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drm/amd/display: Change function decide_dp_link_settings to avoid infinite looping 

[ Upstream commit 4716a7c50c5c66d6ddc42401e1e0ba13b492e105 ]

Why:
Function decide_dp_link_settings() loops infinitely when required bandwidth
can't be supported.

How:
Check the required bandwidth against verified_link_cap before trying to
find a link setting for it.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Bing Guo <bing.guo@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <anson.jacob@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bing Guo 2021-01-04 14:09:41 -05:00 committed by Greg Kroah-Hartman
parent 53c10bbf91
commit 88240f7ac2
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -1914,6 +1914,9 @@ static bool decide_dp_link_settings(struct dc_link *link, struct dc_link_setting
initial_link_setting;
uint32_t link_bw;
if (req_bw > dc_link_bandwidth_kbps(link, &link->verified_link_cap))
return false;
/* search for the minimum link setting that:
* 1. is supported according to the link training result
* 2. could support the b/w requested by the timing