From: Ryan Lin Date: Tue, 9 May 2023 16:01:20 +0000 (-0500) Subject: drm/amd/display: Ext displays with dock can't recognized after resume X-Git-Tag: v6.2.16~228 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a864f74c95f2f2944d687024dfb2d0db7c7f95e;p=thirdparty%2Fkernel%2Fstable.git drm/amd/display: Ext displays with dock can't recognized after resume [ 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 Acked-by: Qingqing Zhuo Signed-off-by: Ryan Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- 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,