linux/drivers/gpu/drm/amd
Paul Hsieh bd4905a958 drm/amd/display: Add retry to read ddc_clock pin
[WHY]
On customer board, there is one pluse (1v , < 1ms) on
DDC_CLK pin when plug / unplug DP cable. Driver will read
it and config DP to HDMI/DVI dongle.

[HOW]
If there is a real dongle, DDC_CLK should be always pull high.
Try to read again to recovery this special case. Retry times = 3.
Need additional 3ms to detect DP passive dongle(3 failures)

Signed-off-by: Paul Hsieh <paul.hsieh@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-12-18 18:25:12 -05:00
..
acp drm/amdgpu: Remove wrapper layer of cgs irq handling 2018-03-21 14:36:58 -05:00
amdgpu drm/amdgpu: correct the return value for error case 2018-12-18 17:39:18 -05:00
amdkfd drm/amdkfd: Fix handling of return code of dma_buf_get 2018-12-18 17:39:11 -05:00
display drm/amd/display: Add retry to read ddc_clock pin 2018-12-18 18:25:12 -05:00
include drm/amdkfd: Add support for doorbell BOs 2018-12-07 18:14:00 -05:00
lib drm/amdgpu: add license to Makefiles 2017-12-07 11:51:10 -05:00
powerplay Merge branch 'drm-next-4.21' of git://people.freedesktop.org/~agd5f/linux into drm-next 2018-12-13 10:06:34 +10:00