From: Imre Deak imre.deak@intel.com
[ Upstream commit e9b36c5be2e7fdef2cc933c1dac50bd81881e9b8 ]
Factor out a function to queue a work for probing the topology, also used by the next patch.
Cc: Lyude Paul lyude@redhat.com Cc: dri-devel@lists.freedesktop.org Reviewed-by: Lyude Paul lyude@redhat.com Signed-off-by: Imre Deak imre.deak@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-2-imre.... Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 08f8a22431fe..2a6feb83f786 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -2692,6 +2692,11 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work) drm_kms_helper_hotplug_event(dev); }
+static void drm_dp_mst_queue_probe_work(struct drm_dp_mst_topology_mgr *mgr) +{ + queue_work(system_long_wq, &mgr->work); +} + static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, u8 *guid) { @@ -3643,7 +3648,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms /* Write reset payload */ drm_dp_dpcd_write_payload(mgr, 0, 0, 0x3f);
- queue_work(system_long_wq, &mgr->work); + drm_dp_mst_queue_probe_work(mgr);
ret = 0; } else { @@ -3766,7 +3771,7 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, * state of our in-memory topology back into sync with reality. So, * restart the probing process as if we're probing a new hub */ - queue_work(system_long_wq, &mgr->work); + drm_dp_mst_queue_probe_work(mgr); mutex_unlock(&mgr->lock);
if (sync) {
From: Imre Deak imre.deak@intel.com
[ Upstream commit dbaeef363ea54f4c18112874b77503c72ba60fec ]
A follow up i915 patch will need to reprobe the MST topology after the initial probing, add a helper for this.
Cc: Lyude Paul lyude@redhat.com Cc: dri-devel@lists.freedesktop.org Reviewed-by: Lyude Paul lyude@redhat.com Signed-off-by: Imre Deak imre.deak@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-3-imre.... Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 27 +++++++++++++++++++ include/drm/display/drm_dp_mst_helper.h | 2 ++ 2 files changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 2a6feb83f786..71a30387ca12 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3685,6 +3685,33 @@ drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); }
+/** + * drm_dp_mst_topology_queue_probe - Queue a topology probe + * @mgr: manager to probe + * + * Queue a work to probe the MST topology. Driver's should call this only to + * sync the topology's HW->SW state after the MST link's parameters have + * changed in a way the state could've become out-of-sync. This is the case + * for instance when the link rate between the source and first downstream + * branch device has switched between UHBR and non-UHBR rates. Except of those + * cases - for instance when a sink gets plugged/unplugged to a port - the SW + * state will get updated automatically via MST UP message notifications. + */ +void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->lock); + + if (drm_WARN_ON(mgr->dev, !mgr->mst_state || !mgr->mst_primary)) + goto out_unlock; + + drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); + drm_dp_mst_queue_probe_work(mgr); + +out_unlock: + mutex_unlock(&mgr->lock); +} +EXPORT_SYMBOL(drm_dp_mst_topology_queue_probe); + /** * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager * @mgr: manager to suspend diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h index ab1d73f93408..46705dacdd08 100644 --- a/include/drm/display/drm_dp_mst_helper.h +++ b/include/drm/display/drm_dp_mst_helper.h @@ -859,6 +859,8 @@ int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); void drm_dp_mst_dump_topology(struct seq_file *m, struct drm_dp_mst_topology_mgr *mgr);
+void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr); + void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); int __must_check drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
From: Wayne Lin Wayne.Lin@amd.com
[ Upstream commit bc068194f548ef1f230d96c4398046bf59165992 ]
[Why] Observe after suspend/resme, we can't light up mst monitors under specific mst hub. The reason is that driver still writes DPCD DP_MSTM_CTRL after LT. It's forbidden even we write the same value for that dpcd register.
[How] We already resume the mst branch device dpcd settings during resume_mst_branch_status(). Leverage drm_dp_mst_topology_queue_probe() to only probe the topology, not calling drm_dp_mst_topology_mgr_resume() which will set DP_MSTM_CTRL as well.
Reviewed-by: Jerry Zuo jerry.zuo@amd.com Change-Id: I879e9f2e53dfb6fa28a33b6202a5402945ae91c5 Signed-off-by: Wayne Lin Wayne.Lin@amd.com Signed-off-by: Zaeem Mohamed zaeem.mohamed@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com [cascardo: adjust context in local declarations] Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 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 986ee37688c1..2b7f98a2e36f 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2825,8 +2825,7 @@ 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 (amdgpu_in_reset(adev)) { dc_state = dm->cached_dc_state; @@ -3003,23 +3002,16 @@ static int dm_resume(void *handle) 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_dp_mst_topology_queue_probe(&aconnector->mst_mgr); } 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);
+ drm_kms_helper_hotplug_event(ddev); + return 0; }
linux-stable-mirror@lists.linaro.org
-
Thadeu Lima de Souza Cascardo