Commit 964893d3 authored by Jani Nikula's avatar Jani Nikula
Browse files

drm/probe-helper: add drm_connector_helper_get_modes() 



Add a helper function to be used as the "default" .get_modes()
hook. This also works as an example of what the driver .get_modes()
hooks are supposed to do regarding the new drm_edid_read*() and
drm_edid_connector_update() calls.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d985449ed4b95971490ab7c09d2d59b58a892769.1656494768.git.jani.nikula@intel.com
parent b71c0aaa

drivers/gpu/drm/drm_probe_helper.c

+34 −0
Original line number Diff line number Diff line
@@ -1049,3 +1049,37 @@ int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector) 
	return count;

}

EXPORT_SYMBOL(drm_connector_helper_get_modes_from_ddc);



/**

 * drm_connector_helper_get_modes - Read EDID and update connector.

 * @connector: The connector

 *

 * Read the EDID using drm_edid_read() (which requires that connector->ddc is

 * set), and update the connector using the EDID.

 *

 * This can be used as the "default" connector helper .get_modes() hook if the

 * driver does not need any special processing. This is sets the example what

 * custom .get_modes() hooks should do regarding EDID read and connector update.

 *

 * Returns: Number of modes.

 */

int drm_connector_helper_get_modes(struct drm_connector *connector)

{

	const struct drm_edid *drm_edid;

	int count;



	drm_edid = drm_edid_read(connector);



	/*

	 * Unconditionally update the connector. If the EDID was read

	 * successfully, fill in the connector information derived from the

	 * EDID. Otherwise, if the EDID is NULL, clear the connector

	 * information.

	 */

	count = drm_edid_connector_update(connector, drm_edid);



	drm_edid_free(drm_edid);



	return count;

}

EXPORT_SYMBOL(drm_connector_helper_get_modes);

include/drm/drm_probe_helper.h

+1 −0
Original line number Diff line number Diff line
@@ -27,5 +27,6 @@ void drm_kms_helper_poll_enable(struct drm_device *dev); 
bool drm_kms_helper_is_poll_worker(void);



int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector);

int drm_connector_helper_get_modes(struct drm_connector *connector);



#endif