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.
v4:
* Rebase
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.vetter@xxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
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 c05ba6af6226..dcea0a935952 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -11773,6 +11773,91 @@ 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);
+ }
+
+ return 0;
+}
+
static int intel_crtc_atomic_check(struct drm_crtc *_crtc,
struct drm_crtc_state *_crtc_state)
{
@@ -12276,6 +12361,12 @@ 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));
@@ -12369,6 +12460,15 @@ 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.
@@ -12882,6 +12982,11 @@ 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 b1ae0e59c715..f303009c0170 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -93,6 +93,7 @@ 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 {
--
2.19.1
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