drm/amd/display: workaround for hard hang on HPD on native DP

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[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>

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Qingqing Zhuo 2021-07-22 14:48:54 -04:00 • committed by Alex Deucher

parent e13c2ea2f5

commit dd2939efd5

1 changed files with 3 additions and 1 deletions

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drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

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