[PATCH 1/6] drm/atomic: add connectors_changed to separate it from mode_changed, v2

Maarten Lankhorst
2015-07-21T11:28:57Z

This can be a separate case from mode_changed, when connectors stay the
same but only the mode is different. Drivers may choose to implement specific
optimizations to prevent a full modeset for this case.

Changes since v1:
- Update kerneldocs slightly.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 39 +++++++++++++++++++++++++++---------
drivers/gpu/drm/i915/intel_display.c | 2 +-
include/drm/drm_atomic.h | 3 ++-
include/drm/drm_crtc.h | 8 +++++---
4 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 0ea8c5d476ef..ac6601071414 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -124,7 +124,7 @@ steal_encoder(struct drm_atomic_state *state,
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);

- crtc_state->mode_changed = true;
+ crtc_state->connectors_changed = true;

list_for_each_entry(connector, &config->connector_list, head) {
if (connector->state->best_encoder != encoder)
@@ -174,14 +174,14 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx)
idx = drm_crtc_index(connector->state->crtc);

crtc_state = state->crtc_states[idx];
- crtc_state->mode_changed = true;
+ crtc_state->connectors_changed = true;
}

if (connector_state->crtc) {
idx = drm_crtc_index(connector_state->crtc);

crtc_state = state->crtc_states[idx];
- crtc_state->mode_changed = true;
+ crtc_state->connectors_changed = true;
}
}

@@ -233,7 +233,7 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx)
idx = drm_crtc_index(connector_state->crtc);

crtc_state = state->crtc_states[idx];
- crtc_state->mode_changed = true;
+ crtc_state->connectors_changed = true;

DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
connector->base.id,
@@ -256,7 +256,8 @@ mode_fixup(struct drm_atomic_state *state)
bool ret;

for_each_crtc_in_state(state, crtc, crtc_state, i) {
- if (!crtc_state->mode_changed)
+ if (!crtc_state->mode_changed &&
+ !crtc_state->connectors_changed)
continue;

drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
@@ -312,7 +313,8 @@ mode_fixup(struct drm_atomic_state *state)
for_each_crtc_in_state(state, crtc, crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;

- if (!crtc_state->mode_changed)
+ if (!crtc_state->mode_changed &&
+ !crtc_state->connectors_changed)
continue;

funcs = crtc->helper_private;
@@ -338,9 +340,14 @@ mode_fixup(struct drm_atomic_state *state)
*
* Check the state object to see if the requested state is physically possible.
* This does all the crtc and connector related computations for an atomic
- * update. It computes and updates crtc_state->mode_changed, adds any additional
- * connectors needed for full modesets and calls down into ->mode_fixup
- * functions of the driver backend.
+ * update and adds any additional connectors needed for full modesets and calls
+ * down into ->mode_fixup functions of the driver backend.
+ *
+ * crtc_state->mode_changed is set when the input mode is changed.
+ * crtc_state->connectors_changed is set when a connector is added or
+ * removed from the crtc.
+ * crtc_state->active_changed is set when crtc_state->active changes,
+ * which is used for dpms.
*
* IMPORTANT:
*
@@ -373,7 +380,17 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
if (crtc->state->enable != crtc_state->enable) {
DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
crtc->base.id);
+
+ /*
+ * For clarity this assignment is done here, but
+ * enable == 0 is only true when there are no
+ * connectors and a NULL mode.
+ *
+ * The other way around is true as well. enable != 0
+ * iff connectors are attached and a mode is set.
+ */
crtc_state->mode_changed = true;
+ crtc_state->connectors_changed = true;
}
}

@@ -448,6 +465,9 @@ EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
* This does all the plane update related checks using by calling into the
* ->atomic_check hooks provided by the driver.
*
+ * It also sets crtc_state->planes_changed to indicate that a crtc has
+ * updated planes.
+ *
* RETURNS
* Zero for success or -errno
*/
@@ -2081,6 +2101,7 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
state->mode_changed = false;
state->active_changed = false;
state->planes_changed = false;
+ state->connectors_changed = false;
state->event = NULL;
}
EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6867267115ce..671ca2820f82 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -413,7 +413,7 @@ static const intel_limit_t intel_limits_bxt = {
static bool
needs_modeset(struct drm_crtc_state *state)
{
- return state->mode_changed || state->active_changed;
+ return drm_atomic_crtc_needs_modeset(state);
}

/**
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 8a3a913320eb..e67aeac2aee0 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -166,7 +166,8 @@ int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
static inline bool
drm_atomic_crtc_needs_modeset(struct drm_crtc_state *state)
{
- return state->mode_changed || state->active_changed;
+ return state->mode_changed || state->active_changed ||
+ state->connectors_changed;
}

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 8159a0627b6b..3628bd89abf6 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -255,12 +255,13 @@ struct drm_atomic_state;
* @crtc: backpointer to the CRTC
* @enable: whether the CRTC should be enabled, gates all other state
* @active: whether the CRTC is actively displaying (used for DPMS)
- * @mode_changed: for use by helpers and drivers when computing state updates
- * @active_changed: for use by helpers and drivers when computing state updates
+ * @planes_changed: planes on this crtc are updated
+ * @mode_changed: crtc_state->mode or crtc_state->enable has been changed
+ * @active_changed: crtc_state->active has been toggled.
+ * @connectors_changed: connectors to this crtc have been updated
* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
* @last_vblank_count: for helpers and drivers to capture the vblank of the
* update to ensure framebuffer cleanup isn't done too early
- * @planes_changed: for use by helpers and drivers when computing state updates
* @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
* @mode: current mode timings
* @event: optional pointer to a DRM event to signal upon completion of the
@@ -283,6 +284,7 @@ struct drm_crtc_state {
bool planes_changed : 1;
bool mode_changed : 1;
bool active_changed : 1;
+ bool connectors_changed : 1;

/* attached planes bitmask:
* WARNING: transitional helpers do not maintain plane_mask so
--
2.1.0