEDGE;
581
582 regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
583 SUN4I_TCON0_IO_POL_HSYNC_POSITIVE |
584 SUN4I_TCON0_IO_POL_VSYNC_POSITIVE |
585 SUN4I_TCON0_IO_POL_DCLK_DRIVE_NEGEDGE |
586 SUN4I_TCON0_IO_POL_DE_NEGATIVE,
587 val);
588
589 /* Map output pins to channel 0 */
590 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
591 SUN4I_TCON_GCTL_IOMAP_MASK,
592 SUN4I_TCON_GCTL_IOMAP_TCON0);
593
594 /* Enable the output on the pins */
595 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0);
596 }
597
sun4i_tcon1_mode_set(struct sun4i_tcon * tcon,const struct drm_display_mode * mode)598 static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
599 const struct drm_display_mode *mode)
600 {
601 unsigned int bp, hsync, vsync, vtotal;
602 u8 clk_delay;
603 u32 val;
604
605 WARN_ON(!tcon->quirks->has_channel_1);
606
607 /* Configure the dot clock */
608 clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
609
610 /* Adjust clock delay */
611 clk_delay = sun4i_tcon_get_clk_delay(mode, 1);
612 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
613 SUN4I_TCON1_CTL_CLK_DELAY_MASK,
614 SUN4I_TCON1_CTL_CLK_DELAY(clk_delay));
615
616 /* Set interlaced mode */
617 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
618 val = SUN4I_TCON1_CTL_INTERLACE_ENABLE;
619 else
620 val = 0;
621 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
622 SUN4I_TCON1_CTL_INTERLACE_ENABLE,
623 val);
624
625 /* Set the input resolution */
626 regmap_write(tcon->regs, SUN4I_TCON1_BASIC0_REG,
627 SUN4I_TCON1_BASIC0_X(mode->crtc_hdisplay) |
628 SUN4I_TCON1_BASIC0_Y(mode->crtc_vdisplay));
629
630 /* Set the upscaling resolution */
631 regmap_write(tcon->regs, SUN4I_TCON1_BASIC1_REG,
632 SUN4I_TCON1_BASIC1_X(mode->crtc_hdisplay) |
633 SUN4I_TCON1_BASIC1_Y(mode->crtc_vdisplay));
634
635 /* Set the output resolution */
636 regmap_write(tcon->regs, SUN4I_TCON1_BASIC2_REG,
637 SUN4I_TCON1_BASIC2_X(mode->crtc_hdisplay) |
638 SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay));
639
640 /* Set horizontal display timings */
641 bp = mode->crtc_htotal - mode->crtc_hsync_start;
642 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
643 mode->htotal, bp);
644 regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG,
645 SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) |
646 SUN4I_TCON1_BASIC3_H_BACKPORCH(bp));
647
648 bp = mode->crtc_vtotal - mode->crtc_vsync_start;
649 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
650 mode->crtc_vtotal, bp);
651
652 /*
653 * The vertical resolution needs to be doubled in all
654 * cases. We could use crtc_vtotal and always multiply by two,
655 * but that leads to a rounding error in interlace when vtotal
656 * is odd.
657 *
658 * This happens with TV's PAL for example, where vtotal will
659 * be 625, crtc_vtotal 312, and thus crtc_vtotal * 2 will be
660 * 624, which apparently confuses the hardware.
661 *
662 * To work around this, we will always use vtotal, and
663 * multiply by two only if we're not in interlace.
664 */
665 vtotal = mode->vtotal;
666 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
667 vtotal = vtotal * 2;
668
669 /* Set vertical display timings */
670 regmap_write(tcon->regs, SUN4I_TCON1_BASIC4_REG,
671 SUN4I_TCON1_BASIC4_V_TOTAL(vtotal) |
672 SUN4I_TCON1_BASIC4_V_BACKPORCH(bp));
673
674 /* Set Hsync and Vsync length */
675 hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
676 vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
677 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
678 regmap_write(tcon->regs, SUN4I_TCON1_BASIC5_REG,
679 SUN4I_TCON1_BASIC5_V_SYNC(vsync) |
680 SUN4I_TCON1_BASIC5_H_SYNC(hsync));
681
682 /* Setup the polarity of multiple signals */
683 if (tcon->quirks->polarity_in_ch0) {
684 val = 0;
685
686 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
687 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
688
689 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
690 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
691
692 regmap_write(tcon->regs, SUN4I_TCON0_IO_POL_REG, val);
693 } else {
694 /* according to vendor driver, this bit must be always set */
695 val = SUN4I_TCON1_IO_POL_UNKNOWN;
696
697 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
698 val |= SUN4I_TCON1_IO_POL_HSYNC_POSITIVE;
699
700 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
701 val |= SUN4I_TCON1_IO_POL_VSYNC_POSITIVE;
702
703 regmap_write(tcon->regs, SUN4I_TCON1_IO_POL_REG, val);
704 }
705
706 /* Map output pins to channel 1 */
707 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
708 SUN4I_TCON_GCTL_IOMAP_MASK,
709 SUN4I_TCON_GCTL_IOMAP_TCON1);
710 }
711
sun4i_tcon_mode_set(struct sun4i_tcon * tcon,const struct drm_encoder * encoder,const struct drm_display_mode * mode)712 void sun4i_tcon_mode_set(struct sun4i_tcon *tcon,
713 const struct drm_encoder *encoder,
714 const struct drm_display_mode *mode)
715 {
716 switch (encoder->encoder_type) {
717 case DRM_MODE_ENCODER_DSI:
718 /* DSI is tied to special case of CPU interface */
719 sun4i_tcon0_mode_set_cpu(tcon, encoder, mode);
720 break;
721 case DRM_MODE_ENCODER_LVDS:
722 sun4i_tcon0_mode_set_lvds(tcon, encoder, mode);
723 break;
724 case DRM_MODE_ENCODER_NONE:
725 sun4i_tcon0_mode_set_rgb(tcon, encoder, mode);
726 sun4i_tcon_set_mux(tcon, 0, encoder);
727 break;
728 case DRM_MODE_ENCODER_TVDAC:
729 case DRM_MODE_ENCODER_TMDS:
730 sun4i_tcon1_mode_set(tcon, mode);
731 sun4i_tcon_set_mux(tcon, 1, encoder);
732 break;
733 default:
734 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
735 }
736 }
737 EXPORT_SYMBOL(sun4i_tcon_mode_set);
738
sun4i_tcon_finish_page_flip(struct drm_device * dev,struct sun4i_crtc * scrtc)739 static void sun4i_tcon_finish_page_flip(struct drm_device *dev,
740 struct sun4i_crtc *scrtc)
741 {
742 unsigned long flags;
743
744 spin_lock_irqsave(&dev->event_lock, flags);
745 if (scrtc->event) {
746 drm_crtc_send_vblank_event(&scrtc->crtc, scrtc->event);
747 drm_crtc_vblank_put(&scrtc->crtc);
748 scrtc->event = NULL;
749 }
750 spin_unlock_irqrestore(&dev->event_lock, flags);
751 }
752
sun4i_tcon_handler(int irq,void * private)753 static irqreturn_t sun4i_tcon_handler(int irq, void *private)
754 {
755 struct sun4i_tcon *tcon = private;
756 struct drm_device *drm = tcon->drm;
757 struct sun4i_crtc *scrtc = tcon->crtc;
758 struct sunxi_engine *engine = scrtc->engine;
759 unsigned int status;
760
761 regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status);
762
763 if (!(status & (SUN4I_TCON_GINT0_VBLANK_INT(0) |
764 SUN4I_TCON_GINT0_VBLANK_INT(1) |
765 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT)))
766 return IRQ_NONE;
767
768 drm_crtc_handle_vblank(&scrtc->crtc);
769 sun4i_tcon_finish_page_flip(drm, scrtc);
770
771 /* Acknowledge the interrupt */
772 regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG,
773 SUN4I_TCON_GINT0_VBLANK_INT(0) |
774 SUN4I_TCON_GINT0_VBLANK_INT(1) |
775 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT,
776 0);
777
778 if (engine->ops->vblank_quirk)
779 engine->ops->vblank_quirk(engine);
780
781 return IRQ_HANDLED;
782 }
783
sun4i_tcon_init_clocks(struct device * dev,struct sun4i_tcon * tcon)784 static int sun4i_tcon_init_clocks(struct device *dev,
785 struct sun4i_tcon *tcon)
786 {
787 tcon->clk = devm_clk_get_enabled(dev, "ahb");
788 if (IS_ERR(tcon->clk)) {
789 dev_err(dev, "Couldn't get the TCON bus clock\n");
790 return PTR_ERR(tcon->clk);
791 }
792
793 if (tcon->quirks->has_channel_0) {
794 tcon->sclk0 = devm_clk_get_enabled(dev, "tcon-ch0");
795 if (IS_ERR(tcon->sclk0)) {
796 dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
797 return PTR_ERR(tcon->sclk0);
798 }
799 }
800
801 if (tcon->quirks->has_channel_1) {
802 tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
803 if (IS_ERR(tcon->sclk1)) {
804 dev_err(dev, "Couldn't get the TCON channel 1 clock\n");
805 return PTR_ERR(tcon->sclk1);
806 }
807 }
808
809 return 0;
810 }
811
sun4i_tcon_init_irq(struct device * dev,struct sun4i_tcon * tcon)812 static int sun4i_tcon_init_irq(struct device *dev,
813 struct sun4i_tcon *tcon)
814 {
815 struct platform_device *pdev = to_platform_device(dev);
816 int irq, ret;
817
818 irq = platform_get_irq(pdev, 0);
819 if (irq < 0)
820 return irq;
821
822 ret = devm_request_irq(dev, irq, sun4i_tcon_handler, 0,
823 dev_name(dev), tcon);
824 if (ret) {
825 dev_err(dev, "Couldn't request the IRQ\n");
826 return ret;
827 }
828
829 return 0;
830 }
831
832 static const struct regmap_config sun4i_tcon_regmap_config = {
833 .reg_bits = 32,
834 .val_bits = 32,
835 .reg_stride = 4,
836 .max_register = 0x800,
837 };
838
sun4i_tcon_init_regmap(struct device * dev,struct sun4i_tcon * tcon)839 static int sun4i_tcon_init_regmap(struct device *dev,
840 struct sun4i_tcon *tcon)
841 {
842 struct platform_device *pdev = to_platform_device(dev);
843 void __iomem *regs;
844
845 regs = devm_platform_ioremap_resource(pdev, 0);
846 if (IS_ERR(regs))
847 return PTR_ERR(regs);
848
849 tcon->regs = devm_regmap_init_mmio(dev, regs,
850 &sun4i_tcon_regmap_config);
851 if (IS_ERR(tcon->regs)) {
852 dev_err(dev, "Couldn't create the TCON regmap\n");
853 return PTR_ERR(tcon->regs);
854 }
855
856 /* Make sure the TCON is disabled and all IRQs are off */
857 regmap_write(tcon->regs, SUN4I_TCON_GCTL_REG, 0);
858 regmap_write(tcon->regs, SUN4I_TCON_GINT0_REG, 0);
859 regmap_write(tcon->regs, SUN4I_TCON_GINT1_REG, 0);
860
861 /* Disable IO lines and set them to tristate */
862 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, ~0);
863 regmap_write(tcon->regs, SUN4I_TCON1_IO_TRI_REG, ~0);
864
865 return 0;
866 }
867
868 /*
869 * On SoCs with the old display pipeline design (Display Engine 1.0),
870 * the TCON is always tied to just one backend. Hence we can traverse
871 * the of_graph upwards to find the backend our tcon is connected to,
872 * and take its ID as our own.
873 *
874 * We can either identify backends from their compatible strings, which
875 * means maintaining a large list of them. Or, since the backend is
876 * registered and binded before the TCON, we can just go through the
877 * list of registered backends and compare the device node.
878 *
879 * As the structures now store engines instead of backends, here this
880 * function in fact searches the corresponding engine, and the ID is
881 * requested via the get_id function of the engine.
882 */
883 static struct sunxi_engine *
sun4i_tcon_find_engine_traverse(struct sun4i_drv * drv,struct device_node * node,u32 port_id)884 sun4i_tcon_find_engine_traverse(struct sun4i_drv *drv,
885 struct device_node *node,
886 u32 port_id)
887 {
888 struct device_node *port, *ep, *remote;
889 struct sunxi_engine *engine = ERR_PTR(-EINVAL);
890 u32 reg = 0;
891
892 port = of_graph_get_port_by_id(node, port_id);
893 if (!port)
894 return ERR_PTR(-EINVAL);
895
896 /*
897 * This only works if there is only one path from the TCON
898 * to any display engine. Otherwise the probe order of the
899 * TCONs and display engines is not guaranteed. They may
900 * either bind to the wrong one, or worse, bind to the same
901 * one if additional checks are not done.
902 *
903 * Bail out if there are multiple input connections.
904 */
905 if (of_get_available_child_count(port) != 1)
906 goto out_put_port;
907
908 /* Get the first connection without specifying an ID */
909 ep = of_get_next_available_child(port, NULL);
910 if (!ep)
911 goto out_put_port;
912
913 remote = of_graph_get_remote_port_parent(ep);
914 if (!remote)
915 goto out_put_ep;
916
917 /* does this node match any registered engines? */
918 list_for_each_entry(engine, &drv->engine_list, list)
919 if (remote == engine->node)
920 goto out_put_remote;
921
922 /*
923 * According to device tree binding input ports have even id
924 * number and output ports have odd id. Since component with
925 * more than one input and one output (TCON TOP) exits, correct
926 * remote input id has to be calculated by subtracting 1 from
927 * remote output id. If this for some reason can't be done, 0
928 * is used as input port id.
929 */
930 of_node_put(port);
931 port = of_graph_get_remote_port(ep);
932 if (!of_property_read_u32(port, "reg", ®) && reg > 0)
933 reg -= 1;
934
935 /* keep looking through upstream ports */
936 engine = sun4i_tcon_find_engine_traverse(drv, remote, reg);
937
938 out_put_remote:
939 of_node_put(remote);
940 out_put_ep:
941 of_node_put(ep);
942 out_put_port:
943 of_node_put(port);
944
945 return engine;
946 }
947
948 /*
949 * The device tree binding says that the remote endpoint ID of any
950 * connection between components, up to and including the TCON, of
951 * the display pipeline should be equal to the actual ID of the local
952 * component. Thus we can look at any one of the input connections of
953 * the TCONs, and use that connection's remote endpoint ID as our own.
954 *
955 * Since the user of this function already finds the input port,
956 * the port is passed in directly without further checks.
957 */
sun4i_tcon_of_get_id_from_port(struct device_node * port)958 static int sun4i_tcon_of_get_id_from_port(struct device_node *port)
959 {
960 struct device_node *ep;
961 int ret = -EINVAL;
962
963 /* try finding an upstream endpoint */
964 for_each_available_child_of_node(port, ep) {
965 struct device_node *remote;
966 u32 reg;
967
968 remote = of_graph_get_remote_endpoint(ep);
969 if (!remote)
970 continue;
971
972 ret = of_property_read_u32(remote, "reg", ®);
973 if (ret)
974 continue;
975
976 ret = reg;
977 }
978
979 return ret;
980 }
981
982 /*
983 * Once we know the TCON's id, we can look through the list of
984 * engines to find a matching one. We assume all engines have
985 * been probed and added to the list.
986 */
sun4i_tcon_get_engine_by_id(struct sun4i_drv * drv,int id)987 static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv,
988 int id)
989 {
990 struct sunxi_engine *engine;
991
992 list_for_each_entry(engine, &drv->engine_list, list)
993 if (engine->id == id)
994 return engine;
995
996 return ERR_PTR(-EINVAL);
997 }
998
sun4i_tcon_connected_to_tcon_top(struct device_node * node)999 static bool sun4i_tcon_connected_to_tcon_top(struct device_node *node)
1000 {
1001 struct device_node *remote;
1002 bool ret = false;
1003
1004 remote = of_graph_get_remote_node(node, 0, -1);
1005 if (remote) {
1006 ret = !!(IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
1007 of_match_node(sun8i_tcon_top_of_table, remote));
1008 of_node_put(remote);
1009 }
1010
1011 return ret;
1012 }
1013
sun4i_tcon_get_index(struct sun4i_drv * drv)1014 static int sun4i_tcon_get_index(struct sun4i_drv *drv)
1015 {
1016 struct list_head *pos;
1017 int size = 0;
1018
1019 /*
1020 * Because TCON is added to the list at the end of the probe
1021 * (after this function is called), index of the current TCON
1022 * will be same as current TCON list size.
1023 */
1024 list_for_each(pos, &drv->tcon_list)
1025 ++size;
1026
1027 return size;
1028 }
1029
1030 /*
1031 * On SoCs with the old display pipeline design (Display Engine 1.0),
1032 * we assumed the TCON was always tied to just one backend. However
1033 * this proved not to be the case. On the A31, the TCON can select
1034 * either backend as its source. On the A20 (and likely on the A10),
1035 * the backend can choose which TCON to output to.
1036 *
1037 * The device tree binding says that the remote endpoint ID of any
1038 * connection between components, up to and including the TCON, of
1039 * the display pipeline should be equal to the actual ID of the local
1040 * component. Thus we should be able to look at any one of the input
1041 * connections of the TCONs, and use that connection's remote endpoint
1042 * ID as our own.
1043 *
1044 * However the connections between the backend and TCON were assumed
1045 * to be always singular, and their endpoit IDs were all incorrectly
1046 * set to 0. This means for these old device trees, we cannot just look
1047 * up the remote endpoint ID of a TCON input endpoint. TCON1 would be
1048 * incorrectly identified as TCON0.
1049 *
1050 * This function first checks if the TCON node has 2 input endpoints.
1051 * If so, then the device tree is a corrected version, and it will use
1052 * sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above
1053 * to fetch the ID and engine directly. If not, then it is likely an
1054 * old device trees, where the endpoint IDs were incorrect, but did not
1055 * have endpoint connections between the backend and TCON across
1056 * different display pipelines. It will fall back to the old method of
1057 * traversing the of_graph to try and find a matching engine by device
1058 * node.
1059 *
1060 * In the case of single display pipeline device trees, either method
1061 * works.
1062 */
sun4i_tcon_find_engine(struct sun4i_drv * drv,struct device_node * node)1063 static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv,
1064 struct device_node *node)
1065 {
1066 struct device_node *port;
1067 struct sunxi_engine *engine;
1068
1069 port = of_graph_get_port_by_id(node, 0);
1070 if (!port)
1071 return ERR_PTR(-EINVAL);
1072
1073 /*
1074 * Is this a corrected device tree with cross pipeline
1075 * connections between the backend and TCON?
1076 */
1077 if (of_get_child_count(port) > 1) {
1078 int id;
1079
1080 /*
1081 * When pipeline has the same number of TCONs and engines which
1082 * are represented by frontends/backends (DE1) or mixers (DE2),
1083 * we match them by their respective IDs. However, if pipeline
1084 * contains TCON TOP, chances are that there are either more
1085 * TCONs than engines (R40) or TCONs with non-consecutive ids.
1086 * (H6). In that case it's easier just use TCON index in list
1087 * as an id. That means that on R40, any 2 TCONs can be enabled
1088 * in DT out of 4 (there are 2 mixers). Due to the design of
1089 * TCON TOP, remaining 2 TCONs can't be connected to anything
1090 * anyway.
1091 */
1092 if (sun4i_tcon_connected_to_tcon_top(node))
1093 id = sun4i_tcon_get_index(drv);
1094 else
1095 id = sun4i_tcon_of_get_id_from_port(port);
1096
1097 /* Get our engine by matching our ID */
1098 engine = sun4i_tcon_get_engine_by_id(drv, id);
1099
1100 of_node_put(port);
1101 return engine;
1102 }
1103
1104 /* Fallback to old method by traversing input endpoints */
1105 of_node_put(port);
1106 return sun4i_tcon_find_engine_traverse(drv, node, 0);
1107 }
1108
sun4i_tcon_bind(struct device * dev,struct device * master,void * data)1109 static int sun4i_tcon_bind(struct device *dev, struct device *master,
1110 void *data)
1111 {
1112 struct drm_device *drm = data;
1113 struct sun4i_drv *drv = drm->dev_private;
1114 struct sunxi_engine *engine;
1115 struct device_node *remote;
1116 struct sun4i_tcon *tcon;
1117 struct reset_control *edp_rstc;
1118 bool has_lvds_rst, has_lvds_alt, can_lvds;
1119 int ret;
1120
1121 engine = sun4i_tcon_find_engine(drv, dev->of_node);
1122 if (IS_ERR(engine)) {
1123 dev_err(dev, "Couldn't find matching engine\n");
1124 return -EPROBE_DEFER;
1125 }
1126
1127 tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
1128 if (!tcon)
1129 return -ENOMEM;
1130 dev_set_drvdata(dev, tcon);
1131 tcon->drm = drm;
1132 tcon->dev = dev;
1133 tcon->id = engine->id;
1134 tcon->quirks = of_device_get_match_data(dev);
1135
1136 tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
1137 if (IS_ERR(tcon->lcd_rst)) {
1138 dev_err(dev, "Couldn't get our reset line\n");
1139 return PTR_ERR(tcon->lcd_rst);
1140 }
1141
1142 if (tcon->quirks->needs_edp_reset) {
1143 edp_rstc = devm_reset_control_get_shared(dev, "edp");
1144 if (IS_ERR(edp_rstc)) {
1145 dev_err(dev, "Couldn't get edp reset line\n");
1146 return PTR_ERR(edp_rstc);
1147 }
1148
1149 ret = reset_control_deassert(edp_rstc);
1150 if (ret) {
1151 dev_err(dev, "Couldn't deassert edp reset line\n");
1152 return ret;
1153 }
1154 }
1155
1156 /* Make sure our TCON is reset */
1157 ret = reset_control_reset(tcon->lcd_rst);
1158 if (ret) {
1159 dev_err(dev, "Couldn't deassert our reset line\n");
1160 return ret;
1161 }
1162
1163 if (tcon->quirks->supports_lvds) {
1164 /*
1165 * This can only be made optional since we've had DT
1166 * nodes without the LVDS reset properties.
1167 *
1168 * If the property is missing, just disable LVDS, and
1169 * print a warning.
1170 */
1171 tcon->lvds_rst = devm_reset_control_get_optional(dev, "lvds");
1172 if (IS_ERR(tcon->lvds_rst)) {
1173 dev_err(dev, "Couldn't get our reset line\n");
1174 return PTR_ERR(tcon->lvds_rst);
1175 } else if (tcon->lvds_rst) {
1176 has_lvds_rst = true;
1177 reset_control_reset(tcon->lvds_rst);
1178 } else {
1179 has_lvds_rst = false;
1180 }
1181
1182 /*
1183 * This can only be made optional since we've had DT
1184 * nodes without the LVDS reset properties.
1185 *
1186 * If the property is missing, just disable LVDS, and
1187 * print a warning.
1188 */
1189 if (tcon->quirks->has_lvds_alt) {
1190 tcon->lvds_pll = devm_clk_get(dev, "lvds-alt");
1191 if (IS_ERR(tcon->lvds_pll)) {
1192 if (PTR_ERR(tcon->lvds_pll) == -ENOENT) {
1193 has_lvds_alt = false;
1194 } else {
1195 dev_err(dev, "Couldn't get the LVDS PLL\n");
1196 return PTR_ERR(tcon->lvds_pll);
1197 }
1198 } else {
1199 has_lvds_alt = true;
1200 }
1201 }
1202
1203 if (!has_lvds_rst ||
1204 (tcon->quirks->has_lvds_alt && !has_lvds_alt)) {
1205 dev_warn(dev, "Missing LVDS properties, Please upgrade your DT\n");
1206 dev_warn(dev, "LVDS output disabled\n");
1207 can_lvds = false;
1208 } else {
1209 can_lvds = true;
1210 }
1211 } else {
1212 can_lvds = false;
1213 }
1214
1215 ret = sun4i_tcon_init_clocks(dev, tcon);
1216 if (ret) {
1217 dev_err(dev, "Couldn't init our TCON clocks\n");
1218 goto err_assert_reset;
1219 }
1220
1221 ret = sun4i_tcon_init_regmap(dev, tcon);
1222 if (ret) {
1223 dev_err(dev, "Couldn't init our TCON regmap\n");
1224 goto err_assert_reset;
1225 }
1226
1227 if (tcon->quirks->has_channel_0) {
1228 ret = sun4i_dclk_create(dev, tcon);
1229 if (ret) {
1230 dev_err(dev, "Couldn't create our TCON dot clock\n");
1231 goto err_assert_reset;
1232 }
1233 }
1234
1235 ret = sun4i_tcon_init_irq(dev, tcon);
1236 if (ret) {
1237 dev_err(dev, "Couldn't init our TCON interrupts\n");
1238 goto err_free_dclk;
1239 }
1240
1241 tcon->crtc = sun4i_crtc_init(drm, engine, tcon);
1242 if (IS_ERR(tcon->crtc)) {
1243 dev_err(dev, "Couldn't create our CRTC\n");
1244 ret = PTR_ERR(tcon->crtc);
1245 goto err_free_dclk;
1246 }
1247
1248 if (tcon->quirks->has_channel_0) {
1249 /*
1250 * If we have an LVDS panel connected to the TCON, we should
1251 * just probe the LVDS connector. Otherwise, just probe RGB as
1252 * we used to.
1253 */
1254 remote = of_graph_get_remote_node(dev->of_node, 1, 0);
1255 if (of_device_is_compatible(remote, "panel-lvds"))
1256 if (can_lvds)
1257 ret = sun4i_lvds_init(drm, tcon);
1258 else
1259 ret = -EINVAL;
1260 else
1261 ret = sun4i_rgb_init(drm, tcon);
1262 of_node_put(remote);
1263
1264 if (ret < 0)
1265 goto err_free_dclk;
1266 }
1267
1268 if (tcon->quirks->needs_de_be_mux) {
1269 /*
1270 * We assume there is no dynamic muxing of backends
1271 * and TCONs, so we select the backend with same ID.
1272 *
1273 * While dynamic selection might be interesting, since
1274 * the CRTC is tied to the TCON, while the layers are
1275 * tied to the backends, this means, we will need to
1276 * switch between groups of layers. There might not be
1277 * a way to represent this constraint in DRM.
1278 */
1279 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
1280 SUN4I_TCON0_CTL_SRC_SEL_MASK,
1281 tcon->id);
1282 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
1283 SUN4I_TCON1_CTL_SRC_SEL_MASK,
1284 tcon->id);
1285 }
1286
1287 list_add_tail(&tcon->list, &drv->tcon_list);
1288
1289 return 0;
1290
1291 err_free_dclk:
1292 if (tcon->quirks->has_channel_0)
1293 sun4i_dclk_free(tcon);
1294 err_assert_reset:
1295 reset_control_assert(tcon->lcd_rst);
1296 return ret;
1297 }
1298
sun4i_tcon_unbind(struct device * dev,struct device * master,void * data)1299 static void sun4i_tcon_unbind(struct device *dev, struct device *master,
1300 void *data)
1301 {
1302 struct sun4i_tcon *tcon = dev_get_drvdata(dev);
1303
1304 list_del(&tcon->list);
1305 if (tcon->quirks->has_channel_0)
1306 sun4i_dclk_free(tcon);
1307 }
1308
1309 static const struct component_ops sun4i_tcon_ops = {
1310 .bind = sun4i_tcon_bind,
1311 .unbind = sun4i_tcon_unbind,
1312 };
1313
sun4i_tcon_probe(struct platform_device * pdev)1314 static int sun4i_tcon_probe(struct platform_device *pdev)
1315 {
1316 struct device_node *node = pdev->dev.of_node;
1317 const struct sun4i_tcon_quirks *quirks;
1318 struct drm_bridge *bridge;
1319 struct drm_panel *panel;
1320 int ret;
1321
1322 quirks = of_device_get_match_data(&pdev->dev);
1323
1324 /* panels and bridges are present only on TCONs with channel 0 */
1325 if (quirks->has_channel_0) {
1326 ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
1327 if (ret == -EPROBE_DEFER)
1328 return ret;
1329 }
1330
1331 return component_add(&pdev->dev, &sun4i_tcon_ops);
1332 }
1333
sun4i_tcon_remove(struct platform_device * pdev)1334 static void sun4i_tcon_remove(struct platform_device *pdev)
1335 {
1336 component_del(&pdev->dev, &sun4i_tcon_ops);
1337 }
1338
1339 /* platform specific TCON muxing callbacks */
sun4i_a10_tcon_set_mux(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)1340 static int sun4i_a10_tcon_set_mux(struct sun4i_tcon *tcon,
1341 const struct drm_encoder *encoder)
1342 {
1343 struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
1344 u32 shift;
1345
1346 if (!tcon0)
1347 return -EINVAL;
1348
1349 switch (encoder->encoder_type) {
1350 case DRM_MODE_ENCODER_TMDS:
1351 /* HDMI */
1352 shift = 8;
1353 break;
1354 default:
1355 return -EINVAL;
1356 }
1357
1358 regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
1359 0x3 << shift, tcon->id << shift);
1360
1361 return 0;
1362 }
1363
sun5i_a13_tcon_set_mux(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)1364 static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon,
1365 const struct drm_encoder *encoder)
1366 {
1367 u32 val;
1368
1369 if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
1370 val = 1;
1371 else
1372 val = 0;
1373
1374 /*
1375 * FIXME: Undocumented bits
1376 */
1377 return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
1378 }
1379
sun6i_tcon_set_mux(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)1380 static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon,
1381 const struct drm_encoder *encoder)
1382 {
1383 struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
1384 u32 shift;
1385
1386 if (!tcon0)
1387 return -EINVAL;
1388
1389 switch (encoder->encoder_type) {
1390 case DRM_MODE_ENCODER_TMDS:
1391 /* HDMI */
1392 shift = 8;
1393 break;
1394 default:
1395 /* TODO A31 has MIPI DSI but A31s does not */
1396 return -EINVAL;
1397 }
1398
1399 regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
1400 0x3 << shift, tcon->id << shift);
1401
1402 return 0;
1403 }
1404
sun8i_r40_tcon_tv_set_mux(struct sun4i_tcon * tcon,const struct drm_encoder * encoder)1405 static int sun8i_r40_tcon_tv_set_mux(struct sun4i_tcon *tcon,
1406 const struct drm_encoder *encoder)
1407 {
1408 struct device_node *port, *remote;
1409 struct platform_device *pdev;
1410 int id, ret;
1411
1412 /* find TCON TOP platform device and TCON id */
1413
1414 port = of_graph_get_port_by_id(tcon->dev->of_node, 0);
1415 if (!port)
1416 return -EINVAL;
1417
1418 id = sun4i_tcon_of_get_id_from_port(port);
1419 of_node_put(port);
1420
1421 remote = of_graph_get_remote_node(tcon->dev->of_node, 0, -1);
1422 if (!remote)
1423 return -EINVAL;
1424
1425 pdev = of_find_device_by_node(remote);
1426 of_node_put(remote);
1427 if (!pdev)
1428 return -EINVAL;
1429
1430 if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
1431 encoder->encoder_type == DRM_MODE_ENCODER_TMDS) {
1432 ret = sun8i_tcon_top_set_hdmi_src(&pdev->dev, id);
1433 if (ret) {
1434 put_device(&pdev->dev);
1435 return ret;
1436 }
1437 }
1438
1439 if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP)) {
1440 ret = sun8i_tcon_top_de_config(&pdev->dev, tcon->id, id);
1441 if (ret) {
1442 put_device(&pdev->dev);
1443 return ret;
1444 }
1445 }
1446
1447 return 0;
1448 }
1449
1450 static const struct sun4i_tcon_quirks sun4i_a10_quirks = {
1451 .has_channel_0 = true,
1452 .has_channel_1 = true,
1453 .dclk_min_div = 4,
1454 .set_mux = sun4i_a10_tcon_set_mux,
1455 };
1456
1457 static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
1458 .has_channel_0 = true,
1459 .has_channel_1 = true,
1460 .dclk_min_div = 4,
1461 .set_mux = sun5i_a13_tcon_set_mux,
1462 };
1463
1464 static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
1465 .has_channel_0 = true,
1466 .has_channel_1 = true,
1467 .has_lvds_alt = true,
1468 .needs_de_be_mux = true,
1469 .dclk_min_div = 1,
1470 .set_mux = sun6i_tcon_set_mux,
1471 };
1472
1473 static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
1474 .has_channel_0 = true,
1475 .has_channel_1 = true,
1476 .needs_de_be_mux = true,
1477 .dclk_min_div = 1,
1478 };
1479
1480 static const struct sun4i_tcon_quirks sun7i_a20_tcon0_quirks = {
1481 .supports_lvds = true,
1482 .has_channel_0 = true,
1483 .has_channel_1 = true,
1484 .dclk_min_div = 4,
1485 /* Same display pipeline structure as A10 */
1486 .set_mux = sun4i_a10_tcon_set_mux,
1487 .setup_lvds_phy = sun4i_tcon_setup_lvds_phy,
1488 };
1489
1490 static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
1491 .has_channel_0 = true,
1492 .has_channel_1 = true,
1493 .dclk_min_div = 4,
1494 /* Same display pipeline structure as A10 */
1495 .set_mux = sun4i_a10_tcon_set_mux,
1496 };
1497
1498 static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
1499 .has_channel_0 = true,
1500 .has_lvds_alt = true,
1501 .dclk_min_div = 1,
1502 .setup_lvds_phy = sun6i_tcon_setup_lvds_phy,
1503 .supports_lvds = true,
1504 };
1505
1506 static const struct sun4i_tcon_quirks sun8i_a83t_lcd_quirks = {
1507 .supports_lvds = true,
1508 .has_channel_0 = true,
1509 .dclk_min_div = 1,
1510 .setup_lvds_phy = sun6i_tcon_setup_lvds_phy,
1511 };
1512
1513 static const struct sun4i_tcon_quirks sun8i_a83t_tv_quirks = {
1514 .has_channel_1 = true,
1515 };
1516
1517 static const struct sun4i_tcon_quirks sun8i_r40_tv_quirks = {
1518 .has_channel_1 = true,
1519 .polarity_in_ch0 = true,
1520 .set_mux = sun8i_r40_tcon_tv_set_mux,
1521 };
1522
1523 static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
1524 .has_channel_0 = true,
1525 .dclk_min_div = 1,
1526 };
1527
1528 static const struct sun4i_tcon_quirks sun9i_a80_tcon_lcd_quirks = {
1529 .has_channel_0 = true,
1530 .needs_edp_reset = true,
1531 .dclk_min_div = 1,
1532 };
1533
1534 static const struct sun4i_tcon_quirks sun9i_a80_tcon_tv_quirks = {
1535 .has_channel_1 = true,
1536 .needs_edp_reset = true,
1537 };
1538
1539 static const struct sun4i_tcon_quirks sun20i_d1_lcd_quirks = {
1540 .has_channel_0 = true,
1541 .dclk_min_div = 1,
1542 .set_mux = sun8i_r40_tcon_tv_set_mux,
1543 };
1544
1545 /* sun4i_drv uses this list to check if a device node is a TCON */
1546 const struct of_device_id sun4i_tcon_of_table[] = {
1547 { .compatible = "allwinner,sun4i-a10-tcon", .data = &sun4i_a10_quirks },
1548 { .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
1549 { .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
1550 { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
1551 { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks },
1552 { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_tcon0_quirks },
1553 { .compatible = "allwinner,sun7i-a20-tcon1", .data = &sun7i_a20_quirks },
1554 { .compatible = "allwinner,sun8i-a23-tcon", .data = &sun8i_a33_quirks },
1555 { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
1556 { .compatible = "allwinner,sun8i-a83t-tcon-lcd", .data = &sun8i_a83t_lcd_quirks },
1557 { .compatible = "allwinner,sun8i-a83t-tcon-tv", .data = &sun8i_a83t_tv_quirks },
1558 { .compatible = "allwinner,sun8i-r40-tcon-tv", .data = &sun8i_r40_tv_quirks },
1559 { .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
1560 { .compatible = "allwinner,sun9i-a80-tcon-lcd", .data = &sun9i_a80_tcon_lcd_quirks },
1561 { .compatible = "allwinner,sun9i-a80-tcon-tv", .data = &sun9i_a80_tcon_tv_quirks },
1562 { .compatible = "allwinner,sun20i-d1-tcon-lcd", .data = &sun20i_d1_lcd_quirks },
1563 { .compatible = "allwinner,sun20i-d1-tcon-tv", .data = &sun8i_r40_tv_quirks },
1564 { }
1565 };
1566 MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
1567 EXPORT_SYMBOL(sun4i_tcon_of_table);
1568
1569 static struct platform_driver sun4i_tcon_platform_driver = {
1570 .probe = sun4i_tcon_probe,
1571 .remove_new = sun4i_tcon_remove,
1572 .driver = {
1573 .name = "sun4i-tcon",
1574 .of_match_table = sun4i_tcon_of_table,
1575 },
1576 };
1577 module_platform_driver(sun4i_tcon_platform_driver);
1578
1579 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1580 MODULE_DESCRIPTION("Allwinner A10 Timing Controller Driver");
1581 MODULE_LICENSE("GPL");
1582