diff options
| author | Bing Guo <bing.guo@amd.com> | 2021-01-04 14:09:41 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-07 15:35:49 +0100 |
| commit | 88240f7ac22147e7d831bf052085bb4bbf4d06e6 (patch) | |
| tree | c7cb8cf0d96a3cb3aa7e0c3c294f13531ad2fabe | |
| parent | 53c10bbf9186086485990aed054d852940992d20 (diff) | |
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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 |
1 files changed, 3 insertions, 0 deletions
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 959eb075d11e..c18f39271b03 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 |