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// SPDX-License-Identifier: GPL-2.0-or-later
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_helper.h>
#include <drm/drm_modeset_lock.h>
/**
* drm_bridge_helper_reset_crtc - Reset the pipeline feeding a bridge
* @bridge: DRM bridge to reset
* @ctx: lock acquisition context
*
* Reset a @bridge pipeline. It will power-cycle all active components
* between the CRTC and connector that bridge is connected to.
*
* As it relies on drm_atomic_helper_reset_crtc(), the same limitations
* apply.
*
* Returns:
*
* 0 on success or a negative error code on failure. If the error
* returned is EDEADLK, the whole atomic sequence must be restarted.
*/
int drm_bridge_helper_reset_crtc(struct drm_bridge *bridge,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_connector *connector;
struct drm_encoder *encoder = bridge->encoder;
struct drm_device *dev = encoder->dev;
struct drm_crtc *crtc;
int ret;
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
if (ret)
return ret;
connector = drm_atomic_get_connector_for_encoder(encoder, ctx);
if (IS_ERR(connector)) {
ret = PTR_ERR(connector);
goto out;
}
if (!connector->state) {
ret = -EINVAL;
goto out;
}
crtc = connector->state->crtc;
ret = drm_atomic_helper_reset_crtc(crtc, ctx);
if (ret)
goto out;
out:
drm_modeset_unlock(&dev->mode_config.connection_mutex);
return ret;
}
EXPORT_SYMBOL(drm_bridge_helper_reset_crtc);
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