[PATCH v3 3/7] drm/atomic: Always call steal_encoder, v2.

Maarten Lankhorst
2016-03-03T09:17:38Z

There's no need to have a separate function to get the crtc
which is stolen, this can already be found when actually
stealing the encoder.

drm_for_each_connector already checks for connection_mutex, so
use that macro now.

Changes since v1:
- Do not check for NULL crtc in connector_state,
this may happen when a crtc is disabled and its encoder stolen.
- Because of this, use connector->state->crtc instead of conn_state->crtc.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 74 ++++++++++---------------------------
1 file changed, 20 insertions(+), 54 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 3d1f97a832fc..72ca85b32260 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -106,25 +106,6 @@ check_pending_encoder_assignment(struct drm_atomic_state *state,
return true;
}

-static struct drm_crtc *
-get_current_crtc_for_encoder(struct drm_device *dev,
- struct drm_encoder *encoder)
-{
- struct drm_mode_config *config = &dev->mode_config;
- struct drm_connector *connector;
-
- WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
-
- drm_for_each_connector(connector, dev) {
- if (connector->state->best_encoder != encoder)
- continue;
-
- return connector->state->crtc;
- }
-
- return NULL;
-}
-
static void
set_best_encoder(struct drm_atomic_state *state,
struct drm_connector_state *conn_state,
@@ -168,38 +149,18 @@ set_best_encoder(struct drm_atomic_state *state,

static int
steal_encoder(struct drm_atomic_state *state,
- struct drm_encoder *encoder,
- struct drm_crtc *encoder_crtc)
+ struct drm_encoder *encoder)
{
- struct drm_mode_config *config = &state->dev->mode_config;
struct drm_crtc_state *crtc_state;
struct drm_connector *connector;
struct drm_connector_state *connector_state;

- /*
- * We can only steal an encoder coming from a connector, which means we
- * must already hold the connection_mutex.
- */
- WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
-
- DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
- encoder->base.id, encoder->name,
- encoder_crtc->base.id, encoder_crtc->name);
+ drm_for_each_connector(connector, state->dev) {
+ struct drm_crtc *encoder_crtc;

- crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
- if (IS_ERR(crtc_state))
- return PTR_ERR(crtc_state);
-
- crtc_state->connectors_changed = true;
-
- list_for_each_entry(connector, &config->connector_list, head) {
if (connector->state->best_encoder != encoder)
continue;

- DRM_DEBUG_ATOMIC("Stealing encoder from [CONNECTOR:%d:%s]\n",
- connector->base.id,
- connector->name);
-
connector_state = drm_atomic_get_connector_state(state,
connector);
if (IS_ERR(connector_state))
@@ -208,7 +169,18 @@ steal_encoder(struct drm_atomic_state *state,
if (connector_state->best_encoder != encoder)
continue;

+ encoder_crtc = connector->state->crtc;
+
+ DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
+ encoder->base.id, encoder->name,
+ encoder_crtc->base.id, encoder_crtc->name);
+
set_best_encoder(state, connector_state, NULL);
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state, encoder_crtc);
+ crtc_state->connectors_changed = true;
+
+ return 0;
}

return 0;
@@ -221,7 +193,6 @@ update_connector_routing(struct drm_atomic_state *state,
{
const struct drm_connector_helper_funcs *funcs;
struct drm_encoder *new_encoder;
- struct drm_crtc *encoder_crtc;
struct drm_crtc_state *crtc_state;
int idx, ret;

@@ -299,17 +270,12 @@ update_connector_routing(struct drm_atomic_state *state,
return -EINVAL;
}

- encoder_crtc = get_current_crtc_for_encoder(state->dev,
- new_encoder);
-
- if (encoder_crtc) {
- ret = steal_encoder(state, new_encoder, encoder_crtc);
- if (ret) {
- DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
- connector->base.id,
- connector->name);
- return ret;
- }
+ ret = steal_encoder(state, new_encoder);
+ if (ret) {
+ DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
+ connector->base.id,
+ connector->name);
+ return ret;
}

if (WARN_ON(!connector_state->crtc))
--
2.1.0

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