Acked-by: Lyude Paul <lyude@xxxxxxxxxx> BTW - I made a ton of progress last week on getting all of this stuff moved into the atomic state :), mainly just trying to get amd hooked up with this now (and need to rebase): https://gitlab.freedesktop.org/lyudess/linux/-/commits/wip/mst-atomic-only-v1 So we soon won't need this slots hack On Tue, 2022-01-25 at 19:03 +0200, Jani Nikula wrote: > 128b/132b supports using 64 slots starting from 0, while 8b/10b reserves > slot 0 for metadata. > > Commit d6c6a76f80a1 ("drm: Update MST First Link Slot Information Based > on Encoding Format") added support for updating the topology state > accordingly, and commit 41724ea273cd ("drm/amd/display: Add DP 2.0 MST > DM Support") started using it in the amd driver. > > This feels more than a little cumbersome, especially updating the > information in atomic check. For i915, add the update to MST connector > .compute_config hook rather than iterating over all MST managers and > connectors in global mode config .atomic_check. Fingers crossed. > > v2: > - Update in .compute_config() not .atomic_check (Ville) > > Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx> > Cc: Lyude Paul <lyude@xxxxxxxxxx> > Cc: Uma Shankar <uma.shankar@xxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_dp_mst.c | 29 +++++++++++++++++++-- > 1 file changed, 27 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c > b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index b8bc7d397c81..ff75e22bde5c 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -99,6 +99,27 @@ static int intel_dp_mst_compute_link_config(struct > intel_encoder *encoder, > return 0; > } > > +static void intel_dp_mst_update_slots(struct intel_encoder *encoder, > + struct intel_crtc_state *crtc_state, > + struct drm_connector_state > *conn_state) > +{ > + struct drm_i915_private *i915 = to_i915(encoder->base.dev); > + struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder); > + struct intel_dp *intel_dp = &intel_mst->primary->dp; > + struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr; > + struct drm_dp_mst_topology_state *topology_state; > + u8 link_coding_cap = intel_dp_is_uhbr(crtc_state) ? > + DP_CAP_ANSI_128B132B : DP_CAP_ANSI_8B10B; > + > + topology_state = drm_atomic_get_mst_topology_state(conn_state- > >state, mgr); > + if (IS_ERR(topology_state)) { > + drm_dbg_kms(&i915->drm, "slot update failed\n"); > + return; > + } > + > + drm_dp_mst_update_slots(topology_state, link_coding_cap); > +} > + > static int intel_dp_mst_compute_config(struct intel_encoder *encoder, > struct intel_crtc_state *pipe_config, > struct drm_connector_state > *conn_state) > @@ -155,6 +176,8 @@ static int intel_dp_mst_compute_config(struct > intel_encoder *encoder, > if (ret) > return ret; > > + intel_dp_mst_update_slots(encoder, pipe_config, conn_state); > + > pipe_config->limited_color_range = > intel_dp_limited_color_range(pipe_config, conn_state); > > @@ -357,6 +380,7 @@ static void intel_mst_disable_dp(struct > intel_atomic_state *state, > struct intel_connector *connector = > to_intel_connector(old_conn_state->connector); > struct drm_i915_private *i915 = to_i915(connector->base.dev); > + int start_slot = intel_dp_is_uhbr(old_crtc_state) ? 0 : 1; > int ret; > > drm_dbg_kms(&i915->drm, "active links %d\n", > @@ -366,7 +390,7 @@ static void intel_mst_disable_dp(struct > intel_atomic_state *state, > > drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port); > > - ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, 1); > + ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, start_slot); > if (ret) { > drm_dbg_kms(&i915->drm, "failed to update payload %d\n", > ret); > } > @@ -475,6 +499,7 @@ static void intel_mst_pre_enable_dp(struct > intel_atomic_state *state, > struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); > struct intel_connector *connector = > to_intel_connector(conn_state->connector); > + int start_slot = intel_dp_is_uhbr(pipe_config) ? 0 : 1; > int ret; > bool first_mst_stream; > > @@ -509,7 +534,7 @@ static void intel_mst_pre_enable_dp(struct > intel_atomic_state *state, > > intel_dp->active_mst_links++; > > - ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, 1); > + ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, start_slot); > > /* > * Before Gen 12 this is not done as part of -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat
