linux-imx

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/component.h>

#include <linux/export.h>

#include <linux/list.h>

#include <linux/of_graph.h>

#include <drm/drmP.h>

#include <drm/drm_bridge.h>

#include <drm/drm_crtc.h>

#include <drm/drm_encoder.h>

#include <drm/drm_panel.h>

#include <drm/drm_of.h>

​

/**

 * DOC: overview

 *

 * A set of helper functions to aid DRM drivers in parsing standard DT

 * properties.

 */

​

static void drm_release_of(struct device *dev, void *data)

{

    of_node_put(data);

}

​

/**

 * drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node

 * @dev: DRM device

 * @port: port OF node

 *

 * Given a port OF node, return the possible mask of the corresponding

 * CRTC within a device's list of CRTCs.  Returns zero if not found.

 */

uint32_t drm_of_crtc_port_mask(struct drm_device *dev,

                struct device_node *port)

{

    unsigned int index = 0;

    struct drm_crtc *tmp;

​

    drm_for_each_crtc(tmp, dev) {

        if (tmp->port == port)

            return 1 << index;

​

        index++;

    }

​

    return 0;

}

EXPORT_SYMBOL(drm_of_crtc_port_mask);

​

/**

 * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port

 * @dev: DRM device

 * @port: encoder port to scan for endpoints

 *

 * Scan all endpoints attached to a port, locate their attached CRTCs,

 * and generate the DRM mask of CRTCs which may be attached to this

 * encoder.

 *

 * See Documentation/devicetree/bindings/graph.txt for the bindings.

 */

uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,

                    struct device_node *port)

{