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Merge tag 'trace-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / stm / ltdc.c
1 /*
2 * Copyright (C) STMicroelectronics SA 2017
3 *
4 * Authors: Philippe Cornu <philippe.cornu@st.com>
5 * Yannick Fertre <yannick.fertre@st.com>
6 * Fabien Dessenne <fabien.dessenne@st.com>
7 * Mickael Reulier <mickael.reulier@st.com>
8 *
9 * License terms: GNU General Public License (GPL), version 2
10 */
11
12 #include <linux/clk.h>
13 #include <linux/component.h>
14 #include <linux/of_address.h>
15 #include <linux/of_graph.h>
16 #include <linux/reset.h>
17
18 #include <drm/drm_atomic.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_crtc_helper.h>
21 #include <drm/drm_fb_cma_helper.h>
22 #include <drm/drm_gem_cma_helper.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_panel.h>
25 #include <drm/drm_plane_helper.h>
26
27 #include <video/videomode.h>
28
29 #include "ltdc.h"
30
31 #define NB_CRTC 1
32 #define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
33
34 #define MAX_IRQ 4
35
36 #define HWVER_10200 0x010200
37 #define HWVER_10300 0x010300
38 #define HWVER_20101 0x020101
39
40 /*
41 * The address of some registers depends on the HW version: such registers have
42 * an extra offset specified with reg_ofs.
43 */
44 #define REG_OFS_NONE 0
45 #define REG_OFS_4 4 /* Insertion of "Layer Configuration 2" reg */
46 #define REG_OFS (ldev->caps.reg_ofs)
47 #define LAY_OFS 0x80 /* Register Offset between 2 layers */
48
49 /* Global register offsets */
50 #define LTDC_IDR 0x0000 /* IDentification */
51 #define LTDC_LCR 0x0004 /* Layer Count */
52 #define LTDC_SSCR 0x0008 /* Synchronization Size Configuration */
53 #define LTDC_BPCR 0x000C /* Back Porch Configuration */
54 #define LTDC_AWCR 0x0010 /* Active Width Configuration */
55 #define LTDC_TWCR 0x0014 /* Total Width Configuration */
56 #define LTDC_GCR 0x0018 /* Global Control */
57 #define LTDC_GC1R 0x001C /* Global Configuration 1 */
58 #define LTDC_GC2R 0x0020 /* Global Configuration 2 */
59 #define LTDC_SRCR 0x0024 /* Shadow Reload Configuration */
60 #define LTDC_GACR 0x0028 /* GAmma Correction */
61 #define LTDC_BCCR 0x002C /* Background Color Configuration */
62 #define LTDC_IER 0x0034 /* Interrupt Enable */
63 #define LTDC_ISR 0x0038 /* Interrupt Status */
64 #define LTDC_ICR 0x003C /* Interrupt Clear */
65 #define LTDC_LIPCR 0x0040 /* Line Interrupt Position Configuration */
66 #define LTDC_CPSR 0x0044 /* Current Position Status */
67 #define LTDC_CDSR 0x0048 /* Current Display Status */
68
69 /* Layer register offsets */
70 #define LTDC_L1LC1R (0x0080) /* L1 Layer Configuration 1 */
71 #define LTDC_L1LC2R (0x0084) /* L1 Layer Configuration 2 */
72 #define LTDC_L1CR (0x0084 + REG_OFS) /* L1 Control */
73 #define LTDC_L1WHPCR (0x0088 + REG_OFS) /* L1 Window Hor Position Config */
74 #define LTDC_L1WVPCR (0x008C + REG_OFS) /* L1 Window Vert Position Config */
75 #define LTDC_L1CKCR (0x0090 + REG_OFS) /* L1 Color Keying Configuration */
76 #define LTDC_L1PFCR (0x0094 + REG_OFS) /* L1 Pixel Format Configuration */
77 #define LTDC_L1CACR (0x0098 + REG_OFS) /* L1 Constant Alpha Config */
78 #define LTDC_L1DCCR (0x009C + REG_OFS) /* L1 Default Color Configuration */
79 #define LTDC_L1BFCR (0x00A0 + REG_OFS) /* L1 Blend Factors Configuration */
80 #define LTDC_L1FBBCR (0x00A4 + REG_OFS) /* L1 FrameBuffer Bus Control */
81 #define LTDC_L1AFBCR (0x00A8 + REG_OFS) /* L1 AuxFB Control */
82 #define LTDC_L1CFBAR (0x00AC + REG_OFS) /* L1 Color FrameBuffer Address */
83 #define LTDC_L1CFBLR (0x00B0 + REG_OFS) /* L1 Color FrameBuffer Length */
84 #define LTDC_L1CFBLNR (0x00B4 + REG_OFS) /* L1 Color FrameBuffer Line Nb */
85 #define LTDC_L1AFBAR (0x00B8 + REG_OFS) /* L1 AuxFB Address */
86 #define LTDC_L1AFBLR (0x00BC + REG_OFS) /* L1 AuxFB Length */
87 #define LTDC_L1AFBLNR (0x00C0 + REG_OFS) /* L1 AuxFB Line Number */
88 #define LTDC_L1CLUTWR (0x00C4 + REG_OFS) /* L1 CLUT Write */
89 #define LTDC_L1YS1R (0x00E0 + REG_OFS) /* L1 YCbCr Scale 1 */
90 #define LTDC_L1YS2R (0x00E4 + REG_OFS) /* L1 YCbCr Scale 2 */
91
92 /* Bit definitions */
93 #define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */
94 #define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */
95
96 #define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */
97 #define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */
98
99 #define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */
100 #define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */
101
102 #define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */
103 #define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */
104
105 #define GCR_LTDCEN BIT(0) /* LTDC ENable */
106 #define GCR_DEN BIT(16) /* Dither ENable */
107 #define GCR_PCPOL BIT(28) /* Pixel Clock POLarity */
108 #define GCR_DEPOL BIT(29) /* Data Enable POLarity */
109 #define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity */
110 #define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity */
111
112 #define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */
113 #define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */
114 #define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */
115 #define GC1R_PBEN BIT(12) /* Precise Blending ENable */
116 #define GC1R_DT GENMASK(15, 14) /* Dithering Technique */
117 #define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */
118 #define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */
119 #define GC1R_BCP BIT(22) /* Background Colour Programmable */
120 #define GC1R_BBEN BIT(23) /* Background Blending ENabled */
121 #define GC1R_LNIP BIT(24) /* Line Number IRQ Position */
122 #define GC1R_TP BIT(25) /* Timing Programmable */
123 #define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */
124 #define GC1R_SPP BIT(27) /* Sync Polarity Programmable */
125 #define GC1R_DWP BIT(28) /* Dither Width Programmable */
126 #define GC1R_STREN BIT(29) /* STatus Registers ENabled */
127 #define GC1R_BMEN BIT(31) /* Blind Mode ENabled */
128
129 #define GC2R_EDCA BIT(0) /* External Display Control Ability */
130 #define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */
131 #define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */
132 #define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */
133 #define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */
134 #define GC2R_EDCEN BIT(7) /* External Display Control ENabled */
135
136 #define SRCR_IMR BIT(0) /* IMmediate Reload */
137 #define SRCR_VBR BIT(1) /* Vertical Blanking Reload */
138
139 #define BCCR_BCBLACK 0x00 /* Background Color BLACK */
140 #define BCCR_BCBLUE GENMASK(7, 0) /* Background Color BLUE */
141 #define BCCR_BCGREEN GENMASK(15, 8) /* Background Color GREEN */
142 #define BCCR_BCRED GENMASK(23, 16) /* Background Color RED */
143 #define BCCR_BCWHITE GENMASK(23, 0) /* Background Color WHITE */
144
145 #define IER_LIE BIT(0) /* Line Interrupt Enable */
146 #define IER_FUIE BIT(1) /* Fifo Underrun Interrupt Enable */
147 #define IER_TERRIE BIT(2) /* Transfer ERRor Interrupt Enable */
148 #define IER_RRIE BIT(3) /* Register Reload Interrupt enable */
149
150 #define ISR_LIF BIT(0) /* Line Interrupt Flag */
151 #define ISR_FUIF BIT(1) /* Fifo Underrun Interrupt Flag */
152 #define ISR_TERRIF BIT(2) /* Transfer ERRor Interrupt Flag */
153 #define ISR_RRIF BIT(3) /* Register Reload Interrupt Flag */
154
155 #define LXCR_LEN BIT(0) /* Layer ENable */
156 #define LXCR_COLKEN BIT(1) /* Color Keying Enable */
157 #define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */
158
159 #define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */
160 #define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */
161
162 #define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */
163 #define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */
164
165 #define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */
166
167 #define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */
168
169 #define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */
170 #define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */
171
172 #define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */
173 #define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */
174
175 #define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
176
177 #define HSPOL_AL 0 /* Horizontal Sync POLarity Active Low */
178 #define VSPOL_AL 0 /* Vertical Sync POLarity Active Low */
179 #define DEPOL_AL 0 /* Data Enable POLarity Active Low */
180 #define PCPOL_IPC 0 /* Input Pixel Clock */
181 #define HSPOL_AH GCR_HSPOL /* Horizontal Sync POLarity Active High */
182 #define VSPOL_AH GCR_VSPOL /* Vertical Sync POLarity Active High */
183 #define DEPOL_AH GCR_DEPOL /* Data Enable POLarity Active High */
184 #define PCPOL_IIPC GCR_PCPOL /* Inverted Input Pixel Clock */
185 #define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */
186 #define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
187 #define BF1_CA 0x400 /* Constant Alpha */
188 #define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
189 #define BF2_1CA 0x005 /* 1 - Constant Alpha */
190
191 #define NB_PF 8 /* Max nb of HW pixel format */
192
193 enum ltdc_pix_fmt {
194 PF_NONE,
195 /* RGB formats */
196 PF_ARGB8888, /* ARGB [32 bits] */
197 PF_RGBA8888, /* RGBA [32 bits] */
198 PF_RGB888, /* RGB [24 bits] */
199 PF_RGB565, /* RGB [16 bits] */
200 PF_ARGB1555, /* ARGB A:1 bit RGB:15 bits [16 bits] */
201 PF_ARGB4444, /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
202 /* Indexed formats */
203 PF_L8, /* Indexed 8 bits [8 bits] */
204 PF_AL44, /* Alpha:4 bits + indexed 4 bits [8 bits] */
205 PF_AL88 /* Alpha:8 bits + indexed 8 bits [16 bits] */
206 };
207
208 /* The index gives the encoding of the pixel format for an HW version */
209 static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
210 PF_ARGB8888, /* 0x00 */
211 PF_RGB888, /* 0x01 */
212 PF_RGB565, /* 0x02 */
213 PF_ARGB1555, /* 0x03 */
214 PF_ARGB4444, /* 0x04 */
215 PF_L8, /* 0x05 */
216 PF_AL44, /* 0x06 */
217 PF_AL88 /* 0x07 */
218 };
219
220 static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
221 PF_ARGB8888, /* 0x00 */
222 PF_RGB888, /* 0x01 */
223 PF_RGB565, /* 0x02 */
224 PF_RGBA8888, /* 0x03 */
225 PF_AL44, /* 0x04 */
226 PF_L8, /* 0x05 */
227 PF_ARGB1555, /* 0x06 */
228 PF_ARGB4444 /* 0x07 */
229 };
230
231 static inline u32 reg_read(void __iomem *base, u32 reg)
232 {
233 return readl_relaxed(base + reg);
234 }
235
236 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
237 {
238 writel_relaxed(val, base + reg);
239 }
240
241 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
242 {
243 reg_write(base, reg, reg_read(base, reg) | mask);
244 }
245
246 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
247 {
248 reg_write(base, reg, reg_read(base, reg) & ~mask);
249 }
250
251 static inline void reg_update_bits(void __iomem *base, u32 reg, u32 mask,
252 u32 val)
253 {
254 reg_write(base, reg, (reg_read(base, reg) & ~mask) | val);
255 }
256
257 static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc)
258 {
259 return (struct ltdc_device *)crtc->dev->dev_private;
260 }
261
262 static inline struct ltdc_device *plane_to_ltdc(struct drm_plane *plane)
263 {
264 return (struct ltdc_device *)plane->dev->dev_private;
265 }
266
267 static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc)
268 {
269 return (struct ltdc_device *)enc->dev->dev_private;
270 }
271
272 static inline struct ltdc_device *connector_to_ltdc(struct drm_connector *con)
273 {
274 return (struct ltdc_device *)con->dev->dev_private;
275 }
276
277 static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
278 {
279 enum ltdc_pix_fmt pf;
280
281 switch (drm_fmt) {
282 case DRM_FORMAT_ARGB8888:
283 case DRM_FORMAT_XRGB8888:
284 pf = PF_ARGB8888;
285 break;
286 case DRM_FORMAT_RGBA8888:
287 case DRM_FORMAT_RGBX8888:
288 pf = PF_RGBA8888;
289 break;
290 case DRM_FORMAT_RGB888:
291 pf = PF_RGB888;
292 break;
293 case DRM_FORMAT_RGB565:
294 pf = PF_RGB565;
295 break;
296 case DRM_FORMAT_ARGB1555:
297 case DRM_FORMAT_XRGB1555:
298 pf = PF_ARGB1555;
299 break;
300 case DRM_FORMAT_ARGB4444:
301 case DRM_FORMAT_XRGB4444:
302 pf = PF_ARGB4444;
303 break;
304 case DRM_FORMAT_C8:
305 pf = PF_L8;
306 break;
307 default:
308 pf = PF_NONE;
309 break;
310 /* Note: There are no DRM_FORMAT for AL44 and AL88 */
311 }
312
313 return pf;
314 }
315
316 static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
317 {
318 switch (pf) {
319 case PF_ARGB8888:
320 return DRM_FORMAT_ARGB8888;
321 case PF_RGBA8888:
322 return DRM_FORMAT_RGBA8888;
323 case PF_RGB888:
324 return DRM_FORMAT_RGB888;
325 case PF_RGB565:
326 return DRM_FORMAT_RGB565;
327 case PF_ARGB1555:
328 return DRM_FORMAT_ARGB1555;
329 case PF_ARGB4444:
330 return DRM_FORMAT_ARGB4444;
331 case PF_L8:
332 return DRM_FORMAT_C8;
333 case PF_AL44: /* No DRM support */
334 case PF_AL88: /* No DRM support */
335 case PF_NONE:
336 default:
337 return 0;
338 }
339 }
340
341 static irqreturn_t ltdc_irq_thread(int irq, void *arg)
342 {
343 struct drm_device *ddev = arg;
344 struct ltdc_device *ldev = ddev->dev_private;
345 struct drm_crtc *crtc = drm_crtc_from_index(ddev, 0);
346
347 /* Line IRQ : trigger the vblank event */
348 if (ldev->irq_status & ISR_LIF)
349 drm_crtc_handle_vblank(crtc);
350
351 /* Save FIFO Underrun & Transfer Error status */
352 mutex_lock(&ldev->err_lock);
353 if (ldev->irq_status & ISR_FUIF)
354 ldev->error_status |= ISR_FUIF;
355 if (ldev->irq_status & ISR_TERRIF)
356 ldev->error_status |= ISR_TERRIF;
357 mutex_unlock(&ldev->err_lock);
358
359 return IRQ_HANDLED;
360 }
361
362 static irqreturn_t ltdc_irq(int irq, void *arg)
363 {
364 struct drm_device *ddev = arg;
365 struct ltdc_device *ldev = ddev->dev_private;
366
367 /* Read & Clear the interrupt status */
368 ldev->irq_status = reg_read(ldev->regs, LTDC_ISR);
369 reg_write(ldev->regs, LTDC_ICR, ldev->irq_status);
370
371 return IRQ_WAKE_THREAD;
372 }
373
374 /*
375 * DRM_CRTC
376 */
377
378 static void ltdc_crtc_load_lut(struct drm_crtc *crtc)
379 {
380 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
381 unsigned int i, lay;
382
383 for (lay = 0; lay < ldev->caps.nb_layers; lay++)
384 for (i = 0; i < 256; i++)
385 reg_write(ldev->regs, LTDC_L1CLUTWR + lay * LAY_OFS,
386 ldev->clut[i]);
387 }
388
389 static void ltdc_crtc_enable(struct drm_crtc *crtc)
390 {
391 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
392
393 DRM_DEBUG_DRIVER("\n");
394
395 /* Sets the background color value */
396 reg_write(ldev->regs, LTDC_BCCR, BCCR_BCBLACK);
397
398 /* Enable IRQ */
399 reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
400
401 /* Immediately commit the planes */
402 reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
403
404 /* Enable LTDC */
405 reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
406
407 drm_crtc_vblank_on(crtc);
408 }
409
410 static void ltdc_crtc_disable(struct drm_crtc *crtc)
411 {
412 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
413
414 DRM_DEBUG_DRIVER("\n");
415
416 drm_crtc_vblank_off(crtc);
417
418 /* disable LTDC */
419 reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
420
421 /* disable IRQ */
422 reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
423
424 /* immediately commit disable of layers before switching off LTDC */
425 reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
426 }
427
428 static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
429 {
430 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
431 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
432 struct videomode vm;
433 int rate = mode->clock * 1000;
434 u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
435 u32 total_width, total_height;
436 u32 val;
437
438 drm_display_mode_to_videomode(mode, &vm);
439
440 DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name);
441 DRM_DEBUG_DRIVER("Video mode: %dx%d", vm.hactive, vm.vactive);
442 DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
443 vm.hfront_porch, vm.hback_porch, vm.hsync_len,
444 vm.vfront_porch, vm.vback_porch, vm.vsync_len);
445
446 /* Convert video timings to ltdc timings */
447 hsync = vm.hsync_len - 1;
448 vsync = vm.vsync_len - 1;
449 accum_hbp = hsync + vm.hback_porch;
450 accum_vbp = vsync + vm.vback_porch;
451 accum_act_w = accum_hbp + vm.hactive;
452 accum_act_h = accum_vbp + vm.vactive;
453 total_width = accum_act_w + vm.hfront_porch;
454 total_height = accum_act_h + vm.vfront_porch;
455
456 clk_disable(ldev->pixel_clk);
457
458 if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
459 DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
460 return;
461 }
462
463 clk_enable(ldev->pixel_clk);
464
465 /* Configures the HS, VS, DE and PC polarities. */
466 val = HSPOL_AL | VSPOL_AL | DEPOL_AL | PCPOL_IPC;
467
468 if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
469 val |= HSPOL_AH;
470
471 if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
472 val |= VSPOL_AH;
473
474 if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
475 val |= DEPOL_AH;
476
477 if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
478 val |= PCPOL_IIPC;
479
480 reg_update_bits(ldev->regs, LTDC_GCR,
481 GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
482
483 /* Set Synchronization size */
484 val = (hsync << 16) | vsync;
485 reg_update_bits(ldev->regs, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
486
487 /* Set Accumulated Back porch */
488 val = (accum_hbp << 16) | accum_vbp;
489 reg_update_bits(ldev->regs, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
490
491 /* Set Accumulated Active Width */
492 val = (accum_act_w << 16) | accum_act_h;
493 reg_update_bits(ldev->regs, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
494
495 /* Set total width & height */
496 val = (total_width << 16) | total_height;
497 reg_update_bits(ldev->regs, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
498
499 reg_write(ldev->regs, LTDC_LIPCR, (accum_act_h + 1));
500 }
501
502 static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
503 struct drm_crtc_state *old_crtc_state)
504 {
505 struct ltdc_device *ldev = crtc_to_ltdc(crtc);
506 struct drm_pending_vblank_event *event = crtc->state->event;
507
508 DRM_DEBUG_ATOMIC("\n");
509
510 /* Commit shadow registers = update planes at next vblank */
511 reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
512
513 if (event) {
514 crtc->state->event = NULL;
515
516 spin_lock_irq(&crtc->dev->event_lock);
517 if (drm_crtc_vblank_get(crtc) == 0)
518 drm_crtc_arm_vblank_event(crtc, event);
519 else
520 drm_crtc_send_vblank_event(crtc, event);
521 spin_unlock_irq(&crtc->dev->event_lock);
522 }
523 }
524
525 static struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
526 .load_lut = ltdc_crtc_load_lut,
527 .enable = ltdc_crtc_enable,
528 .disable = ltdc_crtc_disable,
529 .mode_set_nofb = ltdc_crtc_mode_set_nofb,
530 .atomic_flush = ltdc_crtc_atomic_flush,
531 };
532
533 int ltdc_crtc_enable_vblank(struct drm_device *ddev, unsigned int pipe)
534 {
535 struct ltdc_device *ldev = ddev->dev_private;
536
537 DRM_DEBUG_DRIVER("\n");
538 reg_set(ldev->regs, LTDC_IER, IER_LIE);
539
540 return 0;
541 }
542
543 void ltdc_crtc_disable_vblank(struct drm_device *ddev, unsigned int pipe)
544 {
545 struct ltdc_device *ldev = ddev->dev_private;
546
547 DRM_DEBUG_DRIVER("\n");
548 reg_clear(ldev->regs, LTDC_IER, IER_LIE);
549 }
550
551 static struct drm_crtc_funcs ltdc_crtc_funcs = {
552 .destroy = drm_crtc_cleanup,
553 .set_config = drm_atomic_helper_set_config,
554 .page_flip = drm_atomic_helper_page_flip,
555 .reset = drm_atomic_helper_crtc_reset,
556 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
557 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
558 };
559
560 /*
561 * DRM_PLANE
562 */
563
564 static int ltdc_plane_atomic_check(struct drm_plane *plane,
565 struct drm_plane_state *state)
566 {
567 struct drm_framebuffer *fb = state->fb;
568 u32 src_x, src_y, src_w, src_h;
569
570 DRM_DEBUG_DRIVER("\n");
571
572 if (!fb)
573 return 0;
574
575 /* convert src_ from 16:16 format */
576 src_x = state->src_x >> 16;
577 src_y = state->src_y >> 16;
578 src_w = state->src_w >> 16;
579 src_h = state->src_h >> 16;
580
581 /* Reject scaling */
582 if ((src_w != state->crtc_w) || (src_h != state->crtc_h)) {
583 DRM_ERROR("Scaling is not supported");
584 return -EINVAL;
585 }
586
587 return 0;
588 }
589
590 static void ltdc_plane_atomic_update(struct drm_plane *plane,
591 struct drm_plane_state *oldstate)
592 {
593 struct ltdc_device *ldev = plane_to_ltdc(plane);
594 struct drm_plane_state *state = plane->state;
595 struct drm_framebuffer *fb = state->fb;
596 u32 lofs = plane->index * LAY_OFS;
597 u32 x0 = state->crtc_x;
598 u32 x1 = state->crtc_x + state->crtc_w - 1;
599 u32 y0 = state->crtc_y;
600 u32 y1 = state->crtc_y + state->crtc_h - 1;
601 u32 src_x, src_y, src_w, src_h;
602 u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr;
603 enum ltdc_pix_fmt pf;
604
605 if (!state->crtc || !fb) {
606 DRM_DEBUG_DRIVER("fb or crtc NULL");
607 return;
608 }
609
610 /* convert src_ from 16:16 format */
611 src_x = state->src_x >> 16;
612 src_y = state->src_y >> 16;
613 src_w = state->src_w >> 16;
614 src_h = state->src_h >> 16;
615
616 DRM_DEBUG_DRIVER(
617 "plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
618 plane->base.id, fb->base.id,
619 src_w, src_h, src_x, src_y,
620 state->crtc_w, state->crtc_h, state->crtc_x, state->crtc_y);
621
622 bpcr = reg_read(ldev->regs, LTDC_BPCR);
623 ahbp = (bpcr & BPCR_AHBP) >> 16;
624 avbp = bpcr & BPCR_AVBP;
625
626 /* Configures the horizontal start and stop position */
627 val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
628 reg_update_bits(ldev->regs, LTDC_L1WHPCR + lofs,
629 LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
630
631 /* Configures the vertical start and stop position */
632 val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
633 reg_update_bits(ldev->regs, LTDC_L1WVPCR + lofs,
634 LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
635
636 /* Specifies the pixel format */
637 pf = to_ltdc_pixelformat(fb->format->format);
638 for (val = 0; val < NB_PF; val++)
639 if (ldev->caps.pix_fmt_hw[val] == pf)
640 break;
641
642 if (val == NB_PF) {
643 DRM_ERROR("Pixel format %.4s not supported\n",
644 (char *)&fb->format->format);
645 val = 0; /* set by default ARGB 32 bits */
646 }
647 reg_update_bits(ldev->regs, LTDC_L1PFCR + lofs, LXPFCR_PF, val);
648
649 /* Configures the color frame buffer pitch in bytes & line length */
650 pitch_in_bytes = fb->pitches[0];
651 line_length = drm_format_plane_cpp(fb->format->format, 0) *
652 (x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1;
653 val = ((pitch_in_bytes << 16) | line_length);
654 reg_update_bits(ldev->regs, LTDC_L1CFBLR + lofs,
655 LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
656
657 /* Specifies the constant alpha value */
658 val = CONSTA_MAX;
659 reg_update_bits(ldev->regs, LTDC_L1CACR + lofs,
660 LXCACR_CONSTA, val);
661
662 /* Specifies the blending factors */
663 val = BF1_PAXCA | BF2_1PAXCA;
664 reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
665 LXBFCR_BF2 | LXBFCR_BF1, val);
666
667 /* Configures the frame buffer line number */
668 val = y1 - y0 + 1;
669 reg_update_bits(ldev->regs, LTDC_L1CFBLNR + lofs,
670 LXCFBLNR_CFBLN, val);
671
672 /* Sets the FB address */
673 paddr = (u32)drm_fb_cma_get_gem_addr(fb, state, 0);
674
675 DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
676 reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr);
677
678 /* Enable layer and CLUT if needed */
679 val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
680 val |= LXCR_LEN;
681 reg_update_bits(ldev->regs, LTDC_L1CR + lofs,
682 LXCR_LEN | LXCR_CLUTEN, val);
683
684 mutex_lock(&ldev->err_lock);
685 if (ldev->error_status & ISR_FUIF) {
686 DRM_DEBUG_DRIVER("Fifo underrun\n");
687 ldev->error_status &= ~ISR_FUIF;
688 }
689 if (ldev->error_status & ISR_TERRIF) {
690 DRM_DEBUG_DRIVER("Transfer error\n");
691 ldev->error_status &= ~ISR_TERRIF;
692 }
693 mutex_unlock(&ldev->err_lock);
694 }
695
696 static void ltdc_plane_atomic_disable(struct drm_plane *plane,
697 struct drm_plane_state *oldstate)
698 {
699 struct ltdc_device *ldev = plane_to_ltdc(plane);
700 u32 lofs = plane->index * LAY_OFS;
701
702 /* disable layer */
703 reg_clear(ldev->regs, LTDC_L1CR + lofs, LXCR_LEN);
704
705 DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
706 oldstate->crtc->base.id, plane->base.id);
707 }
708
709 static struct drm_plane_funcs ltdc_plane_funcs = {
710 .update_plane = drm_atomic_helper_update_plane,
711 .disable_plane = drm_atomic_helper_disable_plane,
712 .destroy = drm_plane_cleanup,
713 .set_property = drm_atomic_helper_plane_set_property,
714 .reset = drm_atomic_helper_plane_reset,
715 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
716 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
717 };
718
719 static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
720 .atomic_check = ltdc_plane_atomic_check,
721 .atomic_update = ltdc_plane_atomic_update,
722 .atomic_disable = ltdc_plane_atomic_disable,
723 };
724
725 static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
726 enum drm_plane_type type)
727 {
728 unsigned long possible_crtcs = CRTC_MASK;
729 struct ltdc_device *ldev = ddev->dev_private;
730 struct device *dev = ddev->dev;
731 struct drm_plane *plane;
732 unsigned int i, nb_fmt = 0;
733 u32 formats[NB_PF];
734 u32 drm_fmt;
735 int ret;
736
737 /* Get supported pixel formats */
738 for (i = 0; i < NB_PF; i++) {
739 drm_fmt = to_drm_pixelformat(ldev->caps.pix_fmt_hw[i]);
740 if (!drm_fmt)
741 continue;
742 formats[nb_fmt++] = drm_fmt;
743 }
744
745 plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
746 if (!plane)
747 return 0;
748
749 ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
750 &ltdc_plane_funcs, formats, nb_fmt,
751 type, NULL);
752 if (ret < 0)
753 return 0;
754
755 drm_plane_helper_add(plane, &ltdc_plane_helper_funcs);
756
757 DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
758
759 return plane;
760 }
761
762 static void ltdc_plane_destroy_all(struct drm_device *ddev)
763 {
764 struct drm_plane *plane, *plane_temp;
765
766 list_for_each_entry_safe(plane, plane_temp,
767 &ddev->mode_config.plane_list, head)
768 drm_plane_cleanup(plane);
769 }
770
771 static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
772 {
773 struct ltdc_device *ldev = ddev->dev_private;
774 struct drm_plane *primary, *overlay;
775 unsigned int i;
776 int res;
777
778 primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
779 if (!primary) {
780 DRM_ERROR("Can not create primary plane\n");
781 return -EINVAL;
782 }
783
784 res = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
785 &ltdc_crtc_funcs, NULL);
786 if (res) {
787 DRM_ERROR("Can not initialize CRTC\n");
788 goto cleanup;
789 }
790
791 drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);
792
793 DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
794
795 /* Add planes. Note : the first layer is used by primary plane */
796 for (i = 1; i < ldev->caps.nb_layers; i++) {
797 overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY);
798 if (!overlay) {
799 res = -ENOMEM;
800 DRM_ERROR("Can not create overlay plane %d\n", i);
801 goto cleanup;
802 }
803 }
804
805 return 0;
806
807 cleanup:
808 ltdc_plane_destroy_all(ddev);
809 return res;
810 }
811
812 /*
813 * DRM_ENCODER
814 */
815
816 static void ltdc_rgb_encoder_enable(struct drm_encoder *encoder)
817 {
818 struct ltdc_device *ldev = encoder_to_ltdc(encoder);
819
820 DRM_DEBUG_DRIVER("\n");
821
822 drm_panel_prepare(ldev->panel);
823 drm_panel_enable(ldev->panel);
824 }
825
826 static void ltdc_rgb_encoder_disable(struct drm_encoder *encoder)
827 {
828 struct ltdc_device *ldev = encoder_to_ltdc(encoder);
829
830 DRM_DEBUG_DRIVER("\n");
831
832 drm_panel_disable(ldev->panel);
833 drm_panel_unprepare(ldev->panel);
834 }
835
836 static const struct drm_encoder_helper_funcs ltdc_rgb_encoder_helper_funcs = {
837 .enable = ltdc_rgb_encoder_enable,
838 .disable = ltdc_rgb_encoder_disable,
839 };
840
841 static const struct drm_encoder_funcs ltdc_rgb_encoder_funcs = {
842 .destroy = drm_encoder_cleanup,
843 };
844
845 static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev)
846 {
847 struct drm_encoder *encoder;
848
849 encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
850 if (!encoder)
851 return NULL;
852
853 encoder->possible_crtcs = CRTC_MASK;
854 encoder->possible_clones = 0; /* No cloning support */
855
856 drm_encoder_init(ddev, encoder, &ltdc_rgb_encoder_funcs,
857 DRM_MODE_ENCODER_DPI, NULL);
858
859 drm_encoder_helper_add(encoder, &ltdc_rgb_encoder_helper_funcs);
860
861 DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
862
863 return encoder;
864 }
865
866 /*
867 * DRM_CONNECTOR
868 */
869
870 static int ltdc_rgb_connector_get_modes(struct drm_connector *connector)
871 {
872 struct drm_device *ddev = connector->dev;
873 struct ltdc_device *ldev = ddev->dev_private;
874 int ret = 0;
875
876 DRM_DEBUG_DRIVER("\n");
877
878 if (ldev->panel)
879 ret = drm_panel_get_modes(ldev->panel);
880
881 return ret < 0 ? 0 : ret;
882 }
883
884 static struct drm_connector_helper_funcs ltdc_rgb_connector_helper_funcs = {
885 .get_modes = ltdc_rgb_connector_get_modes,
886 };
887
888 static enum drm_connector_status
889 ltdc_rgb_connector_detect(struct drm_connector *connector, bool force)
890 {
891 struct ltdc_device *ldev = connector_to_ltdc(connector);
892
893 return ldev->panel ? connector_status_connected :
894 connector_status_disconnected;
895 }
896
897 static void ltdc_rgb_connector_destroy(struct drm_connector *connector)
898 {
899 DRM_DEBUG_DRIVER("\n");
900
901 drm_connector_unregister(connector);
902 drm_connector_cleanup(connector);
903 }
904
905 static const struct drm_connector_funcs ltdc_rgb_connector_funcs = {
906 .dpms = drm_atomic_helper_connector_dpms,
907 .fill_modes = drm_helper_probe_single_connector_modes,
908 .detect = ltdc_rgb_connector_detect,
909 .destroy = ltdc_rgb_connector_destroy,
910 .reset = drm_atomic_helper_connector_reset,
911 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
912 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
913 };
914
915 struct drm_connector *ltdc_rgb_connector_create(struct drm_device *ddev)
916 {
917 struct drm_connector *connector;
918 int err;
919
920 connector = devm_kzalloc(ddev->dev, sizeof(*connector), GFP_KERNEL);
921 if (!connector) {
922 DRM_ERROR("Failed to allocate connector\n");
923 return NULL;
924 }
925
926 connector->polled = DRM_CONNECTOR_POLL_HPD;
927
928 err = drm_connector_init(ddev, connector, &ltdc_rgb_connector_funcs,
929 DRM_MODE_CONNECTOR_DPI);
930 if (err) {
931 DRM_ERROR("Failed to initialize connector\n");
932 return NULL;
933 }
934
935 drm_connector_helper_add(connector, &ltdc_rgb_connector_helper_funcs);
936
937 DRM_DEBUG_DRIVER("RGB connector:%d created\n", connector->base.id);
938
939 return connector;
940 }
941
942 static int ltdc_get_caps(struct drm_device *ddev)
943 {
944 struct ltdc_device *ldev = ddev->dev_private;
945 u32 bus_width_log2, lcr, gc2r;
946
947 /* at least 1 layer must be managed */
948 lcr = reg_read(ldev->regs, LTDC_LCR);
949
950 ldev->caps.nb_layers = max_t(int, lcr, 1);
951
952 /* set data bus width */
953 gc2r = reg_read(ldev->regs, LTDC_GC2R);
954 bus_width_log2 = (gc2r & GC2R_BW) >> 4;
955 ldev->caps.bus_width = 8 << bus_width_log2;
956 ldev->caps.hw_version = reg_read(ldev->regs, LTDC_IDR);
957
958 switch (ldev->caps.hw_version) {
959 case HWVER_10200:
960 case HWVER_10300:
961 ldev->caps.reg_ofs = REG_OFS_NONE;
962 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
963 break;
964 case HWVER_20101:
965 ldev->caps.reg_ofs = REG_OFS_4;
966 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
967 break;
968 default:
969 return -ENODEV;
970 }
971
972 return 0;
973 }
974
975 static struct drm_panel *ltdc_get_panel(struct drm_device *ddev)
976 {
977 struct device *dev = ddev->dev;
978 struct device_node *np = dev->of_node;
979 struct device_node *entity, *port = NULL;
980 struct drm_panel *panel = NULL;
981
982 DRM_DEBUG_DRIVER("\n");
983
984 /*
985 * Parse ltdc node to get remote port and find RGB panel / HDMI slave
986 * If a dsi or a bridge (hdmi, lvds...) is connected to ltdc,
987 * a remote port & RGB panel will not be found.
988 */
989 for_each_endpoint_of_node(np, entity) {
990 if (!of_device_is_available(entity))
991 continue;
992
993 port = of_graph_get_remote_port_parent(entity);
994 if (port) {
995 panel = of_drm_find_panel(port);
996 of_node_put(port);
997 if (panel) {
998 DRM_DEBUG_DRIVER("remote panel %s\n",
999 port->full_name);
1000 } else {
1001 DRM_DEBUG_DRIVER("panel missing\n");
1002 of_node_put(entity);
1003 }
1004 }
1005 }
1006
1007 return panel;
1008 }
1009
1010 int ltdc_load(struct drm_device *ddev)
1011 {
1012 struct platform_device *pdev = to_platform_device(ddev->dev);
1013 struct ltdc_device *ldev = ddev->dev_private;
1014 struct device *dev = ddev->dev;
1015 struct device_node *np = dev->of_node;
1016 struct drm_encoder *encoder;
1017 struct drm_connector *connector = NULL;
1018 struct drm_crtc *crtc;
1019 struct reset_control *rstc;
1020 struct resource res;
1021 int irq, ret, i;
1022
1023 DRM_DEBUG_DRIVER("\n");
1024
1025 ldev->panel = ltdc_get_panel(ddev);
1026 if (!ldev->panel)
1027 return -EPROBE_DEFER;
1028
1029 rstc = of_reset_control_get(np, NULL);
1030
1031 mutex_init(&ldev->err_lock);
1032
1033 ldev->pixel_clk = devm_clk_get(dev, "lcd");
1034 if (IS_ERR(ldev->pixel_clk)) {
1035 DRM_ERROR("Unable to get lcd clock\n");
1036 return -ENODEV;
1037 }
1038
1039 if (clk_prepare_enable(ldev->pixel_clk)) {
1040 DRM_ERROR("Unable to prepare pixel clock\n");
1041 return -ENODEV;
1042 }
1043
1044 if (of_address_to_resource(np, 0, &res)) {
1045 DRM_ERROR("Unable to get resource\n");
1046 return -ENODEV;
1047 }
1048
1049 ldev->regs = devm_ioremap_resource(dev, &res);
1050 if (IS_ERR(ldev->regs)) {
1051 DRM_ERROR("Unable to get ltdc registers\n");
1052 return PTR_ERR(ldev->regs);
1053 }
1054
1055 for (i = 0; i < MAX_IRQ; i++) {
1056 irq = platform_get_irq(pdev, i);
1057 if (irq < 0)
1058 continue;
1059
1060 ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
1061 ltdc_irq_thread, IRQF_ONESHOT,
1062 dev_name(dev), ddev);
1063 if (ret) {
1064 DRM_ERROR("Failed to register LTDC interrupt\n");
1065 return ret;
1066 }
1067 }
1068
1069 if (!IS_ERR(rstc))
1070 reset_control_deassert(rstc);
1071
1072 /* Disable interrupts */
1073 reg_clear(ldev->regs, LTDC_IER,
1074 IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);
1075
1076 ret = ltdc_get_caps(ddev);
1077 if (ret) {
1078 DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
1079 ldev->caps.hw_version);
1080 return ret;
1081 }
1082
1083 DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
1084
1085 if (ldev->panel) {
1086 encoder = ltdc_rgb_encoder_create(ddev);
1087 if (!encoder) {
1088 DRM_ERROR("Failed to create RGB encoder\n");
1089 ret = -EINVAL;
1090 goto err;
1091 }
1092
1093 connector = ltdc_rgb_connector_create(ddev);
1094 if (!connector) {
1095 DRM_ERROR("Failed to create RGB connector\n");
1096 ret = -EINVAL;
1097 goto err;
1098 }
1099
1100 ret = drm_mode_connector_attach_encoder(connector, encoder);
1101 if (ret) {
1102 DRM_ERROR("Failed to attach connector to encoder\n");
1103 goto err;
1104 }
1105
1106 drm_panel_attach(ldev->panel, connector);
1107 }
1108
1109 crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
1110 if (!crtc) {
1111 DRM_ERROR("Failed to allocate crtc\n");
1112 ret = -ENOMEM;
1113 goto err;
1114 }
1115
1116 ret = ltdc_crtc_init(ddev, crtc);
1117 if (ret) {
1118 DRM_ERROR("Failed to init crtc\n");
1119 goto err;
1120 }
1121
1122 ret = drm_vblank_init(ddev, NB_CRTC);
1123 if (ret) {
1124 DRM_ERROR("Failed calling drm_vblank_init()\n");
1125 goto err;
1126 }
1127
1128 /* Allow usage of vblank without having to call drm_irq_install */
1129 ddev->irq_enabled = 1;
1130
1131 return 0;
1132 err:
1133 if (ldev->panel)
1134 drm_panel_detach(ldev->panel);
1135
1136 clk_disable_unprepare(ldev->pixel_clk);
1137
1138 return ret;
1139 }
1140
1141 void ltdc_unload(struct drm_device *ddev)
1142 {
1143 struct ltdc_device *ldev = ddev->dev_private;
1144
1145 DRM_DEBUG_DRIVER("\n");
1146
1147 if (ldev->panel)
1148 drm_panel_detach(ldev->panel);
1149
1150 clk_disable_unprepare(ldev->pixel_clk);
1151 }
1152
1153 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
1154 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
1155 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
1156 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
1157 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
1158 MODULE_LICENSE("GPL v2");
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