This reverts commit ec5fa9fcdeca69edf7dab5ca3b2e0ceb1c08fe9a. Reports are that this causes problems with external monitors after wake up from suspend, which is something it was directly supposed to help.
Cc: Linux Regressions <regressi...@lists.linux.dev> Cc: sta...@vger.kernel.org Cc: Daniel Wheeler <daniel.whee...@amd.com> Cc: Wayne Lin <wayne....@amd.com> Reported-by: Oliver Schmidt <oli...@luced.de> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218211 Link: https://forum.manjaro.org/t/problems-with-external-monitor-wake-up-after-suspend/151840 Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3023 Signed-off-by: Mario Limonciello <mario.limonciello <mario.limoncie...@amd.com> --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 93 +++---------------- 1 file changed, 13 insertions(+), 80 deletions(-) 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 c146dc9cba92..1ba58e4ecab3 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2363,62 +2363,14 @@ static int dm_late_init(void *handle) return detect_mst_link_for_all_connectors(adev_to_drm(adev)); } -static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr) -{ - int ret; - u8 guid[16]; - u64 tmp64; - - mutex_lock(&mgr->lock); - if (!mgr->mst_primary) - goto out_fail; - - if (drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd) < 0) { - drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); - goto out_fail; - } - - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | - DP_UP_REQ_EN | - DP_UPSTREAM_IS_SRC); - if (ret < 0) { - drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n"); - goto out_fail; - } - - /* Some hubs forget their guids after they resume */ - ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); - if (ret != 16) { - drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); - goto out_fail; - } - - if (memchr_inv(guid, 0, 16) == NULL) { - tmp64 = get_jiffies_64(); - memcpy(&guid[0], &tmp64, sizeof(u64)); - memcpy(&guid[8], &tmp64, sizeof(u64)); - - ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, guid, 16); - - if (ret != 16) { - drm_dbg_kms(mgr->dev, "check mstb guid failed - undocked during suspend?\n"); - goto out_fail; - } - } - - memcpy(mgr->mst_primary->guid, guid, 16); - -out_fail: - mutex_unlock(&mgr->lock); -} - static void s3_handle_mst(struct drm_device *dev, bool suspend) { struct amdgpu_dm_connector *aconnector; struct drm_connector *connector; struct drm_connector_list_iter iter; struct drm_dp_mst_topology_mgr *mgr; + int ret; + bool need_hotplug = false; drm_connector_list_iter_begin(dev, &iter); drm_for_each_connector_iter(connector, &iter) { @@ -2444,15 +2396,18 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) if (!dp_is_lttpr_present(aconnector->dc_link)) try_to_configure_aux_timeout(aconnector->dc_link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD); - /* TODO: move resume_mst_branch_status() into drm mst resume again - * once topology probing work is pulled out from mst resume into mst - * resume 2nd step. mst resume 2nd step should be called after old - * state getting restored (i.e. drm_atomic_helper_resume()). - */ - resume_mst_branch_status(mgr); + ret = drm_dp_mst_topology_mgr_resume(mgr, true); + if (ret < 0) { + dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx, + aconnector->dc_link); + need_hotplug = true; + } } } drm_connector_list_iter_end(&iter); + + if (need_hotplug) + drm_kms_helper_hotplug_event(dev); } static int amdgpu_dm_smu_write_watermarks_table(struct amdgpu_device *adev) @@ -2849,8 +2804,7 @@ static int dm_resume(void *handle) struct dm_atomic_state *dm_state = to_dm_atomic_state(dm->atomic_obj.state); enum dc_connection_type new_connection_type = dc_connection_none; struct dc_state *dc_state; - int i, r, j, ret; - bool need_hotplug = false; + int i, r, j; if (dm->dc->caps.ips_support) { dc_dmub_srv_exit_low_power_state(dm->dc); @@ -2957,7 +2911,7 @@ static int dm_resume(void *handle) continue; /* - * this is the case when traversing through already created end sink + * this is the case when traversing through already created * MST connectors, should be skipped */ if (aconnector && aconnector->mst_root) @@ -3017,27 +2971,6 @@ static int dm_resume(void *handle) dm->cached_state = NULL; - /* Do mst topology probing after resuming cached state*/ - drm_connector_list_iter_begin(ddev, &iter); - drm_for_each_connector_iter(connector, &iter) { - aconnector = to_amdgpu_dm_connector(connector); - if (aconnector->dc_link->type != dc_connection_mst_branch || - aconnector->mst_root) - continue; - - ret = drm_dp_mst_topology_mgr_resume(&aconnector->mst_mgr, true); - - if (ret < 0) { - dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx, - aconnector->dc_link); - need_hotplug = true; - } - } - drm_connector_list_iter_end(&iter); - - if (need_hotplug) - drm_kms_helper_hotplug_event(ddev); - amdgpu_dm_irq_resume_late(adev); amdgpu_dm_smu_write_watermarks_table(adev); -- 2.34.1
