This allows iteration over encoders without requiring connection_mutex.
Changes since v1: - Add a set_best_encoder helper function and update encoder_mask inside it. Changes since v2: - Relax the WARN_ON(!crtc), with explanation. - Call set_best_encoder when connector is moved between crtc's. - Add some paranoia to steal_encoder to prevent accidentally setting best_encoder to NULL.
Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com --- diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 9c84b3b37631..391b3783e341 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -125,6 +125,47 @@ get_current_crtc_for_encoder(struct drm_device *dev, return NULL; }
+static void +set_best_encoder(struct drm_atomic_state *state, + struct drm_connector_state *conn_state, + struct drm_encoder *encoder) +{ + struct drm_crtc_state *crtc_state; + struct drm_crtc *crtc; + + if (conn_state->best_encoder) { + /* Unset the encoder_mask in the old crtc state. */ + crtc = conn_state->connector->state->crtc; + + /* A NULL crtc is an error here because we should have + * duplicated a NULL best_encoder when crtc was NULL. + * As an exception restoring duplicated atomic state + * during resume is allowed, so don't warn when + * best_encoder is equal to encoder we intend to set. + */ + WARN_ON(!crtc && encoder != conn_state->best_encoder); + if (crtc) { + crtc_state = drm_atomic_get_existing_crtc_state(state, crtc); + + crtc_state->encoder_mask &= + ~(1 << drm_encoder_index(conn_state->best_encoder)); + } + } + + if (encoder) { + crtc = conn_state->crtc; + WARN_ON(!crtc); + if (crtc) { + crtc_state = drm_atomic_get_existing_crtc_state(state, crtc); + + crtc_state->encoder_mask |= + 1 << drm_encoder_index(encoder); + } + } + + conn_state->best_encoder = encoder; +} + static int steal_encoder(struct drm_atomic_state *state, struct drm_encoder *encoder, @@ -164,7 +205,10 @@ steal_encoder(struct drm_atomic_state *state, if (IS_ERR(connector_state)) return PTR_ERR(connector_state);
- connector_state->best_encoder = NULL; + if (connector_state->best_encoder != encoder) + continue; + + set_best_encoder(state, connector_state, NULL); }
return 0; @@ -212,7 +256,7 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx) connector->base.id, connector->name);
- connector_state->best_encoder = NULL; + set_best_encoder(state, connector_state, NULL);
return 0; } @@ -241,6 +285,8 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx) }
if (new_encoder == connector_state->best_encoder) { + set_best_encoder(state, connector_state, new_encoder); + DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n", connector->base.id, connector->name, @@ -275,7 +321,8 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx) if (WARN_ON(!connector_state->crtc)) return -EINVAL;
- connector_state->best_encoder = new_encoder; + set_best_encoder(state, connector_state, new_encoder); + idx = drm_crtc_index(connector_state->crtc);
crtc_state = state->crtc_states[idx]; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d77968092ce4..2d9cc848f294 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -15604,6 +15604,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc) crtc->base.state->active = crtc->active; crtc->base.enabled = crtc->active; crtc->base.state->connector_mask = 0; + crtc->base.state->encoder_mask = 0;
/* Because we only establish the connector -> encoder -> * crtc links if something is active, this means the @@ -15843,6 +15844,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev) */ encoder->base.crtc->state->connector_mask |= 1 << drm_connector_index(&connector->base); + encoder->base.crtc->state->encoder_mask |= + 1 << drm_encoder_index(&encoder->base); }
} else { diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index c0226f945d62..51287f36b214 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -307,6 +307,7 @@ struct drm_plane_helper_funcs; * @connectors_changed: connectors to this crtc have been updated * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes * @connector_mask: bitmask of (1 << drm_connector_index(connector)) of attached connectors + * @encoder_mask: bitmask of (1 << drm_encoder_index(encoder)) of attached encoders * @last_vblank_count: for helpers and drivers to capture the vblank of the * update to ensure framebuffer cleanup isn't done too early * @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings @@ -341,6 +342,7 @@ struct drm_crtc_state { u32 plane_mask;
u32 connector_mask; + u32 encoder_mask;
/* last_vblank_count: for vblank waits before cleanup */ u32 last_vblank_count;