From: Ryan Lin <tsung-hua.lin@xxxxxxx>
[ 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@xxxxxxx>
Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Signed-off-by: Ryan Lin <tsung-hua.lin@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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,
--
2.39.2
