linux-kernel - [PATCH v2 0/4] Add support for fetching EDID from ACPI

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240130192608.11666-1-mario.limonciello@amd.com>
Date: Tue, 30 Jan 2024 13:26:04 -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 v2 0/4] 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/

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