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author | Mikita Lipski <mikita.lipski@amd.com> | 2019-11-16 13:32:15 -0500 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2020-01-09 18:07:48 -0500 |
commit | 8ec046716ca8ee79a9d2699f78511c08753c2e56 (patch) | |
tree | 1dee73d20b2ba10cc241e524ba1a95c38ab88b6f /drivers/gpu/drm/drm_dp_mst_topology.c | |
parent | 29b9ba74f6384a81594e479b3f1750868c72f356 (diff) | |
download | linux-8ec046716ca8ee79a9d2699f78511c08753c2e56.tar.gz linux-8ec046716ca8ee79a9d2699f78511c08753c2e56.tar.bz2 linux-8ec046716ca8ee79a9d2699f78511c08753c2e56.zip |
drm/dp_mst: Add helper to trigger modeset on affected DSC MST CRTCs
[why]
Whenever a connector on an MST network is changed or
undergoes a modeset, the DSC configs for each stream on that
topology will be recalculated. This can change their required
bandwidth, requiring a full reprogramming, as though a modeset
was performed, even if that stream did not change timing.
[how]
Adding helper to trigger modesets on MST DSC connectors
by setting mode_changed flag on CRTCs in the same topology
as affected connector
v2: use drm_dp_mst_dsc_aux_for_port function to verify
if the port is DSC capable
v3: - added _must_check attribute
- removed topology manager check
- fix typos and indentations
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c')
-rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 6a7078e538e5..7d174ba78eba 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -4849,6 +4849,67 @@ drm_dp_mst_atomic_check_vcpi_alloc_limit(struct drm_dp_mst_topology_mgr *mgr, } /** + * drm_dp_mst_add_affected_dsc_crtcs + * @state: Pointer to the new struct drm_dp_mst_topology_state + * @port: Port pointer of connector with new state + * + * Whenever there is a change in mst topology + * DSC configuration would have to be recalculated + * therefore we need to trigger modeset on all affected + * CRTCs in that topology + * + * See also: + * drm_dp_mst_atomic_enable_dsc() + */ +int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_mst_topology_state *mst_state; + struct drm_dp_vcpi_allocation *pos; + struct drm_connector *connector; + struct drm_connector_state *conn_state; + struct drm_crtc *crtc; + struct drm_crtc_state *crtc_state; + + mst_state = drm_atomic_get_mst_topology_state(state, mgr); + + if (IS_ERR(mst_state)) + return -EINVAL; + + list_for_each_entry(pos, &mst_state->vcpis, next) { + + connector = pos->port->connector; + + if (!connector) + return -EINVAL; + + conn_state = drm_atomic_get_connector_state(state, connector); + + if (IS_ERR(conn_state)) + return PTR_ERR(conn_state); + + crtc = conn_state->crtc; + + if (WARN_ON(!crtc)) + return -EINVAL; + + if (!drm_dp_mst_dsc_aux_for_port(pos->port)) + continue; + + crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc); + + if (IS_ERR(crtc_state)) + return PTR_ERR(crtc_state); + + DRM_DEBUG_ATOMIC("[MST MGR:%p] Setting mode_changed flag on CRTC %p\n", + mgr, crtc); + + crtc_state->mode_changed = true; + } + return 0; +} +EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs); + +/** * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off * @state: Pointer to the new drm_atomic_state * @port: Pointer to the affected MST Port |