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drm: Add helpers to turn off CRTCs 

Turning off a single CRTC or all active CRTCs of a DRM device is a
fairly common pattern. Add helpers to avoid open coding this everywhere.

The name was chosen to be consistent with drm_plane_force_disable().

Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Lukas Wunner 2016-06-08 18:47:27 +02:00 committed by Daniel Vetter
parent 6ce62d8b6f
commit 6a0d952850
2 changed files with 47 additions and 0 deletions
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45
drivers/gpu/drm/drm_crtc.c
View File

@ -396,6 +396,51 @@ void drm_mode_object_reference(struct drm_mode_object *obj)
}
EXPORT_SYMBOL(drm_mode_object_reference);
/**
* drm_crtc_force_disable - Forcibly turn off a CRTC
* @crtc: CRTC to turn off
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_crtc_force_disable(struct drm_crtc *crtc)
{
struct drm_mode_set set = {
.crtc = crtc,
};
return drm_mode_set_config_internal(&set);
}
EXPORT_SYMBOL(drm_crtc_force_disable);
/**
* drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
* @dev: DRM device whose CRTCs to turn off
*
* Drivers may want to call this on unload to ensure that all displays are
* unlit and the GPU is in a consistent, low power state. Takes modeset locks.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_crtc_force_disable_all(struct drm_device *dev)
{
struct drm_crtc *crtc;
int ret = 0;
drm_modeset_lock_all(dev);
drm_for_each_crtc(crtc, dev)
if (crtc->enabled) {
ret = drm_crtc_force_disable(crtc);
if (ret)
goto out;
}
out:
drm_modeset_unlock_all(dev);
return ret;
}
EXPORT_SYMBOL(drm_crtc_force_disable_all);
static void drm_framebuffer_free(struct kref *kref)
{
struct drm_framebuffer *fb =

2
include/drm/drm_crtc.h
View File

@ -2654,6 +2654,8 @@ extern struct drm_plane * drm_plane_from_index(struct drm_device *dev, int idx);
extern void drm_plane_force_disable(struct drm_plane *plane);
extern void drm_crtc_get_hv_timing(const struct drm_display_mode *mode,
int *hdisplay, int *vdisplay);
extern int drm_crtc_force_disable(struct drm_crtc *crtc);
extern int drm_crtc_force_disable_all(struct drm_device *dev);
extern void drm_encoder_cleanup(struct drm_encoder *encoder);