forked from mirrors/linux
18a9cbbe55
The VESA Organization Vendor-Specific Data Block, defined in VESA DisplayID Standard v2.0, specifies the eDP Multi-SST Operation (MSO) stream count and segment pixel overlap. DisplayID v1.3 has Appendix B: DisplayID as an EDID Extension, describing how DisplayID sections may be embedded in EDID extension blocks. DisplayID v2.0 does not have such a section, perhaps implying that DisplayID v2.0 data should not be included in EDID extensions, but rather in a "pure" DisplayID structure at its own DDC address pair A4h/A5h, as described in VESA E-DDC Standard v1.3 chapter 3. However, in practice, displays out in the field have embedded DisplayID v2.0 data blocks in EDID extensions, including, in particular, some eDP MSO displays, where a pure DisplayID structure is not available at all. Parse the MSO data from the DisplayID data block. Do it as part of drm_add_display_info(), extending it to parse also DisplayID data to avoid requiring extra calls to update the information. v2: Check for VESA OUI (Ville) Reviewed-by: Uma Shankar <uma.shankar@intel.com> Acked-by: Maxime Ripard <maxime@cerno.tech> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/73ca2887e7b37880690f5c9ba4594c9cd1170669.1630419362.git.jani.nikula@intel.com
160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
/*
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* Copyright © 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef DRM_DISPLAYID_H
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#define DRM_DISPLAYID_H
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#include <linux/types.h>
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#include <linux/bits.h>
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struct edid;
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#define VESA_IEEE_OUI 0x3a0292
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/* DisplayID Structure versions */
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#define DISPLAY_ID_STRUCTURE_VER_12 0x12
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#define DISPLAY_ID_STRUCTURE_VER_20 0x20
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/* DisplayID Structure v1r2 Data Blocks */
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#define DATA_BLOCK_PRODUCT_ID 0x00
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#define DATA_BLOCK_DISPLAY_PARAMETERS 0x01
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#define DATA_BLOCK_COLOR_CHARACTERISTICS 0x02
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#define DATA_BLOCK_TYPE_1_DETAILED_TIMING 0x03
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#define DATA_BLOCK_TYPE_2_DETAILED_TIMING 0x04
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#define DATA_BLOCK_TYPE_3_SHORT_TIMING 0x05
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#define DATA_BLOCK_TYPE_4_DMT_TIMING 0x06
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#define DATA_BLOCK_VESA_TIMING 0x07
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#define DATA_BLOCK_CEA_TIMING 0x08
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#define DATA_BLOCK_VIDEO_TIMING_RANGE 0x09
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#define DATA_BLOCK_PRODUCT_SERIAL_NUMBER 0x0a
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#define DATA_BLOCK_GP_ASCII_STRING 0x0b
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#define DATA_BLOCK_DISPLAY_DEVICE_DATA 0x0c
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#define DATA_BLOCK_INTERFACE_POWER_SEQUENCING 0x0d
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#define DATA_BLOCK_TRANSFER_CHARACTERISTICS 0x0e
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#define DATA_BLOCK_DISPLAY_INTERFACE 0x0f
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#define DATA_BLOCK_STEREO_DISPLAY_INTERFACE 0x10
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#define DATA_BLOCK_TILED_DISPLAY 0x12
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#define DATA_BLOCK_VENDOR_SPECIFIC 0x7f
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#define DATA_BLOCK_CTA 0x81
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/* DisplayID Structure v2r0 Data Blocks */
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#define DATA_BLOCK_2_PRODUCT_ID 0x20
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#define DATA_BLOCK_2_DISPLAY_PARAMETERS 0x21
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#define DATA_BLOCK_2_TYPE_7_DETAILED_TIMING 0x22
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#define DATA_BLOCK_2_TYPE_8_ENUMERATED_TIMING 0x23
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#define DATA_BLOCK_2_TYPE_9_FORMULA_TIMING 0x24
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#define DATA_BLOCK_2_DYNAMIC_VIDEO_TIMING 0x25
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#define DATA_BLOCK_2_DISPLAY_INTERFACE_FEATURES 0x26
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#define DATA_BLOCK_2_STEREO_DISPLAY_INTERFACE 0x27
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#define DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY 0x28
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#define DATA_BLOCK_2_CONTAINER_ID 0x29
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#define DATA_BLOCK_2_VENDOR_SPECIFIC 0x7e
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#define DATA_BLOCK_2_CTA_DISPLAY_ID 0x81
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/* DisplayID Structure v1r2 Product Type */
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#define PRODUCT_TYPE_EXTENSION 0
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#define PRODUCT_TYPE_TEST 1
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#define PRODUCT_TYPE_PANEL 2
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#define PRODUCT_TYPE_MONITOR 3
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#define PRODUCT_TYPE_TV 4
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#define PRODUCT_TYPE_REPEATER 5
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#define PRODUCT_TYPE_DIRECT_DRIVE 6
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/* DisplayID Structure v2r0 Display Product Primary Use Case (~Product Type) */
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#define PRIMARY_USE_EXTENSION 0
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#define PRIMARY_USE_TEST 1
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#define PRIMARY_USE_GENERIC 2
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#define PRIMARY_USE_TV 3
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#define PRIMARY_USE_DESKTOP_PRODUCTIVITY 4
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#define PRIMARY_USE_DESKTOP_GAMING 5
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#define PRIMARY_USE_PRESENTATION 6
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#define PRIMARY_USE_HEAD_MOUNTED_VR 7
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#define PRIMARY_USE_HEAD_MOUNTED_AR 8
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struct displayid_header {
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u8 rev;
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u8 bytes;
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u8 prod_id;
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u8 ext_count;
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} __packed;
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struct displayid_block {
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u8 tag;
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u8 rev;
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u8 num_bytes;
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} __packed;
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struct displayid_tiled_block {
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struct displayid_block base;
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u8 tile_cap;
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u8 topo[3];
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u8 tile_size[4];
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u8 tile_pixel_bezel[5];
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u8 topology_id[8];
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} __packed;
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struct displayid_detailed_timings_1 {
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u8 pixel_clock[3];
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u8 flags;
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u8 hactive[2];
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u8 hblank[2];
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u8 hsync[2];
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u8 hsw[2];
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u8 vactive[2];
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u8 vblank[2];
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u8 vsync[2];
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u8 vsw[2];
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} __packed;
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struct displayid_detailed_timing_block {
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struct displayid_block base;
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struct displayid_detailed_timings_1 timings[];
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};
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#define DISPLAYID_VESA_MSO_OVERLAP GENMASK(3, 0)
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#define DISPLAYID_VESA_MSO_MODE GENMASK(6, 5)
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struct displayid_vesa_vendor_specific_block {
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struct displayid_block base;
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u8 oui[3];
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u8 data_structure_type;
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u8 mso;
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} __packed;
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/* DisplayID iteration */
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struct displayid_iter {
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const struct edid *edid;
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const u8 *section;
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int length;
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int idx;
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int ext_index;
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};
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void displayid_iter_edid_begin(const struct edid *edid,
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struct displayid_iter *iter);
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const struct displayid_block *
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__displayid_iter_next(struct displayid_iter *iter);
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#define displayid_iter_for_each(__block, __iter) \
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while (((__block) = __displayid_iter_next(__iter)))
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void displayid_iter_end(struct displayid_iter *iter);
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#endif
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