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drm/amd/display: Ext displays with dock can't recognized after resume

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[ Upstream commit 1e5d4d8eb8 ]

[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>
This commit is contained in:
Ryan Lin
2023-05-09 11:01:20 -05:00
committed by Greg Kroah-Hartman
parent d69d5e2a81
commit 28d0f85aff
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -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"
@@ -2254,6 +2255,14 @@ 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,