drm/amd/display: Send DP_TOTAL_LTTPR_CNT during detection if LTTPR is present

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[WHY]
New register field added in DP2.1 SCR, needed for auxless ALPM

[HOW]
Echo value read from 0xF0007 back to sink

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Michael Strauss 2023-11-28 10:31:12 -05:00 • committed by Alex Deucher

parent ee8287e068

commit d03415f60b

2 changed files with 14 additions and 1 deletions

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10

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

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5

drivers/gpu/drm/amd/display/include/dpcd_defs.h

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