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drm/atomic: Add current-mode blob to CRTC state

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Add a blob property tracking the current mode to the CRTC state, and
ensure it is properly updated and referenced.

v2: Continue using crtc_state->mode inside getcrtc, instead of reading
    out the mode blob. Use IS_ERR and PTR_ERR from create_blob. Move
    set_mode_prop_for_crtc to later patch where it actually gets used.
    Enforce !!state->enable == !!state->mode_blob inside
    drm_atomic_crtc_check.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Tested-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Stone 2015-05-25 19:11:51 +01:00 committed by Daniel Vetter
parent 819364da20
commit 99cf4a29fa
3 changed files with 40 additions and 6 deletions
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32
drivers/gpu/drm/drm_atomic.c
View file

@ -304,11 +304,25 @@ EXPORT_SYMBOL(drm_atomic_get_crtc_state);
int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
struct drm_display_mode *mode)
{
struct drm_mode_modeinfo umode;
/* Early return for no change. */
if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
return 0;
if (state->mode_blob)
drm_property_unreference_blob(state->mode_blob);
state->mode_blob = NULL;
if (mode) {
drm_mode_convert_to_umode(&umode, mode);
state->mode_blob =
drm_property_create_blob(state->crtc->dev,
sizeof(umode),
&umode);
if (IS_ERR(state->mode_blob))
return PTR_ERR(state->mode_blob);
drm_mode_copy(&state->mode, mode);
state->enable = true;
DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
@ -324,7 +338,6 @@ int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
}
EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
/**
* drm_atomic_crtc_set_property - set property on CRTC
* @crtc: the drm CRTC to set a property on
@ -410,6 +423,23 @@ static int drm_atomic_crtc_check(struct drm_crtc *crtc,
return -EINVAL;
}
/* The state->enable vs. state->mode_blob checks can be WARN_ON,
* as this is a kernel-internal detail that userspace should never
* be able to trigger. */
if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
WARN_ON(state->enable && !state->mode_blob)) {
DRM_DEBUG_ATOMIC("[CRTC:%d] enabled without mode blob\n",
crtc->base.id);
return -EINVAL;
}
if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
WARN_ON(!state->enable && state->mode_blob)) {
DRM_DEBUG_ATOMIC("[CRTC:%d] disabled with mode blob\n",
crtc->base.id);
return -EINVAL;
}
return 0;
}

11
drivers/gpu/drm/drm_atomic_helper.c
View file

@ -2044,6 +2044,8 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
*/
void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
{
if (crtc->state && crtc->state->mode_blob)
drm_property_unreference_blob(crtc->state->mode_blob);
kfree(crtc->state);
crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
@ -2065,6 +2067,8 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
{
memcpy(state, crtc->state, sizeof(*state));
if (state->mode_blob)
drm_property_reference_blob(state->mode_blob);
state->mode_changed = false;
state->active_changed = false;
state->planes_changed = false;
@ -2107,11 +2111,8 @@ EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
/*
* This is currently a placeholder so that drivers that subclass the
* state will automatically do the right thing if code is ever added
* to this function.
*/
if (state->mode_blob)
drm_property_unreference_blob(state->mode_blob);
}
EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);

3
include/drm/drm_crtc.h
View file

@ -299,6 +299,9 @@ struct drm_crtc_state {
struct drm_display_mode mode;
/* blob property to expose current mode to atomic userspace */
struct drm_property_blob *mode_blob;
struct drm_pending_vblank_event *event;
struct drm_atomic_state *state;