drm/amd/display: Passive DP->HDMI dongle detection fix

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[WHY]
i2c_read is called to differentiate passive DP->HDMI and DP->DVI-D dongles
The call is expected to fail in DVI-D case but pass in HDMI case
Some HDMI dongles have a chance to fail as well, causing misdetection as DVI-D

[HOW]
Retry i2c_read to ensure failed result is valid

Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Michael Strauss 2019-10-03 11:54:15 -04:00 • committed by Alex Deucher

parent bf7f5ac316

commit 71fb7b2801

1 changed files with 18 additions and 6 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c

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