1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2016 Allwinnertech Co., Ltd.
4 * Copyright (C) 2017-2018 Bootlin
5 *
6 * Maxime Ripard <maxime.ripard@bootlin.com>
7 */
8
9 #include <linux/clk.h>
10 #include <linux/component.h>
11 #include <linux/crc-ccitt.h>
12 #include <linux/module.h>
13 #include <linux/of_address.h>
14 #include <linux/phy/phy-mipi-dphy.h>
15 #include <linux/phy/phy.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/reset.h>
20 #include <linux/slab.h>
21
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_mipi_dsi.h>
24 #include <drm/drm_panel.h>
25 #include <drm/drm_print.h>
26 #include <drm/drm_probe_helper.h>
27 #include <drm/drm_simple_kms_helper.h>
28
29 #include "sun4i_crtc.h"
30 #include "sun4i_tcon.h"
31 #include "sun6i_mipi_dsi.h"
32
33 #include <video/mipi_display.h>
34
35 #define SUN6I_DSI_CTL_REG 0x000
36 #define SUN6I_DSI_CTL_EN BIT(0)
37
38 #define SUN6I_DSI_BASIC_CTL_REG 0x00c
39 #define SUN6I_DSI_BASIC_CTL_TRAIL_INV(n) (((n) & 0xf) << 4)
40 #define SUN6I_DSI_BASIC_CTL_TRAIL_FILL BIT(3)
41 #define SUN6I_DSI_BASIC_CTL_HBP_DIS BIT(2)
42 #define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS BIT(1)
43 #define SUN6I_DSI_BASIC_CTL_VIDEO_BURST BIT(0)
44
45 #define SUN6I_DSI_BASIC_CTL0_REG 0x010
46 #define SUN6I_DSI_BASIC_CTL0_HS_EOTP_EN BIT(18)
47 #define SUN6I_DSI_BASIC_CTL0_CRC_EN BIT(17)
48 #define SUN6I_DSI_BASIC_CTL0_ECC_EN BIT(16)
49 #define SUN6I_DSI_BASIC_CTL0_INST_ST BIT(0)
50
51 #define SUN6I_DSI_BASIC_CTL1_REG 0x014
52 #define SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(n) (((n) & 0x1fff) << 4)
53 #define SUN6I_DSI_BASIC_CTL1_VIDEO_FILL BIT(2)
54 #define SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION BIT(1)
55 #define SUN6I_DSI_BASIC_CTL1_VIDEO_MODE BIT(0)
56
57 #define SUN6I_DSI_BASIC_SIZE0_REG 0x018
58 #define SUN6I_DSI_BASIC_SIZE0_VBP(n) (((n) & 0xfff) << 16)
59 #define SUN6I_DSI_BASIC_SIZE0_VSA(n) ((n) & 0xfff)
60
61 #define SUN6I_DSI_BASIC_SIZE1_REG 0x01c
62 #define SUN6I_DSI_BASIC_SIZE1_VT(n) (((n) & 0xfff) << 16)
63 #define SUN6I_DSI_BASIC_SIZE1_VACT(n) ((n) & 0xfff)
64
65 #define SUN6I_DSI_INST_FUNC_REG(n) (0x020 + (n) * 0x04)
66 #define SUN6I_DSI_INST_FUNC_INST_MODE(n) (((n) & 0xf) << 28)
67 #define SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(n) (((n) & 0xf) << 24)
68 #define SUN6I_DSI_INST_FUNC_TRANS_PACKET(n) (((n) & 0xf) << 20)
69 #define SUN6I_DSI_INST_FUNC_LANE_CEN BIT(4)
70 #define SUN6I_DSI_INST_FUNC_LANE_DEN(n) ((n) & 0xf)
71
72 #define SUN6I_DSI_INST_LOOP_SEL_REG 0x040
73
74 #define SUN6I_DSI_INST_LOOP_NUM_REG(n) (0x044 + (n) * 0x10)
75 #define SUN6I_DSI_INST_LOOP_NUM_N1(n) (((n) & 0xfff) << 16)
76 #define SUN6I_DSI_INST_LOOP_NUM_N0(n) ((n) & 0xfff)
77
78 #define SUN6I_DSI_INST_JUMP_SEL_REG 0x048
79
80 #define SUN6I_DSI_INST_JUMP_CFG_REG(n) (0x04c + (n) * 0x04)
81 #define SUN6I_DSI_INST_JUMP_CFG_TO(n) (((n) & 0xf) << 20)
82 #define SUN6I_DSI_INST_JUMP_CFG_POINT(n) (((n) & 0xf) << 16)
83 #define SUN6I_DSI_INST_JUMP_CFG_NUM(n) ((n) & 0xffff)
84
85 #define SUN6I_DSI_TRANS_START_REG 0x060
86
87 #define SUN6I_DSI_TRANS_ZERO_REG 0x078
88
89 #define SUN6I_DSI_TCON_DRQ_REG 0x07c
90 #define SUN6I_DSI_TCON_DRQ_ENABLE_MODE BIT(28)
91 #define SUN6I_DSI_TCON_DRQ_SET(n) ((n) & 0x3ff)
92
93 #define SUN6I_DSI_PIXEL_CTL0_REG 0x080
94 #define SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE BIT(16)
95 #define SUN6I_DSI_PIXEL_CTL0_FORMAT(n) ((n) & 0xf)
96
97 #define SUN6I_DSI_PIXEL_CTL1_REG 0x084
98
99 #define SUN6I_DSI_PIXEL_PH_REG 0x090
100 #define SUN6I_DSI_PIXEL_PH_ECC(n) (((n) & 0xff) << 24)
101 #define SUN6I_DSI_PIXEL_PH_WC(n) (((n) & 0xffff) << 8)
102 #define SUN6I_DSI_PIXEL_PH_VC(n) (((n) & 3) << 6)
103 #define SUN6I_DSI_PIXEL_PH_DT(n) ((n) & 0x3f)
104
105 #define SUN6I_DSI_PIXEL_PF0_REG 0x098
106 #define SUN6I_DSI_PIXEL_PF0_CRC_FORCE(n) ((n) & 0xffff)
107
108 #define SUN6I_DSI_PIXEL_PF1_REG 0x09c
109 #define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(n) (((n) & 0xffff) << 16)
110 #define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(n) ((n) & 0xffff)
111
112 #define SUN6I_DSI_SYNC_HSS_REG 0x0b0
113
114 #define SUN6I_DSI_SYNC_HSE_REG 0x0b4
115
116 #define SUN6I_DSI_SYNC_VSS_REG 0x0b8
117
118 #define SUN6I_DSI_SYNC_VSE_REG 0x0bc
119
120 #define SUN6I_DSI_BLK_HSA0_REG 0x0c0
121
122 #define SUN6I_DSI_BLK_HSA1_REG 0x0c4
123 #define SUN6I_DSI_BLK_PF(n) (((n) & 0xffff) << 16)
124 #define SUN6I_DSI_BLK_PD(n) ((n) & 0xff)
125
126 #define SUN6I_DSI_BLK_HBP0_REG 0x0c8
127
128 #define SUN6I_DSI_BLK_HBP1_REG 0x0cc
129
130 #define SUN6I_DSI_BLK_HFP0_REG 0x0d0
131
132 #define SUN6I_DSI_BLK_HFP1_REG 0x0d4
133
134 #define SUN6I_DSI_BLK_HBLK0_REG 0x0e0
135
136 #define SUN6I_DSI_BLK_HBLK1_REG 0x0e4
137
138 #define SUN6I_DSI_BLK_VBLK0_REG 0x0e8
139
140 #define SUN6I_DSI_BLK_VBLK1_REG 0x0ec
141
142 #define SUN6I_DSI_BURST_LINE_REG 0x0f0
143 #define SUN6I_DSI_BURST_LINE_SYNC_POINT(n) (((n) & 0xffff) << 16)
144 #define SUN6I_DSI_BURST_LINE_NUM(n) ((n) & 0xffff)
145
146 #define SUN6I_DSI_BURST_DRQ_REG 0x0f4
147 #define SUN6I_DSI_BURST_DRQ_EDGE1(n) (((n) & 0xffff) << 16)
148 #define SUN6I_DSI_BURST_DRQ_EDGE0(n) ((n) & 0xffff)
149
150 #define SUN6I_DSI_CMD_CTL_REG 0x200
151 #define SUN6I_DSI_CMD_CTL_RX_OVERFLOW BIT(26)
152 #define SUN6I_DSI_CMD_CTL_RX_FLAG BIT(25)
153 #define SUN6I_DSI_CMD_CTL_TX_FLAG BIT(9)
154
155 #define SUN6I_DSI_CMD_RX_REG(n) (0x240 + (n) * 0x04)
156
157 #define SUN6I_DSI_DEBUG_DATA_REG 0x2f8
158
159 #define SUN6I_DSI_CMD_TX_REG(n) (0x300 + (n) * 0x04)
160
161 #define SUN6I_DSI_SYNC_POINT 40
162
163 enum sun6i_dsi_start_inst {
164 DSI_START_LPRX,
165 DSI_START_LPTX,
166 DSI_START_HSC,
167 DSI_START_HSD,
168 };
169
170 enum sun6i_dsi_inst_id {
171 DSI_INST_ID_LP11 = 0,
172 DSI_INST_ID_TBA,
173 DSI_INST_ID_HSC,
174 DSI_INST_ID_HSD,
175 DSI_INST_ID_LPDT,
176 DSI_INST_ID_HSCEXIT,
177 DSI_INST_ID_NOP,
178 DSI_INST_ID_DLY,
179 DSI_INST_ID_END = 15,
180 };
181
182 enum sun6i_dsi_inst_mode {
183 DSI_INST_MODE_STOP = 0,
184 DSI_INST_MODE_TBA,
185 DSI_INST_MODE_HS,
186 DSI_INST_MODE_ESCAPE,
187 DSI_INST_MODE_HSCEXIT,
188 DSI_INST_MODE_NOP,
189 };
190
191 enum sun6i_dsi_inst_escape {
192 DSI_INST_ESCA_LPDT = 0,
193 DSI_INST_ESCA_ULPS,
194 DSI_INST_ESCA_UN1,
195 DSI_INST_ESCA_UN2,
196 DSI_INST_ESCA_RESET,
197 DSI_INST_ESCA_UN3,
198 DSI_INST_ESCA_UN4,
199 DSI_INST_ESCA_UN5,
200 };
201
202 enum sun6i_dsi_inst_packet {
203 DSI_INST_PACK_PIXEL = 0,
204 DSI_INST_PACK_COMMAND,
205 };
206
207 static const u32 sun6i_dsi_ecc_array[] = {
208 [0] = (BIT(0) | BIT(1) | BIT(2) | BIT(4) | BIT(5) | BIT(7) | BIT(10) |
209 BIT(11) | BIT(13) | BIT(16) | BIT(20) | BIT(21) | BIT(22) |
210 BIT(23)),
211 [1] = (BIT(0) | BIT(1) | BIT(3) | BIT(4) | BIT(6) | BIT(8) | BIT(10) |
212 BIT(12) | BIT(14) | BIT(17) | BIT(20) | BIT(21) | BIT(22) |
213 BIT(23)),
214 [2] = (BIT(0) | BIT(2) | BIT(3) | BIT(5) | BIT(6) | BIT(9) | BIT(11) |
215 BIT(12) | BIT(15) | BIT(18) | BIT(20) | BIT(21) | BIT(22)),
216 [3] = (BIT(1) | BIT(2) | BIT(3) | BIT(7) | BIT(8) | BIT(9) | BIT(13) |
217 BIT(14) | BIT(15) | BIT(19) | BIT(20) | BIT(21) | BIT(23)),
218 [4] = (BIT(4) | BIT(5) | BIT(6) | BIT(7) | BIT(8) | BIT(9) | BIT(16) |
219 BIT(17) | BIT(18) | BIT(19) | BIT(20) | BIT(22) | BIT(23)),
220 [5] = (BIT(10) | BIT(11) | BIT(12) | BIT(13) | BIT(14) | BIT(15) |
221 BIT(16) | BIT(17) | BIT(18) | BIT(19) | BIT(21) | BIT(22) |
222 BIT(23)),
223 };
224
sun6i_dsi_ecc_compute(unsigned int data)225 static u32 sun6i_dsi_ecc_compute(unsigned int data)
226 {
227 int i;
228 u8 ecc = 0;
229
230 for (i = 0; i < ARRAY_SIZE(sun6i_dsi_ecc_array); i++) {
231 u32 field = sun6i_dsi_ecc_array[i];
232 bool init = false;
233 u8 val = 0;
234 int j;
235
236 for (j = 0; j < 24; j++) {
237 if (!(BIT(j) & field))
238 continue;
239
240 if (!init) {
241 val = (BIT(j) & data) ? 1 : 0;
242 init = true;
243 } else {
244 val ^= (BIT(j) & data) ? 1 : 0;
245 }
246 }
247
248 ecc |= val << i;
249 }
250
251 return ecc;
252 }
253
sun6i_dsi_crc_compute(u8 const * buffer,size_t len)254 static u16 sun6i_dsi_crc_compute(u8 const *buffer, size_t len)
255 {
256 return crc_ccitt(0xffff, buffer, len);
257 }
258
sun6i_dsi_crc_repeat(u8 pd,u8 * buffer,size_t len)259 static u16 sun6i_dsi_crc_repeat(u8 pd, u8 *buffer, size_t len)
260 {
261 memset(buffer, pd, len);
262
263 return sun6i_dsi_crc_compute(buffer, len);
264 }
265
sun6i_dsi_build_sync_pkt(u8 dt,u8 vc,u8 d0,u8 d1)266 static u32 sun6i_dsi_build_sync_pkt(u8 dt, u8 vc, u8 d0, u8 d1)
267 {
268 u32 val = dt & 0x3f;
269
270 val |= (vc & 3) << 6;
271 val |= (d0 & 0xff) << 8;
272 val |= (d1 & 0xff) << 16;
273 val |= sun6i_dsi_ecc_compute(val) << 24;
274
275 return val;
276 }
277
sun6i_dsi_build_blk0_pkt(u8 vc,u16 wc)278 static u32 sun6i_dsi_build_blk0_pkt(u8 vc, u16 wc)
279 {
280 return sun6i_dsi_build_sync_pkt(MIPI_DSI_BLANKING_PACKET, vc,
281 wc & 0xff, wc >> 8);
282 }
283
sun6i_dsi_build_blk1_pkt(u16 pd,u8 * buffer,size_t len)284 static u32 sun6i_dsi_build_blk1_pkt(u16 pd, u8 *buffer, size_t len)
285 {
286 u32 val = SUN6I_DSI_BLK_PD(pd);
287
288 return val | SUN6I_DSI_BLK_PF(sun6i_dsi_crc_repeat(pd, buffer, len));
289 }
290
sun6i_dsi_inst_abort(struct sun6i_dsi * dsi)291 static void sun6i_dsi_inst_abort(struct sun6i_dsi *dsi)
292 {
293 regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
294 SUN6I_DSI_BASIC_CTL0_INST_ST, 0);
295 }
296
sun6i_dsi_inst_commit(struct sun6i_dsi * dsi)297 static void sun6i_dsi_inst_commit(struct sun6i_dsi *dsi)
298 {
299 regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
300 SUN6I_DSI_BASIC_CTL0_INST_ST,
301 SUN6I_DSI_BASIC_CTL0_INST_ST);
302 }
303
sun6i_dsi_inst_wait_for_completion(struct sun6i_dsi * dsi)304 static int sun6i_dsi_inst_wait_for_completion(struct sun6i_dsi *dsi)
305 {
306 u32 val;
307
308 return regmap_read_poll_timeout(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
309 val,
310 !(val & SUN6I_DSI_BASIC_CTL0_INST_ST),
311 100, 5000);
312 }
313
sun6i_dsi_inst_setup(struct sun6i_dsi * dsi,enum sun6i_dsi_inst_id id,enum sun6i_dsi_inst_mode mode,bool clock,u8 data,enum sun6i_dsi_inst_packet packet,enum sun6i_dsi_inst_escape escape)314 static void sun6i_dsi_inst_setup(struct sun6i_dsi *dsi,
315 enum sun6i_dsi_inst_id id,
316 enum sun6i_dsi_inst_mode mode,
317 bool clock, u8 data,
318 enum sun6i_dsi_inst_packet packet,
319 enum sun6i_dsi_inst_escape escape)
320 {
321 regmap_write(dsi->regs, SUN6I_DSI_INST_FUNC_REG(id),
322 SUN6I_DSI_INST_FUNC_INST_MODE(mode) |
323 SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(escape) |
324 SUN6I_DSI_INST_FUNC_TRANS_PACKET(packet) |
325 (clock ? SUN6I_DSI_INST_FUNC_LANE_CEN : 0) |
326 SUN6I_DSI_INST_FUNC_LANE_DEN(data));
327 }
328
sun6i_dsi_inst_init(struct sun6i_dsi * dsi,struct mipi_dsi_device * device)329 static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
330 struct mipi_dsi_device *device)
331 {
332 u8 lanes_mask = GENMASK(device->lanes - 1, 0);
333
334 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LP11, DSI_INST_MODE_STOP,
335 true, lanes_mask, 0, 0);
336
337 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_TBA, DSI_INST_MODE_TBA,
338 false, 1, 0, 0);
339
340 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSC, DSI_INST_MODE_HS,
341 true, 0, DSI_INST_PACK_PIXEL, 0);
342
343 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSD, DSI_INST_MODE_HS,
344 false, lanes_mask, DSI_INST_PACK_PIXEL, 0);
345
346 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LPDT, DSI_INST_MODE_ESCAPE,
347 false, 1, DSI_INST_PACK_COMMAND,
348 DSI_INST_ESCA_LPDT);
349
350 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSCEXIT, DSI_INST_MODE_HSCEXIT,
351 true, 0, 0, 0);
352
353 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_NOP, DSI_INST_MODE_STOP,
354 false, lanes_mask, 0, 0);
355
356 sun6i_dsi_inst_setup(dsi, DSI_INST_ID_DLY, DSI_INST_MODE_NOP,
357 true, lanes_mask, 0, 0);
358
359 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_CFG_REG(0),
360 SUN6I_DSI_INST_JUMP_CFG_POINT(DSI_INST_ID_NOP) |
361 SUN6I_DSI_INST_JUMP_CFG_TO(DSI_INST_ID_HSCEXIT) |
362 SUN6I_DSI_INST_JUMP_CFG_NUM(1));
363 };
364
sun6i_dsi_get_video_start_delay(struct sun6i_dsi * dsi,struct drm_display_mode * mode)365 static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
366 struct drm_display_mode *mode)
367 {
368 u16 delay = mode->vtotal - (mode->vsync_start - mode->vdisplay) + 1;
369
370 if (delay > mode->vtotal)
371 delay = delay % mode->vtotal;
372
373 return max_t(u16, delay, 1);
374 }
375
sun6i_dsi_get_line_num(struct sun6i_dsi * dsi,struct drm_display_mode * mode)376 static u16 sun6i_dsi_get_line_num(struct sun6i_dsi *dsi,
377 struct drm_display_mode *mode)
378 {
379 struct mipi_dsi_device *device = dsi->device;
380 unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
381
382 return mode->htotal * Bpp / device->lanes;
383 }
384
sun6i_dsi_get_drq_edge0(struct sun6i_dsi * dsi,struct drm_display_mode * mode,u16 line_num,u16 edge1)385 static u16 sun6i_dsi_get_drq_edge0(struct sun6i_dsi *dsi,
386 struct drm_display_mode *mode,
387 u16 line_num, u16 edge1)
388 {
389 u16 edge0 = edge1;
390
391 edge0 += (mode->hdisplay + 40) * SUN6I_DSI_TCON_DIV / 8;
392
393 if (edge0 > line_num)
394 return edge0 - line_num;
395
396 return 1;
397 }
398
sun6i_dsi_get_drq_edge1(struct sun6i_dsi * dsi,struct drm_display_mode * mode,u16 line_num)399 static u16 sun6i_dsi_get_drq_edge1(struct sun6i_dsi *dsi,
400 struct drm_display_mode *mode,
401 u16 line_num)
402 {
403 struct mipi_dsi_device *device = dsi->device;
404 unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
405 unsigned int hbp = mode->htotal - mode->hsync_end;
406 u16 edge1;
407
408 edge1 = SUN6I_DSI_SYNC_POINT;
409 edge1 += (mode->hdisplay + hbp + 20) * Bpp / device->lanes;
410
411 if (edge1 > line_num)
412 return line_num;
413
414 return edge1;
415 }
416
sun6i_dsi_setup_burst(struct sun6i_dsi * dsi,struct drm_display_mode * mode)417 static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
418 struct drm_display_mode *mode)
419 {
420 struct mipi_dsi_device *device = dsi->device;
421 u32 val = 0;
422
423 if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
424 u16 line_num = sun6i_dsi_get_line_num(dsi, mode);
425 u16 edge0, edge1;
426
427 edge1 = sun6i_dsi_get_drq_edge1(dsi, mode, line_num);
428 edge0 = sun6i_dsi_get_drq_edge0(dsi, mode, line_num, edge1);
429
430 regmap_write(dsi->regs, SUN6I_DSI_BURST_DRQ_REG,
431 SUN6I_DSI_BURST_DRQ_EDGE0(edge0) |
432 SUN6I_DSI_BURST_DRQ_EDGE1(edge1));
433
434 regmap_write(dsi->regs, SUN6I_DSI_BURST_LINE_REG,
435 SUN6I_DSI_BURST_LINE_NUM(line_num) |
436 SUN6I_DSI_BURST_LINE_SYNC_POINT(SUN6I_DSI_SYNC_POINT));
437
438 val = SUN6I_DSI_TCON_DRQ_ENABLE_MODE;
439 } else if ((mode->hsync_start - mode->hdisplay) > 20) {
440 /* Maaaaaagic */
441 u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
442
443 drq *= mipi_dsi_pixel_format_to_bpp(device->format);
444 drq /= 32;
445
446 val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
447 SUN6I_DSI_TCON_DRQ_SET(drq));
448 }
449
450 regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
451 }
452
sun6i_dsi_setup_inst_loop(struct sun6i_dsi * dsi,struct drm_display_mode * mode)453 static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
454 struct drm_display_mode *mode)
455 {
456 struct mipi_dsi_device *device = dsi->device;
457 u16 delay = 50 - 1;
458
459 if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
460 u32 hsync_porch = (mode->htotal - mode->hdisplay) * 150;
461
462 delay = (hsync_porch / ((mode->clock / 1000) * 8));
463 delay -= 50;
464 }
465
466 regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_SEL_REG,
467 2 << (4 * DSI_INST_ID_LP11) |
468 3 << (4 * DSI_INST_ID_DLY));
469
470 regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
471 SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
472 SUN6I_DSI_INST_LOOP_NUM_N1(delay));
473 regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(1),
474 SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
475 SUN6I_DSI_INST_LOOP_NUM_N1(delay));
476 }
477
sun6i_dsi_setup_format(struct sun6i_dsi * dsi,struct drm_display_mode * mode)478 static void sun6i_dsi_setup_format(struct sun6i_dsi *dsi,
479 struct drm_display_mode *mode)
480 {
481 struct mipi_dsi_device *device = dsi->device;
482 u32 val = SUN6I_DSI_PIXEL_PH_VC(device->channel);
483 u8 dt, fmt;
484 u16 wc;
485
486 /*
487 * TODO: The format defines are only valid in video mode and
488 * change in command mode.
489 */
490 switch (device->format) {
491 case MIPI_DSI_FMT_RGB888:
492 dt = MIPI_DSI_PACKED_PIXEL_STREAM_24;
493 fmt = 8;
494 break;
495 case MIPI_DSI_FMT_RGB666:
496 dt = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
497 fmt = 9;
498 break;
499 case MIPI_DSI_FMT_RGB666_PACKED:
500 dt = MIPI_DSI_PACKED_PIXEL_STREAM_18;
501 fmt = 10;
502 break;
503 case MIPI_DSI_FMT_RGB565:
504 dt = MIPI_DSI_PACKED_PIXEL_STREAM_16;
505 fmt = 11;
506 break;
507 default:
508 return;
509 }
510 val |= SUN6I_DSI_PIXEL_PH_DT(dt);
511
512 wc = mode->hdisplay * mipi_dsi_pixel_format_to_bpp(device->format) / 8;
513 val |= SUN6I_DSI_PIXEL_PH_WC(wc);
514 val |= SUN6I_DSI_PIXEL_PH_ECC(sun6i_dsi_ecc_compute(val));
515
516 regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PH_REG, val);
517
518 regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF0_REG,
519 SUN6I_DSI_PIXEL_PF0_CRC_FORCE(0xffff));
520
521 regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF1_REG,
522 SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(0xffff) |
523 SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(0xffff));
524
525 regmap_write(dsi->regs, SUN6I_DSI_PIXEL_CTL0_REG,
526 SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE |
527 SUN6I_DSI_PIXEL_CTL0_FORMAT(fmt));
528 }
529
sun6i_dsi_setup_timings(struct sun6i_dsi * dsi,struct drm_display_mode * mode)530 static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
531 struct drm_display_mode *mode)
532 {
533 struct mipi_dsi_device *device = dsi->device;
534 int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
535 u16 hbp = 0, hfp = 0, hsa = 0, hblk = 0, vblk = 0;
536 u32 basic_ctl = 0;
537 size_t bytes;
538 u8 *buffer;
539
540 /* Do all timing calculations up front to allocate buffer space */
541
542 if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
543 hblk = mode->hdisplay * Bpp;
544 basic_ctl = SUN6I_DSI_BASIC_CTL_VIDEO_BURST |
545 SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS |
546 SUN6I_DSI_BASIC_CTL_HBP_DIS;
547
548 if (device->lanes == 4)
549 basic_ctl |= SUN6I_DSI_BASIC_CTL_TRAIL_FILL |
550 SUN6I_DSI_BASIC_CTL_TRAIL_INV(0xc);
551 } else {
552 /*
553 * A sync period is composed of a blanking packet (4
554 * bytes + payload + 2 bytes) and a sync event packet
555 * (4 bytes). Its minimal size is therefore 10 bytes
556 */
557 #define HSA_PACKET_OVERHEAD 10
558 hsa = max(HSA_PACKET_OVERHEAD,
559 (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
560
561 /*
562 * The backporch is set using a blanking packet (4
563 * bytes + payload + 2 bytes). Its minimal size is
564 * therefore 6 bytes
565 */
566 #define HBP_PACKET_OVERHEAD 6
567 hbp = max(HBP_PACKET_OVERHEAD,
568 (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
569
570 /*
571 * The frontporch is set using a sync event (4 bytes)
572 * and two blanking packets (each one is 4 bytes +
573 * payload + 2 bytes). Its minimal size is therefore
574 * 16 bytes
575 */
576 #define HFP_PACKET_OVERHEAD 16
577 hfp = max(HFP_PACKET_OVERHEAD,
578 (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
579
580 /*
581 * The blanking is set using a sync event (4 bytes)
582 * and a blanking packet (4 bytes + payload + 2
583 * bytes). Its minimal size is therefore 10 bytes.
584 */
585 #define HBLK_PACKET_OVERHEAD 10
586 hblk = max(HBLK_PACKET_OVERHEAD,
587 (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp -
588 HBLK_PACKET_OVERHEAD);
589
590 /*
591 * And I'm not entirely sure what vblk is about. The driver in
592 * Allwinner BSP is using a rather convoluted calculation
593 * there only for 4 lanes. However, using 0 (the !4 lanes
594 * case) even with a 4 lanes screen seems to work...
595 */
596 vblk = 0;
597 }
598
599 /* How many bytes do we need to send all payloads? */
600 bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
601 buffer = kmalloc(bytes, GFP_KERNEL);
602 if (WARN_ON(!buffer))
603 return;
604
605 regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, basic_ctl);
606
607 regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
608 sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,
609 device->channel,
610 0, 0));
611
612 regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSE_REG,
613 sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_END,
614 device->channel,
615 0, 0));
616
617 regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSS_REG,
618 sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_START,
619 device->channel,
620 0, 0));
621
622 regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSE_REG,
623 sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_END,
624 device->channel,
625 0, 0));
626
627 regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE0_REG,
628 SUN6I_DSI_BASIC_SIZE0_VSA(mode->vsync_end -
629 mode->vsync_start) |
630 SUN6I_DSI_BASIC_SIZE0_VBP(mode->vtotal -
631 mode->vsync_end));
632
633 regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE1_REG,
634 SUN6I_DSI_BASIC_SIZE1_VACT(mode->vdisplay) |
635 SUN6I_DSI_BASIC_SIZE1_VT(mode->vtotal));
636
637 /* sync */
638 regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA0_REG,
639 sun6i_dsi_build_blk0_pkt(device->channel, hsa));
640 regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA1_REG,
641 sun6i_dsi_build_blk1_pkt(0, buffer, hsa));
642
643 /* backporch */
644 regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP0_REG,
645 sun6i_dsi_build_blk0_pkt(device->channel, hbp));
646 regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP1_REG,
647 sun6i_dsi_build_blk1_pkt(0, buffer, hbp));
648
649 /* frontporch */
650 regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP0_REG,
651 sun6i_dsi_build_blk0_pkt(device->channel, hfp));
652 regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP1_REG,
653 sun6i_dsi_build_blk1_pkt(0, buffer, hfp));
654
655 /* hblk */
656 regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK0_REG,
657 sun6i_dsi_build_blk0_pkt(device->channel, hblk));
658 regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK1_REG,
659 sun6i_dsi_build_blk1_pkt(0, buffer, hblk));
660
661 /* vblk */
662 regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK0_REG,
663 sun6i_dsi_build_blk0_pkt(device->channel, vblk));
664 regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK1_REG,
665 sun6i_dsi_build_blk1_pkt(0, buffer, vblk));
666
667 kfree(buffer);
668 }
669
sun6i_dsi_start(struct sun6i_dsi * dsi,enum sun6i_dsi_start_inst func)670 static int sun6i_dsi_start(struct sun6i_dsi *dsi,
671 enum sun6i_dsi_start_inst func)
672 {
673 switch (func) {
674 case DSI_START_LPTX:
675 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
676 DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
677 DSI_INST_ID_END << (4 * DSI_INST_ID_LPDT));
678 break;
679 case DSI_START_LPRX:
680 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
681 DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
682 DSI_INST_ID_DLY << (4 * DSI_INST_ID_LPDT) |
683 DSI_INST_ID_TBA << (4 * DSI_INST_ID_DLY) |
684 DSI_INST_ID_END << (4 * DSI_INST_ID_TBA));
685 break;
686 case DSI_START_HSC:
687 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
688 DSI_INST_ID_HSC << (4 * DSI_INST_ID_LP11) |
689 DSI_INST_ID_END << (4 * DSI_INST_ID_HSC));
690 break;
691 case DSI_START_HSD:
692 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
693 DSI_INST_ID_NOP << (4 * DSI_INST_ID_LP11) |
694 DSI_INST_ID_HSD << (4 * DSI_INST_ID_NOP) |
695 DSI_INST_ID_DLY << (4 * DSI_INST_ID_HSD) |
696 DSI_INST_ID_NOP << (4 * DSI_INST_ID_DLY) |
697 DSI_INST_ID_END << (4 * DSI_INST_ID_HSCEXIT));
698 break;
699 default:
700 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
701 DSI_INST_ID_END << (4 * DSI_INST_ID_LP11));
702 break;
703 }
704
705 sun6i_dsi_inst_abort(dsi);
706 sun6i_dsi_inst_commit(dsi);
707
708 if (func == DSI_START_HSC)
709 regmap_write_bits(dsi->regs,
710 SUN6I_DSI_INST_FUNC_REG(DSI_INST_ID_LP11),
711 SUN6I_DSI_INST_FUNC_LANE_CEN, 0);
712
713 return 0;
714 }
715
sun6i_dsi_encoder_enable(struct drm_encoder * encoder)716 static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
717 {
718 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
719 struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
720 struct mipi_dsi_device *device = dsi->device;
721 union phy_configure_opts opts = { };
722 struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
723 u16 delay;
724 int err;
725
726 DRM_DEBUG_DRIVER("Enabling DSI output\n");
727
728 err = regulator_enable(dsi->regulator);
729 if (err)
730 dev_warn(dsi->dev, "failed to enable VCC-DSI supply: %d\n", err);
731
732 reset_control_deassert(dsi->reset);
733 clk_prepare_enable(dsi->mod_clk);
734
735 /*
736 * Enable the DSI block.
737 */
738 regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN);
739
740 regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
741 SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN);
742
743 regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10);
744 regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0);
745
746 sun6i_dsi_inst_init(dsi, dsi->device);
747
748 regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff);
749
750 delay = sun6i_dsi_get_video_start_delay(dsi, mode);
751 regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL1_REG,
752 SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(delay) |
753 SUN6I_DSI_BASIC_CTL1_VIDEO_FILL |
754 SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION |
755 SUN6I_DSI_BASIC_CTL1_VIDEO_MODE);
756
757 sun6i_dsi_setup_burst(dsi, mode);
758 sun6i_dsi_setup_inst_loop(dsi, mode);
759 sun6i_dsi_setup_format(dsi, mode);
760 sun6i_dsi_setup_timings(dsi, mode);
761
762 phy_init(dsi->dphy);
763
764 phy_mipi_dphy_get_default_config(mode->clock * 1000,
765 mipi_dsi_pixel_format_to_bpp(device->format),
766 device->lanes, cfg);
767
768 phy_set_mode(dsi->dphy, PHY_MODE_MIPI_DPHY);
769 phy_configure(dsi->dphy, &opts);
770 phy_power_on(dsi->dphy);
771
772 if (dsi->panel)
773 drm_panel_prepare(dsi->panel);
774
775 /*
776 * FIXME: This should be moved after the switch to HS mode.
777 *
778 * Unfortunately, once in HS mode, it seems like we're not
779 * able to send DCS commands anymore, which would prevent any
780 * panel to send any DCS command as part as their enable
781 * method, which is quite common.
782 *
783 * I haven't seen any artifact due to that sub-optimal
784 * ordering on the panels I've tested it with, so I guess this
785 * will do for now, until that IP is better understood.
786 */
787 if (dsi->panel)
788 drm_panel_enable(dsi->panel);
789
790 sun6i_dsi_start(dsi, DSI_START_HSC);
791
792 udelay(1000);
793
794 sun6i_dsi_start(dsi, DSI_START_HSD);
795 }
796
sun6i_dsi_encoder_disable(struct drm_encoder * encoder)797 static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
798 {
799 struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
800
801 DRM_DEBUG_DRIVER("Disabling DSI output\n");
802
803 if (dsi->panel) {
804 drm_panel_disable(dsi->panel);
805 drm_panel_unprepare(dsi->panel);
806 }
807
808 phy_power_off(dsi->dphy);
809 phy_exit(dsi->dphy);
810
811 clk_disable_unprepare(dsi->mod_clk);
812 reset_control_assert(dsi->reset);
813 regulator_disable(dsi->regulator);
814 }
815
sun6i_dsi_get_modes(struct drm_connector * connector)816 static int sun6i_dsi_get_modes(struct drm_connector *connector)
817 {
818 struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector);
819
820 return drm_panel_get_modes(dsi->panel, connector);
821 }
822
823 static const struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
824 .get_modes = sun6i_dsi_get_modes,
825 };
826
827 static enum drm_connector_status
sun6i_dsi_connector_detect(struct drm_connector * connector,bool force)828 sun6i_dsi_connector_detect(struct drm_connector *connector, bool force)
829 {
830 struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector);
831
832 return dsi->panel ? connector_status_connected :
833 connector_status_disconnected;
834 }
835
836 static const struct drm_connector_funcs sun6i_dsi_connector_funcs = {
837 .detect = sun6i_dsi_connector_detect,
838 .fill_modes = drm_helper_probe_single_connector_modes,
839 .destroy = drm_connector_cleanup,
840 .reset = drm_atomic_helper_connector_reset,
841 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
842 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
843 };
844
845 static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
846 .disable = sun6i_dsi_encoder_disable,
847 .enable = sun6i_dsi_encoder_enable,
848 };
849
sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi * dsi,const struct mipi_dsi_msg * msg)850 static u32 sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi *dsi,
851 const struct mipi_dsi_msg *msg)
852 {
853 u32 pkt = msg->type;
854
855 if (msg->type == MIPI_DSI_DCS_LONG_WRITE) {
856 pkt |= ((msg->tx_len) & 0xffff) << 8;
857 pkt |= (((msg->tx_len) >> 8) & 0xffff) << 16;
858 } else {
859 pkt |= (((u8 *)msg->tx_buf)[0] << 8);
860 if (msg->tx_len > 1)
861 pkt |= (((u8 *)msg->tx_buf)[1] << 16);
862 }
863
864 pkt |= sun6i_dsi_ecc_compute(pkt) << 24;
865
866 return pkt;
867 }
868
sun6i_dsi_dcs_write_short(struct sun6i_dsi * dsi,const struct mipi_dsi_msg * msg)869 static int sun6i_dsi_dcs_write_short(struct sun6i_dsi *dsi,
870 const struct mipi_dsi_msg *msg)
871 {
872 regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
873 sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
874 regmap_write_bits(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
875 0xff, (4 - 1));
876
877 sun6i_dsi_start(dsi, DSI_START_LPTX);
878
879 return msg->tx_len;
880 }
881
sun6i_dsi_dcs_write_long(struct sun6i_dsi * dsi,const struct mipi_dsi_msg * msg)882 static int sun6i_dsi_dcs_write_long(struct sun6i_dsi *dsi,
883 const struct mipi_dsi_msg *msg)
884 {
885 int ret, len = 0;
886 u8 *bounce;
887 u16 crc;
888
889 regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
890 sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
891
892 bounce = kzalloc(ALIGN(msg->tx_len + sizeof(crc), 4), GFP_KERNEL);
893 if (!bounce)
894 return -ENOMEM;
895
896 memcpy(bounce, msg->tx_buf, msg->tx_len);
897 len += msg->tx_len;
898
899 crc = sun6i_dsi_crc_compute(bounce, msg->tx_len);
900 memcpy((u8 *)bounce + msg->tx_len, &crc, sizeof(crc));
901 len += sizeof(crc);
902
903 regmap_bulk_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(1), bounce, DIV_ROUND_UP(len, 4));
904 regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG, len + 4 - 1);
905 kfree(bounce);
906
907 sun6i_dsi_start(dsi, DSI_START_LPTX);
908
909 ret = sun6i_dsi_inst_wait_for_completion(dsi);
910 if (ret < 0) {
911 sun6i_dsi_inst_abort(dsi);
912 return ret;
913 }
914
915 /*
916 * TODO: There's some bits (reg 0x200, bits 8/9) that
917 * apparently can be used to check whether the data have been
918 * sent, but I couldn't get it to work reliably.
919 */
920 return msg->tx_len;
921 }
922
sun6i_dsi_dcs_read(struct sun6i_dsi * dsi,const struct mipi_dsi_msg * msg)923 static int sun6i_dsi_dcs_read(struct sun6i_dsi *dsi,
924 const struct mipi_dsi_msg *msg)
925 {
926 u32 val;
927 int ret;
928 u8 byte0;
929
930 regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
931 sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
932 regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
933 (4 - 1));
934
935 sun6i_dsi_start(dsi, DSI_START_LPRX);
936
937 ret = sun6i_dsi_inst_wait_for_completion(dsi);
938 if (ret < 0) {
939 sun6i_dsi_inst_abort(dsi);
940 return ret;
941 }
942
943 /*
944 * TODO: There's some bits (reg 0x200, bits 24/25) that
945 * apparently can be used to check whether the data have been
946 * received, but I couldn't get it to work reliably.
947 */
948 regmap_read(dsi->regs, SUN6I_DSI_CMD_CTL_REG, &val);
949 if (val & SUN6I_DSI_CMD_CTL_RX_OVERFLOW)
950 return -EIO;
951
952 regmap_read(dsi->regs, SUN6I_DSI_CMD_RX_REG(0), &val);
953 byte0 = val & 0xff;
954 if (byte0 == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT)
955 return -EIO;
956
957 ((u8 *)msg->rx_buf)[0] = (val >> 8);
958
959 return 1;
960 }
961
sun6i_dsi_attach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)962 static int sun6i_dsi_attach(struct mipi_dsi_host *host,
963 struct mipi_dsi_device *device)
964 {
965 struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
966 struct drm_panel *panel = of_drm_find_panel(device->dev.of_node);
967
968 if (IS_ERR(panel))
969 return PTR_ERR(panel);
970 if (!dsi->drm || !dsi->drm->registered)
971 return -EPROBE_DEFER;
972
973 dsi->panel = panel;
974 dsi->device = device;
975
976 drm_kms_helper_hotplug_event(dsi->drm);
977
978 dev_info(host->dev, "Attached device %s\n", device->name);
979
980 return 0;
981 }
982
sun6i_dsi_detach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)983 static int sun6i_dsi_detach(struct mipi_dsi_host *host,
984 struct mipi_dsi_device *device)
985 {
986 struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
987
988 dsi->panel = NULL;
989 dsi->device = NULL;
990
991 drm_kms_helper_hotplug_event(dsi->drm);
992
993 return 0;
994 }
995
sun6i_dsi_transfer(struct mipi_dsi_host * host,const struct mipi_dsi_msg * msg)996 static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
997 const struct mipi_dsi_msg *msg)
998 {
999 struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
1000 int ret;
1001
1002 ret = sun6i_dsi_inst_wait_for_completion(dsi);
1003 if (ret < 0)
1004 sun6i_dsi_inst_abort(dsi);
1005
1006 regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
1007 SUN6I_DSI_CMD_CTL_RX_OVERFLOW |
1008 SUN6I_DSI_CMD_CTL_RX_FLAG |
1009 SUN6I_DSI_CMD_CTL_TX_FLAG);
1010
1011 switch (msg->type) {
1012 case MIPI_DSI_DCS_SHORT_WRITE:
1013 case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
1014 case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
1015 ret = sun6i_dsi_dcs_write_short(dsi, msg);
1016 break;
1017
1018 case MIPI_DSI_DCS_LONG_WRITE:
1019 ret = sun6i_dsi_dcs_write_long(dsi, msg);
1020 break;
1021
1022 case MIPI_DSI_DCS_READ:
1023 if (msg->rx_len == 1) {
1024 ret = sun6i_dsi_dcs_read(dsi, msg);
1025 break;
1026 }
1027 fallthrough;
1028
1029 default:
1030 ret = -EINVAL;
1031 }
1032
1033 return ret;
1034 }
1035
1036 static const struct mipi_dsi_host_ops sun6i_dsi_host_ops = {
1037 .attach = sun6i_dsi_attach,
1038 .detach = sun6i_dsi_detach,
1039 .transfer = sun6i_dsi_transfer,
1040 };
1041
1042 static const struct regmap_config sun6i_dsi_regmap_config = {
1043 .reg_bits = 32,
1044 .val_bits = 32,
1045 .reg_stride = 4,
1046 .max_register = SUN6I_DSI_CMD_TX_REG(255),
1047 .name = "mipi-dsi",
1048 };
1049
sun6i_dsi_bind(struct device * dev,struct device * master,void * data)1050 static int sun6i_dsi_bind(struct device *dev, struct device *master,
1051 void *data)
1052 {
1053 struct drm_device *drm = data;
1054 struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1055 int ret;
1056
1057 drm_encoder_helper_add(&dsi->encoder,
1058 &sun6i_dsi_enc_helper_funcs);
1059 ret = drm_simple_encoder_init(drm, &dsi->encoder,
1060 DRM_MODE_ENCODER_DSI);
1061 if (ret) {
1062 dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n");
1063 return ret;
1064 }
1065 dsi->encoder.possible_crtcs = BIT(0);
1066
1067 drm_connector_helper_add(&dsi->connector,
1068 &sun6i_dsi_connector_helper_funcs);
1069 ret = drm_connector_init(drm, &dsi->connector,
1070 &sun6i_dsi_connector_funcs,
1071 DRM_MODE_CONNECTOR_DSI);
1072 if (ret) {
1073 dev_err(dsi->dev,
1074 "Couldn't initialise the DSI connector\n");
1075 goto err_cleanup_connector;
1076 }
1077
1078 drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
1079
1080 dsi->drm = drm;
1081
1082 return 0;
1083
1084 err_cleanup_connector:
1085 drm_encoder_cleanup(&dsi->encoder);
1086 return ret;
1087 }
1088
sun6i_dsi_unbind(struct device * dev,struct device * master,void * data)1089 static void sun6i_dsi_unbind(struct device *dev, struct device *master,
1090 void *data)
1091 {
1092 struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1093
1094 dsi->drm = NULL;
1095 }
1096
1097 static const struct component_ops sun6i_dsi_ops = {
1098 .bind = sun6i_dsi_bind,
1099 .unbind = sun6i_dsi_unbind,
1100 };
1101
sun6i_dsi_probe(struct platform_device * pdev)1102 static int sun6i_dsi_probe(struct platform_device *pdev)
1103 {
1104 struct device *dev = &pdev->dev;
1105 const char *bus_clk_name = NULL;
1106 struct sun6i_dsi *dsi;
1107 void __iomem *base;
1108 int ret;
1109
1110 dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
1111 if (!dsi)
1112 return -ENOMEM;
1113 dev_set_drvdata(dev, dsi);
1114 dsi->dev = dev;
1115 dsi->host.ops = &sun6i_dsi_host_ops;
1116 dsi->host.dev = dev;
1117
1118 if (of_device_is_compatible(dev->of_node,
1119 "allwinner,sun6i-a31-mipi-dsi"))
1120 bus_clk_name = "bus";
1121
1122 base = devm_platform_ioremap_resource(pdev, 0);
1123 if (IS_ERR(base)) {
1124 dev_err(dev, "Couldn't map the DSI encoder registers\n");
1125 return PTR_ERR(base);
1126 }
1127
1128 dsi->regulator = devm_regulator_get(dev, "vcc-dsi");
1129 if (IS_ERR(dsi->regulator))
1130 return dev_err_probe(dev, PTR_ERR(dsi->regulator),
1131 "Couldn't get VCC-DSI supply\n");
1132
1133 dsi->reset = devm_reset_control_get_shared(dev, NULL);
1134 if (IS_ERR(dsi->reset)) {
1135 dev_err(dev, "Couldn't get our reset line\n");
1136 return PTR_ERR(dsi->reset);
1137 }
1138
1139 dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
1140 if (IS_ERR(dsi->regs)) {
1141 dev_err(dev, "Couldn't init regmap\n");
1142 return PTR_ERR(dsi->regs);
1143 }
1144
1145 dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
1146 if (IS_ERR(dsi->bus_clk))
1147 return dev_err_probe(dev, PTR_ERR(dsi->bus_clk),
1148 "Couldn't get the DSI bus clock\n");
1149
1150 ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
1151 if (ret)
1152 return ret;
1153
1154 if (of_device_is_compatible(dev->of_node,
1155 "allwinner,sun6i-a31-mipi-dsi")) {
1156 dsi->mod_clk = devm_clk_get(dev, "mod");
1157 if (IS_ERR(dsi->mod_clk)) {
1158 dev_err(dev, "Couldn't get the DSI mod clock\n");
1159 ret = PTR_ERR(dsi->mod_clk);
1160 goto err_attach_clk;
1161 }
1162 }
1163
1164 /*
1165 * In order to operate properly, that clock seems to be always
1166 * set to 297MHz.
1167 */
1168 clk_set_rate_exclusive(dsi->mod_clk, 297000000);
1169
1170 dsi->dphy = devm_phy_get(dev, "dphy");
1171 if (IS_ERR(dsi->dphy)) {
1172 dev_err(dev, "Couldn't get the MIPI D-PHY\n");
1173 ret = PTR_ERR(dsi->dphy);
1174 goto err_unprotect_clk;
1175 }
1176
1177 ret = mipi_dsi_host_register(&dsi->host);
1178 if (ret) {
1179 dev_err(dev, "Couldn't register MIPI-DSI host\n");
1180 goto err_unprotect_clk;
1181 }
1182
1183 ret = component_add(&pdev->dev, &sun6i_dsi_ops);
1184 if (ret) {
1185 dev_err(dev, "Couldn't register our component\n");
1186 goto err_remove_dsi_host;
1187 }
1188
1189 return 0;
1190
1191 err_remove_dsi_host:
1192 mipi_dsi_host_unregister(&dsi->host);
1193 err_unprotect_clk:
1194 clk_rate_exclusive_put(dsi->mod_clk);
1195 err_attach_clk:
1196 regmap_mmio_detach_clk(dsi->regs);
1197
1198 return ret;
1199 }
1200
sun6i_dsi_remove(struct platform_device * pdev)1201 static int sun6i_dsi_remove(struct platform_device *pdev)
1202 {
1203 struct device *dev = &pdev->dev;
1204 struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1205
1206 component_del(&pdev->dev, &sun6i_dsi_ops);
1207 mipi_dsi_host_unregister(&dsi->host);
1208 clk_rate_exclusive_put(dsi->mod_clk);
1209
1210 regmap_mmio_detach_clk(dsi->regs);
1211
1212 return 0;
1213 }
1214
1215 static const struct of_device_id sun6i_dsi_of_table[] = {
1216 { .compatible = "allwinner,sun6i-a31-mipi-dsi" },
1217 { .compatible = "allwinner,sun50i-a64-mipi-dsi" },
1218 { }
1219 };
1220 MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
1221
1222 static struct platform_driver sun6i_dsi_platform_driver = {
1223 .probe = sun6i_dsi_probe,
1224 .remove = sun6i_dsi_remove,
1225 .driver = {
1226 .name = "sun6i-mipi-dsi",
1227 .of_match_table = sun6i_dsi_of_table,
1228 },
1229 };
1230 module_platform_driver(sun6i_dsi_platform_driver);
1231
1232 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1233 MODULE_DESCRIPTION("Allwinner A31 DSI Driver");
1234 MODULE_LICENSE("GPL");
1235