KVM: selftests: Restrict test region to 48-bit physical addresses when using nested
[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 #include <linux/regulator/consumer.h>
37
38 #include <drm/drm_atomic_helper.h>
39 #include <drm/drm_bridge.h>
40 #include <drm/drm_mipi_dsi.h>
41 #include <drm/drm_of.h>
42 #include <drm/drm_panel.h>
43 #include <drm/drm_print.h>
44 #include <drm/drm_probe_helper.h>
45
46 /* ID registers */
47 #define REG_ID(n)                               (0x00 + (n))
48 /* Reset and clock registers */
49 #define REG_RC_RESET                            0x09
50 #define  REG_RC_RESET_SOFT_RESET                BIT(0)
51 #define REG_RC_LVDS_PLL                         0x0a
52 #define  REG_RC_LVDS_PLL_PLL_EN_STAT            BIT(7)
53 #define  REG_RC_LVDS_PLL_LVDS_CLK_RANGE(n)      (((n) & 0x7) << 1)
54 #define  REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY        BIT(0)
55 #define REG_RC_DSI_CLK                          0x0b
56 #define  REG_RC_DSI_CLK_DSI_CLK_DIVIDER(n)      (((n) & 0x1f) << 3)
57 #define  REG_RC_DSI_CLK_REFCLK_MULTIPLIER(n)    ((n) & 0x3)
58 #define REG_RC_PLL_EN                           0x0d
59 #define  REG_RC_PLL_EN_PLL_EN                   BIT(0)
60 /* DSI registers */
61 #define REG_DSI_LANE                            0x10
62 #define  REG_DSI_LANE_LEFT_RIGHT_PIXELS         BIT(7)  /* DSI85-only */
63 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_DUAL     0       /* DSI85-only */
64 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_2SINGLE  BIT(6)  /* DSI85-only */
65 #define  REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE   BIT(5)
66 #define  REG_DSI_LANE_CHA_DSI_LANES(n)          (((n) & 0x3) << 3)
67 #define  REG_DSI_LANE_CHB_DSI_LANES(n)          (((n) & 0x3) << 1)
68 #define  REG_DSI_LANE_SOT_ERR_TOL_DIS           BIT(0)
69 #define REG_DSI_EQ                              0x11
70 #define  REG_DSI_EQ_CHA_DSI_DATA_EQ(n)          (((n) & 0x3) << 6)
71 #define  REG_DSI_EQ_CHA_DSI_CLK_EQ(n)           (((n) & 0x3) << 2)
72 #define REG_DSI_CLK                             0x12
73 #define  REG_DSI_CLK_CHA_DSI_CLK_RANGE(n)       ((n) & 0xff)
74 /* LVDS registers */
75 #define REG_LVDS_FMT                            0x18
76 #define  REG_LVDS_FMT_DE_NEG_POLARITY           BIT(7)
77 #define  REG_LVDS_FMT_HS_NEG_POLARITY           BIT(6)
78 #define  REG_LVDS_FMT_VS_NEG_POLARITY           BIT(5)
79 #define  REG_LVDS_FMT_LVDS_LINK_CFG             BIT(4)  /* 0:AB 1:A-only */
80 #define  REG_LVDS_FMT_CHA_24BPP_MODE            BIT(3)
81 #define  REG_LVDS_FMT_CHB_24BPP_MODE            BIT(2)
82 #define  REG_LVDS_FMT_CHA_24BPP_FORMAT1         BIT(1)
83 #define  REG_LVDS_FMT_CHB_24BPP_FORMAT1         BIT(0)
84 #define REG_LVDS_VCOM                           0x19
85 #define  REG_LVDS_VCOM_CHA_LVDS_VOCM            BIT(6)
86 #define  REG_LVDS_VCOM_CHB_LVDS_VOCM            BIT(4)
87 #define  REG_LVDS_VCOM_CHA_LVDS_VOD_SWING(n)    (((n) & 0x3) << 2)
88 #define  REG_LVDS_VCOM_CHB_LVDS_VOD_SWING(n)    ((n) & 0x3)
89 #define REG_LVDS_LANE                           0x1a
90 #define  REG_LVDS_LANE_EVEN_ODD_SWAP            BIT(6)
91 #define  REG_LVDS_LANE_CHA_REVERSE_LVDS         BIT(5)
92 #define  REG_LVDS_LANE_CHB_REVERSE_LVDS         BIT(4)
93 #define  REG_LVDS_LANE_CHA_LVDS_TERM            BIT(1)
94 #define  REG_LVDS_LANE_CHB_LVDS_TERM            BIT(0)
95 #define REG_LVDS_CM                             0x1b
96 #define  REG_LVDS_CM_CHA_LVDS_CM_ADJUST(n)      (((n) & 0x3) << 4)
97 #define  REG_LVDS_CM_CHB_LVDS_CM_ADJUST(n)      ((n) & 0x3)
98 /* Video registers */
99 #define REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW      0x20
100 #define REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH     0x21
101 #define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW   0x24
102 #define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH  0x25
103 #define REG_VID_CHA_SYNC_DELAY_LOW              0x28
104 #define REG_VID_CHA_SYNC_DELAY_HIGH             0x29
105 #define REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW       0x2c
106 #define REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH      0x2d
107 #define REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW       0x30
108 #define REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH      0x31
109 #define REG_VID_CHA_HORIZONTAL_BACK_PORCH       0x34
110 #define REG_VID_CHA_VERTICAL_BACK_PORCH         0x36
111 #define REG_VID_CHA_HORIZONTAL_FRONT_PORCH      0x38
112 #define REG_VID_CHA_VERTICAL_FRONT_PORCH        0x3a
113 #define REG_VID_CHA_TEST_PATTERN                0x3c
114 /* IRQ registers */
115 #define REG_IRQ_GLOBAL                          0xe0
116 #define  REG_IRQ_GLOBAL_IRQ_EN                  BIT(0)
117 #define REG_IRQ_EN                              0xe1
118 #define  REG_IRQ_EN_CHA_SYNCH_ERR_EN            BIT(7)
119 #define  REG_IRQ_EN_CHA_CRC_ERR_EN              BIT(6)
120 #define  REG_IRQ_EN_CHA_UNC_ECC_ERR_EN          BIT(5)
121 #define  REG_IRQ_EN_CHA_COR_ECC_ERR_EN          BIT(4)
122 #define  REG_IRQ_EN_CHA_LLP_ERR_EN              BIT(3)
123 #define  REG_IRQ_EN_CHA_SOT_BIT_ERR_EN          BIT(2)
124 #define  REG_IRQ_EN_CHA_PLL_UNLOCK_EN           BIT(0)
125 #define REG_IRQ_STAT                            0xe5
126 #define  REG_IRQ_STAT_CHA_SYNCH_ERR             BIT(7)
127 #define  REG_IRQ_STAT_CHA_CRC_ERR               BIT(6)
128 #define  REG_IRQ_STAT_CHA_UNC_ECC_ERR           BIT(5)
129 #define  REG_IRQ_STAT_CHA_COR_ECC_ERR           BIT(4)
130 #define  REG_IRQ_STAT_CHA_LLP_ERR               BIT(3)
131 #define  REG_IRQ_STAT_CHA_SOT_BIT_ERR           BIT(2)
132 #define  REG_IRQ_STAT_CHA_PLL_UNLOCK            BIT(0)
133
134 enum sn65dsi83_model {
135         MODEL_SN65DSI83,
136         MODEL_SN65DSI84,
137 };
138
139 struct sn65dsi83 {
140         struct drm_bridge               bridge;
141         struct device                   *dev;
142         struct regmap                   *regmap;
143         struct device_node              *host_node;
144         struct mipi_dsi_device          *dsi;
145         struct drm_bridge               *panel_bridge;
146         struct gpio_desc                *enable_gpio;
147         struct regulator                *vcc;
148         int                             dsi_lanes;
149         bool                            lvds_dual_link;
150         bool                            lvds_dual_link_even_odd_swap;
151 };
152
153 static const struct regmap_range sn65dsi83_readable_ranges[] = {
154         regmap_reg_range(REG_ID(0), REG_ID(8)),
155         regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_DSI_CLK),
156         regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
157         regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
158         regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
159         regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
160                          REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
161         regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
162                          REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
163         regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
164                          REG_VID_CHA_SYNC_DELAY_HIGH),
165         regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
166                          REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
167         regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
168                          REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
169         regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
170                          REG_VID_CHA_HORIZONTAL_BACK_PORCH),
171         regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
172                          REG_VID_CHA_VERTICAL_BACK_PORCH),
173         regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
174                          REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
175         regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
176                          REG_VID_CHA_VERTICAL_FRONT_PORCH),
177         regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
178         regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
179         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
180 };
181
182 static const struct regmap_access_table sn65dsi83_readable_table = {
183         .yes_ranges = sn65dsi83_readable_ranges,
184         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_readable_ranges),
185 };
186
187 static const struct regmap_range sn65dsi83_writeable_ranges[] = {
188         regmap_reg_range(REG_RC_RESET, REG_RC_DSI_CLK),
189         regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
190         regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
191         regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
192         regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
193                          REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
194         regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
195                          REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
196         regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
197                          REG_VID_CHA_SYNC_DELAY_HIGH),
198         regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
199                          REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
200         regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
201                          REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
202         regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
203                          REG_VID_CHA_HORIZONTAL_BACK_PORCH),
204         regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
205                          REG_VID_CHA_VERTICAL_BACK_PORCH),
206         regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
207                          REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
208         regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
209                          REG_VID_CHA_VERTICAL_FRONT_PORCH),
210         regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
211         regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
212         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
213 };
214
215 static const struct regmap_access_table sn65dsi83_writeable_table = {
216         .yes_ranges = sn65dsi83_writeable_ranges,
217         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_writeable_ranges),
218 };
219
220 static const struct regmap_range sn65dsi83_volatile_ranges[] = {
221         regmap_reg_range(REG_RC_RESET, REG_RC_RESET),
222         regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_LVDS_PLL),
223         regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
224 };
225
226 static const struct regmap_access_table sn65dsi83_volatile_table = {
227         .yes_ranges = sn65dsi83_volatile_ranges,
228         .n_yes_ranges = ARRAY_SIZE(sn65dsi83_volatile_ranges),
229 };
230
231 static const struct regmap_config sn65dsi83_regmap_config = {
232         .reg_bits = 8,
233         .val_bits = 8,
234         .rd_table = &sn65dsi83_readable_table,
235         .wr_table = &sn65dsi83_writeable_table,
236         .volatile_table = &sn65dsi83_volatile_table,
237         .cache_type = REGCACHE_RBTREE,
238         .max_register = REG_IRQ_STAT,
239 };
240
241 static struct sn65dsi83 *bridge_to_sn65dsi83(struct drm_bridge *bridge)
242 {
243         return container_of(bridge, struct sn65dsi83, bridge);
244 }
245
246 static int sn65dsi83_attach(struct drm_bridge *bridge,
247                             enum drm_bridge_attach_flags flags)
248 {
249         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
250
251         return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
252                                  &ctx->bridge, flags);
253 }
254
255 static void sn65dsi83_detach(struct drm_bridge *bridge)
256 {
257         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
258
259         if (!ctx->dsi)
260                 return;
261
262         ctx->dsi = NULL;
263 }
264
265 static u8 sn65dsi83_get_lvds_range(struct sn65dsi83 *ctx,
266                                    const struct drm_display_mode *mode)
267 {
268         /*
269          * The encoding of the LVDS_CLK_RANGE is as follows:
270          * 000 - 25 MHz <= LVDS_CLK < 37.5 MHz
271          * 001 - 37.5 MHz <= LVDS_CLK < 62.5 MHz
272          * 010 - 62.5 MHz <= LVDS_CLK < 87.5 MHz
273          * 011 - 87.5 MHz <= LVDS_CLK < 112.5 MHz
274          * 100 - 112.5 MHz <= LVDS_CLK < 137.5 MHz
275          * 101 - 137.5 MHz <= LVDS_CLK <= 154 MHz
276          * which is a range of 12.5MHz..162.5MHz in 50MHz steps, except that
277          * the ends of the ranges are clamped to the supported range. Since
278          * sn65dsi83_mode_valid() already filters the valid modes and limits
279          * the clock to 25..154 MHz, the range calculation can be simplified
280          * as follows:
281          */
282         int mode_clock = mode->clock;
283
284         if (ctx->lvds_dual_link)
285                 mode_clock /= 2;
286
287         return (mode_clock - 12500) / 25000;
288 }
289
290 static u8 sn65dsi83_get_dsi_range(struct sn65dsi83 *ctx,
291                                   const struct drm_display_mode *mode)
292 {
293         /*
294          * The encoding of the CHA_DSI_CLK_RANGE is as follows:
295          * 0x00 through 0x07 - Reserved
296          * 0x08 - 40 <= DSI_CLK < 45 MHz
297          * 0x09 - 45 <= DSI_CLK < 50 MHz
298          * ...
299          * 0x63 - 495 <= DSI_CLK < 500 MHz
300          * 0x64 - 500 MHz
301          * 0x65 through 0xFF - Reserved
302          * which is DSI clock in 5 MHz steps, clamped to 40..500 MHz.
303          * The DSI clock are calculated as:
304          *  DSI_CLK = mode clock * bpp / dsi_data_lanes / 2
305          * the 2 is there because the bus is DDR.
306          */
307         return DIV_ROUND_UP(clamp((unsigned int)mode->clock *
308                             mipi_dsi_pixel_format_to_bpp(ctx->dsi->format) /
309                             ctx->dsi_lanes / 2, 40000U, 500000U), 5000U);
310 }
311
312 static u8 sn65dsi83_get_dsi_div(struct sn65dsi83 *ctx)
313 {
314         /* The divider is (DSI_CLK / LVDS_CLK) - 1, which really is: */
315         unsigned int dsi_div = mipi_dsi_pixel_format_to_bpp(ctx->dsi->format);
316
317         dsi_div /= ctx->dsi_lanes;
318
319         if (!ctx->lvds_dual_link)
320                 dsi_div /= 2;
321
322         return dsi_div - 1;
323 }
324
325 static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
326                                     struct drm_bridge_state *old_bridge_state)
327 {
328         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
329         struct drm_atomic_state *state = old_bridge_state->base.state;
330         const struct drm_bridge_state *bridge_state;
331         const struct drm_crtc_state *crtc_state;
332         const struct drm_display_mode *mode;
333         struct drm_connector *connector;
334         struct drm_crtc *crtc;
335         bool lvds_format_24bpp;
336         bool lvds_format_jeida;
337         unsigned int pval;
338         __le16 le16val;
339         u16 val;
340         int ret;
341
342         ret = regulator_enable(ctx->vcc);
343         if (ret) {
344                 dev_err(ctx->dev, "Failed to enable vcc: %d\n", ret);
345                 return;
346         }
347
348         /* Deassert reset */
349         gpiod_set_value(ctx->enable_gpio, 1);
350         usleep_range(1000, 1100);
351
352         /* Get the LVDS format from the bridge state. */
353         bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
354
355         switch (bridge_state->output_bus_cfg.format) {
356         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
357                 lvds_format_24bpp = false;
358                 lvds_format_jeida = true;
359                 break;
360         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
361                 lvds_format_24bpp = true;
362                 lvds_format_jeida = true;
363                 break;
364         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
365                 lvds_format_24bpp = true;
366                 lvds_format_jeida = false;
367                 break;
368         default:
369                 /*
370                  * Some bridges still don't set the correct
371                  * LVDS bus pixel format, use SPWG24 default
372                  * format until those are fixed.
373                  */
374                 lvds_format_24bpp = true;
375                 lvds_format_jeida = false;
376                 dev_warn(ctx->dev,
377                          "Unsupported LVDS bus format 0x%04x, please check output bridge driver. Falling back to SPWG24.\n",
378                          bridge_state->output_bus_cfg.format);
379                 break;
380         }
381
382         /*
383          * Retrieve the CRTC adjusted mode. This requires a little dance to go
384          * from the bridge to the encoder, to the connector and to the CRTC.
385          */
386         connector = drm_atomic_get_new_connector_for_encoder(state,
387                                                              bridge->encoder);
388         crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
389         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
390         mode = &crtc_state->adjusted_mode;
391
392         /* Clear reset, disable PLL */
393         regmap_write(ctx->regmap, REG_RC_RESET, 0x00);
394         regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
395
396         /* Reference clock derived from DSI link clock. */
397         regmap_write(ctx->regmap, REG_RC_LVDS_PLL,
398                      REG_RC_LVDS_PLL_LVDS_CLK_RANGE(sn65dsi83_get_lvds_range(ctx, mode)) |
399                      REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY);
400         regmap_write(ctx->regmap, REG_DSI_CLK,
401                      REG_DSI_CLK_CHA_DSI_CLK_RANGE(sn65dsi83_get_dsi_range(ctx, mode)));
402         regmap_write(ctx->regmap, REG_RC_DSI_CLK,
403                      REG_RC_DSI_CLK_DSI_CLK_DIVIDER(sn65dsi83_get_dsi_div(ctx)));
404
405         /* Set number of DSI lanes and LVDS link config. */
406         regmap_write(ctx->regmap, REG_DSI_LANE,
407                      REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE |
408                      REG_DSI_LANE_CHA_DSI_LANES(~(ctx->dsi_lanes - 1)) |
409                      /* CHB is DSI85-only, set to default on DSI83/DSI84 */
410                      REG_DSI_LANE_CHB_DSI_LANES(3));
411         /* No equalization. */
412         regmap_write(ctx->regmap, REG_DSI_EQ, 0x00);
413
414         /* Set up sync signal polarity. */
415         val = (mode->flags & DRM_MODE_FLAG_NHSYNC ?
416                REG_LVDS_FMT_HS_NEG_POLARITY : 0) |
417               (mode->flags & DRM_MODE_FLAG_NVSYNC ?
418                REG_LVDS_FMT_VS_NEG_POLARITY : 0);
419
420         /* Set up bits-per-pixel, 18bpp or 24bpp. */
421         if (lvds_format_24bpp) {
422                 val |= REG_LVDS_FMT_CHA_24BPP_MODE;
423                 if (ctx->lvds_dual_link)
424                         val |= REG_LVDS_FMT_CHB_24BPP_MODE;
425         }
426
427         /* Set up LVDS format, JEIDA/Format 1 or SPWG/Format 2 */
428         if (lvds_format_jeida) {
429                 val |= REG_LVDS_FMT_CHA_24BPP_FORMAT1;
430                 if (ctx->lvds_dual_link)
431                         val |= REG_LVDS_FMT_CHB_24BPP_FORMAT1;
432         }
433
434         /* Set up LVDS output config (DSI84,DSI85) */
435         if (!ctx->lvds_dual_link)
436                 val |= REG_LVDS_FMT_LVDS_LINK_CFG;
437
438         regmap_write(ctx->regmap, REG_LVDS_FMT, val);
439         regmap_write(ctx->regmap, REG_LVDS_VCOM, 0x05);
440         regmap_write(ctx->regmap, REG_LVDS_LANE,
441                      (ctx->lvds_dual_link_even_odd_swap ?
442                       REG_LVDS_LANE_EVEN_ODD_SWAP : 0) |
443                      REG_LVDS_LANE_CHA_LVDS_TERM |
444                      REG_LVDS_LANE_CHB_LVDS_TERM);
445         regmap_write(ctx->regmap, REG_LVDS_CM, 0x00);
446
447         le16val = cpu_to_le16(mode->hdisplay);
448         regmap_bulk_write(ctx->regmap, REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
449                           &le16val, 2);
450         le16val = cpu_to_le16(mode->vdisplay);
451         regmap_bulk_write(ctx->regmap, REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
452                           &le16val, 2);
453         /* 32 + 1 pixel clock to ensure proper operation */
454         le16val = cpu_to_le16(32 + 1);
455         regmap_bulk_write(ctx->regmap, REG_VID_CHA_SYNC_DELAY_LOW, &le16val, 2);
456         le16val = cpu_to_le16(mode->hsync_end - mode->hsync_start);
457         regmap_bulk_write(ctx->regmap, REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
458                           &le16val, 2);
459         le16val = cpu_to_le16(mode->vsync_end - mode->vsync_start);
460         regmap_bulk_write(ctx->regmap, REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
461                           &le16val, 2);
462         regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_BACK_PORCH,
463                      mode->htotal - mode->hsync_end);
464         regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_BACK_PORCH,
465                      mode->vtotal - mode->vsync_end);
466         regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
467                      mode->hsync_start - mode->hdisplay);
468         regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_FRONT_PORCH,
469                      mode->vsync_start - mode->vdisplay);
470         regmap_write(ctx->regmap, REG_VID_CHA_TEST_PATTERN, 0x00);
471
472         /* Enable PLL */
473         regmap_write(ctx->regmap, REG_RC_PLL_EN, REG_RC_PLL_EN_PLL_EN);
474         usleep_range(3000, 4000);
475         ret = regmap_read_poll_timeout(ctx->regmap, REG_RC_LVDS_PLL, pval,
476                                        pval & REG_RC_LVDS_PLL_PLL_EN_STAT,
477                                        1000, 100000);
478         if (ret) {
479                 dev_err(ctx->dev, "failed to lock PLL, ret=%i\n", ret);
480                 /* On failure, disable PLL again and exit. */
481                 regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
482                 return;
483         }
484
485         /* Trigger reset after CSR register update. */
486         regmap_write(ctx->regmap, REG_RC_RESET, REG_RC_RESET_SOFT_RESET);
487
488         /* Clear all errors that got asserted during initialization. */
489         regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
490         regmap_write(ctx->regmap, REG_IRQ_STAT, pval);
491
492         usleep_range(10000, 12000);
493         regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
494         if (pval)
495                 dev_err(ctx->dev, "Unexpected link status 0x%02x\n", pval);
496 }
497
498 static void sn65dsi83_atomic_disable(struct drm_bridge *bridge,
499                                      struct drm_bridge_state *old_bridge_state)
500 {
501         struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
502         int ret;
503
504         /* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
505         gpiod_set_value(ctx->enable_gpio, 0);
506         usleep_range(10000, 11000);
507
508         ret = regulator_disable(ctx->vcc);
509         if (ret)
510                 dev_err(ctx->dev, "Failed to disable vcc: %d\n", ret);
511
512         regcache_mark_dirty(ctx->regmap);
513 }
514
515 static enum drm_mode_status
516 sn65dsi83_mode_valid(struct drm_bridge *bridge,
517                      const struct drm_display_info *info,
518                      const struct drm_display_mode *mode)
519 {
520         /* LVDS output clock range 25..154 MHz */
521         if (mode->clock < 25000)
522                 return MODE_CLOCK_LOW;
523         if (mode->clock > 154000)
524                 return MODE_CLOCK_HIGH;
525
526         return MODE_OK;
527 }
528
529 #define MAX_INPUT_SEL_FORMATS   1
530
531 static u32 *
532 sn65dsi83_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
533                                     struct drm_bridge_state *bridge_state,
534                                     struct drm_crtc_state *crtc_state,
535                                     struct drm_connector_state *conn_state,
536                                     u32 output_fmt,
537                                     unsigned int *num_input_fmts)
538 {
539         u32 *input_fmts;
540
541         *num_input_fmts = 0;
542
543         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
544                              GFP_KERNEL);
545         if (!input_fmts)
546                 return NULL;
547
548         /* This is the DSI-end bus format */
549         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
550         *num_input_fmts = 1;
551
552         return input_fmts;
553 }
554
555 static const struct drm_bridge_funcs sn65dsi83_funcs = {
556         .attach                 = sn65dsi83_attach,
557         .detach                 = sn65dsi83_detach,
558         .atomic_enable          = sn65dsi83_atomic_enable,
559         .atomic_disable         = sn65dsi83_atomic_disable,
560         .mode_valid             = sn65dsi83_mode_valid,
561
562         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
563         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
564         .atomic_reset = drm_atomic_helper_bridge_reset,
565         .atomic_get_input_bus_fmts = sn65dsi83_atomic_get_input_bus_fmts,
566 };
567
568 static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
569 {
570         struct drm_bridge *panel_bridge;
571         struct device *dev = ctx->dev;
572         struct device_node *endpoint;
573         int ret;
574
575         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
576         ctx->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
577         ctx->host_node = of_graph_get_remote_port_parent(endpoint);
578         of_node_put(endpoint);
579
580         if (ctx->dsi_lanes < 0 || ctx->dsi_lanes > 4) {
581                 ret = -EINVAL;
582                 goto err_put_node;
583         }
584         if (!ctx->host_node) {
585                 ret = -ENODEV;
586                 goto err_put_node;
587         }
588
589         ctx->lvds_dual_link = false;
590         ctx->lvds_dual_link_even_odd_swap = false;
591         if (model != MODEL_SN65DSI83) {
592                 struct device_node *port2, *port3;
593                 int dual_link;
594
595                 port2 = of_graph_get_port_by_id(dev->of_node, 2);
596                 port3 = of_graph_get_port_by_id(dev->of_node, 3);
597                 dual_link = drm_of_lvds_get_dual_link_pixel_order(port2, port3);
598                 of_node_put(port2);
599                 of_node_put(port3);
600
601                 if (dual_link == DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS) {
602                         ctx->lvds_dual_link = true;
603                         /* Odd pixels to LVDS Channel A, even pixels to B */
604                         ctx->lvds_dual_link_even_odd_swap = false;
605                 } else if (dual_link == DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS) {
606                         ctx->lvds_dual_link = true;
607                         /* Even pixels to LVDS Channel A, odd pixels to B */
608                         ctx->lvds_dual_link_even_odd_swap = true;
609                 }
610         }
611
612         panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 2, 0);
613         if (IS_ERR(panel_bridge)) {
614                 ret = PTR_ERR(panel_bridge);
615                 goto err_put_node;
616         }
617
618         ctx->panel_bridge = panel_bridge;
619
620         ctx->vcc = devm_regulator_get(dev, "vcc");
621         if (IS_ERR(ctx->vcc))
622                 return dev_err_probe(dev, PTR_ERR(ctx->vcc),
623                                      "Failed to get supply 'vcc'\n");
624
625         return 0;
626
627 err_put_node:
628         of_node_put(ctx->host_node);
629         return ret;
630 }
631
632 static int sn65dsi83_host_attach(struct sn65dsi83 *ctx)
633 {
634         struct device *dev = ctx->dev;
635         struct mipi_dsi_device *dsi;
636         struct mipi_dsi_host *host;
637         const struct mipi_dsi_device_info info = {
638                 .type = "sn65dsi83",
639                 .channel = 0,
640                 .node = NULL,
641         };
642         int ret;
643
644         host = of_find_mipi_dsi_host_by_node(ctx->host_node);
645         if (!host) {
646                 dev_err(dev, "failed to find dsi host\n");
647                 return -EPROBE_DEFER;
648         }
649
650         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
651         if (IS_ERR(dsi))
652                 return dev_err_probe(dev, PTR_ERR(dsi),
653                                      "failed to create dsi device\n");
654
655         ctx->dsi = dsi;
656
657         dsi->lanes = ctx->dsi_lanes;
658         dsi->format = MIPI_DSI_FMT_RGB888;
659         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
660
661         ret = devm_mipi_dsi_attach(dev, dsi);
662         if (ret < 0) {
663                 dev_err(dev, "failed to attach dsi to host: %d\n", ret);
664                 return ret;
665         }
666
667         return 0;
668 }
669
670 static int sn65dsi83_probe(struct i2c_client *client,
671                            const struct i2c_device_id *id)
672 {
673         struct device *dev = &client->dev;
674         enum sn65dsi83_model model;
675         struct sn65dsi83 *ctx;
676         int ret;
677
678         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
679         if (!ctx)
680                 return -ENOMEM;
681
682         ctx->dev = dev;
683
684         if (dev->of_node) {
685                 model = (enum sn65dsi83_model)(uintptr_t)
686                         of_device_get_match_data(dev);
687         } else {
688                 model = id->driver_data;
689         }
690
691         /* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
692         ctx->enable_gpio = devm_gpiod_get_optional(ctx->dev, "enable",
693                                                    GPIOD_OUT_LOW);
694         if (IS_ERR(ctx->enable_gpio))
695                 return PTR_ERR(ctx->enable_gpio);
696
697         usleep_range(10000, 11000);
698
699         ret = sn65dsi83_parse_dt(ctx, model);
700         if (ret)
701                 return ret;
702
703         ctx->regmap = devm_regmap_init_i2c(client, &sn65dsi83_regmap_config);
704         if (IS_ERR(ctx->regmap)) {
705                 ret = PTR_ERR(ctx->regmap);
706                 goto err_put_node;
707         }
708
709         dev_set_drvdata(dev, ctx);
710         i2c_set_clientdata(client, ctx);
711
712         ctx->bridge.funcs = &sn65dsi83_funcs;
713         ctx->bridge.of_node = dev->of_node;
714         drm_bridge_add(&ctx->bridge);
715
716         ret = sn65dsi83_host_attach(ctx);
717         if (ret)
718                 goto err_remove_bridge;
719
720         return 0;
721
722 err_remove_bridge:
723         drm_bridge_remove(&ctx->bridge);
724 err_put_node:
725         of_node_put(ctx->host_node);
726         return ret;
727 }
728
729 static int sn65dsi83_remove(struct i2c_client *client)
730 {
731         struct sn65dsi83 *ctx = i2c_get_clientdata(client);
732
733         drm_bridge_remove(&ctx->bridge);
734         of_node_put(ctx->host_node);
735
736         return 0;
737 }
738
739 static struct i2c_device_id sn65dsi83_id[] = {
740         { "ti,sn65dsi83", MODEL_SN65DSI83 },
741         { "ti,sn65dsi84", MODEL_SN65DSI84 },
742         {},
743 };
744 MODULE_DEVICE_TABLE(i2c, sn65dsi83_id);
745
746 static const struct of_device_id sn65dsi83_match_table[] = {
747         { .compatible = "ti,sn65dsi83", .data = (void *)MODEL_SN65DSI83 },
748         { .compatible = "ti,sn65dsi84", .data = (void *)MODEL_SN65DSI84 },
749         {},
750 };
751 MODULE_DEVICE_TABLE(of, sn65dsi83_match_table);
752
753 static struct i2c_driver sn65dsi83_driver = {
754         .probe = sn65dsi83_probe,
755         .remove = sn65dsi83_remove,
756         .id_table = sn65dsi83_id,
757         .driver = {
758                 .name = "sn65dsi83",
759                 .of_match_table = sn65dsi83_match_table,
760         },
761 };
762 module_i2c_driver(sn65dsi83_driver);
763
764 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
765 MODULE_DESCRIPTION("TI SN65DSI83 DSI to LVDS bridge driver");
766 MODULE_LICENSE("GPL v2");