linux-kernel - [PATCH v3 0/5] Add support for fetching EDID from ACPI

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Date: Thu, 1 Feb 2024 16:11:14 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: <amd-gfx@...ts.freedesktop.org>, Alex Deucher <alexander.deucher@....com>,
	Harry Wentland <harry.wentland@....com>, "Rafael J . Wysocki"
	<rafael@...nel.org>, Hans de Goede <hdegoede@...hat.com>
CC: "open list:ACPI" <linux-acpi@...r.kernel.org>, open list
	<linux-kernel@...r.kernel.org>, "open list:DRM DRIVERS"
	<dri-devel@...ts.freedesktop.org>, Melissa Wen <mwen@...lia.com>, "Mark
 Pearson" <mpearson-lenovo@...ebb.ca>, Mario Limonciello
	<mario.limonciello@....com>
Subject: [PATCH v3 0/5] Add support for fetching EDID from ACPI _DDC

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-mwen@igalia.com/

v2-v3:
 * Clean up some of the 'select ACPI_VIDEO' kconfig spaghetti reported by LKP
 * Drop the 'select ACPI_VIDEO' from the DRM drivers

Mario Limonciello (5):
  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
  drm: Drop unneeded selects in DRM drivers

 drivers/acpi/acpi_video.c                     | 25 +++----
 drivers/gpu/drm/Kconfig                       |  5 ++
 drivers/gpu/drm/amd/amdgpu/Kconfig            |  7 --
 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/gma500/Kconfig                |  6 --
 drivers/gpu/drm/i915/Kconfig                  |  7 --
 drivers/gpu/drm/nouveau/nouveau_acpi.c        | 27 -------
 drivers/gpu/drm/nouveau/nouveau_acpi.h        |  2 -
 drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
 drivers/gpu/drm/radeon/Kconfig                |  7 --
 drivers/gpu/drm/xe/Kconfig                    |  6 --
 include/drm/drm_edid.h                        |  1 +
 17 files changed, 116 insertions(+), 84 deletions(-)

-- 
2.34.1