tree 12182fa5d1e27ac683ed3140b3b1e24450865737
parent 7c37d399c2b84d4b79de4d512a38373f1d71ab90
author Michael Strauss <michael.strauss@amd.com> 1570118055 -0400
committer Alex Deucher <alexander.deucher@amd.com> 1572450976 -0400

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

[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>