1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Samsung SoC MIPI DSI Master driver.
4 *
5 * Copyright (c) 2014 Samsung Electronics Co., Ltd
6 *
7 * Contacts: Tomasz Figa <t.figa@samsung.com>
8 */
9
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/component.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/irq.h>
15 #include <linux/of_device.h>
16 #include <linux/of_gpio.h>
17 #include <linux/of_graph.h>
18 #include <linux/phy/phy.h>
19 #include <linux/regulator/consumer.h>
20
21 #include <asm/unaligned.h>
22
23 #include <video/mipi_display.h>
24 #include <video/videomode.h>
25
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_bridge.h>
28 #include <drm/drm_fb_helper.h>
29 #include <drm/drm_mipi_dsi.h>
30 #include <drm/drm_panel.h>
31 #include <drm/drm_print.h>
32 #include <drm/drm_probe_helper.h>
33 #include <drm/drm_simple_kms_helper.h>
34
35 #include "exynos_drm_crtc.h"
36 #include "exynos_drm_drv.h"
37
38 /* returns true iff both arguments logically differs */
39 #define NEQV(a, b) (!(a) ^ !(b))
40
41 /* DSIM_STATUS */
42 #define DSIM_STOP_STATE_DAT(x) (((x) & 0xf) << 0)
43 #define DSIM_STOP_STATE_CLK (1 << 8)
44 #define DSIM_TX_READY_HS_CLK (1 << 10)
45 #define DSIM_PLL_STABLE (1 << 31)
46
47 /* DSIM_SWRST */
48 #define DSIM_FUNCRST (1 << 16)
49 #define DSIM_SWRST (1 << 0)
50
51 /* DSIM_TIMEOUT */
52 #define DSIM_LPDR_TIMEOUT(x) ((x) << 0)
53 #define DSIM_BTA_TIMEOUT(x) ((x) << 16)
54
55 /* DSIM_CLKCTRL */
56 #define DSIM_ESC_PRESCALER(x) (((x) & 0xffff) << 0)
57 #define DSIM_ESC_PRESCALER_MASK (0xffff << 0)
58 #define DSIM_LANE_ESC_CLK_EN_CLK (1 << 19)
59 #define DSIM_LANE_ESC_CLK_EN_DATA(x) (((x) & 0xf) << 20)
60 #define DSIM_LANE_ESC_CLK_EN_DATA_MASK (0xf << 20)
61 #define DSIM_BYTE_CLKEN (1 << 24)
62 #define DSIM_BYTE_CLK_SRC(x) (((x) & 0x3) << 25)
63 #define DSIM_BYTE_CLK_SRC_MASK (0x3 << 25)
64 #define DSIM_PLL_BYPASS (1 << 27)
65 #define DSIM_ESC_CLKEN (1 << 28)
66 #define DSIM_TX_REQUEST_HSCLK (1 << 31)
67
68 /* DSIM_CONFIG */
69 #define DSIM_LANE_EN_CLK (1 << 0)
70 #define DSIM_LANE_EN(x) (((x) & 0xf) << 1)
71 #define DSIM_NUM_OF_DATA_LANE(x) (((x) & 0x3) << 5)
72 #define DSIM_SUB_PIX_FORMAT(x) (((x) & 0x7) << 8)
73 #define DSIM_MAIN_PIX_FORMAT_MASK (0x7 << 12)
74 #define DSIM_MAIN_PIX_FORMAT_RGB888 (0x7 << 12)
75 #define DSIM_MAIN_PIX_FORMAT_RGB666 (0x6 << 12)
76 #define DSIM_MAIN_PIX_FORMAT_RGB666_P (0x5 << 12)
77 #define DSIM_MAIN_PIX_FORMAT_RGB565 (0x4 << 12)
78 #define DSIM_SUB_VC (((x) & 0x3) << 16)
79 #define DSIM_MAIN_VC (((x) & 0x3) << 18)
80 #define DSIM_HSA_MODE (1 << 20)
81 #define DSIM_HBP_MODE (1 << 21)
82 #define DSIM_HFP_MODE (1 << 22)
83 #define DSIM_HSE_MODE (1 << 23)
84 #define DSIM_AUTO_MODE (1 << 24)
85 #define DSIM_VIDEO_MODE (1 << 25)
86 #define DSIM_BURST_MODE (1 << 26)
87 #define DSIM_SYNC_INFORM (1 << 27)
88 #define DSIM_EOT_DISABLE (1 << 28)
89 #define DSIM_MFLUSH_VS (1 << 29)
90 /* This flag is valid only for exynos3250/3472/5260/5430 */
91 #define DSIM_CLKLANE_STOP (1 << 30)
92
93 /* DSIM_ESCMODE */
94 #define DSIM_TX_TRIGGER_RST (1 << 4)
95 #define DSIM_TX_LPDT_LP (1 << 6)
96 #define DSIM_CMD_LPDT_LP (1 << 7)
97 #define DSIM_FORCE_BTA (1 << 16)
98 #define DSIM_FORCE_STOP_STATE (1 << 20)
99 #define DSIM_STOP_STATE_CNT(x) (((x) & 0x7ff) << 21)
100 #define DSIM_STOP_STATE_CNT_MASK (0x7ff << 21)
101
102 /* DSIM_MDRESOL */
103 #define DSIM_MAIN_STAND_BY (1 << 31)
104 #define DSIM_MAIN_VRESOL(x, num_bits) (((x) & ((1 << (num_bits)) - 1)) << 16)
105 #define DSIM_MAIN_HRESOL(x, num_bits) (((x) & ((1 << (num_bits)) - 1)) << 0)
106
107 /* DSIM_MVPORCH */
108 #define DSIM_CMD_ALLOW(x) ((x) << 28)
109 #define DSIM_STABLE_VFP(x) ((x) << 16)
110 #define DSIM_MAIN_VBP(x) ((x) << 0)
111 #define DSIM_CMD_ALLOW_MASK (0xf << 28)
112 #define DSIM_STABLE_VFP_MASK (0x7ff << 16)
113 #define DSIM_MAIN_VBP_MASK (0x7ff << 0)
114
115 /* DSIM_MHPORCH */
116 #define DSIM_MAIN_HFP(x) ((x) << 16)
117 #define DSIM_MAIN_HBP(x) ((x) << 0)
118 #define DSIM_MAIN_HFP_MASK ((0xffff) << 16)
119 #define DSIM_MAIN_HBP_MASK ((0xffff) << 0)
120
121 /* DSIM_MSYNC */
122 #define DSIM_MAIN_VSA(x) ((x) << 22)
123 #define DSIM_MAIN_HSA(x) ((x) << 0)
124 #define DSIM_MAIN_VSA_MASK ((0x3ff) << 22)
125 #define DSIM_MAIN_HSA_MASK ((0xffff) << 0)
126
127 /* DSIM_SDRESOL */
128 #define DSIM_SUB_STANDY(x) ((x) << 31)
129 #define DSIM_SUB_VRESOL(x) ((x) << 16)
130 #define DSIM_SUB_HRESOL(x) ((x) << 0)
131 #define DSIM_SUB_STANDY_MASK ((0x1) << 31)
132 #define DSIM_SUB_VRESOL_MASK ((0x7ff) << 16)
133 #define DSIM_SUB_HRESOL_MASK ((0x7ff) << 0)
134
135 /* DSIM_INTSRC */
136 #define DSIM_INT_PLL_STABLE (1 << 31)
137 #define DSIM_INT_SW_RST_RELEASE (1 << 30)
138 #define DSIM_INT_SFR_FIFO_EMPTY (1 << 29)
139 #define DSIM_INT_SFR_HDR_FIFO_EMPTY (1 << 28)
140 #define DSIM_INT_BTA (1 << 25)
141 #define DSIM_INT_FRAME_DONE (1 << 24)
142 #define DSIM_INT_RX_TIMEOUT (1 << 21)
143 #define DSIM_INT_BTA_TIMEOUT (1 << 20)
144 #define DSIM_INT_RX_DONE (1 << 18)
145 #define DSIM_INT_RX_TE (1 << 17)
146 #define DSIM_INT_RX_ACK (1 << 16)
147 #define DSIM_INT_RX_ECC_ERR (1 << 15)
148 #define DSIM_INT_RX_CRC_ERR (1 << 14)
149
150 /* DSIM_FIFOCTRL */
151 #define DSIM_RX_DATA_FULL (1 << 25)
152 #define DSIM_RX_DATA_EMPTY (1 << 24)
153 #define DSIM_SFR_HEADER_FULL (1 << 23)
154 #define DSIM_SFR_HEADER_EMPTY (1 << 22)
155 #define DSIM_SFR_PAYLOAD_FULL (1 << 21)
156 #define DSIM_SFR_PAYLOAD_EMPTY (1 << 20)
157 #define DSIM_I80_HEADER_FULL (1 << 19)
158 #define DSIM_I80_HEADER_EMPTY (1 << 18)
159 #define DSIM_I80_PAYLOAD_FULL (1 << 17)
160 #define DSIM_I80_PAYLOAD_EMPTY (1 << 16)
161 #define DSIM_SD_HEADER_FULL (1 << 15)
162 #define DSIM_SD_HEADER_EMPTY (1 << 14)
163 #define DSIM_SD_PAYLOAD_FULL (1 << 13)
164 #define DSIM_SD_PAYLOAD_EMPTY (1 << 12)
165 #define DSIM_MD_HEADER_FULL (1 << 11)
166 #define DSIM_MD_HEADER_EMPTY (1 << 10)
167 #define DSIM_MD_PAYLOAD_FULL (1 << 9)
168 #define DSIM_MD_PAYLOAD_EMPTY (1 << 8)
169 #define DSIM_RX_FIFO (1 << 4)
170 #define DSIM_SFR_FIFO (1 << 3)
171 #define DSIM_I80_FIFO (1 << 2)
172 #define DSIM_SD_FIFO (1 << 1)
173 #define DSIM_MD_FIFO (1 << 0)
174
175 /* DSIM_PHYACCHR */
176 #define DSIM_AFC_EN (1 << 14)
177 #define DSIM_AFC_CTL(x) (((x) & 0x7) << 5)
178
179 /* DSIM_PLLCTRL */
180 #define DSIM_FREQ_BAND(x) ((x) << 24)
181 #define DSIM_PLL_EN (1 << 23)
182 #define DSIM_PLL_P(x) ((x) << 13)
183 #define DSIM_PLL_M(x) ((x) << 4)
184 #define DSIM_PLL_S(x) ((x) << 1)
185
186 /* DSIM_PHYCTRL */
187 #define DSIM_PHYCTRL_ULPS_EXIT(x) (((x) & 0x1ff) << 0)
188 #define DSIM_PHYCTRL_B_DPHYCTL_VREG_LP (1 << 30)
189 #define DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP (1 << 14)
190
191 /* DSIM_PHYTIMING */
192 #define DSIM_PHYTIMING_LPX(x) ((x) << 8)
193 #define DSIM_PHYTIMING_HS_EXIT(x) ((x) << 0)
194
195 /* DSIM_PHYTIMING1 */
196 #define DSIM_PHYTIMING1_CLK_PREPARE(x) ((x) << 24)
197 #define DSIM_PHYTIMING1_CLK_ZERO(x) ((x) << 16)
198 #define DSIM_PHYTIMING1_CLK_POST(x) ((x) << 8)
199 #define DSIM_PHYTIMING1_CLK_TRAIL(x) ((x) << 0)
200
201 /* DSIM_PHYTIMING2 */
202 #define DSIM_PHYTIMING2_HS_PREPARE(x) ((x) << 16)
203 #define DSIM_PHYTIMING2_HS_ZERO(x) ((x) << 8)
204 #define DSIM_PHYTIMING2_HS_TRAIL(x) ((x) << 0)
205
206 #define DSI_MAX_BUS_WIDTH 4
207 #define DSI_NUM_VIRTUAL_CHANNELS 4
208 #define DSI_TX_FIFO_SIZE 2048
209 #define DSI_RX_FIFO_SIZE 256
210 #define DSI_XFER_TIMEOUT_MS 100
211 #define DSI_RX_FIFO_EMPTY 0x30800002
212
213 #define OLD_SCLK_MIPI_CLK_NAME "pll_clk"
214
215 static const char *const clk_names[5] = { "bus_clk", "sclk_mipi",
216 "phyclk_mipidphy0_bitclkdiv8", "phyclk_mipidphy0_rxclkesc0",
217 "sclk_rgb_vclk_to_dsim0" };
218
219 enum exynos_dsi_transfer_type {
220 EXYNOS_DSI_TX,
221 EXYNOS_DSI_RX,
222 };
223
224 struct exynos_dsi_transfer {
225 struct list_head list;
226 struct completion completed;
227 int result;
228 struct mipi_dsi_packet packet;
229 u16 flags;
230 u16 tx_done;
231
232 u8 *rx_payload;
233 u16 rx_len;
234 u16 rx_done;
235 };
236
237 #define DSIM_STATE_ENABLED BIT(0)
238 #define DSIM_STATE_INITIALIZED BIT(1)
239 #define DSIM_STATE_CMD_LPM BIT(2)
240 #define DSIM_STATE_VIDOUT_AVAILABLE BIT(3)
241
242 struct exynos_dsi_driver_data {
243 const unsigned int *reg_ofs;
244 unsigned int plltmr_reg;
245 unsigned int has_freqband:1;
246 unsigned int has_clklane_stop:1;
247 unsigned int num_clks;
248 unsigned int max_freq;
249 unsigned int wait_for_reset;
250 unsigned int num_bits_resol;
251 const unsigned int *reg_values;
252 };
253
254 struct exynos_dsi {
255 struct drm_encoder encoder;
256 struct mipi_dsi_host dsi_host;
257 struct drm_connector connector;
258 struct drm_panel *panel;
259 struct list_head bridge_chain;
260 struct drm_bridge *out_bridge;
261 struct device *dev;
262
263 void __iomem *reg_base;
264 struct phy *phy;
265 struct clk **clks;
266 struct regulator_bulk_data supplies[2];
267 int irq;
268 int te_gpio;
269
270 u32 pll_clk_rate;
271 u32 burst_clk_rate;
272 u32 esc_clk_rate;
273 u32 lanes;
274 u32 mode_flags;
275 u32 format;
276
277 int state;
278 struct drm_property *brightness;
279 struct completion completed;
280
281 spinlock_t transfer_lock; /* protects transfer_list */
282 struct list_head transfer_list;
283
284 const struct exynos_dsi_driver_data *driver_data;
285 };
286
287 #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
288 #define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)
289
encoder_to_dsi(struct drm_encoder * e)290 static inline struct exynos_dsi *encoder_to_dsi(struct drm_encoder *e)
291 {
292 return container_of(e, struct exynos_dsi, encoder);
293 }
294
295 enum reg_idx {
296 DSIM_STATUS_REG, /* Status register */
297 DSIM_SWRST_REG, /* Software reset register */
298 DSIM_CLKCTRL_REG, /* Clock control register */
299 DSIM_TIMEOUT_REG, /* Time out register */
300 DSIM_CONFIG_REG, /* Configuration register */
301 DSIM_ESCMODE_REG, /* Escape mode register */
302 DSIM_MDRESOL_REG,
303 DSIM_MVPORCH_REG, /* Main display Vporch register */
304 DSIM_MHPORCH_REG, /* Main display Hporch register */
305 DSIM_MSYNC_REG, /* Main display sync area register */
306 DSIM_INTSRC_REG, /* Interrupt source register */
307 DSIM_INTMSK_REG, /* Interrupt mask register */
308 DSIM_PKTHDR_REG, /* Packet Header FIFO register */
309 DSIM_PAYLOAD_REG, /* Payload FIFO register */
310 DSIM_RXFIFO_REG, /* Read FIFO register */
311 DSIM_FIFOCTRL_REG, /* FIFO status and control register */
312 DSIM_PLLCTRL_REG, /* PLL control register */
313 DSIM_PHYCTRL_REG,
314 DSIM_PHYTIMING_REG,
315 DSIM_PHYTIMING1_REG,
316 DSIM_PHYTIMING2_REG,
317 NUM_REGS
318 };
319
exynos_dsi_write(struct exynos_dsi * dsi,enum reg_idx idx,u32 val)320 static inline void exynos_dsi_write(struct exynos_dsi *dsi, enum reg_idx idx,
321 u32 val)
322 {
323
324 writel(val, dsi->reg_base + dsi->driver_data->reg_ofs[idx]);
325 }
326
exynos_dsi_read(struct exynos_dsi * dsi,enum reg_idx idx)327 static inline u32 exynos_dsi_read(struct exynos_dsi *dsi, enum reg_idx idx)
328 {
329 return readl(dsi->reg_base + dsi->driver_data->reg_ofs[idx]);
330 }
331
332 static const unsigned int exynos_reg_ofs[] = {
333 [DSIM_STATUS_REG] = 0x00,
334 [DSIM_SWRST_REG] = 0x04,
335 [DSIM_CLKCTRL_REG] = 0x08,
336 [DSIM_TIMEOUT_REG] = 0x0c,
337 [DSIM_CONFIG_REG] = 0x10,
338 [DSIM_ESCMODE_REG] = 0x14,
339 [DSIM_MDRESOL_REG] = 0x18,
340 [DSIM_MVPORCH_REG] = 0x1c,
341 [DSIM_MHPORCH_REG] = 0x20,
342 [DSIM_MSYNC_REG] = 0x24,
343 [DSIM_INTSRC_REG] = 0x2c,
344 [DSIM_INTMSK_REG] = 0x30,
345 [DSIM_PKTHDR_REG] = 0x34,
346 [DSIM_PAYLOAD_REG] = 0x38,
347 [DSIM_RXFIFO_REG] = 0x3c,
348 [DSIM_FIFOCTRL_REG] = 0x44,
349 [DSIM_PLLCTRL_REG] = 0x4c,
350 [DSIM_PHYCTRL_REG] = 0x5c,
351 [DSIM_PHYTIMING_REG] = 0x64,
352 [DSIM_PHYTIMING1_REG] = 0x68,
353 [DSIM_PHYTIMING2_REG] = 0x6c,
354 };
355
356 static const unsigned int exynos5433_reg_ofs[] = {
357 [DSIM_STATUS_REG] = 0x04,
358 [DSIM_SWRST_REG] = 0x0C,
359 [DSIM_CLKCTRL_REG] = 0x10,
360 [DSIM_TIMEOUT_REG] = 0x14,
361 [DSIM_CONFIG_REG] = 0x18,
362 [DSIM_ESCMODE_REG] = 0x1C,
363 [DSIM_MDRESOL_REG] = 0x20,
364 [DSIM_MVPORCH_REG] = 0x24,
365 [DSIM_MHPORCH_REG] = 0x28,
366 [DSIM_MSYNC_REG] = 0x2C,
367 [DSIM_INTSRC_REG] = 0x34,
368 [DSIM_INTMSK_REG] = 0x38,
369 [DSIM_PKTHDR_REG] = 0x3C,
370 [DSIM_PAYLOAD_REG] = 0x40,
371 [DSIM_RXFIFO_REG] = 0x44,
372 [DSIM_FIFOCTRL_REG] = 0x4C,
373 [DSIM_PLLCTRL_REG] = 0x94,
374 [DSIM_PHYCTRL_REG] = 0xA4,
375 [DSIM_PHYTIMING_REG] = 0xB4,
376 [DSIM_PHYTIMING1_REG] = 0xB8,
377 [DSIM_PHYTIMING2_REG] = 0xBC,
378 };
379
380 enum reg_value_idx {
381 RESET_TYPE,
382 PLL_TIMER,
383 STOP_STATE_CNT,
384 PHYCTRL_ULPS_EXIT,
385 PHYCTRL_VREG_LP,
386 PHYCTRL_SLEW_UP,
387 PHYTIMING_LPX,
388 PHYTIMING_HS_EXIT,
389 PHYTIMING_CLK_PREPARE,
390 PHYTIMING_CLK_ZERO,
391 PHYTIMING_CLK_POST,
392 PHYTIMING_CLK_TRAIL,
393 PHYTIMING_HS_PREPARE,
394 PHYTIMING_HS_ZERO,
395 PHYTIMING_HS_TRAIL
396 };
397
398 static const unsigned int reg_values[] = {
399 [RESET_TYPE] = DSIM_SWRST,
400 [PLL_TIMER] = 500,
401 [STOP_STATE_CNT] = 0xf,
402 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x0af),
403 [PHYCTRL_VREG_LP] = 0,
404 [PHYCTRL_SLEW_UP] = 0,
405 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x06),
406 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0b),
407 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x07),
408 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x27),
409 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0d),
410 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x08),
411 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x09),
412 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x0d),
413 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0b),
414 };
415
416 static const unsigned int exynos5422_reg_values[] = {
417 [RESET_TYPE] = DSIM_SWRST,
418 [PLL_TIMER] = 500,
419 [STOP_STATE_CNT] = 0xf,
420 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0xaf),
421 [PHYCTRL_VREG_LP] = 0,
422 [PHYCTRL_SLEW_UP] = 0,
423 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x08),
424 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0d),
425 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09),
426 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x30),
427 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e),
428 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x0a),
429 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0c),
430 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x11),
431 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0d),
432 };
433
434 static const unsigned int exynos5433_reg_values[] = {
435 [RESET_TYPE] = DSIM_FUNCRST,
436 [PLL_TIMER] = 22200,
437 [STOP_STATE_CNT] = 0xa,
438 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x190),
439 [PHYCTRL_VREG_LP] = DSIM_PHYCTRL_B_DPHYCTL_VREG_LP,
440 [PHYCTRL_SLEW_UP] = DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP,
441 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x07),
442 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0c),
443 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09),
444 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x2d),
445 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e),
446 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x09),
447 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0b),
448 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x10),
449 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0c),
450 };
451
452 static const struct exynos_dsi_driver_data exynos3_dsi_driver_data = {
453 .reg_ofs = exynos_reg_ofs,
454 .plltmr_reg = 0x50,
455 .has_freqband = 1,
456 .has_clklane_stop = 1,
457 .num_clks = 2,
458 .max_freq = 1000,
459 .wait_for_reset = 1,
460 .num_bits_resol = 11,
461 .reg_values = reg_values,
462 };
463
464 static const struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
465 .reg_ofs = exynos_reg_ofs,
466 .plltmr_reg = 0x50,
467 .has_freqband = 1,
468 .has_clklane_stop = 1,
469 .num_clks = 2,
470 .max_freq = 1000,
471 .wait_for_reset = 1,
472 .num_bits_resol = 11,
473 .reg_values = reg_values,
474 };
475
476 static const struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
477 .reg_ofs = exynos_reg_ofs,
478 .plltmr_reg = 0x58,
479 .num_clks = 2,
480 .max_freq = 1000,
481 .wait_for_reset = 1,
482 .num_bits_resol = 11,
483 .reg_values = reg_values,
484 };
485
486 static const struct exynos_dsi_driver_data exynos5433_dsi_driver_data = {
487 .reg_ofs = exynos5433_reg_ofs,
488 .plltmr_reg = 0xa0,
489 .has_clklane_stop = 1,
490 .num_clks = 5,
491 .max_freq = 1500,
492 .wait_for_reset = 0,
493 .num_bits_resol = 12,
494 .reg_values = exynos5433_reg_values,
495 };
496
497 static const struct exynos_dsi_driver_data exynos5422_dsi_driver_data = {
498 .reg_ofs = exynos5433_reg_ofs,
499 .plltmr_reg = 0xa0,
500 .has_clklane_stop = 1,
501 .num_clks = 2,
502 .max_freq = 1500,
503 .wait_for_reset = 1,
504 .num_bits_resol = 12,
505 .reg_values = exynos5422_reg_values,
506 };
507
508 static const struct of_device_id exynos_dsi_of_match[] = {
509 { .compatible = "samsung,exynos3250-mipi-dsi",
510 .data = &exynos3_dsi_driver_data },
511 { .compatible = "samsung,exynos4210-mipi-dsi",
512 .data = &exynos4_dsi_driver_data },
513 { .compatible = "samsung,exynos5410-mipi-dsi",
514 .data = &exynos5_dsi_driver_data },
515 { .compatible = "samsung,exynos5422-mipi-dsi",
516 .data = &exynos5422_dsi_driver_data },
517 { .compatible = "samsung,exynos5433-mipi-dsi",
518 .data = &exynos5433_dsi_driver_data },
519 { }
520 };
521
exynos_dsi_wait_for_reset(struct exynos_dsi * dsi)522 static void exynos_dsi_wait_for_reset(struct exynos_dsi *dsi)
523 {
524 if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300)))
525 return;
526
527 dev_err(dsi->dev, "timeout waiting for reset\n");
528 }
529
exynos_dsi_reset(struct exynos_dsi * dsi)530 static void exynos_dsi_reset(struct exynos_dsi *dsi)
531 {
532 u32 reset_val = dsi->driver_data->reg_values[RESET_TYPE];
533
534 reinit_completion(&dsi->completed);
535 exynos_dsi_write(dsi, DSIM_SWRST_REG, reset_val);
536 }
537
538 #ifndef MHZ
539 #define MHZ (1000*1000)
540 #endif
541
exynos_dsi_pll_find_pms(struct exynos_dsi * dsi,unsigned long fin,unsigned long fout,u8 * p,u16 * m,u8 * s)542 static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi,
543 unsigned long fin, unsigned long fout, u8 *p, u16 *m, u8 *s)
544 {
545 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
546 unsigned long best_freq = 0;
547 u32 min_delta = 0xffffffff;
548 u8 p_min, p_max;
549 u8 _p, best_p;
550 u16 _m, best_m;
551 u8 _s, best_s;
552
553 p_min = DIV_ROUND_UP(fin, (12 * MHZ));
554 p_max = fin / (6 * MHZ);
555
556 for (_p = p_min; _p <= p_max; ++_p) {
557 for (_s = 0; _s <= 5; ++_s) {
558 u64 tmp;
559 u32 delta;
560
561 tmp = (u64)fout * (_p << _s);
562 do_div(tmp, fin);
563 _m = tmp;
564 if (_m < 41 || _m > 125)
565 continue;
566
567 tmp = (u64)_m * fin;
568 do_div(tmp, _p);
569 if (tmp < 500 * MHZ ||
570 tmp > driver_data->max_freq * MHZ)
571 continue;
572
573 tmp = (u64)_m * fin;
574 do_div(tmp, _p << _s);
575
576 delta = abs(fout - tmp);
577 if (delta < min_delta) {
578 best_p = _p;
579 best_m = _m;
580 best_s = _s;
581 min_delta = delta;
582 best_freq = tmp;
583 }
584 }
585 }
586
587 if (best_freq) {
588 *p = best_p;
589 *m = best_m;
590 *s = best_s;
591 }
592
593 return best_freq;
594 }
595
exynos_dsi_set_pll(struct exynos_dsi * dsi,unsigned long freq)596 static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
597 unsigned long freq)
598 {
599 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
600 unsigned long fin, fout;
601 int timeout;
602 u8 p, s;
603 u16 m;
604 u32 reg;
605
606 fin = dsi->pll_clk_rate;
607 fout = exynos_dsi_pll_find_pms(dsi, fin, freq, &p, &m, &s);
608 if (!fout) {
609 dev_err(dsi->dev,
610 "failed to find PLL PMS for requested frequency\n");
611 return 0;
612 }
613 dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d)\n", fout, p, m, s);
614
615 writel(driver_data->reg_values[PLL_TIMER],
616 dsi->reg_base + driver_data->plltmr_reg);
617
618 reg = DSIM_PLL_EN | DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);
619
620 if (driver_data->has_freqband) {
621 static const unsigned long freq_bands[] = {
622 100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
623 270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
624 510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
625 770 * MHZ, 870 * MHZ, 950 * MHZ,
626 };
627 int band;
628
629 for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
630 if (fout < freq_bands[band])
631 break;
632
633 dev_dbg(dsi->dev, "band %d\n", band);
634
635 reg |= DSIM_FREQ_BAND(band);
636 }
637
638 exynos_dsi_write(dsi, DSIM_PLLCTRL_REG, reg);
639
640 timeout = 1000;
641 do {
642 if (timeout-- == 0) {
643 dev_err(dsi->dev, "PLL failed to stabilize\n");
644 return 0;
645 }
646 reg = exynos_dsi_read(dsi, DSIM_STATUS_REG);
647 } while ((reg & DSIM_PLL_STABLE) == 0);
648
649 return fout;
650 }
651
exynos_dsi_enable_clock(struct exynos_dsi * dsi)652 static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
653 {
654 unsigned long hs_clk, byte_clk, esc_clk;
655 unsigned long esc_div;
656 u32 reg;
657
658 hs_clk = exynos_dsi_set_pll(dsi, dsi->burst_clk_rate);
659 if (!hs_clk) {
660 dev_err(dsi->dev, "failed to configure DSI PLL\n");
661 return -EFAULT;
662 }
663
664 byte_clk = hs_clk / 8;
665 esc_div = DIV_ROUND_UP(byte_clk, dsi->esc_clk_rate);
666 esc_clk = byte_clk / esc_div;
667
668 if (esc_clk > 20 * MHZ) {
669 ++esc_div;
670 esc_clk = byte_clk / esc_div;
671 }
672
673 dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n",
674 hs_clk, byte_clk, esc_clk);
675
676 reg = exynos_dsi_read(dsi, DSIM_CLKCTRL_REG);
677 reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK
678 | DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS
679 | DSIM_BYTE_CLK_SRC_MASK);
680 reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN
681 | DSIM_ESC_PRESCALER(esc_div)
682 | DSIM_LANE_ESC_CLK_EN_CLK
683 | DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1)
684 | DSIM_BYTE_CLK_SRC(0)
685 | DSIM_TX_REQUEST_HSCLK;
686 exynos_dsi_write(dsi, DSIM_CLKCTRL_REG, reg);
687
688 return 0;
689 }
690
exynos_dsi_set_phy_ctrl(struct exynos_dsi * dsi)691 static void exynos_dsi_set_phy_ctrl(struct exynos_dsi *dsi)
692 {
693 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
694 const unsigned int *reg_values = driver_data->reg_values;
695 u32 reg;
696
697 if (driver_data->has_freqband)
698 return;
699
700 /* B D-PHY: D-PHY Master & Slave Analog Block control */
701 reg = reg_values[PHYCTRL_ULPS_EXIT] | reg_values[PHYCTRL_VREG_LP] |
702 reg_values[PHYCTRL_SLEW_UP];
703 exynos_dsi_write(dsi, DSIM_PHYCTRL_REG, reg);
704
705 /*
706 * T LPX: Transmitted length of any Low-Power state period
707 * T HS-EXIT: Time that the transmitter drives LP-11 following a HS
708 * burst
709 */
710 reg = reg_values[PHYTIMING_LPX] | reg_values[PHYTIMING_HS_EXIT];
711 exynos_dsi_write(dsi, DSIM_PHYTIMING_REG, reg);
712
713 /*
714 * T CLK-PREPARE: Time that the transmitter drives the Clock Lane LP-00
715 * Line state immediately before the HS-0 Line state starting the
716 * HS transmission
717 * T CLK-ZERO: Time that the transmitter drives the HS-0 state prior to
718 * transmitting the Clock.
719 * T CLK_POST: Time that the transmitter continues to send HS clock
720 * after the last associated Data Lane has transitioned to LP Mode
721 * Interval is defined as the period from the end of T HS-TRAIL to
722 * the beginning of T CLK-TRAIL
723 * T CLK-TRAIL: Time that the transmitter drives the HS-0 state after
724 * the last payload clock bit of a HS transmission burst
725 */
726 reg = reg_values[PHYTIMING_CLK_PREPARE] |
727 reg_values[PHYTIMING_CLK_ZERO] |
728 reg_values[PHYTIMING_CLK_POST] |
729 reg_values[PHYTIMING_CLK_TRAIL];
730
731 exynos_dsi_write(dsi, DSIM_PHYTIMING1_REG, reg);
732
733 /*
734 * T HS-PREPARE: Time that the transmitter drives the Data Lane LP-00
735 * Line state immediately before the HS-0 Line state starting the
736 * HS transmission
737 * T HS-ZERO: Time that the transmitter drives the HS-0 state prior to
738 * transmitting the Sync sequence.
739 * T HS-TRAIL: Time that the transmitter drives the flipped differential
740 * state after last payload data bit of a HS transmission burst
741 */
742 reg = reg_values[PHYTIMING_HS_PREPARE] | reg_values[PHYTIMING_HS_ZERO] |
743 reg_values[PHYTIMING_HS_TRAIL];
744 exynos_dsi_write(dsi, DSIM_PHYTIMING2_REG, reg);
745 }
746
exynos_dsi_disable_clock(struct exynos_dsi * dsi)747 static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
748 {
749 u32 reg;
750
751 reg = exynos_dsi_read(dsi, DSIM_CLKCTRL_REG);
752 reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK
753 | DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN);
754 exynos_dsi_write(dsi, DSIM_CLKCTRL_REG, reg);
755
756 reg = exynos_dsi_read(dsi, DSIM_PLLCTRL_REG);
757 reg &= ~DSIM_PLL_EN;
758 exynos_dsi_write(dsi, DSIM_PLLCTRL_REG, reg);
759 }
760
exynos_dsi_enable_lane(struct exynos_dsi * dsi,u32 lane)761 static void exynos_dsi_enable_lane(struct exynos_dsi *dsi, u32 lane)
762 {
763 u32 reg = exynos_dsi_read(dsi, DSIM_CONFIG_REG);
764 reg |= (DSIM_NUM_OF_DATA_LANE(dsi->lanes - 1) | DSIM_LANE_EN_CLK |
765 DSIM_LANE_EN(lane));
766 exynos_dsi_write(dsi, DSIM_CONFIG_REG, reg);
767 }
768
exynos_dsi_init_link(struct exynos_dsi * dsi)769 static int exynos_dsi_init_link(struct exynos_dsi *dsi)
770 {
771 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
772 int timeout;
773 u32 reg;
774 u32 lanes_mask;
775
776 /* Initialize FIFO pointers */
777 reg = exynos_dsi_read(dsi, DSIM_FIFOCTRL_REG);
778 reg &= ~0x1f;
779 exynos_dsi_write(dsi, DSIM_FIFOCTRL_REG, reg);
780
781 usleep_range(9000, 11000);
782
783 reg |= 0x1f;
784 exynos_dsi_write(dsi, DSIM_FIFOCTRL_REG, reg);
785 usleep_range(9000, 11000);
786
787 /* DSI configuration */
788 reg = 0;
789
790 /*
791 * The first bit of mode_flags specifies display configuration.
792 * If this bit is set[= MIPI_DSI_MODE_VIDEO], dsi will support video
793 * mode, otherwise it will support command mode.
794 */
795 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
796 reg |= DSIM_VIDEO_MODE;
797
798 /*
799 * The user manual describes that following bits are ignored in
800 * command mode.
801 */
802 if (!(dsi->mode_flags & MIPI_DSI_MODE_VSYNC_FLUSH))
803 reg |= DSIM_MFLUSH_VS;
804 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
805 reg |= DSIM_SYNC_INFORM;
806 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
807 reg |= DSIM_BURST_MODE;
808 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_AUTO_VERT)
809 reg |= DSIM_AUTO_MODE;
810 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSE)
811 reg |= DSIM_HSE_MODE;
812 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HFP))
813 reg |= DSIM_HFP_MODE;
814 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HBP))
815 reg |= DSIM_HBP_MODE;
816 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSA))
817 reg |= DSIM_HSA_MODE;
818 }
819
820 if (!(dsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET))
821 reg |= DSIM_EOT_DISABLE;
822
823 switch (dsi->format) {
824 case MIPI_DSI_FMT_RGB888:
825 reg |= DSIM_MAIN_PIX_FORMAT_RGB888;
826 break;
827 case MIPI_DSI_FMT_RGB666:
828 reg |= DSIM_MAIN_PIX_FORMAT_RGB666;
829 break;
830 case MIPI_DSI_FMT_RGB666_PACKED:
831 reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P;
832 break;
833 case MIPI_DSI_FMT_RGB565:
834 reg |= DSIM_MAIN_PIX_FORMAT_RGB565;
835 break;
836 default:
837 dev_err(dsi->dev, "invalid pixel format\n");
838 return -EINVAL;
839 }
840
841 /*
842 * Use non-continuous clock mode if the periparal wants and
843 * host controller supports
844 *
845 * In non-continous clock mode, host controller will turn off
846 * the HS clock between high-speed transmissions to reduce
847 * power consumption.
848 */
849 if (driver_data->has_clklane_stop &&
850 dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
851 reg |= DSIM_CLKLANE_STOP;
852 }
853 exynos_dsi_write(dsi, DSIM_CONFIG_REG, reg);
854
855 lanes_mask = BIT(dsi->lanes) - 1;
856 exynos_dsi_enable_lane(dsi, lanes_mask);
857
858 /* Check clock and data lane state are stop state */
859 timeout = 100;
860 do {
861 if (timeout-- == 0) {
862 dev_err(dsi->dev, "waiting for bus lanes timed out\n");
863 return -EFAULT;
864 }
865
866 reg = exynos_dsi_read(dsi, DSIM_STATUS_REG);
867 if ((reg & DSIM_STOP_STATE_DAT(lanes_mask))
868 != DSIM_STOP_STATE_DAT(lanes_mask))
869 continue;
870 } while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK)));
871
872 reg = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
873 reg &= ~DSIM_STOP_STATE_CNT_MASK;
874 reg |= DSIM_STOP_STATE_CNT(driver_data->reg_values[STOP_STATE_CNT]);
875 exynos_dsi_write(dsi, DSIM_ESCMODE_REG, reg);
876
877 reg = DSIM_BTA_TIMEOUT(0xff) | DSIM_LPDR_TIMEOUT(0xffff);
878 exynos_dsi_write(dsi, DSIM_TIMEOUT_REG, reg);
879
880 return 0;
881 }
882
exynos_dsi_set_display_mode(struct exynos_dsi * dsi)883 static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
884 {
885 struct drm_display_mode *m = &dsi->encoder.crtc->state->adjusted_mode;
886 unsigned int num_bits_resol = dsi->driver_data->num_bits_resol;
887 u32 reg;
888
889 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
890 reg = DSIM_CMD_ALLOW(0xf)
891 | DSIM_STABLE_VFP(m->vsync_start - m->vdisplay)
892 | DSIM_MAIN_VBP(m->vtotal - m->vsync_end);
893 exynos_dsi_write(dsi, DSIM_MVPORCH_REG, reg);
894
895 reg = DSIM_MAIN_HFP(m->hsync_start - m->hdisplay)
896 | DSIM_MAIN_HBP(m->htotal - m->hsync_end);
897 exynos_dsi_write(dsi, DSIM_MHPORCH_REG, reg);
898
899 reg = DSIM_MAIN_VSA(m->vsync_end - m->vsync_start)
900 | DSIM_MAIN_HSA(m->hsync_end - m->hsync_start);
901 exynos_dsi_write(dsi, DSIM_MSYNC_REG, reg);
902 }
903 reg = DSIM_MAIN_HRESOL(m->hdisplay, num_bits_resol) |
904 DSIM_MAIN_VRESOL(m->vdisplay, num_bits_resol);
905
906 exynos_dsi_write(dsi, DSIM_MDRESOL_REG, reg);
907
908 dev_dbg(dsi->dev, "LCD size = %dx%d\n", m->hdisplay, m->vdisplay);
909 }
910
exynos_dsi_set_display_enable(struct exynos_dsi * dsi,bool enable)911 static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable)
912 {
913 u32 reg;
914
915 reg = exynos_dsi_read(dsi, DSIM_MDRESOL_REG);
916 if (enable)
917 reg |= DSIM_MAIN_STAND_BY;
918 else
919 reg &= ~DSIM_MAIN_STAND_BY;
920 exynos_dsi_write(dsi, DSIM_MDRESOL_REG, reg);
921 }
922
exynos_dsi_wait_for_hdr_fifo(struct exynos_dsi * dsi)923 static int exynos_dsi_wait_for_hdr_fifo(struct exynos_dsi *dsi)
924 {
925 int timeout = 2000;
926
927 do {
928 u32 reg = exynos_dsi_read(dsi, DSIM_FIFOCTRL_REG);
929
930 if (!(reg & DSIM_SFR_HEADER_FULL))
931 return 0;
932
933 if (!cond_resched())
934 usleep_range(950, 1050);
935 } while (--timeout);
936
937 return -ETIMEDOUT;
938 }
939
exynos_dsi_set_cmd_lpm(struct exynos_dsi * dsi,bool lpm)940 static void exynos_dsi_set_cmd_lpm(struct exynos_dsi *dsi, bool lpm)
941 {
942 u32 v = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
943
944 if (lpm)
945 v |= DSIM_CMD_LPDT_LP;
946 else
947 v &= ~DSIM_CMD_LPDT_LP;
948
949 exynos_dsi_write(dsi, DSIM_ESCMODE_REG, v);
950 }
951
exynos_dsi_force_bta(struct exynos_dsi * dsi)952 static void exynos_dsi_force_bta(struct exynos_dsi *dsi)
953 {
954 u32 v = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
955 v |= DSIM_FORCE_BTA;
956 exynos_dsi_write(dsi, DSIM_ESCMODE_REG, v);
957 }
958
exynos_dsi_send_to_fifo(struct exynos_dsi * dsi,struct exynos_dsi_transfer * xfer)959 static void exynos_dsi_send_to_fifo(struct exynos_dsi *dsi,
960 struct exynos_dsi_transfer *xfer)
961 {
962 struct device *dev = dsi->dev;
963 struct mipi_dsi_packet *pkt = &xfer->packet;
964 const u8 *payload = pkt->payload + xfer->tx_done;
965 u16 length = pkt->payload_length - xfer->tx_done;
966 bool first = !xfer->tx_done;
967 u32 reg;
968
969 dev_dbg(dev, "< xfer %pK: tx len %u, done %u, rx len %u, done %u\n",
970 xfer, length, xfer->tx_done, xfer->rx_len, xfer->rx_done);
971
972 if (length > DSI_TX_FIFO_SIZE)
973 length = DSI_TX_FIFO_SIZE;
974
975 xfer->tx_done += length;
976
977 /* Send payload */
978 while (length >= 4) {
979 reg = get_unaligned_le32(payload);
980 exynos_dsi_write(dsi, DSIM_PAYLOAD_REG, reg);
981 payload += 4;
982 length -= 4;
983 }
984
985 reg = 0;
986 switch (length) {
987 case 3:
988 reg |= payload[2] << 16;
989 fallthrough;
990 case 2:
991 reg |= payload[1] << 8;
992 fallthrough;
993 case 1:
994 reg |= payload[0];
995 exynos_dsi_write(dsi, DSIM_PAYLOAD_REG, reg);
996 break;
997 }
998
999 /* Send packet header */
1000 if (!first)
1001 return;
1002
1003 reg = get_unaligned_le32(pkt->header);
1004 if (exynos_dsi_wait_for_hdr_fifo(dsi)) {
1005 dev_err(dev, "waiting for header FIFO timed out\n");
1006 return;
1007 }
1008
1009 if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM,
1010 dsi->state & DSIM_STATE_CMD_LPM)) {
1011 exynos_dsi_set_cmd_lpm(dsi, xfer->flags & MIPI_DSI_MSG_USE_LPM);
1012 dsi->state ^= DSIM_STATE_CMD_LPM;
1013 }
1014
1015 exynos_dsi_write(dsi, DSIM_PKTHDR_REG, reg);
1016
1017 if (xfer->flags & MIPI_DSI_MSG_REQ_ACK)
1018 exynos_dsi_force_bta(dsi);
1019 }
1020
exynos_dsi_read_from_fifo(struct exynos_dsi * dsi,struct exynos_dsi_transfer * xfer)1021 static void exynos_dsi_read_from_fifo(struct exynos_dsi *dsi,
1022 struct exynos_dsi_transfer *xfer)
1023 {
1024 u8 *payload = xfer->rx_payload + xfer->rx_done;
1025 bool first = !xfer->rx_done;
1026 struct device *dev = dsi->dev;
1027 u16 length;
1028 u32 reg;
1029
1030 if (first) {
1031 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1032
1033 switch (reg & 0x3f) {
1034 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
1035 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1036 if (xfer->rx_len >= 2) {
1037 payload[1] = reg >> 16;
1038 ++xfer->rx_done;
1039 }
1040 fallthrough;
1041 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
1042 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1043 payload[0] = reg >> 8;
1044 ++xfer->rx_done;
1045 xfer->rx_len = xfer->rx_done;
1046 xfer->result = 0;
1047 goto clear_fifo;
1048 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1049 dev_err(dev, "DSI Error Report: 0x%04x\n",
1050 (reg >> 8) & 0xffff);
1051 xfer->result = 0;
1052 goto clear_fifo;
1053 }
1054
1055 length = (reg >> 8) & 0xffff;
1056 if (length > xfer->rx_len) {
1057 dev_err(dev,
1058 "response too long (%u > %u bytes), stripping\n",
1059 xfer->rx_len, length);
1060 length = xfer->rx_len;
1061 } else if (length < xfer->rx_len)
1062 xfer->rx_len = length;
1063 }
1064
1065 length = xfer->rx_len - xfer->rx_done;
1066 xfer->rx_done += length;
1067
1068 /* Receive payload */
1069 while (length >= 4) {
1070 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1071 payload[0] = (reg >> 0) & 0xff;
1072 payload[1] = (reg >> 8) & 0xff;
1073 payload[2] = (reg >> 16) & 0xff;
1074 payload[3] = (reg >> 24) & 0xff;
1075 payload += 4;
1076 length -= 4;
1077 }
1078
1079 if (length) {
1080 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1081 switch (length) {
1082 case 3:
1083 payload[2] = (reg >> 16) & 0xff;
1084 fallthrough;
1085 case 2:
1086 payload[1] = (reg >> 8) & 0xff;
1087 fallthrough;
1088 case 1:
1089 payload[0] = reg & 0xff;
1090 }
1091 }
1092
1093 if (xfer->rx_done == xfer->rx_len)
1094 xfer->result = 0;
1095
1096 clear_fifo:
1097 length = DSI_RX_FIFO_SIZE / 4;
1098 do {
1099 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1100 if (reg == DSI_RX_FIFO_EMPTY)
1101 break;
1102 } while (--length);
1103 }
1104
exynos_dsi_transfer_start(struct exynos_dsi * dsi)1105 static void exynos_dsi_transfer_start(struct exynos_dsi *dsi)
1106 {
1107 unsigned long flags;
1108 struct exynos_dsi_transfer *xfer;
1109 bool start = false;
1110
1111 again:
1112 spin_lock_irqsave(&dsi->transfer_lock, flags);
1113
1114 if (list_empty(&dsi->transfer_list)) {
1115 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1116 return;
1117 }
1118
1119 xfer = list_first_entry(&dsi->transfer_list,
1120 struct exynos_dsi_transfer, list);
1121
1122 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1123
1124 if (xfer->packet.payload_length &&
1125 xfer->tx_done == xfer->packet.payload_length)
1126 /* waiting for RX */
1127 return;
1128
1129 exynos_dsi_send_to_fifo(dsi, xfer);
1130
1131 if (xfer->packet.payload_length || xfer->rx_len)
1132 return;
1133
1134 xfer->result = 0;
1135 complete(&xfer->completed);
1136
1137 spin_lock_irqsave(&dsi->transfer_lock, flags);
1138
1139 list_del_init(&xfer->list);
1140 start = !list_empty(&dsi->transfer_list);
1141
1142 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1143
1144 if (start)
1145 goto again;
1146 }
1147
exynos_dsi_transfer_finish(struct exynos_dsi * dsi)1148 static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
1149 {
1150 struct exynos_dsi_transfer *xfer;
1151 unsigned long flags;
1152 bool start = true;
1153
1154 spin_lock_irqsave(&dsi->transfer_lock, flags);
1155
1156 if (list_empty(&dsi->transfer_list)) {
1157 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1158 return false;
1159 }
1160
1161 xfer = list_first_entry(&dsi->transfer_list,
1162 struct exynos_dsi_transfer, list);
1163
1164 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1165
1166 dev_dbg(dsi->dev,
1167 "> xfer %pK, tx_len %zu, tx_done %u, rx_len %u, rx_done %u\n",
1168 xfer, xfer->packet.payload_length, xfer->tx_done, xfer->rx_len,
1169 xfer->rx_done);
1170
1171 if (xfer->tx_done != xfer->packet.payload_length)
1172 return true;
1173
1174 if (xfer->rx_done != xfer->rx_len)
1175 exynos_dsi_read_from_fifo(dsi, xfer);
1176
1177 if (xfer->rx_done != xfer->rx_len)
1178 return true;
1179
1180 spin_lock_irqsave(&dsi->transfer_lock, flags);
1181
1182 list_del_init(&xfer->list);
1183 start = !list_empty(&dsi->transfer_list);
1184
1185 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1186
1187 if (!xfer->rx_len)
1188 xfer->result = 0;
1189 complete(&xfer->completed);
1190
1191 return start;
1192 }
1193
exynos_dsi_remove_transfer(struct exynos_dsi * dsi,struct exynos_dsi_transfer * xfer)1194 static void exynos_dsi_remove_transfer(struct exynos_dsi *dsi,
1195 struct exynos_dsi_transfer *xfer)
1196 {
1197 unsigned long flags;
1198 bool start;
1199
1200 spin_lock_irqsave(&dsi->transfer_lock, flags);
1201
1202 if (!list_empty(&dsi->transfer_list) &&
1203 xfer == list_first_entry(&dsi->transfer_list,
1204 struct exynos_dsi_transfer, list)) {
1205 list_del_init(&xfer->list);
1206 start = !list_empty(&dsi->transfer_list);
1207 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1208 if (start)
1209 exynos_dsi_transfer_start(dsi);
1210 return;
1211 }
1212
1213 list_del_init(&xfer->list);
1214
1215 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1216 }
1217
exynos_dsi_transfer(struct exynos_dsi * dsi,struct exynos_dsi_transfer * xfer)1218 static int exynos_dsi_transfer(struct exynos_dsi *dsi,
1219 struct exynos_dsi_transfer *xfer)
1220 {
1221 unsigned long flags;
1222 bool stopped;
1223
1224 xfer->tx_done = 0;
1225 xfer->rx_done = 0;
1226 xfer->result = -ETIMEDOUT;
1227 init_completion(&xfer->completed);
1228
1229 spin_lock_irqsave(&dsi->transfer_lock, flags);
1230
1231 stopped = list_empty(&dsi->transfer_list);
1232 list_add_tail(&xfer->list, &dsi->transfer_list);
1233
1234 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1235
1236 if (stopped)
1237 exynos_dsi_transfer_start(dsi);
1238
1239 wait_for_completion_timeout(&xfer->completed,
1240 msecs_to_jiffies(DSI_XFER_TIMEOUT_MS));
1241 if (xfer->result == -ETIMEDOUT) {
1242 struct mipi_dsi_packet *pkt = &xfer->packet;
1243 exynos_dsi_remove_transfer(dsi, xfer);
1244 dev_err(dsi->dev, "xfer timed out: %*ph %*ph\n", 4, pkt->header,
1245 (int)pkt->payload_length, pkt->payload);
1246 return -ETIMEDOUT;
1247 }
1248
1249 /* Also covers hardware timeout condition */
1250 return xfer->result;
1251 }
1252
exynos_dsi_irq(int irq,void * dev_id)1253 static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
1254 {
1255 struct exynos_dsi *dsi = dev_id;
1256 u32 status;
1257
1258 status = exynos_dsi_read(dsi, DSIM_INTSRC_REG);
1259 if (!status) {
1260 static unsigned long int j;
1261 if (printk_timed_ratelimit(&j, 500))
1262 dev_warn(dsi->dev, "spurious interrupt\n");
1263 return IRQ_HANDLED;
1264 }
1265 exynos_dsi_write(dsi, DSIM_INTSRC_REG, status);
1266
1267 if (status & DSIM_INT_SW_RST_RELEASE) {
1268 u32 mask = ~(DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY |
1269 DSIM_INT_SFR_HDR_FIFO_EMPTY | DSIM_INT_RX_ECC_ERR |
1270 DSIM_INT_SW_RST_RELEASE);
1271 exynos_dsi_write(dsi, DSIM_INTMSK_REG, mask);
1272 complete(&dsi->completed);
1273 return IRQ_HANDLED;
1274 }
1275
1276 if (!(status & (DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY |
1277 DSIM_INT_PLL_STABLE)))
1278 return IRQ_HANDLED;
1279
1280 if (exynos_dsi_transfer_finish(dsi))
1281 exynos_dsi_transfer_start(dsi);
1282
1283 return IRQ_HANDLED;
1284 }
1285
exynos_dsi_te_irq_handler(int irq,void * dev_id)1286 static irqreturn_t exynos_dsi_te_irq_handler(int irq, void *dev_id)
1287 {
1288 struct exynos_dsi *dsi = (struct exynos_dsi *)dev_id;
1289 struct drm_encoder *encoder = &dsi->encoder;
1290
1291 if (dsi->state & DSIM_STATE_VIDOUT_AVAILABLE)
1292 exynos_drm_crtc_te_handler(encoder->crtc);
1293
1294 return IRQ_HANDLED;
1295 }
1296
exynos_dsi_enable_irq(struct exynos_dsi * dsi)1297 static void exynos_dsi_enable_irq(struct exynos_dsi *dsi)
1298 {
1299 enable_irq(dsi->irq);
1300
1301 if (gpio_is_valid(dsi->te_gpio))
1302 enable_irq(gpio_to_irq(dsi->te_gpio));
1303 }
1304
exynos_dsi_disable_irq(struct exynos_dsi * dsi)1305 static void exynos_dsi_disable_irq(struct exynos_dsi *dsi)
1306 {
1307 if (gpio_is_valid(dsi->te_gpio))
1308 disable_irq(gpio_to_irq(dsi->te_gpio));
1309
1310 disable_irq(dsi->irq);
1311 }
1312
exynos_dsi_init(struct exynos_dsi * dsi)1313 static int exynos_dsi_init(struct exynos_dsi *dsi)
1314 {
1315 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1316
1317 exynos_dsi_reset(dsi);
1318 exynos_dsi_enable_irq(dsi);
1319
1320 if (driver_data->reg_values[RESET_TYPE] == DSIM_FUNCRST)
1321 exynos_dsi_enable_lane(dsi, BIT(dsi->lanes) - 1);
1322
1323 exynos_dsi_enable_clock(dsi);
1324 if (driver_data->wait_for_reset)
1325 exynos_dsi_wait_for_reset(dsi);
1326 exynos_dsi_set_phy_ctrl(dsi);
1327 exynos_dsi_init_link(dsi);
1328
1329 return 0;
1330 }
1331
exynos_dsi_register_te_irq(struct exynos_dsi * dsi,struct device * panel)1332 static int exynos_dsi_register_te_irq(struct exynos_dsi *dsi,
1333 struct device *panel)
1334 {
1335 int ret;
1336 int te_gpio_irq;
1337
1338 dsi->te_gpio = of_get_named_gpio(panel->of_node, "te-gpios", 0);
1339 if (dsi->te_gpio == -ENOENT)
1340 return 0;
1341
1342 if (!gpio_is_valid(dsi->te_gpio)) {
1343 ret = dsi->te_gpio;
1344 dev_err(dsi->dev, "cannot get te-gpios, %d\n", ret);
1345 goto out;
1346 }
1347
1348 ret = gpio_request(dsi->te_gpio, "te_gpio");
1349 if (ret) {
1350 dev_err(dsi->dev, "gpio request failed with %d\n", ret);
1351 goto out;
1352 }
1353
1354 te_gpio_irq = gpio_to_irq(dsi->te_gpio);
1355
1356 ret = request_threaded_irq(te_gpio_irq, exynos_dsi_te_irq_handler, NULL,
1357 IRQF_TRIGGER_RISING | IRQF_NO_AUTOEN, "TE", dsi);
1358 if (ret) {
1359 dev_err(dsi->dev, "request interrupt failed with %d\n", ret);
1360 gpio_free(dsi->te_gpio);
1361 goto out;
1362 }
1363
1364 out:
1365 return ret;
1366 }
1367
exynos_dsi_unregister_te_irq(struct exynos_dsi * dsi)1368 static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
1369 {
1370 if (gpio_is_valid(dsi->te_gpio)) {
1371 free_irq(gpio_to_irq(dsi->te_gpio), dsi);
1372 gpio_free(dsi->te_gpio);
1373 dsi->te_gpio = -ENOENT;
1374 }
1375 }
1376
exynos_dsi_enable(struct drm_encoder * encoder)1377 static void exynos_dsi_enable(struct drm_encoder *encoder)
1378 {
1379 struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1380 struct drm_bridge *iter;
1381 int ret;
1382
1383 if (dsi->state & DSIM_STATE_ENABLED)
1384 return;
1385
1386 pm_runtime_get_sync(dsi->dev);
1387 dsi->state |= DSIM_STATE_ENABLED;
1388
1389 if (dsi->panel) {
1390 ret = drm_panel_prepare(dsi->panel);
1391 if (ret < 0)
1392 goto err_put_sync;
1393 } else {
1394 list_for_each_entry_reverse(iter, &dsi->bridge_chain,
1395 chain_node) {
1396 if (iter->funcs->pre_enable)
1397 iter->funcs->pre_enable(iter);
1398 }
1399 }
1400
1401 exynos_dsi_set_display_mode(dsi);
1402 exynos_dsi_set_display_enable(dsi, true);
1403
1404 if (dsi->panel) {
1405 ret = drm_panel_enable(dsi->panel);
1406 if (ret < 0)
1407 goto err_display_disable;
1408 } else {
1409 list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
1410 if (iter->funcs->enable)
1411 iter->funcs->enable(iter);
1412 }
1413 }
1414
1415 dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
1416 return;
1417
1418 err_display_disable:
1419 exynos_dsi_set_display_enable(dsi, false);
1420 drm_panel_unprepare(dsi->panel);
1421
1422 err_put_sync:
1423 dsi->state &= ~DSIM_STATE_ENABLED;
1424 pm_runtime_put(dsi->dev);
1425 }
1426
exynos_dsi_disable(struct drm_encoder * encoder)1427 static void exynos_dsi_disable(struct drm_encoder *encoder)
1428 {
1429 struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1430 struct drm_bridge *iter;
1431
1432 if (!(dsi->state & DSIM_STATE_ENABLED))
1433 return;
1434
1435 dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
1436
1437 drm_panel_disable(dsi->panel);
1438
1439 list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
1440 if (iter->funcs->disable)
1441 iter->funcs->disable(iter);
1442 }
1443
1444 exynos_dsi_set_display_enable(dsi, false);
1445 drm_panel_unprepare(dsi->panel);
1446
1447 list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
1448 if (iter->funcs->post_disable)
1449 iter->funcs->post_disable(iter);
1450 }
1451
1452 dsi->state &= ~DSIM_STATE_ENABLED;
1453 pm_runtime_put_sync(dsi->dev);
1454 }
1455
1456 static enum drm_connector_status
exynos_dsi_detect(struct drm_connector * connector,bool force)1457 exynos_dsi_detect(struct drm_connector *connector, bool force)
1458 {
1459 return connector->status;
1460 }
1461
exynos_dsi_connector_destroy(struct drm_connector * connector)1462 static void exynos_dsi_connector_destroy(struct drm_connector *connector)
1463 {
1464 drm_connector_unregister(connector);
1465 drm_connector_cleanup(connector);
1466 connector->dev = NULL;
1467 }
1468
1469 static const struct drm_connector_funcs exynos_dsi_connector_funcs = {
1470 .detect = exynos_dsi_detect,
1471 .fill_modes = drm_helper_probe_single_connector_modes,
1472 .destroy = exynos_dsi_connector_destroy,
1473 .reset = drm_atomic_helper_connector_reset,
1474 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1475 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1476 };
1477
exynos_dsi_get_modes(struct drm_connector * connector)1478 static int exynos_dsi_get_modes(struct drm_connector *connector)
1479 {
1480 struct exynos_dsi *dsi = connector_to_dsi(connector);
1481
1482 if (dsi->panel)
1483 return drm_panel_get_modes(dsi->panel, connector);
1484
1485 return 0;
1486 }
1487
1488 static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = {
1489 .get_modes = exynos_dsi_get_modes,
1490 };
1491
exynos_dsi_create_connector(struct drm_encoder * encoder)1492 static int exynos_dsi_create_connector(struct drm_encoder *encoder)
1493 {
1494 struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1495 struct drm_connector *connector = &dsi->connector;
1496 struct drm_device *drm = encoder->dev;
1497 int ret;
1498
1499 connector->polled = DRM_CONNECTOR_POLL_HPD;
1500
1501 ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs,
1502 DRM_MODE_CONNECTOR_DSI);
1503 if (ret) {
1504 DRM_DEV_ERROR(dsi->dev,
1505 "Failed to initialize connector with drm\n");
1506 return ret;
1507 }
1508
1509 connector->status = connector_status_disconnected;
1510 drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs);
1511 drm_connector_attach_encoder(connector, encoder);
1512 if (!drm->registered)
1513 return 0;
1514
1515 connector->funcs->reset(connector);
1516 drm_connector_register(connector);
1517 return 0;
1518 }
1519
1520 static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
1521 .enable = exynos_dsi_enable,
1522 .disable = exynos_dsi_disable,
1523 };
1524
1525 MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
1526
exynos_dsi_host_attach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)1527 static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
1528 struct mipi_dsi_device *device)
1529 {
1530 struct exynos_dsi *dsi = host_to_dsi(host);
1531 struct drm_encoder *encoder = &dsi->encoder;
1532 struct drm_device *drm = encoder->dev;
1533 struct drm_bridge *out_bridge;
1534
1535 out_bridge = of_drm_find_bridge(device->dev.of_node);
1536 if (out_bridge) {
1537 drm_bridge_attach(encoder, out_bridge, NULL, 0);
1538 dsi->out_bridge = out_bridge;
1539 list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
1540 } else {
1541 int ret = exynos_dsi_create_connector(encoder);
1542
1543 if (ret) {
1544 DRM_DEV_ERROR(dsi->dev,
1545 "failed to create connector ret = %d\n",
1546 ret);
1547 drm_encoder_cleanup(encoder);
1548 return ret;
1549 }
1550
1551 dsi->panel = of_drm_find_panel(device->dev.of_node);
1552 if (IS_ERR(dsi->panel))
1553 dsi->panel = NULL;
1554 else
1555 dsi->connector.status = connector_status_connected;
1556 }
1557
1558 /*
1559 * This is a temporary solution and should be made by more generic way.
1560 *
1561 * If attached panel device is for command mode one, dsi should register
1562 * TE interrupt handler.
1563 */
1564 if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO)) {
1565 int ret = exynos_dsi_register_te_irq(dsi, &device->dev);
1566 if (ret)
1567 return ret;
1568 }
1569
1570 mutex_lock(&drm->mode_config.mutex);
1571
1572 dsi->lanes = device->lanes;
1573 dsi->format = device->format;
1574 dsi->mode_flags = device->mode_flags;
1575 exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
1576 !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
1577
1578 mutex_unlock(&drm->mode_config.mutex);
1579
1580 if (drm->mode_config.poll_enabled)
1581 drm_kms_helper_hotplug_event(drm);
1582
1583 return 0;
1584 }
1585
exynos_dsi_host_detach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)1586 static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
1587 struct mipi_dsi_device *device)
1588 {
1589 struct exynos_dsi *dsi = host_to_dsi(host);
1590 struct drm_device *drm = dsi->encoder.dev;
1591
1592 if (dsi->panel) {
1593 mutex_lock(&drm->mode_config.mutex);
1594 exynos_dsi_disable(&dsi->encoder);
1595 dsi->panel = NULL;
1596 dsi->connector.status = connector_status_disconnected;
1597 mutex_unlock(&drm->mode_config.mutex);
1598 } else {
1599 if (dsi->out_bridge->funcs->detach)
1600 dsi->out_bridge->funcs->detach(dsi->out_bridge);
1601 dsi->out_bridge = NULL;
1602 INIT_LIST_HEAD(&dsi->bridge_chain);
1603 }
1604
1605 if (drm->mode_config.poll_enabled)
1606 drm_kms_helper_hotplug_event(drm);
1607
1608 exynos_dsi_unregister_te_irq(dsi);
1609
1610 return 0;
1611 }
1612
exynos_dsi_host_transfer(struct mipi_dsi_host * host,const struct mipi_dsi_msg * msg)1613 static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
1614 const struct mipi_dsi_msg *msg)
1615 {
1616 struct exynos_dsi *dsi = host_to_dsi(host);
1617 struct exynos_dsi_transfer xfer;
1618 int ret;
1619
1620 if (!(dsi->state & DSIM_STATE_ENABLED))
1621 return -EINVAL;
1622
1623 if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
1624 ret = exynos_dsi_init(dsi);
1625 if (ret)
1626 return ret;
1627 dsi->state |= DSIM_STATE_INITIALIZED;
1628 }
1629
1630 ret = mipi_dsi_create_packet(&xfer.packet, msg);
1631 if (ret < 0)
1632 return ret;
1633
1634 xfer.rx_len = msg->rx_len;
1635 xfer.rx_payload = msg->rx_buf;
1636 xfer.flags = msg->flags;
1637
1638 ret = exynos_dsi_transfer(dsi, &xfer);
1639 return (ret < 0) ? ret : xfer.rx_done;
1640 }
1641
1642 static const struct mipi_dsi_host_ops exynos_dsi_ops = {
1643 .attach = exynos_dsi_host_attach,
1644 .detach = exynos_dsi_host_detach,
1645 .transfer = exynos_dsi_host_transfer,
1646 };
1647
exynos_dsi_of_read_u32(const struct device_node * np,const char * propname,u32 * out_value)1648 static int exynos_dsi_of_read_u32(const struct device_node *np,
1649 const char *propname, u32 *out_value)
1650 {
1651 int ret = of_property_read_u32(np, propname, out_value);
1652
1653 if (ret < 0)
1654 pr_err("%pOF: failed to get '%s' property\n", np, propname);
1655
1656 return ret;
1657 }
1658
1659 enum {
1660 DSI_PORT_IN,
1661 DSI_PORT_OUT
1662 };
1663
exynos_dsi_parse_dt(struct exynos_dsi * dsi)1664 static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
1665 {
1666 struct device *dev = dsi->dev;
1667 struct device_node *node = dev->of_node;
1668 int ret;
1669
1670 ret = exynos_dsi_of_read_u32(node, "samsung,pll-clock-frequency",
1671 &dsi->pll_clk_rate);
1672 if (ret < 0)
1673 return ret;
1674
1675 ret = exynos_dsi_of_read_u32(node, "samsung,burst-clock-frequency",
1676 &dsi->burst_clk_rate);
1677 if (ret < 0)
1678 return ret;
1679
1680 ret = exynos_dsi_of_read_u32(node, "samsung,esc-clock-frequency",
1681 &dsi->esc_clk_rate);
1682 if (ret < 0)
1683 return ret;
1684
1685 return 0;
1686 }
1687
exynos_dsi_bind(struct device * dev,struct device * master,void * data)1688 static int exynos_dsi_bind(struct device *dev, struct device *master,
1689 void *data)
1690 {
1691 struct exynos_dsi *dsi = dev_get_drvdata(dev);
1692 struct drm_encoder *encoder = &dsi->encoder;
1693 struct drm_device *drm_dev = data;
1694 struct device_node *in_bridge_node;
1695 struct drm_bridge *in_bridge;
1696 int ret;
1697
1698 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
1699
1700 drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
1701
1702 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
1703 if (ret < 0)
1704 return ret;
1705
1706 in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
1707 if (in_bridge_node) {
1708 in_bridge = of_drm_find_bridge(in_bridge_node);
1709 if (in_bridge)
1710 drm_bridge_attach(encoder, in_bridge, NULL, 0);
1711 of_node_put(in_bridge_node);
1712 }
1713
1714 return mipi_dsi_host_register(&dsi->dsi_host);
1715 }
1716
exynos_dsi_unbind(struct device * dev,struct device * master,void * data)1717 static void exynos_dsi_unbind(struct device *dev, struct device *master,
1718 void *data)
1719 {
1720 struct exynos_dsi *dsi = dev_get_drvdata(dev);
1721 struct drm_encoder *encoder = &dsi->encoder;
1722
1723 exynos_dsi_disable(encoder);
1724
1725 mipi_dsi_host_unregister(&dsi->dsi_host);
1726 }
1727
1728 static const struct component_ops exynos_dsi_component_ops = {
1729 .bind = exynos_dsi_bind,
1730 .unbind = exynos_dsi_unbind,
1731 };
1732
exynos_dsi_probe(struct platform_device * pdev)1733 static int exynos_dsi_probe(struct platform_device *pdev)
1734 {
1735 struct device *dev = &pdev->dev;
1736 struct resource *res;
1737 struct exynos_dsi *dsi;
1738 int ret, i;
1739
1740 dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
1741 if (!dsi)
1742 return -ENOMEM;
1743
1744 /* To be checked as invalid one */
1745 dsi->te_gpio = -ENOENT;
1746
1747 init_completion(&dsi->completed);
1748 spin_lock_init(&dsi->transfer_lock);
1749 INIT_LIST_HEAD(&dsi->transfer_list);
1750 INIT_LIST_HEAD(&dsi->bridge_chain);
1751
1752 dsi->dsi_host.ops = &exynos_dsi_ops;
1753 dsi->dsi_host.dev = dev;
1754
1755 dsi->dev = dev;
1756 dsi->driver_data = of_device_get_match_data(dev);
1757
1758 dsi->supplies[0].supply = "vddcore";
1759 dsi->supplies[1].supply = "vddio";
1760 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dsi->supplies),
1761 dsi->supplies);
1762 if (ret)
1763 return dev_err_probe(dev, ret, "failed to get regulators\n");
1764
1765 dsi->clks = devm_kcalloc(dev,
1766 dsi->driver_data->num_clks, sizeof(*dsi->clks),
1767 GFP_KERNEL);
1768 if (!dsi->clks)
1769 return -ENOMEM;
1770
1771 for (i = 0; i < dsi->driver_data->num_clks; i++) {
1772 dsi->clks[i] = devm_clk_get(dev, clk_names[i]);
1773 if (IS_ERR(dsi->clks[i])) {
1774 if (strcmp(clk_names[i], "sclk_mipi") == 0) {
1775 dsi->clks[i] = devm_clk_get(dev,
1776 OLD_SCLK_MIPI_CLK_NAME);
1777 if (!IS_ERR(dsi->clks[i]))
1778 continue;
1779 }
1780
1781 dev_info(dev, "failed to get the clock: %s\n",
1782 clk_names[i]);
1783 return PTR_ERR(dsi->clks[i]);
1784 }
1785 }
1786
1787 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1788 dsi->reg_base = devm_ioremap_resource(dev, res);
1789 if (IS_ERR(dsi->reg_base)) {
1790 dev_err(dev, "failed to remap io region\n");
1791 return PTR_ERR(dsi->reg_base);
1792 }
1793
1794 dsi->phy = devm_phy_get(dev, "dsim");
1795 if (IS_ERR(dsi->phy)) {
1796 dev_info(dev, "failed to get dsim phy\n");
1797 return PTR_ERR(dsi->phy);
1798 }
1799
1800 dsi->irq = platform_get_irq(pdev, 0);
1801 if (dsi->irq < 0)
1802 return dsi->irq;
1803
1804 ret = devm_request_threaded_irq(dev, dsi->irq, NULL,
1805 exynos_dsi_irq,
1806 IRQF_ONESHOT | IRQF_NO_AUTOEN,
1807 dev_name(dev), dsi);
1808 if (ret) {
1809 dev_err(dev, "failed to request dsi irq\n");
1810 return ret;
1811 }
1812
1813 ret = exynos_dsi_parse_dt(dsi);
1814 if (ret)
1815 return ret;
1816
1817 platform_set_drvdata(pdev, dsi);
1818
1819 pm_runtime_enable(dev);
1820
1821 ret = component_add(dev, &exynos_dsi_component_ops);
1822 if (ret)
1823 goto err_disable_runtime;
1824
1825 return 0;
1826
1827 err_disable_runtime:
1828 pm_runtime_disable(dev);
1829
1830 return ret;
1831 }
1832
exynos_dsi_remove(struct platform_device * pdev)1833 static int exynos_dsi_remove(struct platform_device *pdev)
1834 {
1835 pm_runtime_disable(&pdev->dev);
1836
1837 component_del(&pdev->dev, &exynos_dsi_component_ops);
1838
1839 return 0;
1840 }
1841
exynos_dsi_suspend(struct device * dev)1842 static int __maybe_unused exynos_dsi_suspend(struct device *dev)
1843 {
1844 struct exynos_dsi *dsi = dev_get_drvdata(dev);
1845 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1846 int ret, i;
1847
1848 usleep_range(10000, 20000);
1849
1850 if (dsi->state & DSIM_STATE_INITIALIZED) {
1851 dsi->state &= ~DSIM_STATE_INITIALIZED;
1852
1853 exynos_dsi_disable_clock(dsi);
1854
1855 exynos_dsi_disable_irq(dsi);
1856 }
1857
1858 dsi->state &= ~DSIM_STATE_CMD_LPM;
1859
1860 phy_power_off(dsi->phy);
1861
1862 for (i = driver_data->num_clks - 1; i > -1; i--)
1863 clk_disable_unprepare(dsi->clks[i]);
1864
1865 ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1866 if (ret < 0)
1867 dev_err(dsi->dev, "cannot disable regulators %d\n", ret);
1868
1869 return 0;
1870 }
1871
exynos_dsi_resume(struct device * dev)1872 static int __maybe_unused exynos_dsi_resume(struct device *dev)
1873 {
1874 struct exynos_dsi *dsi = dev_get_drvdata(dev);
1875 const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1876 int ret, i;
1877
1878 ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1879 if (ret < 0) {
1880 dev_err(dsi->dev, "cannot enable regulators %d\n", ret);
1881 return ret;
1882 }
1883
1884 for (i = 0; i < driver_data->num_clks; i++) {
1885 ret = clk_prepare_enable(dsi->clks[i]);
1886 if (ret < 0)
1887 goto err_clk;
1888 }
1889
1890 ret = phy_power_on(dsi->phy);
1891 if (ret < 0) {
1892 dev_err(dsi->dev, "cannot enable phy %d\n", ret);
1893 goto err_clk;
1894 }
1895
1896 return 0;
1897
1898 err_clk:
1899 while (--i > -1)
1900 clk_disable_unprepare(dsi->clks[i]);
1901 regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1902
1903 return ret;
1904 }
1905
1906 static const struct dev_pm_ops exynos_dsi_pm_ops = {
1907 SET_RUNTIME_PM_OPS(exynos_dsi_suspend, exynos_dsi_resume, NULL)
1908 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1909 pm_runtime_force_resume)
1910 };
1911
1912 struct platform_driver dsi_driver = {
1913 .probe = exynos_dsi_probe,
1914 .remove = exynos_dsi_remove,
1915 .driver = {
1916 .name = "exynos-dsi",
1917 .owner = THIS_MODULE,
1918 .pm = &exynos_dsi_pm_ops,
1919 .of_match_table = exynos_dsi_of_match,
1920 },
1921 };
1922
1923 MODULE_AUTHOR("Tomasz Figa <t.figa@samsung.com>");
1924 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1925 MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master");
1926 MODULE_LICENSE("GPL v2");
1927