drm/bridge: sn65dsi83: Fix bridge removal
[linux-2.6-microblaze.git] / drivers / gpu / drm / bridge / ti-sn65dsi83.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * TI SN65DSI83,84,85 driver
4  *
5  * Currently supported:
6  * - SN65DSI83
7  *   = 1x Single-link DSI ~ 1x Single-link LVDS
8  *   - Supported
9  *   - Single-link LVDS mode tested
10  * - SN65DSI84
11  *   = 1x Single-link DSI ~ 2x Single-link or 1x Dual-link LVDS
12  *   - Supported
13  *   - Dual-link LVDS mode tested
14  *   - 2x Single-link LVDS mode unsupported
15  *     (should be easy to add by someone who has the HW)
16  * - SN65DSI85
17  *   = 2x Single-link or 1x Dual-link DSI ~ 2x Single-link or 1x Dual-link LVDS
18  *   - Unsupported
19  *     (should be easy to add by someone who has the HW)
20  *
21  * Copyright (C) 2021 Marek Vasut <marex@denx.de>
22  *
23  * Based on previous work of:
24  * Valentin Raevsky <valentin@compulab.co.il>
25  * Philippe Schenker <philippe.schenker@toradex.com>
26  */
27
28 #include <linux/bits.h>
29 #include <linux/clk.h>
30 #include <linux/gpio/consumer.h>
31 #include <linux/i2c.h>
32 #include <linux/module.h>
33 #include <linux/of_device.h>
34 #include <linux/of_graph.h>
35 #include <linux/regmap.h>
36
37 #include <drm/drm_atomic_helper.h>
38 #include <drm/drm_bridge.h>
39 #include <drm/drm_mipi_dsi.h>
40 #include <drm/drm_of.h>
41 #include <drm/drm_panel.h>
42 #include <drm/drm_print.h>
43 #include <drm/drm_probe_helper.h>
44
45 /* ID registers */
46 #define REG_ID(n)                               (0x00 + (n))
47 /* Reset and clock registers */
48 #define REG_RC_RESET                            0x09
49 #define  REG_RC_RESET_SOFT_RESET                BIT(0)
50 #define REG_RC_LVDS_PLL                         0x0a
51 #define  REG_RC_LVDS_PLL_PLL_EN_STAT            BIT(7)
52 #define  REG_RC_LVDS_PLL_LVDS_CLK_RANGE(n)      (((n) & 0x7) << 1)
53 #define  REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY        BIT(0)
54 #define REG_RC_DSI_CLK                          0x0b
55 #define  REG_RC_DSI_CLK_DSI_CLK_DIVIDER(n)      (((n) & 0x1f) << 3)
56 #define  REG_RC_DSI_CLK_REFCLK_MULTIPLIER(n)    ((n) & 0x3)
57 #define REG_RC_PLL_EN                           0x0d
58 #define  REG_RC_PLL_EN_PLL_EN                   BIT(0)
59 /* DSI registers */
60 #define REG_DSI_LANE                            0x10
61 #define  REG_DSI_LANE_LEFT_RIGHT_PIXELS         BIT(7)  /* DSI85-only */
62 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_DUAL     0       /* DSI85-only */
63 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_2SINGLE  BIT(6)  /* DSI85-only */
64 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE   BIT(5)
65 #define  REG_DSI_LANE_CHA_DSI_LANES(n)          (((n) & 0x3) << 3)
66 #define  REG_DSI_LANE_CHB_DSI_LANES(n)          (((n) & 0x3) << 1)
67 #define  REG_DSI_LANE_SOT_ERR_TOL_DIS           BIT(0)
68 #define REG_DSI_EQ                              0x11
69 #define  REG_DSI_EQ_CHA_DSI_DATA_EQ(n)          (((n) & 0x3) << 6)
70 #define  REG_DSI_EQ_CHA_DSI_CLK_EQ(n)           (((n) & 0x3) << 2)
71 #define REG_DSI_CLK                             0x12
72 #define  REG_DSI_CLK_CHA_DSI_CLK_RANGE(n)       ((n) & 0xff)
73 /* LVDS registers */
74 #define REG_LVDS_FMT                            0x18
75 #define  REG_LVDS_FMT_DE_NEG_POLARITY           BIT(7)
76 #define  REG_LVDS_FMT_HS_NEG_POLARITY           BIT(6)
77 #define  REG_LVDS_FMT_VS_NEG_POLARITY           BIT(5)
78 #define  REG_LVDS_FMT_LVDS_LINK_CFG             BIT(4)  /* 0:AB 1:A-only */
79 #define  REG_LVDS_FMT_CHA_24BPP_MODE            BIT(3)
80 #define  REG_LVDS_FMT_CHB_24BPP_MODE            BIT(2)
81 #define  REG_LVDS_FMT_CHA_24BPP_FORMAT1         BIT(1)
82 #define  REG_LVDS_FMT_CHB_24BPP_FORMAT1         BIT(0)
83 #define REG_LVDS_VCOM                           0x19
84 #define  REG_LVDS_VCOM_CHA_LVDS_VOCM            BIT(6)
85 #define  REG_LVDS_VCOM_CHB_LVDS_VOCM            BIT(4)
86 #define  REG_LVDS_VCOM_CHA_LVDS_VOD_SWING(n)    (((n) & 0x3) << 2)
87 #define  REG_LVDS_VCOM_CHB_LVDS_VOD_SWING(n)    ((n) & 0x3)
88 #define REG_LVDS_LANE                           0x1a
89 #define  REG_LVDS_LANE_EVEN_ODD_SWAP            BIT(6)
90 #define  REG_LVDS_LANE_CHA_REVERSE_LVDS         BIT(5)
91 #define  REG_LVDS_LANE_CHB_REVERSE_LVDS         BIT(4)
92 #define  REG_LVDS_LANE_CHA_LVDS_TERM            BIT(1)
93 #define  REG_LVDS_LANE_CHB_LVDS_TERM            BIT(0)
94 #define REG_LVDS_CM                             0x1b
95 #define  REG_LVDS_CM_CHA_LVDS_CM_ADJUST(n)      (((n) & 0x3) << 4)
96 #define  REG_LVDS_CM_CHB_LVDS_CM_ADJUST(n)      ((n) & 0x3)
97 /* Video registers */
98 #define REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW      0x20
99 #define REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH     0x21
100 #define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW   0x24
101 #define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH  0x25
102 #define REG_VID_CHA_SYNC_DELAY_LOW              0x28
103 #define REG_VID_CHA_SYNC_DELAY_HIGH             0x29
104 #define REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW       0x2c
105 #define REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH      0x2d
106 #define REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW       0x30
107 #define REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH      0x31
108 #define REG_VID_CHA_HORIZONTAL_BACK_PORCH       0x34
109 #define REG_VID_CHA_VERTICAL_BACK_PORCH         0x36
110 #define REG_VID_CHA_HORIZONTAL_FRONT_PORCH      0x38
111 #define REG_VID_CHA_VERTICAL_FRONT_PORCH        0x3a
112 #define REG_VID_CHA_TEST_PATTERN                0x3c
113 /* IRQ registers */
114 #define REG_IRQ_GLOBAL                          0xe0
115 #define  REG_IRQ_GLOBAL_IRQ_EN                  BIT(0)
116 #define REG_IRQ_EN                              0xe1
117 #define  REG_IRQ_EN_CHA_SYNCH_ERR_EN            BIT(7)
118 #define  REG_IRQ_EN_CHA_CRC_ERR_EN              BIT(6)
119 #define  REG_IRQ_EN_CHA_UNC_ECC_ERR_EN          BIT(5)
120 #define  REG_IRQ_EN_CHA_COR_ECC_ERR_EN          BIT(4)
121 #define  REG_IRQ_EN_CHA_LLP_ERR_EN              BIT(3)
122 #define  REG_IRQ_EN_CHA_SOT_BIT_ERR_EN          BIT(2)
123 #define  REG_IRQ_EN_CHA_PLL_UNLOCK_EN           BIT(0)
124 #define REG_IRQ_STAT                            0xe5
125 #define  REG_IRQ_STAT_CHA_SYNCH_ERR             BIT(7)
126 #define  REG_IRQ_STAT_CHA_CRC_ERR               BIT(6)
127 #define  REG_IRQ_STAT_CHA_UNC_ECC_ERR           BIT(5)
128 #define  REG_IRQ_STAT_CHA_COR_ECC_ERR           BIT(4)
129 #define  REG_IRQ_STAT_CHA_LLP_ERR               BIT(3)
130 #define  REG_IRQ_STAT_CHA_SOT_BIT_ERR           BIT(2)
131 #define  REG_IRQ_STAT_CHA_PLL_UNLOCK            BIT(0)
132
133 enum sn65dsi83_model {
134         MODEL_SN65DSI83,
135         MODEL_SN65DSI84,
136 };
137
138 struct sn65dsi83 {
139         struct drm_bridge               bridge;
140         struct device                   *dev;
141         struct regmap                   *regmap;
142         struct device_node              *host_node;
143         struct mipi_dsi_device          *dsi;
144         struct drm_bridge               *panel_bridge;
145         struct gpio_desc                *enable_gpio;
146         int                             dsi_lanes;
147         bool                            lvds_dual_link;
148         bool                            lvds_dual_link_even_odd_swap;
149 };
150
151 static const struct regmap_range sn65dsi83_readable_ranges[] = {
152         regmap_reg_range(REG_ID(0), REG_ID(8)),
153         regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_DSI_CLK),
154         regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
155         regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
156         regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
157         regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
158                          REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
159         regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
160                          REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
161         regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
162                          REG_VID_CHA_SYNC_DELAY_HIGH),
163         regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
164                          REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
165         regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
166                          REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
167         regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
168                          REG_VID_CHA_HORIZONTAL_BACK_PORCH),
169         regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
170                          REG_VID_CHA_VERTICAL_BACK_PORCH),
171         regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
172                          REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
173         regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
174                          REG_VID_CHA_VERTICAL_FRONT_PORCH),
175         regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
176         regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
177         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
178 };
179
180 static const struct regmap_access_table sn65dsi83_readable_table = {
181         .yes_ranges = sn65dsi83_readable_ranges,
182         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_readable_ranges),
183 };
184
185 static const struct regmap_range sn65dsi83_writeable_ranges[] = {
186         regmap_reg_range(REG_RC_RESET, REG_RC_DSI_CLK),
187         regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
188         regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
189         regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
190         regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
191                          REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
192         regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
193                          REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
194         regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
195                          REG_VID_CHA_SYNC_DELAY_HIGH),
196         regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
197                          REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
198         regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
199                          REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
200         regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
201                          REG_VID_CHA_HORIZONTAL_BACK_PORCH),
202         regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
203                          REG_VID_CHA_VERTICAL_BACK_PORCH),
204         regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
205                          REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
206         regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
207                          REG_VID_CHA_VERTICAL_FRONT_PORCH),
208         regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
209         regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
210         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
211 };
212
213 static const struct regmap_access_table sn65dsi83_writeable_table = {
214         .yes_ranges = sn65dsi83_writeable_ranges,
215         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_writeable_ranges),
216 };
217
218 static const struct regmap_range sn65dsi83_volatile_ranges[] = {
219         regmap_reg_range(REG_RC_RESET, REG_RC_RESET),
220         regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_LVDS_PLL),
221         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
222 };
223
224 static const struct regmap_access_table sn65dsi83_volatile_table = {
225         .yes_ranges = sn65dsi83_volatile_ranges,
226         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_volatile_ranges),
227 };
228
229 static const struct regmap_config sn65dsi83_regmap_config = {
230         .reg_bits = 8,
231         .val_bits = 8,
232         .rd_table = &sn65dsi83_readable_table,
233         .wr_table = &sn65dsi83_writeable_table,
234         .volatile_table = &sn65dsi83_volatile_table,
235         .cache_type = REGCACHE_RBTREE,
236         .max_register = REG_IRQ_STAT,
237 };
238
239 static struct sn65dsi83 *bridge_to_sn65dsi83(struct drm_bridge *bridge)
240 {
241         return container_of(bridge, struct sn65dsi83, bridge);
242 }
243
244 static int sn65dsi83_attach(struct drm_bridge *bridge,
245                             enum drm_bridge_attach_flags flags)
246 {
247         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
248         struct device *dev = ctx->dev;
249         struct mipi_dsi_device *dsi;
250         struct mipi_dsi_host *host;
251         int ret = 0;
252
253         const struct mipi_dsi_device_info info = {
254                 .type = "sn65dsi83",
255                 .channel = 0,
256                 .node = NULL,
257         };
258
259         host = of_find_mipi_dsi_host_by_node(ctx->host_node);
260         if (!host) {
261                 dev_err(dev, "failed to find dsi host\n");
262                 return -EPROBE_DEFER;
263         }
264
265         dsi = mipi_dsi_device_register_full(host, &info);
266         if (IS_ERR(dsi)) {
267                 return dev_err_probe(dev, PTR_ERR(dsi),
268                                      "failed to create dsi device\n");
269         }
270
271         ctx->dsi = dsi;
272
273         dsi->lanes = ctx->dsi_lanes;
274         dsi->format = MIPI_DSI_FMT_RGB888;
275         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
276
277         ret = mipi_dsi_attach(dsi);
278         if (ret < 0) {
279                 dev_err(dev, "failed to attach dsi to host\n");
280                 goto err_dsi_attach;
281         }
282
283         return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
284                                  &ctx->bridge, flags);
285
286 err_dsi_attach:
287         mipi_dsi_device_unregister(dsi);
288         return ret;
289 }
290
291 static void sn65dsi83_detach(struct drm_bridge *bridge)
292 {
293         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
294
295         if (!ctx->dsi)
296                 return;
297
298         mipi_dsi_detach(ctx->dsi);
299         mipi_dsi_device_unregister(ctx->dsi);
300         ctx->dsi = NULL;
301 }
302
303 static u8 sn65dsi83_get_lvds_range(struct sn65dsi83 *ctx,
304                                    const struct drm_display_mode *mode)
305 {
306         /*
307          * The encoding of the LVDS_CLK_RANGE is as follows:
308          * 000 - 25 MHz <= LVDS_CLK < 37.5 MHz
309          * 001 - 37.5 MHz <= LVDS_CLK < 62.5 MHz
310          * 010 - 62.5 MHz <= LVDS_CLK < 87.5 MHz
311          * 011 - 87.5 MHz <= LVDS_CLK < 112.5 MHz
312          * 100 - 112.5 MHz <= LVDS_CLK < 137.5 MHz
313          * 101 - 137.5 MHz <= LVDS_CLK <= 154 MHz
314          * which is a range of 12.5MHz..162.5MHz in 50MHz steps, except that
315          * the ends of the ranges are clamped to the supported range. Since
316          * sn65dsi83_mode_valid() already filters the valid modes and limits
317          * the clock to 25..154 MHz, the range calculation can be simplified
318          * as follows:
319          */
320         int mode_clock = mode->clock;
321
322         if (ctx->lvds_dual_link)
323                 mode_clock /= 2;
324
325         return (mode_clock - 12500) / 25000;
326 }
327
328 static u8 sn65dsi83_get_dsi_range(struct sn65dsi83 *ctx,
329                                   const struct drm_display_mode *mode)
330 {
331         /*
332          * The encoding of the CHA_DSI_CLK_RANGE is as follows:
333          * 0x00 through 0x07 - Reserved
334          * 0x08 - 40 <= DSI_CLK < 45 MHz
335          * 0x09 - 45 <= DSI_CLK < 50 MHz
336          * ...
337          * 0x63 - 495 <= DSI_CLK < 500 MHz
338          * 0x64 - 500 MHz
339          * 0x65 through 0xFF - Reserved
340          * which is DSI clock in 5 MHz steps, clamped to 40..500 MHz.
341          * The DSI clock are calculated as:
342          *  DSI_CLK = mode clock * bpp / dsi_data_lanes / 2
343          * the 2 is there because the bus is DDR.
344          */
345         return DIV_ROUND_UP(clamp((unsigned int)mode->clock *
346                             mipi_dsi_pixel_format_to_bpp(ctx->dsi->format) /
347                             ctx->dsi_lanes / 2, 40000U, 500000U), 5000U);
348 }
349
350 static u8 sn65dsi83_get_dsi_div(struct sn65dsi83 *ctx)
351 {
352         /* The divider is (DSI_CLK / LVDS_CLK) - 1, which really is: */
353         unsigned int dsi_div = mipi_dsi_pixel_format_to_bpp(ctx->dsi->format);
354
355         dsi_div /= ctx->dsi_lanes;
356
357         if (!ctx->lvds_dual_link)
358                 dsi_div /= 2;
359
360         return dsi_div - 1;
361 }
362
363 static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
364                                     struct drm_bridge_state *old_bridge_state)
365 {
366         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
367         struct drm_atomic_state *state = old_bridge_state->base.state;
368         const struct drm_bridge_state *bridge_state;
369         const struct drm_crtc_state *crtc_state;
370         const struct drm_display_mode *mode;
371         struct drm_connector *connector;
372         struct drm_crtc *crtc;
373         bool lvds_format_24bpp;
374         bool lvds_format_jeida;
375         unsigned int pval;
376         __le16 le16val;
377         u16 val;
378         int ret;
379
380         /* Deassert reset */
381         gpiod_set_value(ctx->enable_gpio, 1);
382         usleep_range(1000, 1100);
383
384         /* Get the LVDS format from the bridge state. */
385         bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
386
387         switch (bridge_state->output_bus_cfg.format) {
388         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
389                 lvds_format_24bpp = false;
390                 lvds_format_jeida = true;
391                 break;
392         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
393                 lvds_format_24bpp = true;
394                 lvds_format_jeida = true;
395                 break;
396         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
397                 lvds_format_24bpp = true;
398                 lvds_format_jeida = false;
399                 break;
400         default:
401                 /*
402                  * Some bridges still don't set the correct
403                  * LVDS bus pixel format, use SPWG24 default
404                  * format until those are fixed.
405                  */
406                 lvds_format_24bpp = true;
407                 lvds_format_jeida = false;
408                 dev_warn(ctx->dev,
409                          "Unsupported LVDS bus format 0x%04x, please check output bridge driver. Falling back to SPWG24.\n",
410                          bridge_state->output_bus_cfg.format);
411                 break;
412         }
413
414         /*
415          * Retrieve the CRTC adjusted mode. This requires a little dance to go
416          * from the bridge to the encoder, to the connector and to the CRTC.
417          */
418         connector = drm_atomic_get_new_connector_for_encoder(state,
419                                                              bridge->encoder);
420         crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
421         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
422         mode = &crtc_state->adjusted_mode;
423
424         /* Clear reset, disable PLL */
425         regmap_write(ctx->regmap, REG_RC_RESET, 0x00);
426         regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
427
428         /* Reference clock derived from DSI link clock. */
429         regmap_write(ctx->regmap, REG_RC_LVDS_PLL,
430                      REG_RC_LVDS_PLL_LVDS_CLK_RANGE(sn65dsi83_get_lvds_range(ctx, mode)) |
431                      REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY);
432         regmap_write(ctx->regmap, REG_DSI_CLK,
433                      REG_DSI_CLK_CHA_DSI_CLK_RANGE(sn65dsi83_get_dsi_range(ctx, mode)));
434         regmap_write(ctx->regmap, REG_RC_DSI_CLK,
435                      REG_RC_DSI_CLK_DSI_CLK_DIVIDER(sn65dsi83_get_dsi_div(ctx)));
436
437         /* Set number of DSI lanes and LVDS link config. */
438         regmap_write(ctx->regmap, REG_DSI_LANE,
439                      REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE |
440                      REG_DSI_LANE_CHA_DSI_LANES(~(ctx->dsi_lanes - 1)) |
441                      /* CHB is DSI85-only, set to default on DSI83/DSI84 */
442                      REG_DSI_LANE_CHB_DSI_LANES(3));
443         /* No equalization. */
444         regmap_write(ctx->regmap, REG_DSI_EQ, 0x00);
445
446         /* Set up sync signal polarity. */
447         val = (mode->flags & DRM_MODE_FLAG_NHSYNC ?
448                REG_LVDS_FMT_HS_NEG_POLARITY : 0) |
449               (mode->flags & DRM_MODE_FLAG_NVSYNC ?
450                REG_LVDS_FMT_VS_NEG_POLARITY : 0);
451
452         /* Set up bits-per-pixel, 18bpp or 24bpp. */
453         if (lvds_format_24bpp) {
454                 val |= REG_LVDS_FMT_CHA_24BPP_MODE;
455                 if (ctx->lvds_dual_link)
456                         val |= REG_LVDS_FMT_CHB_24BPP_MODE;
457         }
458
459         /* Set up LVDS format, JEIDA/Format 1 or SPWG/Format 2 */
460         if (lvds_format_jeida) {
461                 val |= REG_LVDS_FMT_CHA_24BPP_FORMAT1;
462                 if (ctx->lvds_dual_link)
463                         val |= REG_LVDS_FMT_CHB_24BPP_FORMAT1;
464         }
465
466         /* Set up LVDS output config (DSI84,DSI85) */
467         if (!ctx->lvds_dual_link)
468                 val |= REG_LVDS_FMT_LVDS_LINK_CFG;
469
470         regmap_write(ctx->regmap, REG_LVDS_FMT, val);
471         regmap_write(ctx->regmap, REG_LVDS_VCOM, 0x05);
472         regmap_write(ctx->regmap, REG_LVDS_LANE,
473                      (ctx->lvds_dual_link_even_odd_swap ?
474                       REG_LVDS_LANE_EVEN_ODD_SWAP : 0) |
475                      REG_LVDS_LANE_CHA_LVDS_TERM |
476                      REG_LVDS_LANE_CHB_LVDS_TERM);
477         regmap_write(ctx->regmap, REG_LVDS_CM, 0x00);
478
479         le16val = cpu_to_le16(mode->hdisplay);
480         regmap_bulk_write(ctx->regmap, REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
481                           &le16val, 2);
482         le16val = cpu_to_le16(mode->vdisplay);
483         regmap_bulk_write(ctx->regmap, REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
484                           &le16val, 2);
485         /* 32 + 1 pixel clock to ensure proper operation */
486         le16val = cpu_to_le16(32 + 1);
487         regmap_bulk_write(ctx->regmap, REG_VID_CHA_SYNC_DELAY_LOW, &le16val, 2);
488         le16val = cpu_to_le16(mode->hsync_end - mode->hsync_start);
489         regmap_bulk_write(ctx->regmap, REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
490                           &le16val, 2);
491         le16val = cpu_to_le16(mode->vsync_end - mode->vsync_start);
492         regmap_bulk_write(ctx->regmap, REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
493                           &le16val, 2);
494         regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_BACK_PORCH,
495                      mode->htotal - mode->hsync_end);
496         regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_BACK_PORCH,
497                      mode->vtotal - mode->vsync_end);
498         regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
499                      mode->hsync_start - mode->hdisplay);
500         regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_FRONT_PORCH,
501                      mode->vsync_start - mode->vdisplay);
502         regmap_write(ctx->regmap, REG_VID_CHA_TEST_PATTERN, 0x00);
503
504         /* Enable PLL */
505         regmap_write(ctx->regmap, REG_RC_PLL_EN, REG_RC_PLL_EN_PLL_EN);
506         usleep_range(3000, 4000);
507         ret = regmap_read_poll_timeout(ctx->regmap, REG_RC_LVDS_PLL, pval,
508                                        pval & REG_RC_LVDS_PLL_PLL_EN_STAT,
509                                        1000, 100000);
510         if (ret) {
511                 dev_err(ctx->dev, "failed to lock PLL, ret=%i\n", ret);
512                 /* On failure, disable PLL again and exit. */
513                 regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
514                 return;
515         }
516
517         /* Trigger reset after CSR register update. */
518         regmap_write(ctx->regmap, REG_RC_RESET, REG_RC_RESET_SOFT_RESET);
519
520         /* Clear all errors that got asserted during initialization. */
521         regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
522         regmap_write(ctx->regmap, REG_IRQ_STAT, pval);
523 }
524
525 static void sn65dsi83_atomic_disable(struct drm_bridge *bridge,
526                                      struct drm_bridge_state *old_bridge_state)
527 {
528         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
529
530         /* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
531         gpiod_set_value(ctx->enable_gpio, 0);
532         usleep_range(10000, 11000);
533
534         regcache_mark_dirty(ctx->regmap);
535 }
536
537 static enum drm_mode_status
538 sn65dsi83_mode_valid(struct drm_bridge *bridge,
539                      const struct drm_display_info *info,
540                      const struct drm_display_mode *mode)
541 {
542         /* LVDS output clock range 25..154 MHz */
543         if (mode->clock < 25000)
544                 return MODE_CLOCK_LOW;
545         if (mode->clock > 154000)
546                 return MODE_CLOCK_HIGH;
547
548         return MODE_OK;
549 }
550
551 #define MAX_INPUT_SEL_FORMATS   1
552
553 static u32 *
554 sn65dsi83_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
555                                     struct drm_bridge_state *bridge_state,
556                                     struct drm_crtc_state *crtc_state,
557                                     struct drm_connector_state *conn_state,
558                                     u32 output_fmt,
559                                     unsigned int *num_input_fmts)
560 {
561         u32 *input_fmts;
562
563         *num_input_fmts = 0;
564
565         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
566                              GFP_KERNEL);
567         if (!input_fmts)
568                 return NULL;
569
570         /* This is the DSI-end bus format */
571         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
572         *num_input_fmts = 1;
573
574         return input_fmts;
575 }
576
577 static const struct drm_bridge_funcs sn65dsi83_funcs = {
578         .attach                 = sn65dsi83_attach,
579         .detach                 = sn65dsi83_detach,
580         .atomic_enable          = sn65dsi83_atomic_enable,
581         .atomic_disable         = sn65dsi83_atomic_disable,
582         .mode_valid             = sn65dsi83_mode_valid,
583
584         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
585         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
586         .atomic_reset = drm_atomic_helper_bridge_reset,
587         .atomic_get_input_bus_fmts = sn65dsi83_atomic_get_input_bus_fmts,
588 };
589
590 static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
591 {
592         struct drm_bridge *panel_bridge;
593         struct device *dev = ctx->dev;
594         struct device_node *endpoint;
595         struct drm_panel *panel;
596         int ret;
597
598         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
599         ctx->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
600         ctx->host_node = of_graph_get_remote_port_parent(endpoint);
601         of_node_put(endpoint);
602
603         if (ctx->dsi_lanes < 0 || ctx->dsi_lanes > 4)
604                 return -EINVAL;
605         if (!ctx->host_node)
606                 return -ENODEV;
607
608         ctx->lvds_dual_link = false;
609         ctx->lvds_dual_link_even_odd_swap = false;
610         if (model != MODEL_SN65DSI83) {
611                 struct device_node *port2, *port3;
612                 int dual_link;
613
614                 port2 = of_graph_get_port_by_id(dev->of_node, 2);
615                 port3 = of_graph_get_port_by_id(dev->of_node, 3);
616                 dual_link = drm_of_lvds_get_dual_link_pixel_order(port2, port3);
617                 of_node_put(port2);
618                 of_node_put(port3);
619
620                 if (dual_link == DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS) {
621                         ctx->lvds_dual_link = true;
622                         /* Odd pixels to LVDS Channel A, even pixels to B */
623                         ctx->lvds_dual_link_even_odd_swap = false;
624                 } else if (dual_link == DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS) {
625                         ctx->lvds_dual_link = true;
626                         /* Even pixels to LVDS Channel A, odd pixels to B */
627                         ctx->lvds_dual_link_even_odd_swap = true;
628                 }
629         }
630
631         ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &panel, &panel_bridge);
632         if (ret < 0)
633                 return ret;
634         if (panel) {
635                 panel_bridge = devm_drm_panel_bridge_add(dev, panel);
636                 if (IS_ERR(panel_bridge))
637                         return PTR_ERR(panel_bridge);
638         }
639
640         ctx->panel_bridge = panel_bridge;
641
642         return 0;
643 }
644
645 static int sn65dsi83_probe(struct i2c_client *client,
646                            const struct i2c_device_id *id)
647 {
648         struct device *dev = &client->dev;
649         enum sn65dsi83_model model;
650         struct sn65dsi83 *ctx;
651         int ret;
652
653         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
654         if (!ctx)
655                 return -ENOMEM;
656
657         ctx->dev = dev;
658
659         if (dev->of_node) {
660                 model = (enum sn65dsi83_model)(uintptr_t)
661                         of_device_get_match_data(dev);
662         } else {
663                 model = id->driver_data;
664         }
665
666         /* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
667         ctx->enable_gpio = devm_gpiod_get(ctx->dev, "enable", GPIOD_OUT_LOW);
668         if (IS_ERR(ctx->enable_gpio))
669                 return PTR_ERR(ctx->enable_gpio);
670
671         usleep_range(10000, 11000);
672
673         ret = sn65dsi83_parse_dt(ctx, model);
674         if (ret)
675                 return ret;
676
677         ctx->regmap = devm_regmap_init_i2c(client, &sn65dsi83_regmap_config);
678         if (IS_ERR(ctx->regmap))
679                 return PTR_ERR(ctx->regmap);
680
681         dev_set_drvdata(dev, ctx);
682         i2c_set_clientdata(client, ctx);
683
684         ctx->bridge.funcs = &sn65dsi83_funcs;
685         ctx->bridge.of_node = dev->of_node;
686         drm_bridge_add(&ctx->bridge);
687
688         return 0;
689 }
690
691 static int sn65dsi83_remove(struct i2c_client *client)
692 {
693         struct sn65dsi83 *ctx = i2c_get_clientdata(client);
694
695         drm_bridge_remove(&ctx->bridge);
696         of_node_put(ctx->host_node);
697
698         return 0;
699 }
700
701 static struct i2c_device_id sn65dsi83_id[] = {
702         { "ti,sn65dsi83", MODEL_SN65DSI83 },
703         { "ti,sn65dsi84", MODEL_SN65DSI84 },
704         {},
705 };
706 MODULE_DEVICE_TABLE(i2c, sn65dsi83_id);
707
708 static const struct of_device_id sn65dsi83_match_table[] = {
709         { .compatible = "ti,sn65dsi83", .data = (void *)MODEL_SN65DSI83 },
710         { .compatible = "ti,sn65dsi84", .data = (void *)MODEL_SN65DSI84 },
711         {},
712 };
713 MODULE_DEVICE_TABLE(of, sn65dsi83_match_table);
714
715 static struct i2c_driver sn65dsi83_driver = {
716         .probe = sn65dsi83_probe,
717         .remove = sn65dsi83_remove,
718         .id_table = sn65dsi83_id,
719         .driver = {
720                 .name = "sn65dsi83",
721                 .of_match_table = sn65dsi83_match_table,
722         },
723 };
724 module_i2c_driver(sn65dsi83_driver);
725
726 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
727 MODULE_DESCRIPTION("TI SN65DSI83 DSI to LVDS bridge driver");
728 MODULE_LICENSE("GPL v2");