Some laptops ship an EDID in the BIOS encoded in the _DDC method that differs than the EDID directly on the laptop panel for $REASONS.
This is the EDID that is used by the AMD Windows driver, and so sometimes different results are found in different operating systems. This series adds a new DRM helper that will use acpi_video to fetch the EDID. On amdgpu when an eDP panel is found the BIOS is checked first for an EDID and that used as a preference if found. On nouveau it replaces the previous local function doing a similar role. This does *not* use struct drm_edid as this will require more involved amdgpu display driver work that will come separately as part of follow-ups to: https://lore.kernel.org/amd-gfx/20240126163429.56714-1-m...@igalia.com/ Mario Limonciello (4): ACPI: video: Handle fetching EDID that is longer than 256 bytes drm: Add drm_get_acpi_edid() helper drm/amd: Fetch the EDID from _DDC if available for eDP drm/nouveau: Use drm_get_acpi_edid() helper drivers/acpi/acpi_video.c | 25 +++---- drivers/gpu/drm/Kconfig | 4 + drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + .../gpu/drm/amd/amdgpu/amdgpu_connectors.c | 4 + drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 8 ++ .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ++- .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 9 ++- drivers/gpu/drm/drm_edid.c | 73 +++++++++++++++++++ drivers/gpu/drm/nouveau/nouveau_acpi.c | 27 ------- drivers/gpu/drm/nouveau/nouveau_acpi.h | 2 - drivers/gpu/drm/nouveau/nouveau_connector.c | 2 +- include/drm/drm_edid.h | 1 + 12 files changed, 115 insertions(+), 51 deletions(-) -- 2.34.1
