Merge branch 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.git] / drivers / gpu / drm / bridge / synopsys / dw-mipi-dsi.c
1 /*
2  * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
3  * Copyright (C) STMicroelectronics SA 2017
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * Modified by Philippe Cornu <philippe.cornu@st.com>
11  * This generic Synopsys DesignWare MIPI DSI host driver is based on the
12  * Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
13  */
14
15 #include <linux/clk.h>
16 #include <linux/component.h>
17 #include <linux/iopoll.h>
18 #include <linux/module.h>
19 #include <linux/of_device.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/reset.h>
22 #include <drm/drmP.h>
23 #include <drm/drm_atomic_helper.h>
24 #include <drm/drm_bridge.h>
25 #include <drm/drm_crtc.h>
26 #include <drm/drm_crtc_helper.h>
27 #include <drm/drm_mipi_dsi.h>
28 #include <drm/drm_of.h>
29 #include <drm/bridge/dw_mipi_dsi.h>
30 #include <video/mipi_display.h>
31
32 #define DSI_VERSION                     0x00
33 #define DSI_PWR_UP                      0x04
34 #define RESET                           0
35 #define POWERUP                         BIT(0)
36
37 #define DSI_CLKMGR_CFG                  0x08
38 #define TO_CLK_DIVIDSION(div)           (((div) & 0xff) << 8)
39 #define TX_ESC_CLK_DIVIDSION(div)       (((div) & 0xff) << 0)
40
41 #define DSI_DPI_VCID                    0x0c
42 #define DPI_VID(vid)                    (((vid) & 0x3) << 0)
43
44 #define DSI_DPI_COLOR_CODING            0x10
45 #define EN18_LOOSELY                    BIT(8)
46 #define DPI_COLOR_CODING_16BIT_1        0x0
47 #define DPI_COLOR_CODING_16BIT_2        0x1
48 #define DPI_COLOR_CODING_16BIT_3        0x2
49 #define DPI_COLOR_CODING_18BIT_1        0x3
50 #define DPI_COLOR_CODING_18BIT_2        0x4
51 #define DPI_COLOR_CODING_24BIT          0x5
52
53 #define DSI_DPI_CFG_POL                 0x14
54 #define COLORM_ACTIVE_LOW               BIT(4)
55 #define SHUTD_ACTIVE_LOW                BIT(3)
56 #define HSYNC_ACTIVE_LOW                BIT(2)
57 #define VSYNC_ACTIVE_LOW                BIT(1)
58 #define DATAEN_ACTIVE_LOW               BIT(0)
59
60 #define DSI_DPI_LP_CMD_TIM              0x18
61 #define OUTVACT_LPCMD_TIME(p)           (((p) & 0xff) << 16)
62 #define INVACT_LPCMD_TIME(p)            ((p) & 0xff)
63
64 #define DSI_DBI_CFG                     0x20
65 #define DSI_DBI_CMDSIZE                 0x28
66
67 #define DSI_PCKHDL_CFG                  0x2c
68 #define EN_CRC_RX                       BIT(4)
69 #define EN_ECC_RX                       BIT(3)
70 #define EN_BTA                          BIT(2)
71 #define EN_EOTP_RX                      BIT(1)
72 #define EN_EOTP_TX                      BIT(0)
73
74 #define DSI_MODE_CFG                    0x34
75 #define ENABLE_VIDEO_MODE               0
76 #define ENABLE_CMD_MODE                 BIT(0)
77
78 #define DSI_VID_MODE_CFG                0x38
79 #define FRAME_BTA_ACK                   BIT(14)
80 #define ENABLE_LOW_POWER                (0x3f << 8)
81 #define ENABLE_LOW_POWER_MASK           (0x3f << 8)
82 #define VID_MODE_TYPE_NON_BURST_SYNC_PULSES     0x0
83 #define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS     0x1
84 #define VID_MODE_TYPE_BURST                     0x2
85 #define VID_MODE_TYPE_MASK                      0x3
86
87 #define DSI_VID_PKT_SIZE                0x3c
88 #define VID_PKT_SIZE(p)                 (((p) & 0x3fff) << 0)
89 #define VID_PKT_MAX_SIZE                0x3fff
90
91 #define DSI_VID_HSA_TIME                0x48
92 #define DSI_VID_HBP_TIME                0x4c
93 #define DSI_VID_HLINE_TIME              0x50
94 #define DSI_VID_VSA_LINES               0x54
95 #define DSI_VID_VBP_LINES               0x58
96 #define DSI_VID_VFP_LINES               0x5c
97 #define DSI_VID_VACTIVE_LINES           0x60
98 #define DSI_CMD_MODE_CFG                0x68
99 #define MAX_RD_PKT_SIZE_LP              BIT(24)
100 #define DCS_LW_TX_LP                    BIT(19)
101 #define DCS_SR_0P_TX_LP                 BIT(18)
102 #define DCS_SW_1P_TX_LP                 BIT(17)
103 #define DCS_SW_0P_TX_LP                 BIT(16)
104 #define GEN_LW_TX_LP                    BIT(14)
105 #define GEN_SR_2P_TX_LP                 BIT(13)
106 #define GEN_SR_1P_TX_LP                 BIT(12)
107 #define GEN_SR_0P_TX_LP                 BIT(11)
108 #define GEN_SW_2P_TX_LP                 BIT(10)
109 #define GEN_SW_1P_TX_LP                 BIT(9)
110 #define GEN_SW_0P_TX_LP                 BIT(8)
111 #define EN_ACK_RQST                     BIT(1)
112 #define EN_TEAR_FX                      BIT(0)
113
114 #define CMD_MODE_ALL_LP                 (MAX_RD_PKT_SIZE_LP | \
115                                          DCS_LW_TX_LP | \
116                                          DCS_SR_0P_TX_LP | \
117                                          DCS_SW_1P_TX_LP | \
118                                          DCS_SW_0P_TX_LP | \
119                                          GEN_LW_TX_LP | \
120                                          GEN_SR_2P_TX_LP | \
121                                          GEN_SR_1P_TX_LP | \
122                                          GEN_SR_0P_TX_LP | \
123                                          GEN_SW_2P_TX_LP | \
124                                          GEN_SW_1P_TX_LP | \
125                                          GEN_SW_0P_TX_LP)
126
127 #define DSI_GEN_HDR                     0x6c
128 #define GEN_HDATA(data)                 (((data) & 0xffff) << 8)
129 #define GEN_HDATA_MASK                  (0xffff << 8)
130 #define GEN_HTYPE(type)                 (((type) & 0xff) << 0)
131 #define GEN_HTYPE_MASK                  0xff
132
133 #define DSI_GEN_PLD_DATA                0x70
134
135 #define DSI_CMD_PKT_STATUS              0x74
136 #define GEN_CMD_EMPTY                   BIT(0)
137 #define GEN_CMD_FULL                    BIT(1)
138 #define GEN_PLD_W_EMPTY                 BIT(2)
139 #define GEN_PLD_W_FULL                  BIT(3)
140 #define GEN_PLD_R_EMPTY                 BIT(4)
141 #define GEN_PLD_R_FULL                  BIT(5)
142 #define GEN_RD_CMD_BUSY                 BIT(6)
143
144 #define DSI_TO_CNT_CFG                  0x78
145 #define HSTX_TO_CNT(p)                  (((p) & 0xffff) << 16)
146 #define LPRX_TO_CNT(p)                  ((p) & 0xffff)
147
148 #define DSI_BTA_TO_CNT                  0x8c
149 #define DSI_LPCLK_CTRL                  0x94
150 #define AUTO_CLKLANE_CTRL               BIT(1)
151 #define PHY_TXREQUESTCLKHS              BIT(0)
152
153 #define DSI_PHY_TMR_LPCLK_CFG           0x98
154 #define PHY_CLKHS2LP_TIME(lbcc)         (((lbcc) & 0x3ff) << 16)
155 #define PHY_CLKLP2HS_TIME(lbcc)         ((lbcc) & 0x3ff)
156
157 #define DSI_PHY_TMR_CFG                 0x9c
158 #define PHY_HS2LP_TIME(lbcc)            (((lbcc) & 0xff) << 24)
159 #define PHY_LP2HS_TIME(lbcc)            (((lbcc) & 0xff) << 16)
160 #define MAX_RD_TIME(lbcc)               ((lbcc) & 0x7fff)
161
162 #define DSI_PHY_RSTZ                    0xa0
163 #define PHY_DISFORCEPLL                 0
164 #define PHY_ENFORCEPLL                  BIT(3)
165 #define PHY_DISABLECLK                  0
166 #define PHY_ENABLECLK                   BIT(2)
167 #define PHY_RSTZ                        0
168 #define PHY_UNRSTZ                      BIT(1)
169 #define PHY_SHUTDOWNZ                   0
170 #define PHY_UNSHUTDOWNZ                 BIT(0)
171
172 #define DSI_PHY_IF_CFG                  0xa4
173 #define N_LANES(n)                      ((((n) - 1) & 0x3) << 0)
174 #define PHY_STOP_WAIT_TIME(cycle)       (((cycle) & 0xff) << 8)
175
176 #define DSI_PHY_STATUS                  0xb0
177 #define LOCK                            BIT(0)
178 #define STOP_STATE_CLK_LANE             BIT(2)
179
180 #define DSI_PHY_TST_CTRL0               0xb4
181 #define PHY_TESTCLK                     BIT(1)
182 #define PHY_UNTESTCLK                   0
183 #define PHY_TESTCLR                     BIT(0)
184 #define PHY_UNTESTCLR                   0
185
186 #define DSI_PHY_TST_CTRL1               0xb8
187 #define PHY_TESTEN                      BIT(16)
188 #define PHY_UNTESTEN                    0
189 #define PHY_TESTDOUT(n)                 (((n) & 0xff) << 8)
190 #define PHY_TESTDIN(n)                  (((n) & 0xff) << 0)
191
192 #define DSI_INT_ST0                     0xbc
193 #define DSI_INT_ST1                     0xc0
194 #define DSI_INT_MSK0                    0xc4
195 #define DSI_INT_MSK1                    0xc8
196
197 #define PHY_STATUS_TIMEOUT_US           10000
198 #define CMD_PKT_STATUS_TIMEOUT_US       20000
199
200 struct dw_mipi_dsi {
201         struct drm_bridge bridge;
202         struct mipi_dsi_host dsi_host;
203         struct drm_bridge *panel_bridge;
204         bool is_panel_bridge;
205         struct device *dev;
206         void __iomem *base;
207
208         struct clk *pclk;
209
210         unsigned int lane_mbps; /* per lane */
211         u32 channel;
212         u32 lanes;
213         u32 format;
214         unsigned long mode_flags;
215
216         const struct dw_mipi_dsi_plat_data *plat_data;
217 };
218
219 /*
220  * The controller should generate 2 frames before
221  * preparing the peripheral.
222  */
223 static void dw_mipi_dsi_wait_for_two_frames(struct drm_display_mode *mode)
224 {
225         int refresh, two_frames;
226
227         refresh = drm_mode_vrefresh(mode);
228         two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2;
229         msleep(two_frames);
230 }
231
232 static inline struct dw_mipi_dsi *host_to_dsi(struct mipi_dsi_host *host)
233 {
234         return container_of(host, struct dw_mipi_dsi, dsi_host);
235 }
236
237 static inline struct dw_mipi_dsi *bridge_to_dsi(struct drm_bridge *bridge)
238 {
239         return container_of(bridge, struct dw_mipi_dsi, bridge);
240 }
241
242 static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val)
243 {
244         writel(val, dsi->base + reg);
245 }
246
247 static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg)
248 {
249         return readl(dsi->base + reg);
250 }
251
252 static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
253                                    struct mipi_dsi_device *device)
254 {
255         struct dw_mipi_dsi *dsi = host_to_dsi(host);
256         struct drm_bridge *bridge;
257         struct drm_panel *panel;
258         int ret;
259
260         if (device->lanes > dsi->plat_data->max_data_lanes) {
261                 dev_err(dsi->dev, "the number of data lanes(%u) is too many\n",
262                         device->lanes);
263                 return -EINVAL;
264         }
265
266         dsi->lanes = device->lanes;
267         dsi->channel = device->channel;
268         dsi->format = device->format;
269         dsi->mode_flags = device->mode_flags;
270
271         ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0,
272                                           &panel, &bridge);
273         if (ret)
274                 return ret;
275
276         if (panel) {
277                 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DSI);
278                 if (IS_ERR(bridge))
279                         return PTR_ERR(bridge);
280                 dsi->is_panel_bridge = true;
281         }
282
283         dsi->panel_bridge = bridge;
284
285         drm_bridge_add(&dsi->bridge);
286
287         return 0;
288 }
289
290 static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
291                                    struct mipi_dsi_device *device)
292 {
293         struct dw_mipi_dsi *dsi = host_to_dsi(host);
294
295         if (dsi->is_panel_bridge)
296                 drm_panel_bridge_remove(dsi->panel_bridge);
297
298         drm_bridge_remove(&dsi->bridge);
299
300         return 0;
301 }
302
303 static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
304                                    const struct mipi_dsi_msg *msg)
305 {
306         bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
307         u32 val = 0;
308
309         if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
310                 val |= EN_ACK_RQST;
311         if (lpm)
312                 val |= CMD_MODE_ALL_LP;
313
314         dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
315         dsi_write(dsi, DSI_CMD_MODE_CFG, val);
316 }
317
318 static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
319 {
320         int ret;
321         u32 val, mask;
322
323         ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
324                                  val, !(val & GEN_CMD_FULL), 1000,
325                                  CMD_PKT_STATUS_TIMEOUT_US);
326         if (ret < 0) {
327                 dev_err(dsi->dev, "failed to get available command FIFO\n");
328                 return ret;
329         }
330
331         dsi_write(dsi, DSI_GEN_HDR, hdr_val);
332
333         mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
334         ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
335                                  val, (val & mask) == mask,
336                                  1000, CMD_PKT_STATUS_TIMEOUT_US);
337         if (ret < 0) {
338                 dev_err(dsi->dev, "failed to write command FIFO\n");
339                 return ret;
340         }
341
342         return 0;
343 }
344
345 static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
346                                        const struct mipi_dsi_msg *msg)
347 {
348         const u8 *tx_buf = msg->tx_buf;
349         u16 data = 0;
350         u32 val;
351
352         if (msg->tx_len > 0)
353                 data |= tx_buf[0];
354         if (msg->tx_len > 1)
355                 data |= tx_buf[1] << 8;
356
357         if (msg->tx_len > 2) {
358                 dev_err(dsi->dev, "too long tx buf length %zu for short write\n",
359                         msg->tx_len);
360                 return -EINVAL;
361         }
362
363         val = GEN_HDATA(data) | GEN_HTYPE(msg->type);
364         return dw_mipi_dsi_gen_pkt_hdr_write(dsi, val);
365 }
366
367 static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
368                                       const struct mipi_dsi_msg *msg)
369 {
370         const u8 *tx_buf = msg->tx_buf;
371         int len = msg->tx_len, pld_data_bytes = sizeof(u32), ret;
372         u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
373         u32 remainder;
374         u32 val;
375
376         if (msg->tx_len < 3) {
377                 dev_err(dsi->dev, "wrong tx buf length %zu for long write\n",
378                         msg->tx_len);
379                 return -EINVAL;
380         }
381
382         while (DIV_ROUND_UP(len, pld_data_bytes)) {
383                 if (len < pld_data_bytes) {
384                         remainder = 0;
385                         memcpy(&remainder, tx_buf, len);
386                         dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
387                         len = 0;
388                 } else {
389                         memcpy(&remainder, tx_buf, pld_data_bytes);
390                         dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
391                         tx_buf += pld_data_bytes;
392                         len -= pld_data_bytes;
393                 }
394
395                 ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
396                                          val, !(val & GEN_PLD_W_FULL), 1000,
397                                          CMD_PKT_STATUS_TIMEOUT_US);
398                 if (ret < 0) {
399                         dev_err(dsi->dev,
400                                 "failed to get available write payload FIFO\n");
401                         return ret;
402                 }
403         }
404
405         return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
406 }
407
408 static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
409                                          const struct mipi_dsi_msg *msg)
410 {
411         struct dw_mipi_dsi *dsi = host_to_dsi(host);
412         int ret;
413
414         /*
415          * TODO dw drv improvements
416          * use mipi_dsi_create_packet() instead of all following
417          * functions and code (no switch cases, no
418          * dw_mipi_dsi_dcs_short_write(), only the loop in long_write...)
419          * and use packet.header...
420          */
421         dw_mipi_message_config(dsi, msg);
422
423         switch (msg->type) {
424         case MIPI_DSI_DCS_SHORT_WRITE:
425         case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
426         case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
427                 ret = dw_mipi_dsi_dcs_short_write(dsi, msg);
428                 break;
429         case MIPI_DSI_DCS_LONG_WRITE:
430                 ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
431                 break;
432         default:
433                 dev_err(dsi->dev, "unsupported message type 0x%02x\n",
434                         msg->type);
435                 ret = -EINVAL;
436         }
437
438         return ret;
439 }
440
441 static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = {
442         .attach = dw_mipi_dsi_host_attach,
443         .detach = dw_mipi_dsi_host_detach,
444         .transfer = dw_mipi_dsi_host_transfer,
445 };
446
447 static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
448 {
449         u32 val;
450
451         /*
452          * TODO dw drv improvements
453          * enabling low power is panel-dependent, we should use the
454          * panel configuration here...
455          */
456         val = ENABLE_LOW_POWER;
457
458         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
459                 val |= VID_MODE_TYPE_BURST;
460         else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
461                 val |= VID_MODE_TYPE_NON_BURST_SYNC_PULSES;
462         else
463                 val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
464
465         dsi_write(dsi, DSI_VID_MODE_CFG, val);
466 }
467
468 static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
469                                  unsigned long mode_flags)
470 {
471         dsi_write(dsi, DSI_PWR_UP, RESET);
472
473         if (mode_flags & MIPI_DSI_MODE_VIDEO) {
474                 dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
475                 dw_mipi_dsi_video_mode_config(dsi);
476                 dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
477         } else {
478                 dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
479         }
480
481         dsi_write(dsi, DSI_PWR_UP, POWERUP);
482 }
483
484 static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
485 {
486         dsi_write(dsi, DSI_PWR_UP, RESET);
487         dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
488 }
489
490 static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
491 {
492         /*
493          * The maximum permitted escape clock is 20MHz and it is derived from
494          * lanebyteclk, which is running at "lane_mbps / 8".  Thus we want:
495          *
496          *     (lane_mbps >> 3) / esc_clk_division < 20
497          * which is:
498          *     (lane_mbps >> 3) / 20 > esc_clk_division
499          */
500         u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
501
502         dsi_write(dsi, DSI_PWR_UP, RESET);
503
504         /*
505          * TODO dw drv improvements
506          * timeout clock division should be computed with the
507          * high speed transmission counter timeout and byte lane...
508          */
509         dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
510                   TX_ESC_CLK_DIVIDSION(esc_clk_division));
511 }
512
513 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
514                                    struct drm_display_mode *mode)
515 {
516         u32 val = 0, color = 0;
517
518         switch (dsi->format) {
519         case MIPI_DSI_FMT_RGB888:
520                 color = DPI_COLOR_CODING_24BIT;
521                 break;
522         case MIPI_DSI_FMT_RGB666:
523                 color = DPI_COLOR_CODING_18BIT_2 | EN18_LOOSELY;
524                 break;
525         case MIPI_DSI_FMT_RGB666_PACKED:
526                 color = DPI_COLOR_CODING_18BIT_1;
527                 break;
528         case MIPI_DSI_FMT_RGB565:
529                 color = DPI_COLOR_CODING_16BIT_1;
530                 break;
531         }
532
533         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
534                 val |= VSYNC_ACTIVE_LOW;
535         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
536                 val |= HSYNC_ACTIVE_LOW;
537
538         dsi_write(dsi, DSI_DPI_VCID, DPI_VID(dsi->channel));
539         dsi_write(dsi, DSI_DPI_COLOR_CODING, color);
540         dsi_write(dsi, DSI_DPI_CFG_POL, val);
541         /*
542          * TODO dw drv improvements
543          * largest packet sizes during hfp or during vsa/vpb/vfp
544          * should be computed according to byte lane, lane number and only
545          * if sending lp cmds in high speed is enable (PHY_TXREQUESTCLKHS)
546          */
547         dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4)
548                   | INVACT_LPCMD_TIME(4));
549 }
550
551 static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
552 {
553         dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
554 }
555
556 static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
557                                             struct drm_display_mode *mode)
558 {
559         /*
560          * TODO dw drv improvements
561          * only burst mode is supported here. For non-burst video modes,
562          * we should compute DSI_VID_PKT_SIZE, DSI_VCCR.NUMC &
563          * DSI_VNPCR.NPSIZE... especially because this driver supports
564          * non-burst video modes, see dw_mipi_dsi_video_mode_config()...
565          */
566         dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
567 }
568
569 static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
570 {
571         /*
572          * TODO dw drv improvements
573          * compute high speed transmission counter timeout according
574          * to the timeout clock division (TO_CLK_DIVIDSION) and byte lane...
575          */
576         dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
577         /*
578          * TODO dw drv improvements
579          * the Bus-Turn-Around Timeout Counter should be computed
580          * according to byte lane...
581          */
582         dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
583         dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
584 }
585
586 /* Get lane byte clock cycles. */
587 static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
588                                            struct drm_display_mode *mode,
589                                            u32 hcomponent)
590 {
591         u32 frac, lbcc;
592
593         lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
594
595         frac = lbcc % mode->clock;
596         lbcc = lbcc / mode->clock;
597         if (frac)
598                 lbcc++;
599
600         return lbcc;
601 }
602
603 static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
604                                           struct drm_display_mode *mode)
605 {
606         u32 htotal, hsa, hbp, lbcc;
607
608         htotal = mode->htotal;
609         hsa = mode->hsync_end - mode->hsync_start;
610         hbp = mode->htotal - mode->hsync_end;
611
612         /*
613          * TODO dw drv improvements
614          * computations below may be improved...
615          */
616         lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, htotal);
617         dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc);
618
619         lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hsa);
620         dsi_write(dsi, DSI_VID_HSA_TIME, lbcc);
621
622         lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hbp);
623         dsi_write(dsi, DSI_VID_HBP_TIME, lbcc);
624 }
625
626 static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
627                                                struct drm_display_mode *mode)
628 {
629         u32 vactive, vsa, vfp, vbp;
630
631         vactive = mode->vdisplay;
632         vsa = mode->vsync_end - mode->vsync_start;
633         vfp = mode->vsync_start - mode->vdisplay;
634         vbp = mode->vtotal - mode->vsync_end;
635
636         dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive);
637         dsi_write(dsi, DSI_VID_VSA_LINES, vsa);
638         dsi_write(dsi, DSI_VID_VFP_LINES, vfp);
639         dsi_write(dsi, DSI_VID_VBP_LINES, vbp);
640 }
641
642 static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
643 {
644         /*
645          * TODO dw drv improvements
646          * data & clock lane timers should be computed according to panel
647          * blankings and to the automatic clock lane control mode...
648          * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
649          * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
650          */
651         dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
652                   | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
653
654         dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
655                   | PHY_CLKLP2HS_TIME(0x40));
656 }
657
658 static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
659 {
660         /*
661          * TODO dw drv improvements
662          * stop wait time should be the maximum between host dsi
663          * and panel stop wait times
664          */
665         dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) |
666                   N_LANES(dsi->lanes));
667 }
668
669 static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi)
670 {
671         /* Clear PHY state */
672         dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
673                   | PHY_RSTZ | PHY_SHUTDOWNZ);
674         dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
675         dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
676         dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
677 }
678
679 static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi)
680 {
681         u32 val;
682         int ret;
683
684         dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
685                   PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
686
687         ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
688                                  val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
689         if (ret < 0)
690                 DRM_DEBUG_DRIVER("failed to wait phy lock state\n");
691
692         ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
693                                  val, val & STOP_STATE_CLK_LANE, 1000,
694                                  PHY_STATUS_TIMEOUT_US);
695         if (ret < 0)
696                 DRM_DEBUG_DRIVER("failed to wait phy clk lane stop state\n");
697 }
698
699 static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi)
700 {
701         dsi_read(dsi, DSI_INT_ST0);
702         dsi_read(dsi, DSI_INT_ST1);
703         dsi_write(dsi, DSI_INT_MSK0, 0);
704         dsi_write(dsi, DSI_INT_MSK1, 0);
705 }
706
707 static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
708 {
709         struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
710
711         /*
712          * Switch to command mode before panel-bridge post_disable &
713          * panel unprepare.
714          * Note: panel-bridge disable & panel disable has been called
715          * before by the drm framework.
716          */
717         dw_mipi_dsi_set_mode(dsi, 0);
718
719         /*
720          * TODO Only way found to call panel-bridge post_disable &
721          * panel unprepare before the dsi "final" disable...
722          * This needs to be fixed in the drm_bridge framework and the API
723          * needs to be updated to manage our own call chains...
724          */
725         dsi->panel_bridge->funcs->post_disable(dsi->panel_bridge);
726
727         dw_mipi_dsi_disable(dsi);
728         clk_disable_unprepare(dsi->pclk);
729         pm_runtime_put(dsi->dev);
730 }
731
732 void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
733                                  struct drm_display_mode *mode,
734                                  struct drm_display_mode *adjusted_mode)
735 {
736         struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
737         const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
738         void *priv_data = dsi->plat_data->priv_data;
739         int ret;
740
741         clk_prepare_enable(dsi->pclk);
742
743         ret = phy_ops->get_lane_mbps(priv_data, mode, dsi->mode_flags,
744                                      dsi->lanes, dsi->format, &dsi->lane_mbps);
745         if (ret)
746                 DRM_DEBUG_DRIVER("Phy get_lane_mbps() failed\n");
747
748         pm_runtime_get_sync(dsi->dev);
749         dw_mipi_dsi_init(dsi);
750         dw_mipi_dsi_dpi_config(dsi, mode);
751         dw_mipi_dsi_packet_handler_config(dsi);
752         dw_mipi_dsi_video_mode_config(dsi);
753         dw_mipi_dsi_video_packet_config(dsi, mode);
754         dw_mipi_dsi_command_mode_config(dsi);
755         dw_mipi_dsi_line_timer_config(dsi, mode);
756         dw_mipi_dsi_vertical_timing_config(dsi, mode);
757
758         dw_mipi_dsi_dphy_init(dsi);
759         dw_mipi_dsi_dphy_timing_config(dsi);
760         dw_mipi_dsi_dphy_interface_config(dsi);
761
762         dw_mipi_dsi_clear_err(dsi);
763
764         ret = phy_ops->init(priv_data);
765         if (ret)
766                 DRM_DEBUG_DRIVER("Phy init() failed\n");
767
768         dw_mipi_dsi_dphy_enable(dsi);
769
770         dw_mipi_dsi_wait_for_two_frames(mode);
771
772         /* Switch to cmd mode for panel-bridge pre_enable & panel prepare */
773         dw_mipi_dsi_set_mode(dsi, 0);
774 }
775
776 static void dw_mipi_dsi_bridge_enable(struct drm_bridge *bridge)
777 {
778         struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
779
780         /* Switch to video mode for panel-bridge enable & panel enable */
781         dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
782 }
783
784 static enum drm_mode_status
785 dw_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
786                               const struct drm_display_mode *mode)
787 {
788         struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
789         const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
790         enum drm_mode_status mode_status = MODE_OK;
791
792         if (pdata->mode_valid)
793                 mode_status = pdata->mode_valid(pdata->priv_data, mode);
794
795         return mode_status;
796 }
797
798 static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge)
799 {
800         struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
801
802         if (!bridge->encoder) {
803                 DRM_ERROR("Parent encoder object not found\n");
804                 return -ENODEV;
805         }
806
807         /* Set the encoder type as caller does not know it */
808         bridge->encoder->encoder_type = DRM_MODE_ENCODER_DSI;
809
810         /* Attach the panel-bridge to the dsi bridge */
811         return drm_bridge_attach(bridge->encoder, dsi->panel_bridge, bridge);
812 }
813
814 static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
815         .mode_set     = dw_mipi_dsi_bridge_mode_set,
816         .enable       = dw_mipi_dsi_bridge_enable,
817         .post_disable = dw_mipi_dsi_bridge_post_disable,
818         .mode_valid   = dw_mipi_dsi_bridge_mode_valid,
819         .attach       = dw_mipi_dsi_bridge_attach,
820 };
821
822 static struct dw_mipi_dsi *
823 __dw_mipi_dsi_probe(struct platform_device *pdev,
824                     const struct dw_mipi_dsi_plat_data *plat_data)
825 {
826         struct device *dev = &pdev->dev;
827         struct reset_control *apb_rst;
828         struct dw_mipi_dsi *dsi;
829         struct resource *res;
830         int ret;
831
832         dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
833         if (!dsi)
834                 return ERR_PTR(-ENOMEM);
835
836         dsi->dev = dev;
837         dsi->plat_data = plat_data;
838
839         if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps) {
840                 DRM_ERROR("Phy not properly configured\n");
841                 return ERR_PTR(-ENODEV);
842         }
843
844         if (!plat_data->base) {
845                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
846                 if (!res)
847                         return ERR_PTR(-ENODEV);
848
849                 dsi->base = devm_ioremap_resource(dev, res);
850                 if (IS_ERR(dsi->base))
851                         return ERR_PTR(-ENODEV);
852
853         } else {
854                 dsi->base = plat_data->base;
855         }
856
857         dsi->pclk = devm_clk_get(dev, "pclk");
858         if (IS_ERR(dsi->pclk)) {
859                 ret = PTR_ERR(dsi->pclk);
860                 dev_err(dev, "Unable to get pclk: %d\n", ret);
861                 return ERR_PTR(ret);
862         }
863
864         /*
865          * Note that the reset was not defined in the initial device tree, so
866          * we have to be prepared for it not being found.
867          */
868         apb_rst = devm_reset_control_get(dev, "apb");
869         if (IS_ERR(apb_rst)) {
870                 ret = PTR_ERR(apb_rst);
871                 if (ret == -ENOENT) {
872                         apb_rst = NULL;
873                 } else {
874                         dev_err(dev, "Unable to get reset control: %d\n", ret);
875                         return ERR_PTR(ret);
876                 }
877         }
878
879         if (apb_rst) {
880                 ret = clk_prepare_enable(dsi->pclk);
881                 if (ret) {
882                         dev_err(dev, "%s: Failed to enable pclk\n", __func__);
883                         return ERR_PTR(ret);
884                 }
885
886                 reset_control_assert(apb_rst);
887                 usleep_range(10, 20);
888                 reset_control_deassert(apb_rst);
889
890                 clk_disable_unprepare(dsi->pclk);
891         }
892
893         pm_runtime_enable(dev);
894
895         dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
896         dsi->dsi_host.dev = dev;
897         ret = mipi_dsi_host_register(&dsi->dsi_host);
898         if (ret) {
899                 dev_err(dev, "Failed to register MIPI host: %d\n", ret);
900                 return ERR_PTR(ret);
901         }
902
903         dsi->bridge.driver_private = dsi;
904         dsi->bridge.funcs = &dw_mipi_dsi_bridge_funcs;
905 #ifdef CONFIG_OF
906         dsi->bridge.of_node = pdev->dev.of_node;
907 #endif
908
909         dev_set_drvdata(dev, dsi);
910
911         return dsi;
912 }
913
914 static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
915 {
916         pm_runtime_disable(dsi->dev);
917 }
918
919 /*
920  * Probe/remove API, used from platforms based on the DRM bridge API.
921  */
922 int dw_mipi_dsi_probe(struct platform_device *pdev,
923                       const struct dw_mipi_dsi_plat_data *plat_data)
924 {
925         struct dw_mipi_dsi *dsi;
926
927         dsi = __dw_mipi_dsi_probe(pdev, plat_data);
928         if (IS_ERR(dsi))
929                 return PTR_ERR(dsi);
930
931         return 0;
932 }
933 EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
934
935 void dw_mipi_dsi_remove(struct platform_device *pdev)
936 {
937         struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
938
939         mipi_dsi_host_unregister(&dsi->dsi_host);
940
941         __dw_mipi_dsi_remove(dsi);
942 }
943 EXPORT_SYMBOL_GPL(dw_mipi_dsi_remove);
944
945 /*
946  * Bind/unbind API, used from platforms based on the component framework.
947  */
948 int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
949                      const struct dw_mipi_dsi_plat_data *plat_data)
950 {
951         struct dw_mipi_dsi *dsi;
952         int ret;
953
954         dsi = __dw_mipi_dsi_probe(pdev, plat_data);
955         if (IS_ERR(dsi))
956                 return PTR_ERR(dsi);
957
958         ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
959         if (ret) {
960                 dw_mipi_dsi_remove(pdev);
961                 DRM_ERROR("Failed to initialize bridge with drm\n");
962                 return ret;
963         }
964
965         return 0;
966 }
967 EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
968
969 void dw_mipi_dsi_unbind(struct device *dev)
970 {
971         struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
972
973         __dw_mipi_dsi_remove(dsi);
974 }
975 EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
976
977 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
978 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
979 MODULE_DESCRIPTION("DW MIPI DSI host controller driver");
980 MODULE_LICENSE("GPL");
981 MODULE_ALIAS("platform:dw-mipi-dsi");