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

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[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>
This commit is contained in:
Ryan Lin
2023-02-07 23:03:48 +08:00
committed by Alex Deucher
parent 61d2a9bec4
commit 1e5d4d8eb8
3 changed files with 11 additions and 2 deletions
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10
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -41,6 +41,8 @@
#include "dpcd_defs.h"
#include "link/protocols/link_dpcd.h"
#include "link_service_types.h"
#include "link/protocols/link_dp_capability.h"
#include "link/protocols/link_ddc.h"
#include "vid.h"
#include "amdgpu.h"
@@ -2302,6 +2304,14 @@ 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.
*/
try_to_configure_aux_timeout(aconnector->dc_link->ddc, LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
if (!dp_is_lttpr_present(aconnector->dc_link))
try_to_configure_aux_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,