kernel/linux.git/drivers/gpu/drm/drm_displayid.c, branch v6.12.80

drm/displayid: add quirk to ignore DisplayID checksum errors

2026-01-08T09:14:58+00:00

[ Upstream commit 83cbb4d33dc22b0ca1a4e85c6e892c9b729e28d4 ] Add a mechanism for DisplayID specific quirks, and add the first quirk to ignore DisplayID section checksum errors. It would be quite inconvenient to pass existing EDID quirks from drm_edid.c for DisplayID parsing. Not all places doing DisplayID iteration have the quirks readily available, and would have to pass it in all places. Simply add a separate array of DisplayID specific EDID quirks. We do end up checking it every time we iterate DisplayID blocks, but hopefully the number of quirks remains small. There are a few laptop models with DisplayID checksum failures, leading to higher refresh rates only present in the DisplayID blocks being ignored. Add a quirk for the panel in the machines. Reported-by: Tiago Martins Araújo Closes: https://lore.kernel.org/r/CACRbrPGvLP5LANXuFi6z0S7XMbAG4X5y2YOLBDxfOVtfGGqiKQ@mail.gmail.com Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14703 Acked-by: Alex Deucher Tested-by: Tiago Martins Araújo Cc: stable@vger.kernel.org Link: https://patch.msgid.link/c04d81ae648c5f21b3f5b7953f924718051f2798.1761681968.git.jani.nikula@intel.com Signed-off-by: Jani Nikula Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/displayid: pass iter to drm_find_displayid_extension()

2026-01-08T09:14:26+00:00

commit 520f37c30992fd0c212a34fbe99c062b7a3dc52e upstream. It's more convenient to pass iter than a handful of its members to drm_find_displayid_extension(), especially as we're about to add another member. Rename the function find_next_displayid_extension() while at it, to be more descriptive. Cc: Tiago Martins Araújo Acked-by: Alex Deucher Tested-by: Tiago Martins Araújo Cc: stable@vger.kernel.org Link: https://patch.msgid.link/3837ae7f095e77a082ac2422ce2fac96c4f9373d.1761681968.git.jani.nikula@intel.com Signed-off-by: Jani Nikula Signed-off-by: Greg Kroah-Hartman

drm/edid: reduce DisplayID log spamming

2024-08-14T07:19:09+00:00

Debug printing at DisplayID validation leads to lots of log spamming as it's called at DisplayID iterators during EDID parsing. Remove it, and replace with a less noisy message at connector EDID update. Acked-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20240606123503.2825088-1-jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/edid: rename drm_find_edid_extension() to drm_edid_find_extension()

2024-04-17T13:11:28+00:00

Follow the drm_edid_ naming convention. Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/b7a2c2509409de02bbd751541206586424a34725.1713259151.git.jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/edid: move all internal declarations to drm_crtc_internal.h

2024-04-17T13:11:17+00:00

The declarations for internal EDID functions are a bit scattered. Put them all in drm_crtc_internal.h. Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/9ae137ea51f9cc2ccb3899b0acda553e6a8ce2db.1713259151.git.jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/displayid: move drm_displayid.h to drm_displayd_internal.h

2024-04-17T13:11:10+00:00

There are no exported symbols for displayid, and it's all internal interfaces. Move the header to drivers/gpu/drm/drm_displayd_internal.h. Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/220713d4e3cc364ac103ba689065ae96e075f1fa.1713259151.git.jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/displayid: provide access to DisplayID version and primary use case

2023-02-26T23:58:38+00:00

The DisplayID structure version and primary use case are stored in the DisplayID Base Section. We should be checking them in a number of places when parsing the DisplayID blocks. Currently, we completely ignore the primary use case, and just look at the block tags without cross-checking against structure version. Store the version and primary use case in the DisplayID iterator, and provide accessors to them. In general, the information is needed when iterating the blocks, and this is a convenient place to both store and retrieve the information during parsing. Promote using accessors rather than users poking at the iterator directly. Cc: Iaroslav Boliukin Cc: Dmitry Osipenko Signed-off-by: Jani Nikula Tested-by: Dmitry Osipenko Reviewed-by: Dmitry Osipenko Signed-off-by: Dmitry Osipenko Link: https://patchwork.freedesktop.org/patch/msgid/ad8a35c109f97ffe115e6b18e4a132b592f11089.1676580180.git.jani.nikula@intel.com

drm/displayid: return struct displayid_header from validate_displayid()

2023-02-26T23:58:38+00:00

Avoid figuring out the header pointer multiple times. Cc: Iaroslav Boliukin Cc: Dmitry Osipenko Signed-off-by: Jani Nikula Tested-by: Dmitry Osipenko Reviewed-by: Dmitry Osipenko Signed-off-by: Dmitry Osipenko Link: https://patchwork.freedesktop.org/patch/msgid/e840c744d165608a41db5a5e2bd4b0205783c697.1676580180.git.jani.nikula@intel.com

drm/displayid: add displayid_get_header() and check bounds better

2023-02-26T23:58:37+00:00

Add a helper to get a pointer to struct displayid_header. To be pedantic, add buffer overflow checks to not touch the base if that itself would overflow. Cc: Iaroslav Boliukin Cc: Dmitry Osipenko Signed-off-by: Jani Nikula Tested-by: Dmitry Osipenko Reviewed-by: Dmitry Osipenko Signed-off-by: Dmitry Osipenko Link: https://patchwork.freedesktop.org/patch/msgid/4a03b3a5132642d3cdb6d4c2641422955a917292.1676580180.git.jani.nikula@intel.com

drm/displayid: convert to drm_edid

2022-05-13T15:55:13+00:00

We'll need to propagate drm_edid everywhere. v2: Rebase Signed-off-by: Jani Nikula Reviewed-by: Ankit Nautiyal Link: https://patchwork.freedesktop.org/patch/msgid/a52a6882e87a4bb6b1670918f3aba13f9b52f6de.1652097712.git.jani.nikula@intel.com