xref: /openbmc/linux/include/drm/drm_edid.h (revision 2f828fb2)
1 /*
2  * Copyright © 2007-2008 Intel Corporation
3  *   Jesse Barnes <jesse.barnes@intel.com>
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included in
13  * all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21  * OTHER DEALINGS IN THE SOFTWARE.
22  */
23 #ifndef __DRM_EDID_H__
24 #define __DRM_EDID_H__
25 
26 #include <linux/types.h>
27 #include <linux/hdmi.h>
28 
29 struct drm_device;
30 struct i2c_adapter;
31 
32 #define EDID_LENGTH 128
33 #define DDC_ADDR 0x50
34 #define DDC_ADDR2 0x52 /* E-DDC 1.2 - where DisplayID can hide */
35 
36 #define CEA_EXT	    0x02
37 #define VTB_EXT	    0x10
38 #define DI_EXT	    0x40
39 #define LS_EXT	    0x50
40 #define MI_EXT	    0x60
41 #define DISPLAYID_EXT 0x70
42 
43 struct est_timings {
44 	u8 t1;
45 	u8 t2;
46 	u8 mfg_rsvd;
47 } __attribute__((packed));
48 
49 /* 00=16:10, 01=4:3, 10=5:4, 11=16:9 */
50 #define EDID_TIMING_ASPECT_SHIFT 6
51 #define EDID_TIMING_ASPECT_MASK  (0x3 << EDID_TIMING_ASPECT_SHIFT)
52 
53 /* need to add 60 */
54 #define EDID_TIMING_VFREQ_SHIFT  0
55 #define EDID_TIMING_VFREQ_MASK   (0x3f << EDID_TIMING_VFREQ_SHIFT)
56 
57 struct std_timing {
58 	u8 hsize; /* need to multiply by 8 then add 248 */
59 	u8 vfreq_aspect;
60 } __attribute__((packed));
61 
62 #define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1)
63 #define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2)
64 #define DRM_EDID_PT_SEPARATE_SYNC  (3 << 3)
65 #define DRM_EDID_PT_STEREO         (1 << 5)
66 #define DRM_EDID_PT_INTERLACED     (1 << 7)
67 
68 /* If detailed data is pixel timing */
69 struct detailed_pixel_timing {
70 	u8 hactive_lo;
71 	u8 hblank_lo;
72 	u8 hactive_hblank_hi;
73 	u8 vactive_lo;
74 	u8 vblank_lo;
75 	u8 vactive_vblank_hi;
76 	u8 hsync_offset_lo;
77 	u8 hsync_pulse_width_lo;
78 	u8 vsync_offset_pulse_width_lo;
79 	u8 hsync_vsync_offset_pulse_width_hi;
80 	u8 width_mm_lo;
81 	u8 height_mm_lo;
82 	u8 width_height_mm_hi;
83 	u8 hborder;
84 	u8 vborder;
85 	u8 misc;
86 } __attribute__((packed));
87 
88 /* If it's not pixel timing, it'll be one of the below */
89 struct detailed_data_string {
90 	u8 str[13];
91 } __attribute__((packed));
92 
93 struct detailed_data_monitor_range {
94 	u8 min_vfreq;
95 	u8 max_vfreq;
96 	u8 min_hfreq_khz;
97 	u8 max_hfreq_khz;
98 	u8 pixel_clock_mhz; /* need to multiply by 10 */
99 	u8 flags;
100 	union {
101 		struct {
102 			u8 reserved;
103 			u8 hfreq_start_khz; /* need to multiply by 2 */
104 			u8 c; /* need to divide by 2 */
105 			__le16 m;
106 			u8 k;
107 			u8 j; /* need to divide by 2 */
108 		} __attribute__((packed)) gtf2;
109 		struct {
110 			u8 version;
111 			u8 data1; /* high 6 bits: extra clock resolution */
112 			u8 data2; /* plus low 2 of above: max hactive */
113 			u8 supported_aspects;
114 			u8 flags; /* preferred aspect and blanking support */
115 			u8 supported_scalings;
116 			u8 preferred_refresh;
117 		} __attribute__((packed)) cvt;
118 	} formula;
119 } __attribute__((packed));
120 
121 struct detailed_data_wpindex {
122 	u8 white_yx_lo; /* Lower 2 bits each */
123 	u8 white_x_hi;
124 	u8 white_y_hi;
125 	u8 gamma; /* need to divide by 100 then add 1 */
126 } __attribute__((packed));
127 
128 struct detailed_data_color_point {
129 	u8 windex1;
130 	u8 wpindex1[3];
131 	u8 windex2;
132 	u8 wpindex2[3];
133 } __attribute__((packed));
134 
135 struct cvt_timing {
136 	u8 code[3];
137 } __attribute__((packed));
138 
139 struct detailed_non_pixel {
140 	u8 pad1;
141 	u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
142 		    fb=color point data, fa=standard timing data,
143 		    f9=undefined, f8=mfg. reserved */
144 	u8 pad2;
145 	union {
146 		struct detailed_data_string str;
147 		struct detailed_data_monitor_range range;
148 		struct detailed_data_wpindex color;
149 		struct std_timing timings[6];
150 		struct cvt_timing cvt[4];
151 	} data;
152 } __attribute__((packed));
153 
154 #define EDID_DETAIL_EST_TIMINGS 0xf7
155 #define EDID_DETAIL_CVT_3BYTE 0xf8
156 #define EDID_DETAIL_COLOR_MGMT_DATA 0xf9
157 #define EDID_DETAIL_STD_MODES 0xfa
158 #define EDID_DETAIL_MONITOR_CPDATA 0xfb
159 #define EDID_DETAIL_MONITOR_NAME 0xfc
160 #define EDID_DETAIL_MONITOR_RANGE 0xfd
161 #define EDID_DETAIL_MONITOR_STRING 0xfe
162 #define EDID_DETAIL_MONITOR_SERIAL 0xff
163 
164 struct detailed_timing {
165 	__le16 pixel_clock; /* need to multiply by 10 KHz */
166 	union {
167 		struct detailed_pixel_timing pixel_data;
168 		struct detailed_non_pixel other_data;
169 	} data;
170 } __attribute__((packed));
171 
172 #define DRM_EDID_INPUT_SERRATION_VSYNC (1 << 0)
173 #define DRM_EDID_INPUT_SYNC_ON_GREEN   (1 << 1)
174 #define DRM_EDID_INPUT_COMPOSITE_SYNC  (1 << 2)
175 #define DRM_EDID_INPUT_SEPARATE_SYNCS  (1 << 3)
176 #define DRM_EDID_INPUT_BLANK_TO_BLACK  (1 << 4)
177 #define DRM_EDID_INPUT_VIDEO_LEVEL     (3 << 5)
178 #define DRM_EDID_INPUT_DIGITAL         (1 << 7)
179 #define DRM_EDID_DIGITAL_DEPTH_MASK    (7 << 4)
180 #define DRM_EDID_DIGITAL_DEPTH_UNDEF   (0 << 4)
181 #define DRM_EDID_DIGITAL_DEPTH_6       (1 << 4)
182 #define DRM_EDID_DIGITAL_DEPTH_8       (2 << 4)
183 #define DRM_EDID_DIGITAL_DEPTH_10      (3 << 4)
184 #define DRM_EDID_DIGITAL_DEPTH_12      (4 << 4)
185 #define DRM_EDID_DIGITAL_DEPTH_14      (5 << 4)
186 #define DRM_EDID_DIGITAL_DEPTH_16      (6 << 4)
187 #define DRM_EDID_DIGITAL_DEPTH_RSVD    (7 << 4)
188 #define DRM_EDID_DIGITAL_TYPE_UNDEF    (0)
189 #define DRM_EDID_DIGITAL_TYPE_DVI      (1)
190 #define DRM_EDID_DIGITAL_TYPE_HDMI_A   (2)
191 #define DRM_EDID_DIGITAL_TYPE_HDMI_B   (3)
192 #define DRM_EDID_DIGITAL_TYPE_MDDI     (4)
193 #define DRM_EDID_DIGITAL_TYPE_DP       (5)
194 
195 #define DRM_EDID_FEATURE_DEFAULT_GTF      (1 << 0)
196 #define DRM_EDID_FEATURE_PREFERRED_TIMING (1 << 1)
197 #define DRM_EDID_FEATURE_STANDARD_COLOR   (1 << 2)
198 /* If analog */
199 #define DRM_EDID_FEATURE_DISPLAY_TYPE     (3 << 3) /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
200 /* If digital */
201 #define DRM_EDID_FEATURE_COLOR_MASK	  (3 << 3)
202 #define DRM_EDID_FEATURE_RGB		  (0 << 3)
203 #define DRM_EDID_FEATURE_RGB_YCRCB444	  (1 << 3)
204 #define DRM_EDID_FEATURE_RGB_YCRCB422	  (2 << 3)
205 #define DRM_EDID_FEATURE_RGB_YCRCB	  (3 << 3) /* both 4:4:4 and 4:2:2 */
206 
207 #define DRM_EDID_FEATURE_PM_ACTIVE_OFF    (1 << 5)
208 #define DRM_EDID_FEATURE_PM_SUSPEND       (1 << 6)
209 #define DRM_EDID_FEATURE_PM_STANDBY       (1 << 7)
210 
211 #define DRM_EDID_HDMI_DC_48               (1 << 6)
212 #define DRM_EDID_HDMI_DC_36               (1 << 5)
213 #define DRM_EDID_HDMI_DC_30               (1 << 4)
214 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
215 
216 /* YCBCR 420 deep color modes */
217 #define DRM_EDID_YCBCR420_DC_48		  (1 << 6)
218 #define DRM_EDID_YCBCR420_DC_36		  (1 << 5)
219 #define DRM_EDID_YCBCR420_DC_30		  (1 << 4)
220 #define DRM_EDID_YCBCR420_DC_MASK (DRM_EDID_YCBCR420_DC_48 | \
221 				    DRM_EDID_YCBCR420_DC_36 | \
222 				    DRM_EDID_YCBCR420_DC_30)
223 
224 /* ELD Header Block */
225 #define DRM_ELD_HEADER_BLOCK_SIZE	4
226 
227 #define DRM_ELD_VER			0
228 # define DRM_ELD_VER_SHIFT		3
229 # define DRM_ELD_VER_MASK		(0x1f << 3)
230 # define DRM_ELD_VER_CEA861D		(2 << 3) /* supports 861D or below */
231 # define DRM_ELD_VER_CANNED		(0x1f << 3)
232 
233 #define DRM_ELD_BASELINE_ELD_LEN	2	/* in dwords! */
234 
235 /* ELD Baseline Block for ELD_Ver == 2 */
236 #define DRM_ELD_CEA_EDID_VER_MNL	4
237 # define DRM_ELD_CEA_EDID_VER_SHIFT	5
238 # define DRM_ELD_CEA_EDID_VER_MASK	(7 << 5)
239 # define DRM_ELD_CEA_EDID_VER_NONE	(0 << 5)
240 # define DRM_ELD_CEA_EDID_VER_CEA861	(1 << 5)
241 # define DRM_ELD_CEA_EDID_VER_CEA861A	(2 << 5)
242 # define DRM_ELD_CEA_EDID_VER_CEA861BCD	(3 << 5)
243 # define DRM_ELD_MNL_SHIFT		0
244 # define DRM_ELD_MNL_MASK		(0x1f << 0)
245 
246 #define DRM_ELD_SAD_COUNT_CONN_TYPE	5
247 # define DRM_ELD_SAD_COUNT_SHIFT	4
248 # define DRM_ELD_SAD_COUNT_MASK		(0xf << 4)
249 # define DRM_ELD_CONN_TYPE_SHIFT	2
250 # define DRM_ELD_CONN_TYPE_MASK		(3 << 2)
251 # define DRM_ELD_CONN_TYPE_HDMI		(0 << 2)
252 # define DRM_ELD_CONN_TYPE_DP		(1 << 2)
253 # define DRM_ELD_SUPPORTS_AI		(1 << 1)
254 # define DRM_ELD_SUPPORTS_HDCP		(1 << 0)
255 
256 #define DRM_ELD_AUD_SYNCH_DELAY		6	/* in units of 2 ms */
257 # define DRM_ELD_AUD_SYNCH_DELAY_MAX	0xfa	/* 500 ms */
258 
259 #define DRM_ELD_SPEAKER			7
260 # define DRM_ELD_SPEAKER_MASK		0x7f
261 # define DRM_ELD_SPEAKER_RLRC		(1 << 6)
262 # define DRM_ELD_SPEAKER_FLRC		(1 << 5)
263 # define DRM_ELD_SPEAKER_RC		(1 << 4)
264 # define DRM_ELD_SPEAKER_RLR		(1 << 3)
265 # define DRM_ELD_SPEAKER_FC		(1 << 2)
266 # define DRM_ELD_SPEAKER_LFE		(1 << 1)
267 # define DRM_ELD_SPEAKER_FLR		(1 << 0)
268 
269 #define DRM_ELD_PORT_ID			8	/* offsets 8..15 inclusive */
270 # define DRM_ELD_PORT_ID_LEN		8
271 
272 #define DRM_ELD_MANUFACTURER_NAME0	16
273 #define DRM_ELD_MANUFACTURER_NAME1	17
274 
275 #define DRM_ELD_PRODUCT_CODE0		18
276 #define DRM_ELD_PRODUCT_CODE1		19
277 
278 #define DRM_ELD_MONITOR_NAME_STRING	20	/* offsets 20..(20+mnl-1) inclusive */
279 
280 #define DRM_ELD_CEA_SAD(mnl, sad)	(20 + (mnl) + 3 * (sad))
281 
282 struct edid {
283 	u8 header[8];
284 	/* Vendor & product info */
285 	u8 mfg_id[2];
286 	u8 prod_code[2];
287 	u32 serial; /* FIXME: byte order */
288 	u8 mfg_week;
289 	u8 mfg_year;
290 	/* EDID version */
291 	u8 version;
292 	u8 revision;
293 	/* Display info: */
294 	u8 input;
295 	u8 width_cm;
296 	u8 height_cm;
297 	u8 gamma;
298 	u8 features;
299 	/* Color characteristics */
300 	u8 red_green_lo;
301 	u8 black_white_lo;
302 	u8 red_x;
303 	u8 red_y;
304 	u8 green_x;
305 	u8 green_y;
306 	u8 blue_x;
307 	u8 blue_y;
308 	u8 white_x;
309 	u8 white_y;
310 	/* Est. timings and mfg rsvd timings*/
311 	struct est_timings established_timings;
312 	/* Standard timings 1-8*/
313 	struct std_timing standard_timings[8];
314 	/* Detailing timings 1-4 */
315 	struct detailed_timing detailed_timings[4];
316 	/* Number of 128 byte ext. blocks */
317 	u8 extensions;
318 	/* Checksum */
319 	u8 checksum;
320 } __attribute__((packed));
321 
322 #define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))
323 
324 /* Short Audio Descriptor */
325 struct cea_sad {
326 	u8 format;
327 	u8 channels; /* max number of channels - 1 */
328 	u8 freq;
329 	u8 byte2; /* meaning depends on format */
330 };
331 
332 struct drm_encoder;
333 struct drm_connector;
334 struct drm_display_mode;
335 
336 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
337 int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
338 int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb);
339 int drm_av_sync_delay(struct drm_connector *connector,
340 		      const struct drm_display_mode *mode);
341 
342 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
343 struct edid *drm_load_edid_firmware(struct drm_connector *connector);
344 int __drm_set_edid_firmware_path(const char *path);
345 int __drm_get_edid_firmware_path(char *buf, size_t bufsize);
346 #else
347 static inline struct edid *
348 drm_load_edid_firmware(struct drm_connector *connector)
349 {
350 	return ERR_PTR(-ENOENT);
351 }
352 #endif
353 
354 int
355 drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
356 					 const struct drm_display_mode *mode,
357 					 bool is_hdmi2_sink);
358 int
359 drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
360 					    const struct drm_display_mode *mode);
361 void
362 drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
363 				   const struct drm_display_mode *mode,
364 				   enum hdmi_quantization_range rgb_quant_range,
365 				   bool rgb_quant_range_selectable);
366 
367 /**
368  * drm_eld_mnl - Get ELD monitor name length in bytes.
369  * @eld: pointer to an eld memory structure with mnl set
370  */
371 static inline int drm_eld_mnl(const uint8_t *eld)
372 {
373 	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
374 }
375 
376 /**
377  * drm_eld_sad - Get ELD SAD structures.
378  * @eld: pointer to an eld memory structure with sad_count set
379  */
380 static inline const uint8_t *drm_eld_sad(const uint8_t *eld)
381 {
382 	unsigned int ver, mnl;
383 
384 	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
385 	if (ver != 2 && ver != 31)
386 		return NULL;
387 
388 	mnl = drm_eld_mnl(eld);
389 	if (mnl > 16)
390 		return NULL;
391 
392 	return eld + DRM_ELD_CEA_SAD(mnl, 0);
393 }
394 
395 /**
396  * drm_eld_sad_count - Get ELD SAD count.
397  * @eld: pointer to an eld memory structure with sad_count set
398  */
399 static inline int drm_eld_sad_count(const uint8_t *eld)
400 {
401 	return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>
402 		DRM_ELD_SAD_COUNT_SHIFT;
403 }
404 
405 /**
406  * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes
407  * @eld: pointer to an eld memory structure with mnl and sad_count set
408  *
409  * This is a helper for determining the payload size of the baseline block, in
410  * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.
411  */
412 static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)
413 {
414 	return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +
415 		drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;
416 }
417 
418 /**
419  * drm_eld_size - Get ELD size in bytes
420  * @eld: pointer to a complete eld memory structure
421  *
422  * The returned value does not include the vendor block. It's vendor specific,
423  * and comprises of the remaining bytes in the ELD memory buffer after
424  * drm_eld_size() bytes of header and baseline block.
425  *
426  * The returned value is guaranteed to be a multiple of 4.
427  */
428 static inline int drm_eld_size(const uint8_t *eld)
429 {
430 	return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;
431 }
432 
433 /**
434  * drm_eld_get_spk_alloc - Get speaker allocation
435  * @eld: pointer to an ELD memory structure
436  *
437  * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER
438  * field definitions to identify speakers.
439  */
440 static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld)
441 {
442 	return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK;
443 }
444 
445 /**
446  * drm_eld_get_conn_type - Get device type hdmi/dp connected
447  * @eld: pointer to an ELD memory structure
448  *
449  * The caller need to use %DRM_ELD_CONN_TYPE_HDMI or %DRM_ELD_CONN_TYPE_DP to
450  * identify the display type connected.
451  */
452 static inline u8 drm_eld_get_conn_type(const uint8_t *eld)
453 {
454 	return eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_CONN_TYPE_MASK;
455 }
456 
457 bool drm_probe_ddc(struct i2c_adapter *adapter);
458 struct edid *drm_do_get_edid(struct drm_connector *connector,
459 	int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
460 			      size_t len),
461 	void *data);
462 struct edid *drm_get_edid(struct drm_connector *connector,
463 			  struct i2c_adapter *adapter);
464 struct edid *drm_get_edid_switcheroo(struct drm_connector *connector,
465 				     struct i2c_adapter *adapter);
466 struct edid *drm_edid_duplicate(const struct edid *edid);
467 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
468 
469 u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
470 enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
471 bool drm_detect_hdmi_monitor(struct edid *edid);
472 bool drm_detect_monitor_audio(struct edid *edid);
473 bool drm_rgb_quant_range_selectable(struct edid *edid);
474 enum hdmi_quantization_range
475 drm_default_rgb_quant_range(const struct drm_display_mode *mode);
476 int drm_add_modes_noedid(struct drm_connector *connector,
477 			 int hdisplay, int vdisplay);
478 void drm_set_preferred_mode(struct drm_connector *connector,
479 			    int hpref, int vpref);
480 
481 int drm_edid_header_is_valid(const u8 *raw_edid);
482 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
483 			  bool *edid_corrupt);
484 bool drm_edid_is_valid(struct edid *edid);
485 void drm_edid_get_monitor_name(struct edid *edid, char *name,
486 			       int buflen);
487 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
488 					   int hsize, int vsize, int fresh,
489 					   bool rb);
490 #endif /* __DRM_EDID_H__ */
491