Add a blob property tracking the current mode to the CRTC state, and
ensure it is properly updated and referenced.
Signed-off-by: Daniel Stone <daniels@xxxxxxxxxxxxx>
Tested-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/drm_atomic.c | 62 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_atomic_helper.c | 11 ++++---
drivers/gpu/drm/drm_crtc.c | 3 +-
include/drm/drm_crtc.h | 3 ++
4 files changed, 73 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 67c251f..63fc58a 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -301,6 +301,8 @@ 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 && !state->enable)
return 0;
@@ -308,9 +310,20 @@ int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
memcmp(&state->mode, mode, sizeof(*mode)) == 0)
return 0;
+ if (state->mode_blob)
+ drm_property_unreference_blob(state->mode_blob);
+ state->mode_blob = NULL;
state->mode_changed = true;
if (mode) {
+ drm_mode_convert_to_umode(&umode, mode);
+ state->mode_blob =
+ drm_property_create_blob(state->crtc->dev,
+ sizeof(umode),
+ &umode);
+ if (!state->mode_blob)
+ return -ENOMEM;
+
drm_mode_copy(&state->mode, mode);
state->enable = true;
} else {
@@ -330,6 +343,55 @@ int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
}
EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
+/**
+ * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
+ * @state: the CRTC whose incoming state to update
+ * @blob: pointer to blob property to use for mode
+ *
+ * Set a mode (originating from a blob property) on the desired CRTC state.
+ * This function will take a reference on the blob property for the CRTC state,
+ * and release the reference held on the state's existing mode property, if any
+ * was set.
+ */
+int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
+ struct drm_property_blob *blob)
+{
+ if (blob == state->mode_blob)
+ return 0;
+
+ if (state->mode_blob)
+ drm_property_unreference_blob(state->mode_blob);
+ state->mode_blob = NULL;
+
+ if (blob) {
+ if (blob->length != sizeof(struct drm_mode_modeinfo) ||
+ drm_mode_convert_umode(&state->mode,
+ (const struct drm_mode_modeinfo *)
+ blob->data))
+ return -EINVAL;
+
+ state->mode_blob = drm_property_reference_blob(blob);
+ state->mode_changed = true;
+ state->enable = true;
+ } else {
+ memset(&state->mode, 0, sizeof(state->mode));
+
+ if (state->enable)
+ state->mode_changed = true;
+ state->enable = false;
+ state->active = false;
+ }
+
+ if (state->enable)
+ DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
+ state->mode.name, state);
+ else
+ DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
+ state);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
/**
* drm_atomic_crtc_set_property - set property on CRTC
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 70ce243..5d596d9 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2027,6 +2027,8 @@ 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);
@@ -2048,6 +2050,8 @@ 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;
@@ -2090,11 +2094,8 @@ 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);
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 9263b22..ee87045 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1961,7 +1961,8 @@ int drm_mode_getcrtc(struct drm_device *dev,
crtc_resp->x = crtc->primary->state->src_x >> 16;
crtc_resp->y = crtc->primary->state->src_y >> 16;
if (crtc->state->enable) {
- drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
+ memcpy(&crtc_resp->mode, &crtc->state->mode_blob->data,
+ sizeof(crtc_resp->mode));
crtc_resp->mode_valid = 1;
} else {
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 72b60db..c54fa4a 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -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;
--
2.4.1
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