drm/amd/display: Bump the HDMI clock to 340MHz

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commit fee5007765 upstream.

[Why]
DP-HDMI dongles can execeed bandwidth requirements on high resolution
monitors. This can lead to pruning the high resolution modes.

HDMI 1.3 bumped the clock to 340MHz, but display code never matched it.

[How]
Set default to (DVI) 165MHz.  Once HDMI display is identified update
to 340MHz.

Reported-by: Dianne Skoll <dianne@skoll.ca>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4780
Reviewed-by: Chris Park <chris.park@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ac1e65d8ad)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Mario Limonciello 2025-12-15 14:08:30 -06:00 • committed by Greg Kroah-Hartman

parent df7a49b328

commit ae5b1d291c

2 changed files with 4 additions and 2 deletions

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2

drivers/gpu/drm/amd/display/dc/dc_hdmi_types.h

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4

drivers/gpu/drm/amd/display/dc/link/link_detection.c

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