From: Bing Guo <bing....@amd.com>
[ 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.whee...@amd.com>
Signed-off-by: Bing Guo <bing....@amd.com>
Reviewed-by: Jun Lei <jun....@amd.com>
Acked-by: Anson Jacob <anson.ja...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 959eb075d11ed..c18f39271b034 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -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
--
2.27.0
