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Commit 6a0d9528 authored by Lukas Wunner's avatar Lukas Wunner Committed by Daniel Vetter
Browse files

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: default avatarLukas Wunner <lukas@wunner.de>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 6ce62d8b

drivers/gpu/drm/drm_crtc.c

+45 −0
Original line number Diff line number Diff line
@@ -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 =

include/drm/drm_crtc.h

+2 −0
Original line number Diff line number Diff line
@@ -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);