drm/amd/display: determine rx id list bytes to read based on device count

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[why]
Some RX doesn't like us to read rx id list upto max rx id list size.  As
discussed, we decided to read rx id list based on device count.

[how]
According to HDCP specs the actual size of rx id list is calculated as
rx id list size = 2+3+16+5*device_count.  We will read 16 bytes at a
time until it reached or exceeded rx id list size.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Ashley Thomas <Ashley.Thomas2@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Wenjing Liu 2020-02-25 16:37:32 -05:00 • committed by Alex Deucher

parent 8cc426d79b

commit d7ecf5e37d

1 changed files with 20 additions and 4 deletions

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drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c

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