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 --- drivers/gpu/drm/drm_crtc.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_crtc.h | 2 ++ 2 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 37427b2..1edc1f4 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -426,6 +426,51 @@ 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 = diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index d1559cd..c192f2c 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -2326,6 +2326,8 @@ extern int drm_crtc_check_viewport(const struct drm_crtc *crtc, int x, int y, const struct drm_display_mode *mode, const struct drm_framebuffer *fb); +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);