Op 09-09-2019 om 05:43 schreef Manasi Navare:
> In case of tiled displays when the two tiles are sent across two CRTCs
> over two separate DP SST connectors, we need a mechanism to synchronize
> the two CRTCs and their corresponding transcoders.
> So use the master-slave mode where there is one master corresponding
> to last horizontal and vertical tile that needs to be genlocked with
> all other slave tiles.
> This patch identifies saves the master transcoder in all the slave
> CRTC states. This is needed to select the master CRTC/transcoder
> while configuring transcoder port sync for the corresponding slaves.
>
> v3:
> * Use master_tramscoder instead of master_crtc for valid
> HW state readouts (Ville)
> v2:
> * Move this to intel_mode_set_pipe_config(Jani N, Ville)
> * Use slave_bitmask to save associated slaves in master crtc state (Ville)
>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Cc: Matt Roper <matthew.d.ro...@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 105 ++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_display.h | 1 +
> .../drm/i915/display/intel_display_types.h | 6 +
> 3 files changed, 112 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 4c30672bd108..8942c905ae66 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11745,6 +11745,91 @@ static bool c8_planes_changed(const struct
> intel_crtc_state *new_crtc_state)
> return !old_crtc_state->c8_planes != !new_crtc_state->c8_planes;
> }
>
> +static int icl_add_sync_mode_crtcs(struct drm_crtc *crtc,
> + struct intel_crtc_state *crtc_state,
> + struct drm_atomic_state *state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> + struct drm_connector *master_connector, *connector;
> + struct drm_connector_state *connector_state;
> + struct drm_connector_list_iter conn_iter;
> + struct drm_crtc *master_crtc = NULL;
> + struct drm_crtc_state *master_crtc_state;
> + struct intel_crtc_state *master_pipe_config;
> + int i, tile_group_id;
> +
> + if (INTEL_GEN(dev_priv) < 11)
> + return 0;
> +
> + /*
> + * In case of tiled displays there could be one or more slaves but
> there is
> + * only one master. Lets make the CRTC used by the connector
> corresponding
> + * to the last horizonal and last vertical tile a master/genlock CRTC.
> + * All the other CRTCs corresponding to other tiles of the same Tile
> group
> + * are the slave CRTCs and hold a pointer to their genlock CRTC.
> + */
> + for_each_new_connector_in_state(state, connector, connector_state, i) {
> + if (connector_state->crtc != crtc)
> + continue;
> + if (!connector->has_tile)
> + continue;
> + if (crtc_state->base.mode.hdisplay != connector->tile_h_size ||
> + crtc_state->base.mode.vdisplay != connector->tile_v_size)
> + return 0;
> + if (connector->tile_h_loc == connector->num_h_tile - 1 &&
> + connector->tile_v_loc == connector->num_v_tile - 1)
> + continue;
> + crtc_state->sync_mode_slaves_mask = 0;
> + tile_group_id = connector->tile_group->id;
> + drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
> + drm_for_each_connector_iter(master_connector, &conn_iter) {
> + struct drm_connector_state *master_conn_state = NULL;
> +
> + if (!master_connector->has_tile)
> + continue;
> + if (master_connector->tile_h_loc !=
> master_connector->num_h_tile - 1 ||
> + master_connector->tile_v_loc !=
> master_connector->num_v_tile - 1)
> + continue;
> + if (master_connector->tile_group->id != tile_group_id)
> + continue;
> +
> + master_conn_state =
> drm_atomic_get_connector_state(state,
> +
> master_connector);
> + if (IS_ERR(master_conn_state)) {
> + drm_connector_list_iter_end(&conn_iter);
> + return PTR_ERR(master_conn_state);
> + }
> + if (master_conn_state->crtc) {
> + master_crtc = master_conn_state->crtc;
> + break;
> + }
> + }
> + drm_connector_list_iter_end(&conn_iter);
> +
> + if (!master_crtc) {
> + DRM_DEBUG_KMS("Could not find Master CRTC for Slave
> CRTC %d\n",
> + connector_state->crtc->base.id);
> + return -EINVAL;
> + }
> +
> + master_crtc_state = drm_atomic_get_crtc_state(state,
> + master_crtc);
> + if (IS_ERR(master_crtc_state))
> + return PTR_ERR(master_crtc_state);
> +
> + master_pipe_config = to_intel_crtc_state(master_crtc_state);
> + crtc_state->master_transcoder =
> master_pipe_config->cpu_transcoder;
> + master_pipe_config->sync_mode_slaves_mask |=
> + BIT(crtc_state->cpu_transcoder);
> + DRM_DEBUG_KMS("Master Transcoder = %s added for Slave CRTC =
> %d, slave transcoder bitmask = %d\n",
> + transcoder_name(crtc_state->master_transcoder),
> + crtc_state->base.crtc->base.id,
> + master_pipe_config->sync_mode_slaves_mask);
> + }
Ugh, no better way than a double loop? :( Probably not. Looks good.
> +
> + return 0;
> +}
> +
> static int intel_crtc_atomic_check(struct drm_crtc *crtc,
> struct drm_crtc_state *crtc_state)
> {
> @@ -12250,6 +12335,12 @@ clear_intel_crtc_state(struct intel_crtc_state
> *crtc_state)
> if (IS_G4X(dev_priv) ||
> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> saved_state->wm = crtc_state->wm;
> + /* Save the slave bitmask which gets filled for master crtc state during
> + * slave atomic check call.
> + */
> + if (is_trans_port_sync_master(dev_priv, crtc_state))
> + saved_state->sync_mode_slaves_mask =
> + crtc_state->sync_mode_slaves_mask;
>
> /* Keep base drm_crtc_state intact, only clear our extended struct */
> BUILD_BUG_ON(offsetof(struct intel_crtc_state, base));
> @@ -12343,6 +12434,15 @@ intel_modeset_pipe_config(struct intel_crtc_state
> *pipe_config)
> drm_mode_set_crtcinfo(&pipe_config->base.adjusted_mode,
> CRTC_STEREO_DOUBLE);
>
> + /* Set the crtc_state defaults for trans_port_sync */
> + pipe_config->master_transcoder = INVALID_TRANSCODER;
> + ret = icl_add_sync_mode_crtcs(crtc, pipe_config, state);
> + if (ret) {
> + DRM_DEBUG_KMS("Cannot assign Sync Mode CRTCs: %d\n",
> + ret);
> + return ret;
> + }
> +
> /* Pass our mode to the connectors and the CRTC to give them a chance to
> * adjust it according to limitations or connector properties, and also
> * a chance to reject the mode entirely.
> @@ -12856,6 +12956,11 @@ intel_pipe_config_compare(const struct
> intel_crtc_state *current_config,
> PIPE_CONF_CHECK_INFOFRAME(hdmi);
> PIPE_CONF_CHECK_INFOFRAME(drm);
>
> + if (INTEL_GEN(dev_priv) >= 11) {
> + PIPE_CONF_CHECK_I(sync_mode_slaves_mask);
> + PIPE_CONF_CHECK_I(master_transcoder);
> + }
> +
> #undef PIPE_CONF_CHECK_X
> #undef PIPE_CONF_CHECK_I
> #undef PIPE_CONF_CHECK_BOOL
> diff --git a/drivers/gpu/drm/i915/display/intel_display.h
> b/drivers/gpu/drm/i915/display/intel_display.h
> index 33fd523c4622..c1011204b407 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.h
> +++ b/drivers/gpu/drm/i915/display/intel_display.h
> @@ -91,6 +91,7 @@ enum pipe {
> #define pipe_name(p) ((p) + 'A')
>
> enum transcoder {
> + INVALID_TRANSCODER = -1,
> /*
> * The following transcoders have a 1:1 transcoder -> pipe mapping,
> * keep their values fixed: the code assumes that TRANSCODER_A=0, the
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index d5cc4b810d9e..17ff34ca298b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -991,6 +991,12 @@ struct intel_crtc_state {
>
> /* Forward Error correction State */
> bool fec_enable;
> +
> + /* Pointer to master transcoder in case of tiled displays */
> + enum transcoder master_transcoder;
> +
> + /* Bitmask to indicate slaves attached */
> + u8 sync_mode_slaves_mask;
> };
>
> struct intel_crtc {
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