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drm/atomic: Handle encoder assignment conflicts in a separate check, v3. 

The current check doesn't handle the case where we don't steal an
encoder, but keep it on the current connector. If we repurpose
disable_conflicting_encoders to do the checking, we just have
to reject the ones that conflict.

Changes since v1:
- Return early with empty encoder_mask, drm_for_each_connector
  requires connection_mutex held.
Changes since v2:
- Add comments for the loops.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Testcase: kms_setmode.invalid-clone-single-crtc-stealing
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1456996662-8704-6-git-send-email-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2016-03-03 10:17:40 +01:00 committed by Daniel Vetter
parent 40616a26d1
commit 8248b65df6
1 changed files with 43 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -86,7 +86,8 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
}
}
static int disable_conflicting_connectors(struct drm_atomic_state *state)
static int handle_conflicting_encoders(struct drm_atomic_state *state,
bool disable_conflicting_encoders)
{
struct drm_connector_state *conn_state;
struct drm_connector *connector;
@ -94,6 +95,11 @@ static int disable_conflicting_connectors(struct drm_atomic_state *state)
unsigned encoder_mask = 0;
int i, ret;
/*
* First loop, find all newly assigned encoders from the connectors
* part of the state. If the same encoder is assigned to multiple
* connectors bail out.
*/
for_each_connector_in_state(state, connector, conn_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
struct drm_encoder *new_encoder;
@ -106,10 +112,33 @@ static int disable_conflicting_connectors(struct drm_atomic_state *state)
else
new_encoder = funcs->best_encoder(connector);
if (new_encoder)
if (new_encoder) {
if (encoder_mask & (1 << drm_encoder_index(new_encoder))) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
new_encoder->base.id, new_encoder->name,
connector->base.id, connector->name);
return -EINVAL;
}
encoder_mask |= 1 << drm_encoder_index(new_encoder);
}
}
if (!encoder_mask)
return 0;
/*
* Second loop, iterate over all connectors not part of the state.
*
* If a conflicting encoder is found and disable_conflicting_encoders
* is not set, an error is returned. Userspace can provide a solution
* through the atomic ioctl.
*
* If the flag is set conflicting connectors are removed from the crtc
* and the crtc is disabled if no encoder is left. This preserves
* compatibility with the legacy set_config behavior.
*/
drm_for_each_connector(connector, state->dev) {
struct drm_crtc_state *crtc_state;
@ -120,6 +149,15 @@ static int disable_conflicting_connectors(struct drm_atomic_state *state)
if (!encoder || !(encoder_mask & (1 << drm_encoder_index(encoder))))
continue;
if (!disable_conflicting_encoders) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
encoder->base.id, encoder->name,
connector->state->crtc->base.id,
connector->state->crtc->name,
connector->base.id, connector->name);
return -EINVAL;
}
conn_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(conn_state))
return PTR_ERR(conn_state);
@ -148,26 +186,6 @@ static int disable_conflicting_connectors(struct drm_atomic_state *state)
return 0;
}
static bool
check_pending_encoder_assignment(struct drm_atomic_state *state,
struct drm_encoder *new_encoder)
{
struct drm_connector *connector;
struct drm_connector_state *conn_state;
int i;
for_each_connector_in_state(state, connector, conn_state, i) {
if (conn_state->best_encoder != new_encoder)
continue;
/* encoder already assigned and we're trying to re-steal it! */
if (connector->state->best_encoder != conn_state->best_encoder)
return false;
}
return true;
}
static void
set_best_encoder(struct drm_atomic_state *state,
struct drm_connector_state *conn_state,
@ -325,13 +343,6 @@ update_connector_routing(struct drm_atomic_state *state,
return 0;
}
if (!check_pending_encoder_assignment(state, new_encoder)) {
DRM_DEBUG_ATOMIC("Encoder for [CONNECTOR:%d:%s] already assigned\n",
connector->base.id,
connector->name);
return -EINVAL;
}
ret = steal_encoder(state, new_encoder);
if (ret) {
DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
@ -510,11 +521,9 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
}
}
if (state->legacy_set_config) {
ret = disable_conflicting_connectors(state);
if (ret)
return ret;
}
ret = handle_conflicting_encoders(state, state->legacy_set_config);
if (ret)
return ret;
for_each_connector_in_state(state, connector, connector_state, i) {
/*