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
143struct 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
160static 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
173static 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
178static 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
190static 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
195static 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_MAPLE,
201 .max_register = MIPI_ATE_STATUS(1),
202};
203
204static 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, params: &reg16, num_params: 2, data: val, size: val_size);
213
214 return ret == val_size ? 0 : -EINVAL;
215}
216
217static 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, payload: data, size: 2);
222}
223
224static 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
231static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
232{
233 return container_of(bridge, struct chipone, bridge);
234}
235
236static void chipone_readb(struct chipone *icn, u8 reg, u8 *val)
237{
238 int ret, pval;
239
240 ret = regmap_read(map: icn->regmap, reg, val: &pval);
241
242 *val = ret ? 0 : pval & 0xff;
243}
244
245static int chipone_writeb(struct chipone *icn, u8 reg, u8 val)
246{
247 return regmap_write(map: icn->regmap, reg, val);
248}
249
250static 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 val: icn->refclk ? PLL_CTRL_6_EXTERNAL : PLL_CTRL_6_MIPI_CLK);
339 chipone_writeb(icn, PLL_REF_DIV, val: ref_div);
340 chipone_writeb(icn, PLL_INT(0), val: best_m);
341}
342
343static 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, val: id);
355 chipone_readb(icn, DEVICE_ID_H, val: id + 1);
356 chipone_readb(icn, DEVICE_ID_L, val: id + 2);
357 chipone_readb(icn, VERSION_ID, val: 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, val: mode->hdisplay & 0xff);
378
379 chipone_writeb(icn, VACTIVE_LI, val: 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 val: ((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, val: hfp & 0xff);
394 chipone_writeb(icn, HSYNC_LI, val: hsync & 0xff);
395 chipone_writeb(icn, HBP_LI, val: 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, val: mode->vsync_start - mode->vdisplay);
403
404 chipone_writeb(icn, VSYNC, val: mode->vsync_end - mode->vsync_start);
405
406 chipone_writeb(icn, VBP, val: mode->vtotal - mode->vsync_end);
407
408 /* dsi specific sequence */
409 chipone_writeb(icn, SYNC_EVENT_DLY, val: 0x80);
410 chipone_writeb(icn, HFP_MIN, val: 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, val: 0xa0);
417 chipone_writeb(icn, PLL_CTRL(12), val: 0xff);
418 chipone_writeb(icn, MIPI_PN_SWAP, val: 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, val: pol);
425
426 /* Configure PLL settings */
427 chipone_configure_pll(icn, mode);
428
429 chipone_writeb(icn, SYS_CTRL(0), val: 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), val: sys_ctrl_1);
438
439 /* icn6211 specific sequence */
440 chipone_writeb(icn, MIPI_FORCE_0, val: 0x20);
441 chipone_writeb(icn, PLL_CTRL(1), val: 0x20);
442 chipone_writeb(icn, CONFIG_FINISH, val: 0x10);
443
444 usleep_range(min: 10000, max: 11000);
445}
446
447static 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(regulator: 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(regulator: 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(regulator: 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(clk: 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(desc: icn->enable_gpio, value: 1);
480
481 usleep_range(min: 10000, max: 11000);
482}
483
484static 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(clk: icn->refclk);
490
491 if (icn->vdd1)
492 regulator_disable(regulator: icn->vdd1);
493
494 if (icn->vdd2)
495 regulator_disable(regulator: icn->vdd2);
496
497 if (icn->vdd3)
498 regulator_disable(regulator: icn->vdd3);
499
500 gpiod_set_value(desc: icn->enable_gpio, value: 0);
501}
502
503static 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(dst: &icn->mode, src: adjusted_mode);
510};
511
512static 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(port: dev->of_node, port_reg: 0, reg: 0, min: 1, max: 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
542static 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(parent: dev->of_node, port_reg: 0, reg: 0);
558 host_node = of_graph_get_remote_port_parent(node: endpoint);
559 of_node_put(node: endpoint);
560
561 if (!host_node)
562 return -EINVAL;
563
564 host = of_find_mipi_dsi_host_by_node(node: host_node);
565 of_node_put(node: host_node);
566 if (!host) {
567 dev_err(dev, "failed to find dsi host\n");
568 return -EPROBE_DEFER;
569 }
570
571 dsi = mipi_dsi_device_register_full(host, info: &info);
572 if (IS_ERR(ptr: dsi)) {
573 return dev_err_probe(dev, err: PTR_ERR(ptr: dsi),
574 fmt: "failed to create dsi device\n");
575 }
576
577 icn->dsi = dsi;
578
579 ret = chipone_dsi_attach(icn);
580 if (ret < 0)
581 mipi_dsi_device_unregister(dsi);
582
583 return ret;
584}
585
586static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
587{
588 struct chipone *icn = bridge_to_chipone(bridge);
589
590 return drm_bridge_attach(encoder: bridge->encoder, bridge: icn->panel_bridge, previous: bridge, flags);
591}
592
593#define MAX_INPUT_SEL_FORMATS 1
594
595static u32 *
596chipone_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
597 struct drm_bridge_state *bridge_state,
598 struct drm_crtc_state *crtc_state,
599 struct drm_connector_state *conn_state,
600 u32 output_fmt,
601 unsigned int *num_input_fmts)
602{
603 u32 *input_fmts;
604
605 *num_input_fmts = 0;
606
607 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, size: sizeof(*input_fmts),
608 GFP_KERNEL);
609 if (!input_fmts)
610 return NULL;
611
612 /* This is the DSI-end bus format */
613 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
614 *num_input_fmts = 1;
615
616 return input_fmts;
617}
618
619static const struct drm_bridge_funcs chipone_bridge_funcs = {
620 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
621 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
622 .atomic_reset = drm_atomic_helper_bridge_reset,
623 .atomic_pre_enable = chipone_atomic_pre_enable,
624 .atomic_enable = chipone_atomic_enable,
625 .atomic_post_disable = chipone_atomic_post_disable,
626 .mode_set = chipone_mode_set,
627 .attach = chipone_attach,
628 .atomic_get_input_bus_fmts = chipone_atomic_get_input_bus_fmts,
629};
630
631static int chipone_parse_dt(struct chipone *icn)
632{
633 struct device *dev = icn->dev;
634 int ret;
635
636 icn->refclk = devm_clk_get_optional(dev, id: "refclk");
637 if (IS_ERR(ptr: icn->refclk)) {
638 ret = PTR_ERR(ptr: icn->refclk);
639 DRM_DEV_ERROR(dev, "failed to get REFCLK clock: %d\n", ret);
640 return ret;
641 } else if (icn->refclk) {
642 icn->refclk_rate = clk_get_rate(clk: icn->refclk);
643 if (icn->refclk_rate < 10000000 || icn->refclk_rate > 154000000) {
644 DRM_DEV_ERROR(dev, "REFCLK out of range: %ld Hz\n",
645 icn->refclk_rate);
646 return -EINVAL;
647 }
648 }
649
650 icn->vdd1 = devm_regulator_get_optional(dev, id: "vdd1");
651 if (IS_ERR(ptr: icn->vdd1)) {
652 ret = PTR_ERR(ptr: icn->vdd1);
653 if (ret == -EPROBE_DEFER)
654 return -EPROBE_DEFER;
655 icn->vdd1 = NULL;
656 DRM_DEV_DEBUG(dev, "failed to get VDD1 regulator: %d\n", ret);
657 }
658
659 icn->vdd2 = devm_regulator_get_optional(dev, id: "vdd2");
660 if (IS_ERR(ptr: icn->vdd2)) {
661 ret = PTR_ERR(ptr: icn->vdd2);
662 if (ret == -EPROBE_DEFER)
663 return -EPROBE_DEFER;
664 icn->vdd2 = NULL;
665 DRM_DEV_DEBUG(dev, "failed to get VDD2 regulator: %d\n", ret);
666 }
667
668 icn->vdd3 = devm_regulator_get_optional(dev, id: "vdd3");
669 if (IS_ERR(ptr: icn->vdd3)) {
670 ret = PTR_ERR(ptr: icn->vdd3);
671 if (ret == -EPROBE_DEFER)
672 return -EPROBE_DEFER;
673 icn->vdd3 = NULL;
674 DRM_DEV_DEBUG(dev, "failed to get VDD3 regulator: %d\n", ret);
675 }
676
677 icn->enable_gpio = devm_gpiod_get(dev, con_id: "enable", flags: GPIOD_OUT_LOW);
678 if (IS_ERR(ptr: icn->enable_gpio)) {
679 DRM_DEV_ERROR(dev, "failed to get enable GPIO\n");
680 return PTR_ERR(ptr: icn->enable_gpio);
681 }
682
683 icn->panel_bridge = devm_drm_of_get_bridge(dev, node: dev->of_node, port: 1, endpoint: 0);
684 if (IS_ERR(ptr: icn->panel_bridge))
685 return PTR_ERR(ptr: icn->panel_bridge);
686
687 return 0;
688}
689
690static int chipone_common_probe(struct device *dev, struct chipone **icnr)
691{
692 struct chipone *icn;
693 int ret;
694
695 icn = devm_kzalloc(dev, size: sizeof(struct chipone), GFP_KERNEL);
696 if (!icn)
697 return -ENOMEM;
698
699 icn->dev = dev;
700
701 ret = chipone_parse_dt(icn);
702 if (ret)
703 return ret;
704
705 icn->bridge.funcs = &chipone_bridge_funcs;
706 icn->bridge.type = DRM_MODE_CONNECTOR_DPI;
707 icn->bridge.of_node = dev->of_node;
708
709 *icnr = icn;
710
711 return ret;
712}
713
714static int chipone_dsi_probe(struct mipi_dsi_device *dsi)
715{
716 struct device *dev = &dsi->dev;
717 struct chipone *icn;
718 int ret;
719
720 ret = chipone_common_probe(dev, icnr: &icn);
721 if (ret)
722 return ret;
723
724 icn->regmap = devm_regmap_init(dev, &chipone_dsi_regmap_bus,
725 dsi, &chipone_regmap_config);
726 if (IS_ERR(ptr: icn->regmap))
727 return PTR_ERR(ptr: icn->regmap);
728
729 icn->interface_i2c = false;
730 icn->dsi = dsi;
731
732 mipi_dsi_set_drvdata(dsi, data: icn);
733
734 drm_bridge_add(bridge: &icn->bridge);
735
736 ret = chipone_dsi_attach(icn);
737 if (ret)
738 drm_bridge_remove(bridge: &icn->bridge);
739
740 return ret;
741}
742
743static int chipone_i2c_probe(struct i2c_client *client)
744{
745 struct device *dev = &client->dev;
746 struct chipone *icn;
747 int ret;
748
749 ret = chipone_common_probe(dev, icnr: &icn);
750 if (ret)
751 return ret;
752
753 icn->regmap = devm_regmap_init_i2c(client, &chipone_regmap_config);
754 if (IS_ERR(ptr: icn->regmap))
755 return PTR_ERR(ptr: icn->regmap);
756
757 icn->interface_i2c = true;
758 icn->client = client;
759 dev_set_drvdata(dev, data: icn);
760 i2c_set_clientdata(client, data: icn);
761
762 drm_bridge_add(bridge: &icn->bridge);
763
764 return chipone_dsi_host_attach(icn);
765}
766
767static void chipone_dsi_remove(struct mipi_dsi_device *dsi)
768{
769 struct chipone *icn = mipi_dsi_get_drvdata(dsi);
770
771 mipi_dsi_detach(dsi);
772 drm_bridge_remove(bridge: &icn->bridge);
773}
774
775static const struct of_device_id chipone_of_match[] = {
776 { .compatible = "chipone,icn6211", },
777 { /* sentinel */ }
778};
779MODULE_DEVICE_TABLE(of, chipone_of_match);
780
781static struct mipi_dsi_driver chipone_dsi_driver = {
782 .probe = chipone_dsi_probe,
783 .remove = chipone_dsi_remove,
784 .driver = {
785 .name = "chipone-icn6211",
786 .owner = THIS_MODULE,
787 .of_match_table = chipone_of_match,
788 },
789};
790
791static struct i2c_device_id chipone_i2c_id[] = {
792 { "chipone,icn6211" },
793 {},
794};
795MODULE_DEVICE_TABLE(i2c, chipone_i2c_id);
796
797static struct i2c_driver chipone_i2c_driver = {
798 .probe = chipone_i2c_probe,
799 .id_table = chipone_i2c_id,
800 .driver = {
801 .name = "chipone-icn6211-i2c",
802 .of_match_table = chipone_of_match,
803 },
804};
805
806static int __init chipone_init(void)
807{
808 if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
809 mipi_dsi_driver_register(&chipone_dsi_driver);
810
811 return i2c_add_driver(&chipone_i2c_driver);
812}
813module_init(chipone_init);
814
815static void __exit chipone_exit(void)
816{
817 i2c_del_driver(driver: &chipone_i2c_driver);
818
819 if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
820 mipi_dsi_driver_unregister(driver: &chipone_dsi_driver);
821}
822module_exit(chipone_exit);
823
824MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
825MODULE_DESCRIPTION("Chipone ICN6211 MIPI-DSI to RGB Converter Bridge");
826MODULE_LICENSE("GPL");
827

source code of linux/drivers/gpu/drm/bridge/chipone-icn6211.c