1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2020 Amarula Solutions(India)
4 * Author: Jagan Teki <jagan@amarulasolutions.com>
5 */
6
7 #include <drm/drm_atomic_helper.h>
8 #include <drm/drm_of.h>
9 #include <drm/drm_print.h>
10 #include <drm/drm_mipi_dsi.h>
11
12 #include <linux/bitfield.h>
13 #include <linux/bits.h>
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/i2c.h>
18 #include <linux/media-bus-format.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/regmap.h>
22 #include <linux/regulator/consumer.h>
23
24 #define VENDOR_ID 0x00
25 #define DEVICE_ID_H 0x01
26 #define DEVICE_ID_L 0x02
27 #define VERSION_ID 0x03
28 #define FIRMWARE_VERSION 0x08
29 #define CONFIG_FINISH 0x09
30 #define PD_CTRL(n) (0x0a + ((n) & 0x3)) /* 0..3 */
31 #define RST_CTRL(n) (0x0e + ((n) & 0x1)) /* 0..1 */
32 #define SYS_CTRL(n) (0x10 + ((n) & 0x7)) /* 0..4 */
33 #define SYS_CTRL_1_CLK_PHASE_MSK GENMASK(5, 4)
34 #define CLK_PHASE_0 0
35 #define CLK_PHASE_1_4 1
36 #define CLK_PHASE_1_2 2
37 #define CLK_PHASE_3_4 3
38 #define RGB_DRV(n) (0x18 + ((n) & 0x3)) /* 0..3 */
39 #define RGB_DLY(n) (0x1c + ((n) & 0x1)) /* 0..1 */
40 #define RGB_TEST_CTRL 0x1e
41 #define ATE_PLL_EN 0x1f
42 #define HACTIVE_LI 0x20
43 #define VACTIVE_LI 0x21
44 #define VACTIVE_HACTIVE_HI 0x22
45 #define HFP_LI 0x23
46 #define HSYNC_LI 0x24
47 #define HBP_LI 0x25
48 #define HFP_HSW_HBP_HI 0x26
49 #define HFP_HSW_HBP_HI_HFP(n) (((n) & 0x300) >> 4)
50 #define HFP_HSW_HBP_HI_HS(n) (((n) & 0x300) >> 6)
51 #define HFP_HSW_HBP_HI_HBP(n) (((n) & 0x300) >> 8)
52 #define VFP 0x27
53 #define VSYNC 0x28
54 #define VBP 0x29
55 #define BIST_POL 0x2a
56 #define BIST_POL_BIST_MODE(n) (((n) & 0xf) << 4)
57 #define BIST_POL_BIST_GEN BIT(3)
58 #define BIST_POL_HSYNC_POL BIT(2)
59 #define BIST_POL_VSYNC_POL BIT(1)
60 #define BIST_POL_DE_POL BIT(0)
61 #define BIST_RED 0x2b
62 #define BIST_GREEN 0x2c
63 #define BIST_BLUE 0x2d
64 #define BIST_CHESS_X 0x2e
65 #define BIST_CHESS_Y 0x2f
66 #define BIST_CHESS_XY_H 0x30
67 #define BIST_FRAME_TIME_L 0x31
68 #define BIST_FRAME_TIME_H 0x32
69 #define FIFO_MAX_ADDR_LOW 0x33
70 #define SYNC_EVENT_DLY 0x34
71 #define HSW_MIN 0x35
72 #define HFP_MIN 0x36
73 #define LOGIC_RST_NUM 0x37
74 #define OSC_CTRL(n) (0x48 + ((n) & 0x7)) /* 0..5 */
75 #define BG_CTRL 0x4e
76 #define LDO_PLL 0x4f
77 #define PLL_CTRL(n) (0x50 + ((n) & 0xf)) /* 0..15 */
78 #define PLL_CTRL_6_EXTERNAL 0x90
79 #define PLL_CTRL_6_MIPI_CLK 0x92
80 #define PLL_CTRL_6_INTERNAL 0x93
81 #define PLL_REM(n) (0x60 + ((n) & 0x3)) /* 0..2 */
82 #define PLL_DIV(n) (0x63 + ((n) & 0x3)) /* 0..2 */
83 #define PLL_FRAC(n) (0x66 + ((n) & 0x3)) /* 0..2 */
84 #define PLL_INT(n) (0x69 + ((n) & 0x1)) /* 0..1 */
85 #define PLL_REF_DIV 0x6b
86 #define PLL_REF_DIV_P(n) ((n) & 0xf)
87 #define PLL_REF_DIV_Pe BIT(4)
88 #define PLL_REF_DIV_S(n) (((n) & 0x7) << 5)
89 #define PLL_SSC_P(n) (0x6c + ((n) & 0x3)) /* 0..2 */
90 #define PLL_SSC_STEP(n) (0x6f + ((n) & 0x3)) /* 0..2 */
91 #define PLL_SSC_OFFSET(n) (0x72 + ((n) & 0x3)) /* 0..3 */
92 #define GPIO_OEN 0x79
93 #define MIPI_CFG_PW 0x7a
94 #define MIPI_CFG_PW_CONFIG_DSI 0xc1
95 #define MIPI_CFG_PW_CONFIG_I2C 0x3e
96 #define GPIO_SEL(n) (0x7b + ((n) & 0x1)) /* 0..1 */
97 #define IRQ_SEL 0x7d
98 #define DBG_SEL 0x7e
99 #define DBG_SIGNAL 0x7f
100 #define MIPI_ERR_VECTOR_L 0x80
101 #define MIPI_ERR_VECTOR_H 0x81
102 #define MIPI_ERR_VECTOR_EN_L 0x82
103 #define MIPI_ERR_VECTOR_EN_H 0x83
104 #define MIPI_MAX_SIZE_L 0x84
105 #define MIPI_MAX_SIZE_H 0x85
106 #define DSI_CTRL 0x86
107 #define DSI_CTRL_UNKNOWN 0x28
108 #define DSI_CTRL_DSI_LANES(n) ((n) & 0x3)
109 #define MIPI_PN_SWAP 0x87
110 #define MIPI_PN_SWAP_CLK BIT(4)
111 #define MIPI_PN_SWAP_D(n) BIT((n) & 0x3)
112 #define MIPI_SOT_SYNC_BIT(n) (0x88 + ((n) & 0x1)) /* 0..1 */
113 #define MIPI_ULPS_CTRL 0x8a
114 #define MIPI_CLK_CHK_VAR 0x8e
115 #define MIPI_CLK_CHK_INI 0x8f
116 #define MIPI_T_TERM_EN 0x90
117 #define MIPI_T_HS_SETTLE 0x91
118 #define MIPI_T_TA_SURE_PRE 0x92
119 #define MIPI_T_LPX_SET 0x94
120 #define MIPI_T_CLK_MISS 0x95
121 #define MIPI_INIT_TIME_L 0x96
122 #define MIPI_INIT_TIME_H 0x97
123 #define MIPI_T_CLK_TERM_EN 0x99
124 #define MIPI_T_CLK_SETTLE 0x9a
125 #define MIPI_TO_HS_RX_L 0x9e
126 #define MIPI_TO_HS_RX_H 0x9f
127 #define MIPI_PHY(n) (0xa0 + ((n) & 0x7)) /* 0..5 */
128 #define MIPI_PD_RX 0xb0
129 #define MIPI_PD_TERM 0xb1
130 #define MIPI_PD_HSRX 0xb2
131 #define MIPI_PD_LPTX 0xb3
132 #define MIPI_PD_LPRX 0xb4
133 #define MIPI_PD_CK_LANE 0xb5
134 #define MIPI_FORCE_0 0xb6
135 #define MIPI_RST_CTRL 0xb7
136 #define MIPI_RST_NUM 0xb8
137 #define MIPI_DBG_SET(n) (0xc0 + ((n) & 0xf)) /* 0..9 */
138 #define MIPI_DBG_SEL 0xe0
139 #define MIPI_DBG_DATA 0xe1
140 #define MIPI_ATE_TEST_SEL 0xe2
141 #define MIPI_ATE_STATUS(n) (0xe3 + ((n) & 0x1)) /* 0..1 */
142
143 struct chipone {
144 struct device *dev;
145 struct regmap *regmap;
146 struct i2c_client *client;
147 struct drm_bridge bridge;
148 struct drm_display_mode mode;
149 struct drm_bridge *panel_bridge;
150 struct mipi_dsi_device *dsi;
151 struct gpio_desc *enable_gpio;
152 struct regulator *vdd1;
153 struct regulator *vdd2;
154 struct regulator *vdd3;
155 struct clk *refclk;
156 unsigned long refclk_rate;
157 bool interface_i2c;
158 };
159
160 static const struct regmap_range chipone_dsi_readable_ranges[] = {
161 regmap_reg_range(VENDOR_ID, VERSION_ID),
162 regmap_reg_range(FIRMWARE_VERSION, PLL_SSC_OFFSET(3)),
163 regmap_reg_range(GPIO_OEN, MIPI_ULPS_CTRL),
164 regmap_reg_range(MIPI_CLK_CHK_VAR, MIPI_T_TA_SURE_PRE),
165 regmap_reg_range(MIPI_T_LPX_SET, MIPI_INIT_TIME_H),
166 regmap_reg_range(MIPI_T_CLK_TERM_EN, MIPI_T_CLK_SETTLE),
167 regmap_reg_range(MIPI_TO_HS_RX_L, MIPI_PHY(5)),
168 regmap_reg_range(MIPI_PD_RX, MIPI_RST_NUM),
169 regmap_reg_range(MIPI_DBG_SET(0), MIPI_DBG_SET(9)),
170 regmap_reg_range(MIPI_DBG_SEL, MIPI_ATE_STATUS(1)),
171 };
172
173 static const struct regmap_access_table chipone_dsi_readable_table = {
174 .yes_ranges = chipone_dsi_readable_ranges,
175 .n_yes_ranges = ARRAY_SIZE(chipone_dsi_readable_ranges),
176 };
177
178 static const struct regmap_range chipone_dsi_writeable_ranges[] = {
179 regmap_reg_range(CONFIG_FINISH, PLL_SSC_OFFSET(3)),
180 regmap_reg_range(GPIO_OEN, MIPI_ULPS_CTRL),
181 regmap_reg_range(MIPI_CLK_CHK_VAR, MIPI_T_TA_SURE_PRE),
182 regmap_reg_range(MIPI_T_LPX_SET, MIPI_INIT_TIME_H),
183 regmap_reg_range(MIPI_T_CLK_TERM_EN, MIPI_T_CLK_SETTLE),
184 regmap_reg_range(MIPI_TO_HS_RX_L, MIPI_PHY(5)),
185 regmap_reg_range(MIPI_PD_RX, MIPI_RST_NUM),
186 regmap_reg_range(MIPI_DBG_SET(0), MIPI_DBG_SET(9)),
187 regmap_reg_range(MIPI_DBG_SEL, MIPI_ATE_STATUS(1)),
188 };
189
190 static const struct regmap_access_table chipone_dsi_writeable_table = {
191 .yes_ranges = chipone_dsi_writeable_ranges,
192 .n_yes_ranges = ARRAY_SIZE(chipone_dsi_writeable_ranges),
193 };
194
195 static const struct regmap_config chipone_regmap_config = {
196 .reg_bits = 8,
197 .val_bits = 8,
198 .rd_table = &chipone_dsi_readable_table,
199 .wr_table = &chipone_dsi_writeable_table,
200 .cache_type = REGCACHE_RBTREE,
201 .max_register = MIPI_ATE_STATUS(1),
202 };
203
chipone_dsi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)204 static int chipone_dsi_read(void *context,
205 const void *reg, size_t reg_size,
206 void *val, size_t val_size)
207 {
208 struct mipi_dsi_device *dsi = context;
209 const u16 reg16 = (val_size << 8) | *(u8 *)reg;
210 int ret;
211
212 ret = mipi_dsi_generic_read(dsi, ®16, 2, val, val_size);
213
214 return ret == val_size ? 0 : -EINVAL;
215 }
216
chipone_dsi_write(void * context,const void * data,size_t count)217 static int chipone_dsi_write(void *context, const void *data, size_t count)
218 {
219 struct mipi_dsi_device *dsi = context;
220
221 return mipi_dsi_generic_write(dsi, data, 2);
222 }
223
224 static const struct regmap_bus chipone_dsi_regmap_bus = {
225 .read = chipone_dsi_read,
226 .write = chipone_dsi_write,
227 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
228 .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
229 };
230
bridge_to_chipone(struct drm_bridge * bridge)231 static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
232 {
233 return container_of(bridge, struct chipone, bridge);
234 }
235
chipone_readb(struct chipone * icn,u8 reg,u8 * val)236 static void chipone_readb(struct chipone *icn, u8 reg, u8 *val)
237 {
238 int ret, pval;
239
240 ret = regmap_read(icn->regmap, reg, &pval);
241
242 *val = ret ? 0 : pval & 0xff;
243 }
244
chipone_writeb(struct chipone * icn,u8 reg,u8 val)245 static int chipone_writeb(struct chipone *icn, u8 reg, u8 val)
246 {
247 return regmap_write(icn->regmap, reg, val);
248 }
249
chipone_configure_pll(struct chipone * icn,const struct drm_display_mode * mode)250 static void chipone_configure_pll(struct chipone *icn,
251 const struct drm_display_mode *mode)
252 {
253 unsigned int best_p = 0, best_m = 0, best_s = 0;
254 unsigned int mode_clock = mode->clock * 1000;
255 unsigned int delta, min_delta = 0xffffffff;
256 unsigned int freq_p, freq_s, freq_out;
257 unsigned int p_min, p_max;
258 unsigned int p, m, s;
259 unsigned int fin;
260 bool best_p_pot;
261 u8 ref_div;
262
263 /*
264 * DSI byte clock frequency (input into PLL) is calculated as:
265 * DSI_CLK = HS clock / 4
266 *
267 * DPI pixel clock frequency (output from PLL) is mode clock.
268 *
269 * The chip contains fractional PLL which works as follows:
270 * DPI_CLK = ((DSI_CLK / P) * M) / S
271 * P is pre-divider, register PLL_REF_DIV[3:0] is 1:n divider
272 * register PLL_REF_DIV[4] is extra 1:2 divider
273 * M is integer multiplier, register PLL_INT(0) is multiplier
274 * S is post-divider, register PLL_REF_DIV[7:5] is 2^(n+1) divider
275 *
276 * It seems the PLL input clock after applying P pre-divider have
277 * to be lower than 20 MHz.
278 */
279 if (icn->refclk)
280 fin = icn->refclk_rate;
281 else
282 fin = icn->dsi->hs_rate / 4; /* in Hz */
283
284 /* Minimum value of P predivider for PLL input in 5..20 MHz */
285 p_min = clamp(DIV_ROUND_UP(fin, 20000000), 1U, 31U);
286 p_max = clamp(fin / 5000000, 1U, 31U);
287
288 for (p = p_min; p < p_max; p++) { /* PLL_REF_DIV[4,3:0] */
289 if (p > 16 && p & 1) /* P > 16 uses extra /2 */
290 continue;
291 freq_p = fin / p;
292 if (freq_p == 0) /* Divider too high */
293 break;
294
295 for (s = 0; s < 0x7; s++) { /* PLL_REF_DIV[7:5] */
296 freq_s = freq_p / BIT(s + 1);
297 if (freq_s == 0) /* Divider too high */
298 break;
299
300 m = mode_clock / freq_s;
301
302 /* Multiplier is 8 bit */
303 if (m > 0xff)
304 continue;
305
306 /* Limit PLL VCO frequency to 1 GHz */
307 freq_out = (fin * m) / p;
308 if (freq_out > 1000000000)
309 continue;
310
311 /* Apply post-divider */
312 freq_out /= BIT(s + 1);
313
314 delta = abs(mode_clock - freq_out);
315 if (delta < min_delta) {
316 best_p = p;
317 best_m = m;
318 best_s = s;
319 min_delta = delta;
320 }
321 }
322 }
323
324 best_p_pot = !(best_p & 1);
325
326 dev_dbg(icn->dev,
327 "PLL: P[3:0]=%d P[4]=2*%d M=%d S[7:5]=2^%d delta=%d => DSI f_in(%s)=%d Hz ; DPI f_out=%d Hz\n",
328 best_p >> best_p_pot, best_p_pot, best_m, best_s + 1,
329 min_delta, icn->refclk ? "EXT" : "DSI", fin,
330 (fin * best_m) / (best_p << (best_s + 1)));
331
332 ref_div = PLL_REF_DIV_P(best_p >> best_p_pot) | PLL_REF_DIV_S(best_s);
333 if (best_p_pot) /* Prefer /2 pre-divider */
334 ref_div |= PLL_REF_DIV_Pe;
335
336 /* Clock source selection either external clock or MIPI DSI clock lane */
337 chipone_writeb(icn, PLL_CTRL(6),
338 icn->refclk ? PLL_CTRL_6_EXTERNAL : PLL_CTRL_6_MIPI_CLK);
339 chipone_writeb(icn, PLL_REF_DIV, ref_div);
340 chipone_writeb(icn, PLL_INT(0), best_m);
341 }
342
chipone_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)343 static void chipone_atomic_enable(struct drm_bridge *bridge,
344 struct drm_bridge_state *old_bridge_state)
345 {
346 struct chipone *icn = bridge_to_chipone(bridge);
347 struct drm_atomic_state *state = old_bridge_state->base.state;
348 struct drm_display_mode *mode = &icn->mode;
349 const struct drm_bridge_state *bridge_state;
350 u16 hfp, hbp, hsync;
351 u32 bus_flags;
352 u8 pol, sys_ctrl_1, id[4];
353
354 chipone_readb(icn, VENDOR_ID, id);
355 chipone_readb(icn, DEVICE_ID_H, id + 1);
356 chipone_readb(icn, DEVICE_ID_L, id + 2);
357 chipone_readb(icn, VERSION_ID, id + 3);
358
359 dev_dbg(icn->dev,
360 "Chip IDs: Vendor=0x%02x Device=0x%02x:0x%02x Version=0x%02x\n",
361 id[0], id[1], id[2], id[3]);
362
363 if (id[0] != 0xc1 || id[1] != 0x62 || id[2] != 0x11) {
364 dev_dbg(icn->dev, "Invalid Chip IDs, aborting configuration\n");
365 return;
366 }
367
368 /* Get the DPI flags from the bridge state. */
369 bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
370 bus_flags = bridge_state->output_bus_cfg.flags;
371
372 if (icn->interface_i2c)
373 chipone_writeb(icn, MIPI_CFG_PW, MIPI_CFG_PW_CONFIG_I2C);
374 else
375 chipone_writeb(icn, MIPI_CFG_PW, MIPI_CFG_PW_CONFIG_DSI);
376
377 chipone_writeb(icn, HACTIVE_LI, mode->hdisplay & 0xff);
378
379 chipone_writeb(icn, VACTIVE_LI, mode->vdisplay & 0xff);
380
381 /*
382 * lsb nibble: 2nd nibble of hdisplay
383 * msb nibble: 2nd nibble of vdisplay
384 */
385 chipone_writeb(icn, VACTIVE_HACTIVE_HI,
386 ((mode->hdisplay >> 8) & 0xf) |
387 (((mode->vdisplay >> 8) & 0xf) << 4));
388
389 hfp = mode->hsync_start - mode->hdisplay;
390 hsync = mode->hsync_end - mode->hsync_start;
391 hbp = mode->htotal - mode->hsync_end;
392
393 chipone_writeb(icn, HFP_LI, hfp & 0xff);
394 chipone_writeb(icn, HSYNC_LI, hsync & 0xff);
395 chipone_writeb(icn, HBP_LI, hbp & 0xff);
396 /* Top two bits of Horizontal Front porch/Sync/Back porch */
397 chipone_writeb(icn, HFP_HSW_HBP_HI,
398 HFP_HSW_HBP_HI_HFP(hfp) |
399 HFP_HSW_HBP_HI_HS(hsync) |
400 HFP_HSW_HBP_HI_HBP(hbp));
401
402 chipone_writeb(icn, VFP, mode->vsync_start - mode->vdisplay);
403
404 chipone_writeb(icn, VSYNC, mode->vsync_end - mode->vsync_start);
405
406 chipone_writeb(icn, VBP, mode->vtotal - mode->vsync_end);
407
408 /* dsi specific sequence */
409 chipone_writeb(icn, SYNC_EVENT_DLY, 0x80);
410 chipone_writeb(icn, HFP_MIN, hfp & 0xff);
411
412 /* DSI data lane count */
413 chipone_writeb(icn, DSI_CTRL,
414 DSI_CTRL_UNKNOWN | DSI_CTRL_DSI_LANES(icn->dsi->lanes - 1));
415
416 chipone_writeb(icn, MIPI_PD_CK_LANE, 0xa0);
417 chipone_writeb(icn, PLL_CTRL(12), 0xff);
418 chipone_writeb(icn, MIPI_PN_SWAP, 0x00);
419
420 /* DPI HS/VS/DE polarity */
421 pol = ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? BIST_POL_HSYNC_POL : 0) |
422 ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? BIST_POL_VSYNC_POL : 0) |
423 ((bus_flags & DRM_BUS_FLAG_DE_HIGH) ? BIST_POL_DE_POL : 0);
424 chipone_writeb(icn, BIST_POL, pol);
425
426 /* Configure PLL settings */
427 chipone_configure_pll(icn, mode);
428
429 chipone_writeb(icn, SYS_CTRL(0), 0x40);
430 sys_ctrl_1 = 0x88;
431
432 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
433 sys_ctrl_1 |= FIELD_PREP(SYS_CTRL_1_CLK_PHASE_MSK, CLK_PHASE_0);
434 else
435 sys_ctrl_1 |= FIELD_PREP(SYS_CTRL_1_CLK_PHASE_MSK, CLK_PHASE_1_2);
436
437 chipone_writeb(icn, SYS_CTRL(1), sys_ctrl_1);
438
439 /* icn6211 specific sequence */
440 chipone_writeb(icn, MIPI_FORCE_0, 0x20);
441 chipone_writeb(icn, PLL_CTRL(1), 0x20);
442 chipone_writeb(icn, CONFIG_FINISH, 0x10);
443
444 usleep_range(10000, 11000);
445 }
446
chipone_atomic_pre_enable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)447 static void chipone_atomic_pre_enable(struct drm_bridge *bridge,
448 struct drm_bridge_state *old_bridge_state)
449 {
450 struct chipone *icn = bridge_to_chipone(bridge);
451 int ret;
452
453 if (icn->vdd1) {
454 ret = regulator_enable(icn->vdd1);
455 if (ret)
456 DRM_DEV_ERROR(icn->dev,
457 "failed to enable VDD1 regulator: %d\n", ret);
458 }
459
460 if (icn->vdd2) {
461 ret = regulator_enable(icn->vdd2);
462 if (ret)
463 DRM_DEV_ERROR(icn->dev,
464 "failed to enable VDD2 regulator: %d\n", ret);
465 }
466
467 if (icn->vdd3) {
468 ret = regulator_enable(icn->vdd3);
469 if (ret)
470 DRM_DEV_ERROR(icn->dev,
471 "failed to enable VDD3 regulator: %d\n", ret);
472 }
473
474 ret = clk_prepare_enable(icn->refclk);
475 if (ret)
476 DRM_DEV_ERROR(icn->dev,
477 "failed to enable RECLK clock: %d\n", ret);
478
479 gpiod_set_value(icn->enable_gpio, 1);
480
481 usleep_range(10000, 11000);
482 }
483
chipone_atomic_post_disable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)484 static void chipone_atomic_post_disable(struct drm_bridge *bridge,
485 struct drm_bridge_state *old_bridge_state)
486 {
487 struct chipone *icn = bridge_to_chipone(bridge);
488
489 clk_disable_unprepare(icn->refclk);
490
491 if (icn->vdd1)
492 regulator_disable(icn->vdd1);
493
494 if (icn->vdd2)
495 regulator_disable(icn->vdd2);
496
497 if (icn->vdd3)
498 regulator_disable(icn->vdd3);
499
500 gpiod_set_value(icn->enable_gpio, 0);
501 }
502
chipone_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)503 static void chipone_mode_set(struct drm_bridge *bridge,
504 const struct drm_display_mode *mode,
505 const struct drm_display_mode *adjusted_mode)
506 {
507 struct chipone *icn = bridge_to_chipone(bridge);
508
509 drm_mode_copy(&icn->mode, adjusted_mode);
510 };
511
chipone_dsi_attach(struct chipone * icn)512 static int chipone_dsi_attach(struct chipone *icn)
513 {
514 struct mipi_dsi_device *dsi = icn->dsi;
515 struct device *dev = icn->dev;
516 int dsi_lanes, ret;
517
518 dsi_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, 0, 1, 4);
519
520 /*
521 * If the 'data-lanes' property does not exist in DT or is invalid,
522 * default to previously hard-coded behavior, which was 4 data lanes.
523 */
524 if (dsi_lanes < 0)
525 icn->dsi->lanes = 4;
526 else
527 icn->dsi->lanes = dsi_lanes;
528
529 dsi->format = MIPI_DSI_FMT_RGB888;
530 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
531 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;
532 dsi->hs_rate = 500000000;
533 dsi->lp_rate = 16000000;
534
535 ret = mipi_dsi_attach(dsi);
536 if (ret < 0)
537 dev_err(icn->dev, "failed to attach dsi\n");
538
539 return ret;
540 }
541
chipone_dsi_host_attach(struct chipone * icn)542 static int chipone_dsi_host_attach(struct chipone *icn)
543 {
544 struct device *dev = icn->dev;
545 struct device_node *host_node;
546 struct device_node *endpoint;
547 struct mipi_dsi_device *dsi;
548 struct mipi_dsi_host *host;
549 int ret = 0;
550
551 const struct mipi_dsi_device_info info = {
552 .type = "chipone",
553 .channel = 0,
554 .node = NULL,
555 };
556
557 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
558 host_node = of_graph_get_remote_port_parent(endpoint);
559 of_node_put(endpoint);
560
561 if (!host_node)
562 return -EINVAL;
563
564 host = of_find_mipi_dsi_host_by_node(host_node);
565 of_node_put(host_node);
566 if (!host)
567 return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");
568
569 dsi = mipi_dsi_device_register_full(host, &info);
570 if (IS_ERR(dsi)) {
571 return dev_err_probe(dev, PTR_ERR(dsi),
572 "failed to create dsi device\n");
573 }
574
575 icn->dsi = dsi;
576
577 ret = chipone_dsi_attach(icn);
578 if (ret < 0)
579 mipi_dsi_device_unregister(dsi);
580
581 return ret;
582 }
583
chipone_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)584 static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
585 {
586 struct chipone *icn = bridge_to_chipone(bridge);
587
588 return drm_bridge_attach(bridge->encoder, icn->panel_bridge, bridge, flags);
589 }
590
591 #define MAX_INPUT_SEL_FORMATS 1
592
593 static u32 *
chipone_atomic_get_input_bus_fmts(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state,u32 output_fmt,unsigned int * num_input_fmts)594 chipone_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
595 struct drm_bridge_state *bridge_state,
596 struct drm_crtc_state *crtc_state,
597 struct drm_connector_state *conn_state,
598 u32 output_fmt,
599 unsigned int *num_input_fmts)
600 {
601 u32 *input_fmts;
602
603 *num_input_fmts = 0;
604
605 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
606 GFP_KERNEL);
607 if (!input_fmts)
608 return NULL;
609
610 /* This is the DSI-end bus format */
611 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
612 *num_input_fmts = 1;
613
614 return input_fmts;
615 }
616
617 static const struct drm_bridge_funcs chipone_bridge_funcs = {
618 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
619 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
620 .atomic_reset = drm_atomic_helper_bridge_reset,
621 .atomic_pre_enable = chipone_atomic_pre_enable,
622 .atomic_enable = chipone_atomic_enable,
623 .atomic_post_disable = chipone_atomic_post_disable,
624 .mode_set = chipone_mode_set,
625 .attach = chipone_attach,
626 .atomic_get_input_bus_fmts = chipone_atomic_get_input_bus_fmts,
627 };
628
chipone_parse_dt(struct chipone * icn)629 static int chipone_parse_dt(struct chipone *icn)
630 {
631 struct device *dev = icn->dev;
632 int ret;
633
634 icn->refclk = devm_clk_get_optional(dev, "refclk");
635 if (IS_ERR(icn->refclk)) {
636 ret = PTR_ERR(icn->refclk);
637 DRM_DEV_ERROR(dev, "failed to get REFCLK clock: %d\n", ret);
638 return ret;
639 } else if (icn->refclk) {
640 icn->refclk_rate = clk_get_rate(icn->refclk);
641 if (icn->refclk_rate < 10000000 || icn->refclk_rate > 154000000) {
642 DRM_DEV_ERROR(dev, "REFCLK out of range: %ld Hz\n",
643 icn->refclk_rate);
644 return -EINVAL;
645 }
646 }
647
648 icn->vdd1 = devm_regulator_get_optional(dev, "vdd1");
649 if (IS_ERR(icn->vdd1)) {
650 ret = PTR_ERR(icn->vdd1);
651 if (ret == -EPROBE_DEFER)
652 return -EPROBE_DEFER;
653 icn->vdd1 = NULL;
654 DRM_DEV_DEBUG(dev, "failed to get VDD1 regulator: %d\n", ret);
655 }
656
657 icn->vdd2 = devm_regulator_get_optional(dev, "vdd2");
658 if (IS_ERR(icn->vdd2)) {
659 ret = PTR_ERR(icn->vdd2);
660 if (ret == -EPROBE_DEFER)
661 return -EPROBE_DEFER;
662 icn->vdd2 = NULL;
663 DRM_DEV_DEBUG(dev, "failed to get VDD2 regulator: %d\n", ret);
664 }
665
666 icn->vdd3 = devm_regulator_get_optional(dev, "vdd3");
667 if (IS_ERR(icn->vdd3)) {
668 ret = PTR_ERR(icn->vdd3);
669 if (ret == -EPROBE_DEFER)
670 return -EPROBE_DEFER;
671 icn->vdd3 = NULL;
672 DRM_DEV_DEBUG(dev, "failed to get VDD3 regulator: %d\n", ret);
673 }
674
675 icn->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
676 if (IS_ERR(icn->enable_gpio)) {
677 DRM_DEV_ERROR(dev, "failed to get enable GPIO\n");
678 return PTR_ERR(icn->enable_gpio);
679 }
680
681 icn->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
682 if (IS_ERR(icn->panel_bridge))
683 return PTR_ERR(icn->panel_bridge);
684
685 return 0;
686 }
687
chipone_common_probe(struct device * dev,struct chipone ** icnr)688 static int chipone_common_probe(struct device *dev, struct chipone **icnr)
689 {
690 struct chipone *icn;
691 int ret;
692
693 icn = devm_kzalloc(dev, sizeof(struct chipone), GFP_KERNEL);
694 if (!icn)
695 return -ENOMEM;
696
697 icn->dev = dev;
698
699 ret = chipone_parse_dt(icn);
700 if (ret)
701 return ret;
702
703 icn->bridge.funcs = &chipone_bridge_funcs;
704 icn->bridge.type = DRM_MODE_CONNECTOR_DPI;
705 icn->bridge.of_node = dev->of_node;
706
707 *icnr = icn;
708
709 return ret;
710 }
711
chipone_dsi_probe(struct mipi_dsi_device * dsi)712 static int chipone_dsi_probe(struct mipi_dsi_device *dsi)
713 {
714 struct device *dev = &dsi->dev;
715 struct chipone *icn;
716 int ret;
717
718 ret = chipone_common_probe(dev, &icn);
719 if (ret)
720 return ret;
721
722 icn->regmap = devm_regmap_init(dev, &chipone_dsi_regmap_bus,
723 dsi, &chipone_regmap_config);
724 if (IS_ERR(icn->regmap))
725 return PTR_ERR(icn->regmap);
726
727 icn->interface_i2c = false;
728 icn->dsi = dsi;
729
730 mipi_dsi_set_drvdata(dsi, icn);
731
732 drm_bridge_add(&icn->bridge);
733
734 ret = chipone_dsi_attach(icn);
735 if (ret)
736 drm_bridge_remove(&icn->bridge);
737
738 return ret;
739 }
740
chipone_i2c_probe(struct i2c_client * client)741 static int chipone_i2c_probe(struct i2c_client *client)
742 {
743 struct device *dev = &client->dev;
744 struct chipone *icn;
745 int ret;
746
747 ret = chipone_common_probe(dev, &icn);
748 if (ret)
749 return ret;
750
751 icn->regmap = devm_regmap_init_i2c(client, &chipone_regmap_config);
752 if (IS_ERR(icn->regmap))
753 return PTR_ERR(icn->regmap);
754
755 icn->interface_i2c = true;
756 icn->client = client;
757 dev_set_drvdata(dev, icn);
758 i2c_set_clientdata(client, icn);
759
760 drm_bridge_add(&icn->bridge);
761
762 return chipone_dsi_host_attach(icn);
763 }
764
chipone_dsi_remove(struct mipi_dsi_device * dsi)765 static void chipone_dsi_remove(struct mipi_dsi_device *dsi)
766 {
767 struct chipone *icn = mipi_dsi_get_drvdata(dsi);
768
769 mipi_dsi_detach(dsi);
770 drm_bridge_remove(&icn->bridge);
771 }
772
773 static const struct of_device_id chipone_of_match[] = {
774 { .compatible = "chipone,icn6211", },
775 { /* sentinel */ }
776 };
777 MODULE_DEVICE_TABLE(of, chipone_of_match);
778
779 static struct mipi_dsi_driver chipone_dsi_driver = {
780 .probe = chipone_dsi_probe,
781 .remove = chipone_dsi_remove,
782 .driver = {
783 .name = "chipone-icn6211",
784 .owner = THIS_MODULE,
785 .of_match_table = chipone_of_match,
786 },
787 };
788
789 static struct i2c_device_id chipone_i2c_id[] = {
790 { "chipone,icn6211" },
791 {},
792 };
793 MODULE_DEVICE_TABLE(i2c, chipone_i2c_id);
794
795 static struct i2c_driver chipone_i2c_driver = {
796 .probe = chipone_i2c_probe,
797 .id_table = chipone_i2c_id,
798 .driver = {
799 .name = "chipone-icn6211-i2c",
800 .of_match_table = chipone_of_match,
801 },
802 };
803
chipone_init(void)804 static int __init chipone_init(void)
805 {
806 if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
807 mipi_dsi_driver_register(&chipone_dsi_driver);
808
809 return i2c_add_driver(&chipone_i2c_driver);
810 }
811 module_init(chipone_init);
812
chipone_exit(void)813 static void __exit chipone_exit(void)
814 {
815 i2c_del_driver(&chipone_i2c_driver);
816
817 if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
818 mipi_dsi_driver_unregister(&chipone_dsi_driver);
819 }
820 module_exit(chipone_exit);
821
822 MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
823 MODULE_DESCRIPTION("Chipone ICN6211 MIPI-DSI to RGB Converter Bridge");
824 MODULE_LICENSE("GPL");
825