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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: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d985449ed4b95971490ab7c09d2d59b58a892769.1656494768.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2022-06-29 12:27:51 +03:00
parent b71c0aaab9
commit 964893d3ca
2 changed files with 35 additions and 0 deletions
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34
drivers/gpu/drm/drm_probe_helper.c
View File

@ -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);

1
include/drm/drm_probe_helper.h
View File

@ -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