1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Novatek NT35510 panel driver
4 * Copyright (C) 2020 Linus Walleij <linus.walleij@linaro.org>
5 * Based on code by Robert Teather (C) 2012 Samsung
6 *
7 * This display driver (and I refer to the physical component NT35510,
8 * not this Linux kernel software driver) can handle:
9 * 480x864, 480x854, 480x800, 480x720 and 480x640 pixel displays.
10 * It has 480x840x24bit SRAM embedded for storing a frame.
11 * When powered on the display is by default in 480x800 mode.
12 *
13 * The actual panels using this component have different names, but
14 * the code needed to set up and configure the panel will be similar,
15 * so they should all use the NT35510 driver with appropriate configuration
16 * per-panel, e.g. for physical size.
17 *
18 * This driver is for the DSI interface to panels using the NT35510.
19 *
20 * The NT35510 can also use an RGB (DPI) interface combined with an
21 * I2C or SPI interface for setting up the NT35510. If this is needed
22 * this panel driver should be refactored to also support that use
23 * case.
24 */
25#include <linux/backlight.h>
26#include <linux/bitops.h>
27#include <linux/gpio/consumer.h>
28#include <linux/module.h>
29#include <linux/of.h>
30#include <linux/regmap.h>
31#include <linux/regulator/consumer.h>
32
33#include <video/mipi_display.h>
34
35#include <drm/drm_mipi_dsi.h>
36#include <drm/drm_modes.h>
37#include <drm/drm_panel.h>
38
39#define NT35510_CMD_CORRECT_GAMMA BIT(0)
40#define NT35510_CMD_CONTROL_DISPLAY BIT(1)
41
42#define MCS_CMD_MAUCCTR 0xF0 /* Manufacturer command enable */
43#define MCS_CMD_READ_ID1 0xDA
44#define MCS_CMD_READ_ID2 0xDB
45#define MCS_CMD_READ_ID3 0xDC
46#define MCS_CMD_MTP_READ_SETTING 0xF8 /* Uncertain about name */
47#define MCS_CMD_MTP_READ_PARAM 0xFF /* Uncertain about name */
48
49/*
50 * These manufacturer commands are available after we enable manufacturer
51 * command set (MCS) for page 0.
52 */
53#define NT35510_P0_DOPCTR 0xB1
54#define NT35510_P0_SDHDTCTR 0xB6
55#define NT35510_P0_GSEQCTR 0xB7
56#define NT35510_P0_SDEQCTR 0xB8
57#define NT35510_P0_SDVPCTR 0xBA
58#define NT35510_P0_DPFRCTR1 0xBD
59#define NT35510_P0_DPFRCTR2 0xBE
60#define NT35510_P0_DPFRCTR3 0xBF
61#define NT35510_P0_DPMCTR12 0xCC
62
63#define NT35510_P0_DOPCTR_LEN 2
64#define NT35510_P0_GSEQCTR_LEN 2
65#define NT35510_P0_SDEQCTR_LEN 4
66#define NT35510_P0_SDVPCTR_LEN 1
67#define NT35510_P0_DPFRCTR1_LEN 5
68#define NT35510_P0_DPFRCTR2_LEN 5
69#define NT35510_P0_DPFRCTR3_LEN 5
70#define NT35510_P0_DPMCTR12_LEN 3
71
72#define NT35510_DOPCTR_0_RAMKP BIT(7) /* Contents kept in sleep */
73#define NT35510_DOPCTR_0_DSITE BIT(6) /* Enable TE signal */
74#define NT35510_DOPCTR_0_DSIG BIT(5) /* Enable generic read/write */
75#define NT35510_DOPCTR_0_DSIM BIT(4) /* Enable video mode on DSI */
76#define NT35510_DOPCTR_0_EOTP BIT(3) /* Support EoTP */
77#define NT35510_DOPCTR_0_N565 BIT(2) /* RGB or BGR pixel format */
78#define NT35510_DOPCTR_1_TW_PWR_SEL BIT(4) /* TE power selector */
79#define NT35510_DOPCTR_1_CRGB BIT(3) /* RGB or BGR byte order */
80#define NT35510_DOPCTR_1_CTB BIT(2) /* Vertical scanning direction */
81#define NT35510_DOPCTR_1_CRL BIT(1) /* Source driver data shift */
82#define NT35510_P0_SDVPCTR_PRG BIT(2) /* 0 = normal operation, 1 = VGLO */
83#define NT35510_P0_SDVPCTR_AVDD 0 /* source driver output = AVDD */
84#define NT35510_P0_SDVPCTR_OFFCOL 1 /* source driver output = off color */
85#define NT35510_P0_SDVPCTR_AVSS 2 /* source driver output = AVSS */
86#define NT35510_P0_SDVPCTR_HI_Z 3 /* source driver output = High impedance */
87
88/*
89 * These manufacturer commands are available after we enable manufacturer
90 * command set (MCS) for page 1.
91 */
92#define NT35510_P1_SETAVDD 0xB0
93#define NT35510_P1_SETAVEE 0xB1
94#define NT35510_P1_SETVCL 0xB2
95#define NT35510_P1_SETVGH 0xB3
96#define NT35510_P1_SETVRGH 0xB4
97#define NT35510_P1_SETVGL 0xB5
98#define NT35510_P1_BT1CTR 0xB6
99#define NT35510_P1_BT2CTR 0xB7
100#define NT35510_P1_BT3CTR 0xB8
101#define NT35510_P1_BT4CTR 0xB9 /* VGH boosting times/freq */
102#define NT35510_P1_BT5CTR 0xBA
103#define NT35510_P1_PFMCTR 0xBB
104#define NT35510_P1_SETVGP 0xBC
105#define NT35510_P1_SETVGN 0xBD
106#define NT35510_P1_SETVCMOFF 0xBE
107#define NT35510_P1_VGHCTR 0xBF /* VGH output ctrl */
108#define NT35510_P1_SET_GAMMA_RED_POS 0xD1
109#define NT35510_P1_SET_GAMMA_GREEN_POS 0xD2
110#define NT35510_P1_SET_GAMMA_BLUE_POS 0xD3
111#define NT35510_P1_SET_GAMMA_RED_NEG 0xD4
112#define NT35510_P1_SET_GAMMA_GREEN_NEG 0xD5
113#define NT35510_P1_SET_GAMMA_BLUE_NEG 0xD6
114
115/* AVDD and AVEE setting 3 bytes */
116#define NT35510_P1_AVDD_LEN 3
117#define NT35510_P1_AVEE_LEN 3
118#define NT35510_P1_VCL_LEN 3
119#define NT35510_P1_VGH_LEN 3
120#define NT35510_P1_VGL_LEN 3
121#define NT35510_P1_VGP_LEN 3
122#define NT35510_P1_VGN_LEN 3
123#define NT35510_P1_VCMOFF_LEN 2
124/* BT1CTR thru BT5CTR setting 3 bytes */
125#define NT35510_P1_BT1CTR_LEN 3
126#define NT35510_P1_BT2CTR_LEN 3
127#define NT35510_P1_BT3CTR_LEN 3
128#define NT35510_P1_BT4CTR_LEN 3
129#define NT35510_P1_BT5CTR_LEN 3
130/* 52 gamma parameters times two per color: positive and negative */
131#define NT35510_P1_GAMMA_LEN 52
132
133#define NT35510_WRCTRLD_BCTRL BIT(5)
134#define NT35510_WRCTRLD_A BIT(4)
135#define NT35510_WRCTRLD_DD BIT(3)
136#define NT35510_WRCTRLD_BL BIT(2)
137#define NT35510_WRCTRLD_DB BIT(1)
138#define NT35510_WRCTRLD_G BIT(0)
139
140#define NT35510_WRCABC_OFF 0
141#define NT35510_WRCABC_UI_MODE 1
142#define NT35510_WRCABC_STILL_MODE 2
143#define NT35510_WRCABC_MOVING_MODE 3
144
145/**
146 * struct nt35510_config - the display-specific NT35510 configuration
147 *
148 * Some of the settings provide an array of bytes, A, B C which mean:
149 * A = normal / idle off mode
150 * B = idle on mode
151 * C = partial / idle off mode
152 *
153 * Gamma correction arrays are 10bit numbers, two consecutive bytes
154 * makes out one point on the gamma correction curve. The points are
155 * not linearly placed along the X axis, we get points 0, 1, 3, 5
156 * 7, 11, 15, 23, 31, 47, 63, 95, 127, 128, 160, 192, 208, 224, 232,
157 * 240, 244, 248, 250, 252, 254, 255. The voltages tuples form
158 * V0, V1, V3 ... V255, with 0x0000 being the lowest voltage and
159 * 0x03FF being the highest voltage.
160 *
161 * Each value must be strictly higher than the previous value forming
162 * a rising curve like this:
163 *
164 * ^
165 * | V255
166 * | V254
167 * | ....
168 * | V5
169 * | V3
170 * | V1
171 * | V0
172 * +------------------------------------------->
173 *
174 * The details about all settings can be found in the NT35510 Application
175 * Note.
176 */
177struct nt35510_config {
178 /**
179 * @width_mm: physical panel width [mm]
180 */
181 u32 width_mm;
182 /**
183 * @height_mm: physical panel height [mm]
184 */
185 u32 height_mm;
186 /**
187 * @mode: the display mode. This is only relevant outside the panel
188 * in video mode: in command mode this is configuring the internal
189 * timing in the display controller.
190 */
191 const struct drm_display_mode mode;
192 /**
193 * @mode_flags: DSI operation mode related flags
194 */
195 unsigned long mode_flags;
196 /**
197 * @cmds: enable DSI commands
198 */
199 u32 cmds;
200 /**
201 * @avdd: setting for AVDD ranging from 0x00 = 6.5V to 0x14 = 4.5V
202 * in 0.1V steps the default is 0x05 which means 6.0V
203 */
204 u8 avdd[NT35510_P1_AVDD_LEN];
205 /**
206 * @bt1ctr: setting for boost power control for the AVDD step-up
207 * circuit (1)
208 * bits 0..2 in the lower nibble controls PCK, the booster clock
209 * frequency for the step-up circuit:
210 * 0 = Hsync/32
211 * 1 = Hsync/16
212 * 2 = Hsync/8
213 * 3 = Hsync/4
214 * 4 = Hsync/2
215 * 5 = Hsync
216 * 6 = Hsync x 2
217 * 7 = Hsync x 4
218 * bits 4..6 in the upper nibble controls BTP, the boosting
219 * amplification for the step-up circuit:
220 * 0 = Disable
221 * 1 = 1.5 x VDDB
222 * 2 = 1.66 x VDDB
223 * 3 = 2 x VDDB
224 * 4 = 2.5 x VDDB
225 * 5 = 3 x VDDB
226 * The defaults are 4 and 4 yielding 0x44
227 */
228 u8 bt1ctr[NT35510_P1_BT1CTR_LEN];
229 /**
230 * @avee: setting for AVEE ranging from 0x00 = -6.5V to 0x14 = -4.5V
231 * in 0.1V steps the default is 0x05 which means -6.0V
232 */
233 u8 avee[NT35510_P1_AVEE_LEN];
234 /**
235 * @bt2ctr: setting for boost power control for the AVEE step-up
236 * circuit (2)
237 * bits 0..2 in the lower nibble controls NCK, the booster clock
238 * frequency, the values are the same as for PCK in @bt1ctr.
239 * bits 4..5 in the upper nibble controls BTN, the boosting
240 * amplification for the step-up circuit.
241 * 0 = Disable
242 * 1 = -1.5 x VDDB
243 * 2 = -2 x VDDB
244 * 3 = -2.5 x VDDB
245 * 4 = -3 x VDDB
246 * The defaults are 4 and 3 yielding 0x34
247 */
248 u8 bt2ctr[NT35510_P1_BT2CTR_LEN];
249 /**
250 * @vcl: setting for VCL ranging from 0x00 = -2.5V to 0x11 = -4.0V
251 * in 1V steps, the default is 0x00 which means -2.5V
252 */
253 u8 vcl[NT35510_P1_VCL_LEN];
254 /**
255 * @bt3ctr: setting for boost power control for the VCL step-up
256 * circuit (3)
257 * bits 0..2 in the lower nibble controls CLCK, the booster clock
258 * frequency, the values are the same as for PCK in @bt1ctr.
259 * bits 4..5 in the upper nibble controls BTCL, the boosting
260 * amplification for the step-up circuit.
261 * 0 = Disable
262 * 1 = -0.5 x VDDB
263 * 2 = -1 x VDDB
264 * 3 = -2 x VDDB
265 * The defaults are 4 and 2 yielding 0x24
266 */
267 u8 bt3ctr[NT35510_P1_BT3CTR_LEN];
268 /**
269 * @vgh: setting for VGH ranging from 0x00 = 7.0V to 0x0B = 18.0V
270 * in 1V steps, the default is 0x08 which means 15V
271 */
272 u8 vgh[NT35510_P1_VGH_LEN];
273 /**
274 * @bt4ctr: setting for boost power control for the VGH step-up
275 * circuit (4)
276 * bits 0..2 in the lower nibble controls HCK, the booster clock
277 * frequency, the values are the same as for PCK in @bt1ctr.
278 * bits 4..5 in the upper nibble controls BTH, the boosting
279 * amplification for the step-up circuit.
280 * 0 = AVDD + VDDB
281 * 1 = AVDD - AVEE
282 * 2 = AVDD - AVEE + VDDB
283 * 3 = AVDD x 2 - AVEE
284 * The defaults are 4 and 3 yielding 0x34
285 */
286 u8 bt4ctr[NT35510_P1_BT4CTR_LEN];
287 /**
288 * @vgl: setting for VGL ranging from 0x00 = -2V to 0x0f = -15V in
289 * 1V steps, the default is 0x08 which means -10V
290 */
291 u8 vgl[NT35510_P1_VGL_LEN];
292 /**
293 * @bt5ctr: setting for boost power control for the VGL step-up
294 * circuit (5)
295 * bits 0..2 in the lower nibble controls LCK, the booster clock
296 * frequency, the values are the same as for PCK in @bt1ctr.
297 * bits 4..5 in the upper nibble controls BTL, the boosting
298 * amplification for the step-up circuit.
299 * 0 = AVEE + VCL
300 * 1 = AVEE - AVDD
301 * 2 = AVEE + VCL - AVDD
302 * 3 = AVEE x 2 - AVDD
303 * The defaults are 3 and 2 yielding 0x32
304 */
305 u8 bt5ctr[NT35510_P1_BT5CTR_LEN];
306 /**
307 * @vgp: setting for VGP, the positive gamma divider voltages
308 * VGMP the high voltage and VGSP the low voltage.
309 * The first byte contains bit 8 of VGMP and VGSP in bits 4 and 0
310 * The second byte contains bit 0..7 of VGMP
311 * The third byte contains bit 0..7 of VGSP
312 * VGMP 0x00 = 3.0V .. 0x108 = 6.3V in steps of 12.5mV
313 * VGSP 0x00 = 0V .. 0x111 = 3.7V in steps of 12.5mV
314 */
315 u8 vgp[NT35510_P1_VGP_LEN];
316 /**
317 * @vgn: setting for VGN, the negative gamma divider voltages,
318 * same layout of bytes as @vgp.
319 */
320 u8 vgn[NT35510_P1_VGN_LEN];
321 /**
322 * @vcmoff: setting the DC VCOM offset voltage
323 * The first byte contains bit 8 of VCM in bit 0 and VCMOFFSEL in bit 4.
324 * The second byte contains bits 0..7 of VCM.
325 * VCMOFFSEL the common voltage offset mode.
326 * VCMOFFSEL 0x00 = VCOM .. 0x01 Gamma.
327 * The default is 0x00.
328 * VCM the VCOM output voltage (VCMOFFSEL = 0) or the internal register
329 * offset for gamma voltage (VCMOFFSEL = 1).
330 * VCM 0x00 = 0V/0 .. 0x118 = 3.5V/280 in steps of 12.5mV/1step
331 * The default is 0x00 = 0V/0.
332 */
333 u8 vcmoff[NT35510_P1_VCMOFF_LEN];
334 /**
335 * @dopctr: setting optional control for display
336 * ERR bits 0..1 in the first byte is the ERR pin output signal setting.
337 * 0 = Disable, ERR pin output low
338 * 1 = ERR pin output CRC error only
339 * 2 = ERR pin output ECC error only
340 * 3 = ERR pin output CRC and ECC error
341 * The default is 0.
342 * N565 bit 2 in the first byte is the 16-bit/pixel format selection.
343 * 0 = R[4:0] + G[5:3] & G[2:0] + B[4:0]
344 * 1 = G[2:0] + R[4:0] & B[4:0] + G[5:3]
345 * The default is 0.
346 * DIS_EoTP_HS bit 3 in the first byte is "DSI protocol violation" error
347 * reporting.
348 * 0 = reporting when error
349 * 1 = not reporting when error
350 * DSIM bit 4 in the first byte is the video mode data type enable
351 * 0 = Video mode data type disable
352 * 1 = Video mode data type enable
353 * The default is 0.
354 * DSIG bit 5 int the first byte is the generic r/w data type enable
355 * 0 = Generic r/w disable
356 * 1 = Generic r/w enable
357 * The default is 0.
358 * DSITE bit 6 in the first byte is TE line enable
359 * 0 = TE line is disabled
360 * 1 = TE line is enabled
361 * The default is 0.
362 * RAMKP bit 7 in the first byte is the frame memory keep/loss in
363 * sleep-in mode
364 * 0 = contents loss in sleep-in
365 * 1 = contents keep in sleep-in
366 * The default is 0.
367 * CRL bit 1 in the second byte is the source driver data shift
368 * direction selection. This bit is XOR operation with bit RSMX
369 * of 3600h command.
370 * 0 (RMSX = 0) = S1 -> S1440
371 * 0 (RMSX = 1) = S1440 -> S1
372 * 1 (RMSX = 0) = S1440 -> S1
373 * 1 (RMSX = 1) = S1 -> S1440
374 * The default is 0.
375 * CTB bit 2 in the second byte is the vertical scanning direction
376 * selection for gate control signals. This bit is XOR operation
377 * with bit ML of 3600h command.
378 * 0 (ML = 0) = Forward (top -> bottom)
379 * 0 (ML = 1) = Reverse (bottom -> top)
380 * 1 (ML = 0) = Reverse (bottom -> top)
381 * 1 (ML = 1) = Forward (top -> bottom)
382 * The default is 0.
383 * CRGB bit 3 in the second byte is RGB-BGR order selection. This
384 * bit is XOR operation with bit RGB of 3600h command.
385 * 0 (RGB = 0) = RGB/Normal
386 * 0 (RGB = 1) = BGR/RB swap
387 * 1 (RGB = 0) = BGR/RB swap
388 * 1 (RGB = 1) = RGB/Normal
389 * The default is 0.
390 * TE_PWR_SEL bit 4 in the second byte is the TE output voltage
391 * level selection (only valid when DSTB_SEL = 0 or DSTB_SEL = 1,
392 * VSEL = High and VDDI = 1.665~3.3V).
393 * 0 = TE output voltage level is VDDI
394 * 1 = TE output voltage level is VDDA
395 * The default is 0.
396 */
397 u8 dopctr[NT35510_P0_DOPCTR_LEN];
398 /**
399 * @madctl: Memory data access control
400 * RSMY bit 0 is flip vertical. Flips the display image top to down.
401 * RSMX bit 1 is flip horizontal. Flips the display image left to right.
402 * MH bit 2 is the horizontal refresh order.
403 * RGB bit 3 is the RGB-BGR order.
404 * 0 = RGB color sequence
405 * 1 = BGR color sequence
406 * ML bit 4 is the vertical refresh order.
407 * MV bit 5 is the row/column exchange.
408 * MX bit 6 is the column address order.
409 * MY bit 7 is the row address order.
410 */
411 u8 madctl;
412 /**
413 * @sdhdtctr: source output data hold time
414 * 0x00..0x3F = 0..31.5us in steps of 0.5us
415 * The default is 0x05 = 2.5us.
416 */
417 u8 sdhdtctr;
418 /**
419 * @gseqctr: EQ control for gate signals
420 * GFEQ_XX[3:0]: time setting of EQ step for falling edge in steps
421 * of 0.5us.
422 * The default is 0x07 = 3.5us
423 * GREQ_XX[7:4]: time setting of EQ step for rising edge in steps
424 * of 0.5us.
425 * The default is 0x07 = 3.5us
426 */
427 u8 gseqctr[NT35510_P0_GSEQCTR_LEN];
428 /**
429 * @sdeqctr: Source driver control settings, first byte is
430 * 0 for mode 1 and 1 for mode 2. Mode 1 uses two steps and
431 * mode 2 uses three steps meaning EQS3 is not used in mode
432 * 1. Mode 2 is default. The last three parameters are EQS1, EQS2
433 * and EQS3, setting the rise time for each equalizer step:
434 * 0x00 = 0.0 us to 0x0f = 7.5 us in steps of 0.5us. The default
435 * is 0x07 = 3.5 us.
436 */
437 u8 sdeqctr[NT35510_P0_SDEQCTR_LEN];
438 /**
439 * @sdvpctr: power/voltage behaviour during vertical porch time
440 */
441 u8 sdvpctr;
442 /**
443 * @t1: the number of pixel clocks on one scanline, range
444 * 0x100 (258 ticks) .. 0x3FF (1024 ticks) so the value + 1
445 * clock ticks.
446 */
447 u16 t1;
448 /**
449 * @vbp: vertical back porch toward the PANEL note: not toward
450 * the DSI host; these are separate interfaces, in from DSI host
451 * and out to the panel.
452 */
453 u8 vbp;
454 /**
455 * @vfp: vertical front porch toward the PANEL.
456 */
457 u8 vfp;
458 /**
459 * @psel: pixel clock divisor: 0 = 1, 1 = 2, 2 = 4, 3 = 8.
460 */
461 u8 psel;
462 /**
463 * @dpmctr12: Display timing control 12
464 * Byte 1 bit 4 selects LVGL voltage level: 0 = VGLX, 1 = VGL_REG
465 * Byte 1 bit 1 selects gate signal mode: 0 = non-overlap, 1 = overlap
466 * Byte 1 bit 0 selects output signal control R/L swap, 0 = normal
467 * 1 = swap all O->E, L->R
468 * Byte 2 is CLW delay clock for CK O/E and CKB O/E signals:
469 * 0x00 = 0us .. 0xFF = 12.75us in 0.05us steps
470 * Byte 3 is FTI_H0 delay time for STP O/E signals:
471 * 0x00 = 0us .. 0xFF = 12.75us in 0.05us steps
472 */
473 u8 dpmctr12[NT35510_P0_DPMCTR12_LEN];
474 /**
475 * @gamma_corr_pos_r: Red gamma correction parameters, positive
476 */
477 u8 gamma_corr_pos_r[NT35510_P1_GAMMA_LEN];
478 /**
479 * @gamma_corr_pos_g: Green gamma correction parameters, positive
480 */
481 u8 gamma_corr_pos_g[NT35510_P1_GAMMA_LEN];
482 /**
483 * @gamma_corr_pos_b: Blue gamma correction parameters, positive
484 */
485 u8 gamma_corr_pos_b[NT35510_P1_GAMMA_LEN];
486 /**
487 * @gamma_corr_neg_r: Red gamma correction parameters, negative
488 */
489 u8 gamma_corr_neg_r[NT35510_P1_GAMMA_LEN];
490 /**
491 * @gamma_corr_neg_g: Green gamma correction parameters, negative
492 */
493 u8 gamma_corr_neg_g[NT35510_P1_GAMMA_LEN];
494 /**
495 * @gamma_corr_neg_b: Blue gamma correction parameters, negative
496 */
497 u8 gamma_corr_neg_b[NT35510_P1_GAMMA_LEN];
498 /**
499 * @wrdisbv: write display brightness
500 * 0x00 value means the lowest brightness and 0xff value means
501 * the highest brightness.
502 * The default is 0x00.
503 */
504 u8 wrdisbv;
505 /**
506 * @wrctrld: write control display
507 * G bit 0 selects gamma curve: 0 = Manual, 1 = Automatic
508 * DB bit 1 selects display brightness: 0 = Manual, 1 = Automatic
509 * BL bit 2 controls backlight control: 0 = Off, 1 = On
510 * DD bit 3 controls display dimming: 0 = Off, 1 = On
511 * A bit 4 controls LABC block: 0 = Off, 1 = On
512 * BCTRL bit 5 controls brightness block: 0 = Off, 1 = On
513 */
514 u8 wrctrld;
515 /**
516 * @wrcabc: write content adaptive brightness control
517 * There is possible to use 4 different modes for content adaptive
518 * image functionality:
519 * 0: Off
520 * 1: User Interface Image (UI-Mode)
521 * 2: Still Picture Image (Still-Mode)
522 * 3: Moving Picture Image (Moving-Mode)
523 * The default is 0
524 */
525 u8 wrcabc;
526 /**
527 * @wrcabcmb: write CABC minimum brightness
528 * Set the minimum brightness value of the display for CABC
529 * function.
530 * 0x00 value means the lowest brightness for CABC and 0xff
531 * value means the highest brightness for CABC.
532 * The default is 0x00.
533 */
534 u8 wrcabcmb;
535};
536
537/**
538 * struct nt35510 - state container for the NT35510 panel
539 */
540struct nt35510 {
541 /**
542 * @dev: the container device
543 */
544 struct device *dev;
545 /**
546 * @conf: the specific panel configuration, as the NT35510
547 * can be combined with many physical panels, they can have
548 * different physical dimensions and gamma correction etc,
549 * so this is stored in the config.
550 */
551 const struct nt35510_config *conf;
552 /**
553 * @panel: the DRM panel object for the instance
554 */
555 struct drm_panel panel;
556 /**
557 * @supplies: regulators supplying the panel
558 */
559 struct regulator_bulk_data supplies[2];
560 /**
561 * @reset_gpio: the reset line
562 */
563 struct gpio_desc *reset_gpio;
564};
565
566/* Manufacturer command has strictly this byte sequence */
567static const u8 nt35510_mauc_mtp_read_param[] = { 0xAA, 0x55, 0x25, 0x01 };
568static const u8 nt35510_mauc_mtp_read_setting[] = { 0x01, 0x02, 0x00, 0x20,
569 0x33, 0x13, 0x00, 0x40,
570 0x00, 0x00, 0x23, 0x02 };
571static const u8 nt35510_mauc_select_page_0[] = { 0x55, 0xAA, 0x52, 0x08, 0x00 };
572static const u8 nt35510_mauc_select_page_1[] = { 0x55, 0xAA, 0x52, 0x08, 0x01 };
573static const u8 nt35510_vgh_on[] = { 0x01 };
574
575static inline struct nt35510 *panel_to_nt35510(struct drm_panel *panel)
576{
577 return container_of(panel, struct nt35510, panel);
578}
579
580#define NT35510_ROTATE_0_SETTING 0x02
581#define NT35510_ROTATE_180_SETTING 0x00
582
583static int nt35510_send_long(struct nt35510 *nt, struct mipi_dsi_device *dsi,
584 u8 cmd, u8 cmdlen, const u8 *seq)
585{
586 const u8 *seqp = seq;
587 int cmdwritten = 0;
588 int chunk = cmdlen;
589 int ret;
590
591 if (chunk > 15)
592 chunk = 15;
593 ret = mipi_dsi_dcs_write(dsi, cmd, data: seqp, len: chunk);
594 if (ret < 0) {
595 dev_err(nt->dev, "error sending DCS command seq cmd %02x\n", cmd);
596 return ret;
597 }
598 cmdwritten += chunk;
599 seqp += chunk;
600
601 while (cmdwritten < cmdlen) {
602 chunk = cmdlen - cmdwritten;
603 if (chunk > 15)
604 chunk = 15;
605 ret = mipi_dsi_generic_write(dsi, payload: seqp, size: chunk);
606 if (ret < 0) {
607 dev_err(nt->dev, "error sending generic write seq %02x\n", cmd);
608 return ret;
609 }
610 cmdwritten += chunk;
611 seqp += chunk;
612 }
613 dev_dbg(nt->dev, "sent command %02x %02x bytes\n", cmd, cmdlen);
614 return 0;
615}
616
617static int nt35510_read_id(struct nt35510 *nt)
618{
619 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
620 u8 id1, id2, id3;
621 int ret;
622
623 ret = mipi_dsi_dcs_read(dsi, MCS_CMD_READ_ID1, data: &id1, len: 1);
624 if (ret < 0) {
625 dev_err(nt->dev, "could not read MTP ID1\n");
626 return ret;
627 }
628 ret = mipi_dsi_dcs_read(dsi, MCS_CMD_READ_ID2, data: &id2, len: 1);
629 if (ret < 0) {
630 dev_err(nt->dev, "could not read MTP ID2\n");
631 return ret;
632 }
633 ret = mipi_dsi_dcs_read(dsi, MCS_CMD_READ_ID3, data: &id3, len: 1);
634 if (ret < 0) {
635 dev_err(nt->dev, "could not read MTP ID3\n");
636 return ret;
637 }
638
639 /*
640 * Multi-Time Programmable (?) memory contains manufacturer
641 * ID (e.g. Hydis 0x55), driver ID (e.g. NT35510 0xc0) and
642 * version.
643 */
644 dev_info(nt->dev, "MTP ID manufacturer: %02x version: %02x driver: %02x\n", id1, id2, id3);
645
646 return 0;
647}
648
649/**
650 * nt35510_setup_power() - set up power config in page 1
651 * @nt: the display instance to set up
652 */
653static int nt35510_setup_power(struct nt35510 *nt)
654{
655 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
656 int ret;
657
658 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETAVDD,
659 NT35510_P1_AVDD_LEN,
660 seq: nt->conf->avdd);
661 if (ret)
662 return ret;
663 ret = nt35510_send_long(nt, dsi, NT35510_P1_BT1CTR,
664 NT35510_P1_BT1CTR_LEN,
665 seq: nt->conf->bt1ctr);
666 if (ret)
667 return ret;
668 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETAVEE,
669 NT35510_P1_AVEE_LEN,
670 seq: nt->conf->avee);
671 if (ret)
672 return ret;
673 ret = nt35510_send_long(nt, dsi, NT35510_P1_BT2CTR,
674 NT35510_P1_BT2CTR_LEN,
675 seq: nt->conf->bt2ctr);
676 if (ret)
677 return ret;
678 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVCL,
679 NT35510_P1_VCL_LEN,
680 seq: nt->conf->vcl);
681 if (ret)
682 return ret;
683 ret = nt35510_send_long(nt, dsi, NT35510_P1_BT3CTR,
684 NT35510_P1_BT3CTR_LEN,
685 seq: nt->conf->bt3ctr);
686 if (ret)
687 return ret;
688 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVGH,
689 NT35510_P1_VGH_LEN,
690 seq: nt->conf->vgh);
691 if (ret)
692 return ret;
693 ret = nt35510_send_long(nt, dsi, NT35510_P1_BT4CTR,
694 NT35510_P1_BT4CTR_LEN,
695 seq: nt->conf->bt4ctr);
696 if (ret)
697 return ret;
698 ret = nt35510_send_long(nt, dsi, NT35510_P1_VGHCTR,
699 ARRAY_SIZE(nt35510_vgh_on),
700 seq: nt35510_vgh_on);
701 if (ret)
702 return ret;
703 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVGL,
704 NT35510_P1_VGL_LEN,
705 seq: nt->conf->vgl);
706 if (ret)
707 return ret;
708 ret = nt35510_send_long(nt, dsi, NT35510_P1_BT5CTR,
709 NT35510_P1_BT5CTR_LEN,
710 seq: nt->conf->bt5ctr);
711 if (ret)
712 return ret;
713 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVGP,
714 NT35510_P1_VGP_LEN,
715 seq: nt->conf->vgp);
716 if (ret)
717 return ret;
718 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVGN,
719 NT35510_P1_VGN_LEN,
720 seq: nt->conf->vgn);
721 if (ret)
722 return ret;
723
724 ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVCMOFF,
725 NT35510_P1_VCMOFF_LEN,
726 seq: nt->conf->vcmoff);
727 if (ret)
728 return ret;
729
730 /* Typically 10 ms */
731 usleep_range(min: 10000, max: 20000);
732
733 return 0;
734}
735
736/**
737 * nt35510_setup_display() - set up display config in page 0
738 * @nt: the display instance to set up
739 */
740static int nt35510_setup_display(struct nt35510 *nt)
741{
742 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
743 const struct nt35510_config *conf = nt->conf;
744 u8 dpfrctr[NT35510_P0_DPFRCTR1_LEN];
745 int ret;
746
747 ret = nt35510_send_long(nt, dsi, NT35510_P0_DOPCTR,
748 NT35510_P0_DOPCTR_LEN,
749 seq: conf->dopctr);
750 if (ret)
751 return ret;
752
753 ret = mipi_dsi_dcs_write(dsi, cmd: MIPI_DCS_SET_ADDRESS_MODE, data: &conf->madctl,
754 len: sizeof(conf->madctl));
755 if (ret < 0)
756 return ret;
757
758 ret = mipi_dsi_dcs_write(dsi, NT35510_P0_SDHDTCTR, data: &conf->sdhdtctr,
759 len: sizeof(conf->sdhdtctr));
760 if (ret < 0)
761 return ret;
762
763 ret = nt35510_send_long(nt, dsi, NT35510_P0_GSEQCTR,
764 NT35510_P0_GSEQCTR_LEN,
765 seq: conf->gseqctr);
766 if (ret)
767 return ret;
768
769 ret = nt35510_send_long(nt, dsi, NT35510_P0_SDEQCTR,
770 NT35510_P0_SDEQCTR_LEN,
771 seq: conf->sdeqctr);
772 if (ret)
773 return ret;
774
775 ret = mipi_dsi_dcs_write(dsi, NT35510_P0_SDVPCTR,
776 data: &conf->sdvpctr, len: 1);
777 if (ret < 0)
778 return ret;
779
780 /*
781 * Display timing control for active and idle off mode:
782 * the first byte contains
783 * the two high bits of T1A and second byte the low 8 bits, and
784 * the valid range is 0x100 (257) to 0x3ff (1023) representing
785 * 258..1024 (+1) pixel clock ticks for one scanline. At 20MHz pixel
786 * clock this covers the range of 12.90us .. 51.20us in steps of
787 * 0.05us, the default is 0x184 (388) representing 389 ticks.
788 * The third byte is VBPDA, vertical back porch display active
789 * and the fourth VFPDA, vertical front porch display active,
790 * both given in number of scanlines in the range 0x02..0xff
791 * for 2..255 scanlines. The fifth byte is 2 bits selecting
792 * PSEL for active and idle off mode, how much the 20MHz clock
793 * is divided by 0..3. This needs to be adjusted to get the right
794 * frame rate.
795 */
796 dpfrctr[0] = (conf->t1 >> 8) & 0xFF;
797 dpfrctr[1] = conf->t1 & 0xFF;
798 /* Vertical back porch */
799 dpfrctr[2] = conf->vbp;
800 /* Vertical front porch */
801 dpfrctr[3] = conf->vfp;
802 dpfrctr[4] = conf->psel;
803 ret = nt35510_send_long(nt, dsi, NT35510_P0_DPFRCTR1,
804 NT35510_P0_DPFRCTR1_LEN,
805 seq: dpfrctr);
806 if (ret)
807 return ret;
808 /* For idle and partial idle off mode we decrease front porch by one */
809 dpfrctr[3]--;
810 ret = nt35510_send_long(nt, dsi, NT35510_P0_DPFRCTR2,
811 NT35510_P0_DPFRCTR2_LEN,
812 seq: dpfrctr);
813 if (ret)
814 return ret;
815 ret = nt35510_send_long(nt, dsi, NT35510_P0_DPFRCTR3,
816 NT35510_P0_DPFRCTR3_LEN,
817 seq: dpfrctr);
818 if (ret)
819 return ret;
820
821 /* Enable TE on vblank */
822 ret = mipi_dsi_dcs_set_tear_on(dsi, mode: MIPI_DSI_DCS_TEAR_MODE_VBLANK);
823 if (ret)
824 return ret;
825
826 /* Turn on the pads? */
827 ret = nt35510_send_long(nt, dsi, NT35510_P0_DPMCTR12,
828 NT35510_P0_DPMCTR12_LEN,
829 seq: conf->dpmctr12);
830 if (ret)
831 return ret;
832
833 return 0;
834}
835
836static int nt35510_set_brightness(struct backlight_device *bl)
837{
838 struct nt35510 *nt = bl_get_data(bl_dev: bl);
839 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
840 u8 brightness = bl->props.brightness;
841 int ret;
842
843 dev_dbg(nt->dev, "set brightness %d\n", brightness);
844 ret = mipi_dsi_dcs_write(dsi, cmd: MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
845 data: &brightness,
846 len: sizeof(brightness));
847 if (ret < 0)
848 return ret;
849
850 return 0;
851}
852
853static const struct backlight_ops nt35510_bl_ops = {
854 .update_status = nt35510_set_brightness,
855};
856
857/*
858 * This power-on sequence
859 */
860static int nt35510_power_on(struct nt35510 *nt)
861{
862 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
863 int ret;
864
865 ret = regulator_bulk_enable(ARRAY_SIZE(nt->supplies), consumers: nt->supplies);
866 if (ret < 0) {
867 dev_err(nt->dev, "unable to enable regulators\n");
868 return ret;
869 }
870
871 /* Toggle RESET in accordance with datasheet page 370 */
872 if (nt->reset_gpio) {
873 gpiod_set_value(desc: nt->reset_gpio, value: 1);
874 /* Active min 10 us according to datasheet, let's say 20 */
875 usleep_range(min: 20, max: 1000);
876 gpiod_set_value(desc: nt->reset_gpio, value: 0);
877 /*
878 * 5 ms during sleep mode, 120 ms during sleep out mode
879 * according to datasheet, let's use 120-140 ms.
880 */
881 usleep_range(min: 120000, max: 140000);
882 }
883
884 ret = nt35510_send_long(nt, dsi, MCS_CMD_MTP_READ_PARAM,
885 ARRAY_SIZE(nt35510_mauc_mtp_read_param),
886 seq: nt35510_mauc_mtp_read_param);
887 if (ret)
888 return ret;
889
890 ret = nt35510_send_long(nt, dsi, MCS_CMD_MTP_READ_SETTING,
891 ARRAY_SIZE(nt35510_mauc_mtp_read_setting),
892 seq: nt35510_mauc_mtp_read_setting);
893 if (ret)
894 return ret;
895
896 nt35510_read_id(nt);
897
898 /* Set up stuff in manufacturer control, page 1 */
899 ret = nt35510_send_long(nt, dsi, MCS_CMD_MAUCCTR,
900 ARRAY_SIZE(nt35510_mauc_select_page_1),
901 seq: nt35510_mauc_select_page_1);
902 if (ret)
903 return ret;
904
905 ret = nt35510_setup_power(nt);
906 if (ret)
907 return ret;
908
909 if (nt->conf->cmds & NT35510_CMD_CORRECT_GAMMA) {
910 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_RED_POS,
911 NT35510_P1_GAMMA_LEN,
912 seq: nt->conf->gamma_corr_pos_r);
913 if (ret)
914 return ret;
915 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_GREEN_POS,
916 NT35510_P1_GAMMA_LEN,
917 seq: nt->conf->gamma_corr_pos_g);
918 if (ret)
919 return ret;
920 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_BLUE_POS,
921 NT35510_P1_GAMMA_LEN,
922 seq: nt->conf->gamma_corr_pos_b);
923 if (ret)
924 return ret;
925 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_RED_NEG,
926 NT35510_P1_GAMMA_LEN,
927 seq: nt->conf->gamma_corr_neg_r);
928 if (ret)
929 return ret;
930 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_GREEN_NEG,
931 NT35510_P1_GAMMA_LEN,
932 seq: nt->conf->gamma_corr_neg_g);
933 if (ret)
934 return ret;
935 ret = nt35510_send_long(nt, dsi, NT35510_P1_SET_GAMMA_BLUE_NEG,
936 NT35510_P1_GAMMA_LEN,
937 seq: nt->conf->gamma_corr_neg_b);
938 if (ret)
939 return ret;
940 }
941
942 /* Set up stuff in manufacturer control, page 0 */
943 ret = nt35510_send_long(nt, dsi, MCS_CMD_MAUCCTR,
944 ARRAY_SIZE(nt35510_mauc_select_page_0),
945 seq: nt35510_mauc_select_page_0);
946 if (ret)
947 return ret;
948
949 ret = nt35510_setup_display(nt);
950 if (ret)
951 return ret;
952
953 return 0;
954}
955
956static int nt35510_power_off(struct nt35510 *nt)
957{
958 int ret;
959
960 ret = regulator_bulk_disable(ARRAY_SIZE(nt->supplies), consumers: nt->supplies);
961 if (ret)
962 return ret;
963
964 if (nt->reset_gpio)
965 gpiod_set_value(desc: nt->reset_gpio, value: 1);
966
967 return 0;
968}
969
970static int nt35510_unprepare(struct drm_panel *panel)
971{
972 struct nt35510 *nt = panel_to_nt35510(panel);
973 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
974 int ret;
975
976 ret = mipi_dsi_dcs_set_display_off(dsi);
977 if (ret) {
978 dev_err(nt->dev, "failed to turn display off (%d)\n", ret);
979 return ret;
980 }
981 usleep_range(min: 10000, max: 20000);
982
983 /* Enter sleep mode */
984 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
985 if (ret) {
986 dev_err(nt->dev, "failed to enter sleep mode (%d)\n", ret);
987 return ret;
988 }
989
990 /* Wait 4 frames, how much is that 5ms in the vendor driver */
991 usleep_range(min: 5000, max: 10000);
992
993 ret = nt35510_power_off(nt);
994 if (ret)
995 return ret;
996
997 return 0;
998}
999
1000static int nt35510_prepare(struct drm_panel *panel)
1001{
1002 struct nt35510 *nt = panel_to_nt35510(panel);
1003 struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
1004 int ret;
1005
1006 ret = nt35510_power_on(nt);
1007 if (ret)
1008 return ret;
1009
1010 /* Exit sleep mode */
1011 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
1012 if (ret) {
1013 dev_err(nt->dev, "failed to exit sleep mode (%d)\n", ret);
1014 return ret;
1015 }
1016 /* Up to 120 ms */
1017 usleep_range(min: 120000, max: 150000);
1018
1019 if (nt->conf->cmds & NT35510_CMD_CONTROL_DISPLAY) {
1020 ret = mipi_dsi_dcs_write(dsi, cmd: MIPI_DCS_WRITE_CONTROL_DISPLAY,
1021 data: &nt->conf->wrctrld,
1022 len: sizeof(nt->conf->wrctrld));
1023 if (ret < 0)
1024 return ret;
1025
1026 ret = mipi_dsi_dcs_write(dsi, cmd: MIPI_DCS_WRITE_POWER_SAVE,
1027 data: &nt->conf->wrcabc,
1028 len: sizeof(nt->conf->wrcabc));
1029 if (ret < 0)
1030 return ret;
1031
1032 ret = mipi_dsi_dcs_write(dsi, cmd: MIPI_DCS_SET_CABC_MIN_BRIGHTNESS,
1033 data: &nt->conf->wrcabcmb,
1034 len: sizeof(nt->conf->wrcabcmb));
1035 if (ret < 0)
1036 return ret;
1037 }
1038
1039 ret = mipi_dsi_dcs_set_display_on(dsi);
1040 if (ret) {
1041 dev_err(nt->dev, "failed to turn display on (%d)\n", ret);
1042 return ret;
1043 }
1044 /* Some 10 ms */
1045 usleep_range(min: 10000, max: 20000);
1046
1047 return 0;
1048}
1049
1050static int nt35510_get_modes(struct drm_panel *panel,
1051 struct drm_connector *connector)
1052{
1053 struct nt35510 *nt = panel_to_nt35510(panel);
1054 struct drm_display_mode *mode;
1055 struct drm_display_info *info;
1056
1057 info = &connector->display_info;
1058 info->width_mm = nt->conf->width_mm;
1059 info->height_mm = nt->conf->height_mm;
1060 mode = drm_mode_duplicate(dev: connector->dev, mode: &nt->conf->mode);
1061 if (!mode) {
1062 dev_err(panel->dev, "bad mode or failed to add mode\n");
1063 return -EINVAL;
1064 }
1065 drm_mode_set_name(mode);
1066 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
1067
1068 mode->width_mm = nt->conf->width_mm;
1069 mode->height_mm = nt->conf->height_mm;
1070 drm_mode_probed_add(connector, mode);
1071
1072 return 1; /* Number of modes */
1073}
1074
1075static const struct drm_panel_funcs nt35510_drm_funcs = {
1076 .unprepare = nt35510_unprepare,
1077 .prepare = nt35510_prepare,
1078 .get_modes = nt35510_get_modes,
1079};
1080
1081static int nt35510_probe(struct mipi_dsi_device *dsi)
1082{
1083 struct device *dev = &dsi->dev;
1084 struct nt35510 *nt;
1085 int ret;
1086
1087 nt = devm_kzalloc(dev, size: sizeof(struct nt35510), GFP_KERNEL);
1088 if (!nt)
1089 return -ENOMEM;
1090 mipi_dsi_set_drvdata(dsi, data: nt);
1091 nt->dev = dev;
1092
1093 dsi->lanes = 2;
1094 dsi->format = MIPI_DSI_FMT_RGB888;
1095 /*
1096 * Datasheet suggests max HS rate for NT35510 is 250 MHz
1097 * (period time 4ns, see figure 7.6.4 page 365) and max LP rate is
1098 * 20 MHz (period time 50ns, see figure 7.6.6. page 366).
1099 * However these frequencies appear in source code for the Hydis
1100 * HVA40WV1 panel and setting up the LP frequency makes the panel
1101 * not work.
1102 *
1103 * TODO: if other panels prove to be closer to the datasheet,
1104 * maybe make this a per-panel config in struct nt35510_config?
1105 */
1106 dsi->hs_rate = 349440000;
1107 dsi->lp_rate = 9600000;
1108
1109 /*
1110 * Every new incarnation of this display must have a unique
1111 * data entry for the system in this driver.
1112 */
1113 nt->conf = of_device_get_match_data(dev);
1114 if (!nt->conf) {
1115 dev_err(dev, "missing device configuration\n");
1116 return -ENODEV;
1117 }
1118
1119 dsi->mode_flags = nt->conf->mode_flags;
1120
1121 nt->supplies[0].supply = "vdd"; /* 2.3-4.8 V */
1122 nt->supplies[1].supply = "vddi"; /* 1.65-3.3V */
1123 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(nt->supplies),
1124 consumers: nt->supplies);
1125 if (ret < 0)
1126 return ret;
1127 ret = regulator_set_voltage(regulator: nt->supplies[0].consumer,
1128 min_uV: 2300000, max_uV: 4800000);
1129 if (ret)
1130 return ret;
1131 ret = regulator_set_voltage(regulator: nt->supplies[1].consumer,
1132 min_uV: 1650000, max_uV: 3300000);
1133 if (ret)
1134 return ret;
1135
1136 nt->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset", flags: GPIOD_OUT_HIGH);
1137 if (IS_ERR(ptr: nt->reset_gpio)) {
1138 dev_err(dev, "error getting RESET GPIO\n");
1139 return PTR_ERR(ptr: nt->reset_gpio);
1140 }
1141
1142 drm_panel_init(panel: &nt->panel, dev, funcs: &nt35510_drm_funcs,
1143 DRM_MODE_CONNECTOR_DSI);
1144
1145 /*
1146 * First, try to locate an external backlight (such as on GPIO)
1147 * if this fails, assume we will want to use the internal backlight
1148 * control.
1149 */
1150 ret = drm_panel_of_backlight(panel: &nt->panel);
1151 if (ret) {
1152 dev_err(dev, "error getting external backlight %d\n", ret);
1153 return ret;
1154 }
1155 if (!nt->panel.backlight) {
1156 struct backlight_device *bl;
1157
1158 bl = devm_backlight_device_register(dev, name: "nt35510", parent: dev, devdata: nt,
1159 ops: &nt35510_bl_ops, NULL);
1160 if (IS_ERR(ptr: bl)) {
1161 dev_err(dev, "failed to register backlight device\n");
1162 return PTR_ERR(ptr: bl);
1163 }
1164 bl->props.max_brightness = 255;
1165 if (nt->conf->cmds & NT35510_CMD_CONTROL_DISPLAY)
1166 bl->props.brightness = nt->conf->wrdisbv;
1167 else
1168 bl->props.brightness = 255;
1169 bl->props.power = FB_BLANK_POWERDOWN;
1170 nt->panel.backlight = bl;
1171 }
1172
1173 drm_panel_add(panel: &nt->panel);
1174
1175 ret = mipi_dsi_attach(dsi);
1176 if (ret < 0)
1177 drm_panel_remove(panel: &nt->panel);
1178
1179 return 0;
1180}
1181
1182static void nt35510_remove(struct mipi_dsi_device *dsi)
1183{
1184 struct nt35510 *nt = mipi_dsi_get_drvdata(dsi);
1185 int ret;
1186
1187 mipi_dsi_detach(dsi);
1188 /* Power off */
1189 ret = nt35510_power_off(nt);
1190 if (ret)
1191 dev_err(&dsi->dev, "Failed to power off\n");
1192
1193 drm_panel_remove(panel: &nt->panel);
1194}
1195
1196/*
1197 * These gamma correction values are 10bit tuples, so only bits 0 and 1 is
1198 * ever used in the first byte. They form a positive and negative gamma
1199 * correction curve for each color, values must be strictly higher for each
1200 * step on the curve. As can be seen these default curves goes from 0x0001
1201 * to 0x03FE.
1202 */
1203#define NT35510_GAMMA_POS_DEFAULT 0x00, 0x01, 0x00, 0x43, 0x00, \
1204 0x6B, 0x00, 0x87, 0x00, 0xA3, 0x00, 0xCE, 0x00, 0xF1, 0x01, \
1205 0x27, 0x01, 0x53, 0x01, 0x98, 0x01, 0xCE, 0x02, 0x22, 0x02, \
1206 0x83, 0x02, 0x78, 0x02, 0x9E, 0x02, 0xDD, 0x03, 0x00, 0x03, \
1207 0x2E, 0x03, 0x54, 0x03, 0x7F, 0x03, 0x95, 0x03, 0xB3, 0x03, \
1208 0xC2, 0x03, 0xE1, 0x03, 0xF1, 0x03, 0xFE
1209
1210#define NT35510_GAMMA_NEG_DEFAULT 0x00, 0x01, 0x00, 0x43, 0x00, \
1211 0x6B, 0x00, 0x87, 0x00, 0xA3, 0x00, 0xCE, 0x00, 0xF1, 0x01, \
1212 0x27, 0x01, 0x53, 0x01, 0x98, 0x01, 0xCE, 0x02, 0x22, 0x02, \
1213 0x43, 0x02, 0x50, 0x02, 0x9E, 0x02, 0xDD, 0x03, 0x00, 0x03, \
1214 0x2E, 0x03, 0x54, 0x03, 0x7F, 0x03, 0x95, 0x03, 0xB3, 0x03, \
1215 0xC2, 0x03, 0xE1, 0x03, 0xF1, 0x03, 0xFE
1216
1217/*
1218 * The Hydis HVA40WV1 panel
1219 */
1220static const struct nt35510_config nt35510_hydis_hva40wv1 = {
1221 .width_mm = 52,
1222 .height_mm = 86,
1223 /**
1224 * As the Hydis panel is used in command mode, the porches etc
1225 * are settings programmed internally into the NT35510 controller
1226 * and generated toward the physical display. As the panel is not
1227 * used in video mode, these are not really exposed to the DSI
1228 * host.
1229 *
1230 * Display frame rate control:
1231 * Frame rate = (20 MHz / 1) / (389 * (7 + 50 + 800)) ~= 60 Hz
1232 */
1233 .mode = {
1234 /* The internal pixel clock of the NT35510 is 20 MHz */
1235 .clock = 20000,
1236 .hdisplay = 480,
1237 .hsync_start = 480 + 2, /* HFP = 2 */
1238 .hsync_end = 480 + 2 + 0, /* HSync = 0 */
1239 .htotal = 480 + 2 + 0 + 5, /* HBP = 5 */
1240 .vdisplay = 800,
1241 .vsync_start = 800 + 2, /* VFP = 2 */
1242 .vsync_end = 800 + 2 + 0, /* VSync = 0 */
1243 .vtotal = 800 + 2 + 0 + 5, /* VBP = 5 */
1244 .flags = 0,
1245 },
1246 .mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS,
1247 .cmds = NT35510_CMD_CORRECT_GAMMA,
1248 /* 0x09: AVDD = 5.6V */
1249 .avdd = { 0x09, 0x09, 0x09 },
1250 /* 0x34: PCK = Hsync/2, BTP = 2 x VDDB */
1251 .bt1ctr = { 0x34, 0x34, 0x34 },
1252 /* 0x09: AVEE = -5.6V */
1253 .avee = { 0x09, 0x09, 0x09 },
1254 /* 0x24: NCK = Hsync/2, BTN = -2 x VDDB */
1255 .bt2ctr = { 0x24, 0x24, 0x24 },
1256 /* VBCLA: -2.5V, VBCLB: -2.5V, VBCLC: -2.5V */
1257 .vcl = { 0x00, 0x00, 0x00 },
1258 /* 0x24: CLCK = Hsync/2, BTN = -1 x VDDB */
1259 .bt3ctr = { 0x24, 0x24, 0x24 },
1260 /* 0x05 = 12V */
1261 .vgh = { 0x05, 0x05, 0x05 },
1262 /* 0x24: NCKA = Hsync/2, VGH = 2 x AVDD - AVEE */
1263 .bt4ctr = { 0x24, 0x24, 0x24 },
1264 /* 0x0B = -13V */
1265 .vgl = { 0x0B, 0x0B, 0x0B },
1266 /* 0x24: LCKA = Hsync, VGL = AVDD + VCL - AVDD */
1267 .bt5ctr = { 0x24, 0x24, 0x24 },
1268 /* VGMP: 0x0A3 = 5.0375V, VGSP = 0V */
1269 .vgp = { 0x00, 0xA3, 0x00 },
1270 /* VGMP: 0x0A3 = 5.0375V, VGSP = 0V */
1271 .vgn = { 0x00, 0xA3, 0x00 },
1272 /* VCMOFFSEL = VCOM voltage offset mode, VCM = 0V */
1273 .vcmoff = { 0x00, 0x00 },
1274 /* Enable TE, EoTP and RGB pixel format */
1275 .dopctr = { NT35510_DOPCTR_0_DSITE | NT35510_DOPCTR_0_EOTP |
1276 NT35510_DOPCTR_0_N565, NT35510_DOPCTR_1_CTB },
1277 .madctl = NT35510_ROTATE_0_SETTING,
1278 /* 0x0A: SDT = 5 us */
1279 .sdhdtctr = 0x0A,
1280 /* EQ control for gate signals, 0x00 = 0 us */
1281 .gseqctr = { 0x00, 0x00 },
1282 /* SDEQCTR: source driver EQ mode 2, 2.5 us rise time on each step */
1283 .sdeqctr = { 0x01, 0x05, 0x05, 0x05 },
1284 /* SDVPCTR: Normal operation off color during v porch */
1285 .sdvpctr = 0x01,
1286 /* T1: number of pixel clocks on one scanline: 0x184 = 389 clocks */
1287 .t1 = 0x0184,
1288 /* VBP: vertical back porch toward the panel */
1289 .vbp = 7,
1290 /* VFP: vertical front porch toward the panel */
1291 .vfp = 50,
1292 /* PSEL: divide pixel clock 20MHz with 1 (no clock downscaling) */
1293 .psel = 0,
1294 /* DPTMCTR12: 0x03: LVGL = VGLX, overlap mode, swap R->L O->E */
1295 .dpmctr12 = { 0x03, 0x00, 0x00, },
1296 /* Default gamma correction values */
1297 .gamma_corr_pos_r = { NT35510_GAMMA_POS_DEFAULT },
1298 .gamma_corr_pos_g = { NT35510_GAMMA_POS_DEFAULT },
1299 .gamma_corr_pos_b = { NT35510_GAMMA_POS_DEFAULT },
1300 .gamma_corr_neg_r = { NT35510_GAMMA_NEG_DEFAULT },
1301 .gamma_corr_neg_g = { NT35510_GAMMA_NEG_DEFAULT },
1302 .gamma_corr_neg_b = { NT35510_GAMMA_NEG_DEFAULT },
1303};
1304
1305static const struct nt35510_config nt35510_frida_frd400b25025 = {
1306 .width_mm = 52,
1307 .height_mm = 86,
1308 .mode = {
1309 .clock = 23000,
1310 .hdisplay = 480,
1311 .hsync_start = 480 + 34, /* HFP = 34 */
1312 .hsync_end = 480 + 34 + 2, /* HSync = 2 */
1313 .htotal = 480 + 34 + 2 + 34, /* HBP = 34 */
1314 .vdisplay = 800,
1315 .vsync_start = 800 + 15, /* VFP = 15 */
1316 .vsync_end = 800 + 15 + 12, /* VSync = 12 */
1317 .vtotal = 800 + 15 + 12 + 15, /* VBP = 15 */
1318 .flags = 0,
1319 },
1320 .mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
1321 MIPI_DSI_MODE_LPM,
1322 .cmds = NT35510_CMD_CONTROL_DISPLAY,
1323 /* 0x03: AVDD = 6.2V */
1324 .avdd = { 0x03, 0x03, 0x03 },
1325 /* 0x46: PCK = 2 x Hsync, BTP = 2.5 x VDDB */
1326 .bt1ctr = { 0x46, 0x46, 0x46 },
1327 /* 0x03: AVEE = -6.2V */
1328 .avee = { 0x03, 0x03, 0x03 },
1329 /* 0x36: PCK = 2 x Hsync, BTP = 2 x VDDB */
1330 .bt2ctr = { 0x36, 0x36, 0x36 },
1331 /* VBCLA: -2.5V, VBCLB: -2.5V, VBCLC: -3.5V */
1332 .vcl = { 0x00, 0x00, 0x02 },
1333 /* 0x26: CLCK = 2 x Hsync, BTN = -1 x VDDB */
1334 .bt3ctr = { 0x26, 0x26, 0x26 },
1335 /* 0x09 = 16V */
1336 .vgh = { 0x09, 0x09, 0x09 },
1337 /* 0x36: HCK = 2 x Hsync, VGH = 2 x AVDD - AVEE */
1338 .bt4ctr = { 0x36, 0x36, 0x36 },
1339 /* 0x08 = -10V */
1340 .vgl = { 0x08, 0x08, 0x08 },
1341 /* 0x26: LCK = 2 x Hsync, VGL = AVDD + VCL - AVDD */
1342 .bt5ctr = { 0x26, 0x26, 0x26 },
1343 /* VGMP: 0x080 = 4.6V, VGSP = 0V */
1344 .vgp = { 0x00, 0x80, 0x00 },
1345 /* VGMP: 0x080 = 4.6V, VGSP = 0V */
1346 .vgn = { 0x00, 0x80, 0x00 },
1347 /* VCMOFFSEL = VCOM voltage offset mode, VCM = -1V */
1348 .vcmoff = { 0x00, 0x50 },
1349 .dopctr = { NT35510_DOPCTR_0_RAMKP | NT35510_DOPCTR_0_DSITE |
1350 NT35510_DOPCTR_0_DSIG | NT35510_DOPCTR_0_DSIM |
1351 NT35510_DOPCTR_0_EOTP | NT35510_DOPCTR_0_N565, 0 },
1352 .madctl = NT35510_ROTATE_180_SETTING,
1353 /* 0x03: SDT = 1.5 us */
1354 .sdhdtctr = 0x03,
1355 /* EQ control for gate signals, 0x00 = 0 us */
1356 .gseqctr = { 0x00, 0x00 },
1357 /* SDEQCTR: source driver EQ mode 2, 1 us rise time on each step */
1358 .sdeqctr = { 0x01, 0x02, 0x02, 0x02 },
1359 /* SDVPCTR: Normal operation off color during v porch */
1360 .sdvpctr = 0x01,
1361 /* T1: number of pixel clocks on one scanline: 0x184 = 389 clocks */
1362 .t1 = 0x0184,
1363 /* VBP: vertical back porch toward the panel */
1364 .vbp = 0x1C,
1365 /* VFP: vertical front porch toward the panel */
1366 .vfp = 0x1C,
1367 /* PSEL: divide pixel clock 23MHz with 1 (no clock downscaling) */
1368 .psel = 0,
1369 /* DPTMCTR12: 0x03: LVGL = VGLX, overlap mode, swap R->L O->E */
1370 .dpmctr12 = { 0x03, 0x00, 0x00, },
1371 /* write display brightness */
1372 .wrdisbv = 0x7f,
1373 /* write control display */
1374 .wrctrld = NT35510_WRCTRLD_BCTRL | NT35510_WRCTRLD_DD |
1375 NT35510_WRCTRLD_BL,
1376 /* write content adaptive brightness control */
1377 .wrcabc = NT35510_WRCABC_STILL_MODE,
1378 /* write CABC minimum brightness */
1379 .wrcabcmb = 0xff,
1380};
1381
1382static const struct of_device_id nt35510_of_match[] = {
1383 {
1384 .compatible = "frida,frd400b25025",
1385 .data = &nt35510_frida_frd400b25025,
1386 },
1387 {
1388 .compatible = "hydis,hva40wv1",
1389 .data = &nt35510_hydis_hva40wv1,
1390 },
1391 { }
1392};
1393MODULE_DEVICE_TABLE(of, nt35510_of_match);
1394
1395static struct mipi_dsi_driver nt35510_driver = {
1396 .probe = nt35510_probe,
1397 .remove = nt35510_remove,
1398 .driver = {
1399 .name = "panel-novatek-nt35510",
1400 .of_match_table = nt35510_of_match,
1401 },
1402};
1403module_mipi_dsi_driver(nt35510_driver);
1404
1405MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
1406MODULE_DESCRIPTION("NT35510-based panel driver");
1407MODULE_LICENSE("GPL v2");
1408

source code of linux/drivers/gpu/drm/panel/panel-novatek-nt35510.c