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drm/client: Add drm_client_modeset_check() 

Add a way for client to check the configuration before comitting.

v2:
- Fix docs (Sam)

Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200509141619.32970-5-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2020-05-09 16:16:13 +02:00
parent c9c03e3cf0
commit 64593f2a6f
2 changed files with 32 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/drm_client_modeset.c
View File

@ -969,7 +969,7 @@ bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
}
EXPORT_SYMBOL(drm_client_rotation);
static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active)
static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
{
struct drm_device *dev = client->dev;
struct drm_plane *plane;
@ -1036,7 +1036,10 @@ retry:
}
}
ret = drm_atomic_commit(state);
if (check)
ret = drm_atomic_check_only(state);
else
ret = drm_atomic_commit(state);
out_state:
if (ret == -EDEADLK)
@ -1097,6 +1100,30 @@ out:
return ret;
}
/**
* drm_client_modeset_check() - Check modeset configuration
* @client: DRM client
*
* Check modeset configuration.
*
* Returns:
* Zero on success or negative error code on failure.
*/
int drm_client_modeset_check(struct drm_client_dev *client)
{
int ret;
if (!drm_drv_uses_atomic_modeset(client->dev))
return 0;
mutex_lock(&client->modeset_mutex);
ret = drm_client_modeset_commit_atomic(client, true, true);
mutex_unlock(&client->modeset_mutex);
return ret;
}
EXPORT_SYMBOL(drm_client_modeset_check);
/**
* drm_client_modeset_commit_locked() - Force commit CRTC configuration
* @client: DRM client
@ -1115,7 +1142,7 @@ int drm_client_modeset_commit_locked(struct drm_client_dev *client)
mutex_lock(&client->modeset_mutex);
if (drm_drv_uses_atomic_modeset(dev))
ret = drm_client_modeset_commit_atomic(client, true);
ret = drm_client_modeset_commit_atomic(client, true, false);
else
ret = drm_client_modeset_commit_legacy(client);
mutex_unlock(&client->modeset_mutex);
@ -1191,7 +1218,7 @@ int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
mutex_lock(&client->modeset_mutex);
if (drm_drv_uses_atomic_modeset(dev))
ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON);
ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
else
drm_client_modeset_dpms_legacy(client, mode);
mutex_unlock(&client->modeset_mutex);

1
include/drm/drm_client.h
View File

@ -162,6 +162,7 @@ int drm_client_modeset_create(struct drm_client_dev *client);
void drm_client_modeset_free(struct drm_client_dev *client);
int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height);
bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation);
int drm_client_modeset_check(struct drm_client_dev *client);
int drm_client_modeset_commit_locked(struct drm_client_dev *client);
int drm_client_modeset_commit(struct drm_client_dev *client);
int drm_client_modeset_dpms(struct drm_client_dev *client, int mode);