drm/amd/display: Read LTTPR ALPM caps during link cap retrieval

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[Why]
The latest DP spec requires the DP TX to read DPCD F0000h through F0009h
when detecting LTTPR capabilities for the first time.

[How]
Update LTTPR cap retrieval to read up to F0009h (two more bytes than the
previous F0007h), and store the LTTPR ALPM capabilities.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

George Shen 2025-02-04 14:34:02 -05:00 • committed by Alex Deucher

parent 5f7e384ab5

commit de84d58012

2 changed files with 17 additions and 1 deletions

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12

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

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6

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

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