From: Ryan Lin tsung-hua.lin@amd.com
[ Upstream commit 1e5d4d8eb8c0f15d90c50e7abd686c980e54e42e ]
[Why] Needs to set the default value of the LTTPR timeout after resume.
[How] Set the default (3.2ms) timeout at resuming if the sink supports LTTPR
Reviewed-by: Jerry Zuo Jerry.Zuo@amd.com Acked-by: Qingqing Zhuo qingqing.zhuo@amd.com Signed-off-by: Ryan Lin tsung-hua.lin@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 422909d1f352b..58fdd39f5bde9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -39,6 +39,7 @@ #include "dc/dc_edid_parser.h" #include "dc/dc_stat.h" #include "amdgpu_dm_trace.h" +#include "dc/inc/dc_link_ddc.h"
#include "vid.h" #include "amdgpu.h" @@ -2262,6 +2263,14 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) if (suspend) { drm_dp_mst_topology_mgr_suspend(mgr); } else { + /* if extended timeout is supported in hardware, + * default to LTTPR timeout (3.2ms) first as a W/A for DP link layer + * CTS 4.2.1.1 regression introduced by CTS specs requirement update. + */ + dc_link_aux_try_to_configure_timeout(aconnector->dc_link->ddc, LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD); + if (!dp_is_lttpr_present(aconnector->dc_link)) + dc_link_aux_try_to_configure_timeout(aconnector->dc_link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD); + ret = drm_dp_mst_topology_mgr_resume(mgr, true); if (ret < 0) { dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx,