On Tue, Oct 24, 2023 at 04:09:22AM +0300, Imre Deak wrote: > Enabling / disabling DSC decompression in the branch device downstream > of the source may reset the while branch device. To avoid this while the > streams are still active, force a modeset on all CRTC/ports connected to > this branch device. > > Signed-off-by: Imre Deak <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_display.c | 4 ++ > drivers/gpu/drm/i915/display/intel_dp_mst.c | 72 ++++++++++++++++++++ > drivers/gpu/drm/i915/display/intel_dp_mst.h | 2 + > 3 files changed, 78 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c > b/drivers/gpu/drm/i915/display/intel_display.c > index 22f88389035bd..a33e5bbf5165a 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -6490,6 +6490,10 @@ int intel_atomic_check(struct drm_device *dev, > if (!new_crtc_state->hw.enable || > intel_crtc_needs_modeset(new_crtc_state)) > continue; > > + if (intel_dp_mst_crtc_needs_modeset(state, crtc)) > + intel_modeset_pipes_in_mask_early(state, "MST topology", > + BIT(crtc->pipe)); > + > if (intel_dp_mst_is_slave_trans(new_crtc_state)) { > enum transcoder master = > new_crtc_state->mst_master_transcoder; > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c > b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index 9f4894c2e7860..d4dcfb2c09b2a 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -1606,3 +1606,75 @@ int intel_dp_mst_add_topology_state_for_crtc(struct > intel_atomic_state *state, > > return 0; > } > + > +static struct intel_connector * > +get_connector_in_state_for_crtc(struct intel_atomic_state *state, > + const struct intel_crtc *crtc) > +{ > + struct drm_connector_state *old_conn_state; > + struct drm_connector_state *new_conn_state; > + struct drm_connector *_connector; > + int i; > + > + for_each_oldnew_connector_in_state(&state->base, _connector, > + old_conn_state, new_conn_state, i) { > + struct intel_connector *connector = > + to_intel_connector(_connector); > + > + if (old_conn_state->crtc == &crtc->base || > + new_conn_state->crtc == &crtc->base) > + return connector; > + } > + > + return NULL; > +} > + > +bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state, > + struct intel_crtc *crtc) > +{ > + const struct intel_connector *crtc_connector; > + const struct drm_connector_state *conn_state; > + const struct drm_connector *_connector; > + int i; > + > + if (!intel_crtc_has_type(intel_atomic_get_new_crtc_state(state, crtc), > + INTEL_OUTPUT_DP_MST)) > + return false; > + > + crtc_connector = get_connector_in_state_for_crtc(state, crtc); > + > + if (!crtc_connector) > + /* None of the connectors in the topology needs modeset */ > + return false; > + > + for_each_new_connector_in_state(&state->base, _connector, conn_state, > i) { > + const struct intel_connector *connector = > + to_intel_connector(_connector); > + const struct intel_crtc_state *new_crtc_state = > + intel_atomic_get_new_crtc_state(state, crtc); > + const struct intel_crtc_state *old_crtc_state = > + intel_atomic_get_old_crtc_state(state, crtc);
What's supposed to be happening here? You're just checking the same crtc every time through the loop. > + > + if (connector->mst_port != crtc_connector->mst_port) > + continue; > + > + if (!intel_crtc_needs_modeset(new_crtc_state)) > + continue; > + > + if (old_crtc_state->dsc.compression_enable == > + new_crtc_state->dsc.compression_enable) > + continue; > + > + /* > + * Toggling the compression flag because of this stream in the > first > + * downstream branch device's UFP DPCD may reset the whole > branch > + * device. To avoid the reset while other streams are also > + * active modeset the whole MST topology in this case. > + */ > + if (connector->dp.dsc_decompression_aux == > + &connector->mst_port->aux) > + return true; > + } > + > + return false; > +} > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h > b/drivers/gpu/drm/i915/display/intel_dp_mst.h > index f1815bb722672..fc5e85776a858 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.h > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h > @@ -22,5 +22,7 @@ bool intel_dp_mst_is_slave_trans(const struct > intel_crtc_state *crtc_state); > bool intel_dp_mst_source_support(struct intel_dp *intel_dp); > int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state > *state, > struct intel_crtc *crtc); > +bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state, > + struct intel_crtc *crtc); > > #endif /* __INTEL_DP_MST_H__ */ > -- > 2.39.2 -- Ville Syrjälä Intel
