linux/drivers/gpu/drm/amd/display
Qingqing Zhuo 2e6cc93e1b drm/amd/display: workaround for hard hang on HPD on native DP
[ Upstream commit c4152b297d ]

[Why]
HPD disable and enable sequences are not mutually exclusive
on Linux. For HPDs that spans over 1s (i.e. HPD low = 1s),
part of the disable sequence (specifically, a request to SMU
to lower refclk) could come right before the call to PHY
enable, causing DMUB to access an unresponsive PHY
and thus a hard hang on the system.

[How]
Disable 48mhz refclk off on native DP.

Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-08-26 08:35:39 -04:00
..
amdgpu_dm drm/amd/display: use GFP_ATOMIC in amdgpu_dm_irq_schedule_work 2021-08-18 08:59:07 +02:00
dc drm/amd/display: workaround for hard hang on HPD on native DP 2021-08-26 08:35:39 -04:00
dmub drm/amd/display: [FW Promotion] Release 0.0.35 2020-09-29 16:11:04 -04:00
include drm/amdgpu/display: remove DRM_AMD_DC_GREEN_SARDINE 2020-11-04 08:43:50 -05:00
modules drm/amd/display: Avoid HDCP over-read and corruption 2021-07-19 09:44:45 +02:00
Kconfig drm/amdgpu/display: drop DCN support for aarch64 2021-01-23 16:03:58 +01:00
Makefile drm/amd/display: Drop CONFIG_DRM_AMD_DC_DMUB guards 2019-11-13 15:29:42 -05:00
TODO