This is the infrastructure for DPMS ported to the atomic world.
Fundamental changes compare to legacy DPMS are:
- No more per-connector dpms state, instead there's just one per each
display pipeline. So if you clone either you have to unclone first
if you only want to switch off one screen, or you just switch of
everything (like all desktops do). This massively reduces complexity
for cloning since now there's no more half-enabled cloned configs to
consider.
- Only on/off, dpms standby/suspend are as dead as real CRTs. Again
reduces complexity a lot.
Now especially for backwards compat the really important part for dpms
support is that dpms on always succeeds (except for hw death and
unplugged cables ofc). Which means everything that could fail (like
configuration checking, resources assignments and buffer management)
must be done irrespective from ->active. ->active is really only a
toggle to change the hardware state. More precisely:
- Drivers MUST NOT look at ->active in their ->atomic_check callbacks.
Changes to ->active MUST always suceed if nothing else changes.
- Drivers using the atomic helpers MUST NOT look at ->active anywhere,
period. The helpers will take care of calling the respective
enable/modeset/disable hooks as necessary. As before the helpers
will carefully keep track of the state and not call any hooks
unecessarily, so still no double-disables or enables like with crtc
helpers.
- ->mode_set hooks are only called when the mode or output
configuration changes, not for changes in ->active state.
- Drivers which reconstruct the state objects in their ->reset hooks
or through some other hw state readout infrastructure must ensure
that ->active reflects actual hw state.
This just implements the core bits and helper logic, a subsequent
patch will implement the helper code to implement legacy dpms with
this.
v2: Rebase on top of the drm ioctl work:
- Move crtc checks to the core check function.
- Also check for ->active_changed when deciding whether a modeset
might happen (for the ALLOW_MODESET mode).
- Expose the ->active state with an atomic prop.
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/drm_atomic.c | 18 +++++++++++--
drivers/gpu/drm/drm_atomic_helper.c | 51 +++++++++++++++++++++++++++++++++----
drivers/gpu/drm/drm_crtc.c | 10 ++++++++
include/drm/drm_crtc.h | 3 +++
4 files changed, 75 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 1e38dfc8e462..ee68267bb326 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -241,7 +241,13 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
struct drm_crtc_state *state, struct drm_property *property,
uint64_t val)
{
- if (crtc->funcs->atomic_set_property)
+ struct drm_device *dev = crtc->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+
+ /* FIXME: Mode prop is missing, which also controls ->enable. */
+ if (property == config->prop_active) {
+ state->active = val;
+ } else if (crtc->funcs->atomic_set_property)
return crtc->funcs->atomic_set_property(crtc, state, property, val);
return -EINVAL;
}
@@ -282,6 +288,13 @@ static int drm_atomic_crtc_check(struct drm_crtc *crtc,
*
* TODO: Add generic modeset state checks once we support those.
*/
+
+ if (state->active && !state->enable) {
+ DRM_DEBUG_KMS("[CRTC:%d] active without enabled\n",
+ crtc->base.id);
+ return -EINVAL;
+ }
+
return 0;
}
@@ -976,7 +989,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
if (!crtc)
continue;
- if (crtc_state->mode_changed) {
+ if (crtc_state->mode_changed ||
+ crtc_state->active_changed) {
DRM_DEBUG_KMS("[CRTC:%d] requires full modeset\n",
crtc->base.id);
return -EINVAL;
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 541ba833ed36..a48f5c9690d5 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -404,12 +404,28 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
crtc = state->crtcs[i];
crtc_state = state->crtc_states[i];
- if (!crtc || !crtc_state->mode_changed)
+ if (!crtc)
continue;
- DRM_DEBUG_KMS("[CRTC:%d] needs full modeset, enable: %c\n",
+ /*
+ * We must set ->active_changed after walking connectors for
+ * otherwise and an update that only changes active would result
+ * in a full modeset because update_connector_routing force
+ * that.
+ */
+ if (crtc->state->active != crtc_state->active) {
+ DRM_DEBUG_KMS("[CRTC:%d] active changed\n",
+ crtc->base.id);
+ crtc_state->active_changed = true;
+ }
+
+ if (!(crtc->state->mode_changed || crtc->state->active_changed))
+ continue;
+
+ DRM_DEBUG_KMS("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
crtc->base.id,
- crtc_state->enable ? 'y' : 'n');
+ crtc_state->enable ? 'y' : 'n',
+ crtc_state->active ? 'y' : 'n');
ret = drm_atomic_add_affected_connectors(state, crtc);
if (ret != 0)
@@ -545,6 +561,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
struct drm_connector *connector;
struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
+ struct drm_crtc_state *old_crtc_state;
old_conn_state = old_state->connector_states[i];
connector = old_state->connectors[i];
@@ -554,6 +571,11 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
if (!old_conn_state || !old_conn_state->crtc)
continue;
+ old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
+
+ if (!old_crtc_state->active)
+ continue;
+
encoder = old_conn_state->best_encoder;
/* We shouldn't get this far if we didn't previously have
@@ -586,11 +608,17 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
for (i = 0; i < ncrtcs; i++) {
struct drm_crtc_helper_funcs *funcs;
struct drm_crtc *crtc;
+ struct drm_crtc_state *old_crtc_state;
crtc = old_state->crtcs[i];
+ old_crtc_state = old_state->crtc_states[i];
/* Shut down everything that needs a full modeset. */
- if (!crtc || !crtc->state->mode_changed)
+ if (!crtc ||
+ !(crtc->state->mode_changed || crtc->state->active_changed))
+ continue;
+
+ if (!old_crtc_state->active)
continue;
funcs = crtc->helper_private;
@@ -697,6 +725,9 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
mode = &new_crtc_state->mode;
adjusted_mode = &new_crtc_state->adjusted_mode;
+ if (!new_crtc_state->mode_changed)
+ continue;
+
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call call mode_set hooks twice.
@@ -749,7 +780,11 @@ void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
crtc = old_state->crtcs[i];
/* Need to filter out CRTCs where only planes change. */
- if (!crtc || !crtc->state->mode_changed)
+ if (!crtc ||
+ !(crtc->state->mode_changed || crtc->state->active_changed))
+ continue;
+
+ if (!crtc->state->active)
continue;
funcs = crtc->helper_private;
@@ -768,6 +803,9 @@ void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
if (!connector || !connector->state->best_encoder)
continue;
+ if (!connector->state->crtc->state->active)
+ continue;
+
encoder = connector->state->best_encoder;
funcs = encoder->helper_private;
@@ -1518,6 +1556,7 @@ retry:
WARN_ON(set->num_connectors);
crtc_state->enable = false;
+ crtc_state->active = false;
ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
if (ret != 0)
@@ -1532,6 +1571,7 @@ retry:
WARN_ON(!set->num_connectors);
crtc_state->enable = true;
+ crtc_state->active = true;
drm_mode_copy(&crtc_state->mode, set->mode);
ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
@@ -1894,6 +1934,7 @@ drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
if (state) {
state->mode_changed = false;
+ state->active_changed = false;
state->planes_changed = false;
state->event = NULL;
}
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index c0941f0024b6..2a11da3d476f 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -691,6 +691,10 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
if (cursor)
cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
+ if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+ drm_object_attach_property(&crtc->base, config->prop_active, 0);
+ }
+
return 0;
}
EXPORT_SYMBOL(drm_crtc_init_with_planes);
@@ -1391,6 +1395,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.prop_crtc_id = prop;
+ prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
+ "ACTIVE");
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.prop_active = prop;
+
return 0;
}
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 8022ab11958a..4d3f3b874dd6 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -249,6 +249,7 @@ struct drm_atomic_state;
* @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
* @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
@@ -274,6 +275,7 @@ struct drm_crtc_state {
/* computed state bits used by helpers and drivers */
bool planes_changed : 1;
bool mode_changed : 1;
+ bool active_changed : 1;
/* attached planes bitmask:
* WARNING: transitional helpers do not maintain plane_mask so
@@ -1128,6 +1130,7 @@ struct drm_mode_config {
struct drm_property *prop_crtc_h;
struct drm_property *prop_fb_id;
struct drm_property *prop_crtc_id;
+ struct drm_property *prop_active;
/* DVI-I properties */
struct drm_property *dvi_i_subconnector_property;
--
2.1.4
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