diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2022-06-29 12:27:51 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-06-30 10:51:03 +0300 |
| commit | 964893d3caff6bc39f6cf5cb7d90fd78a810c535 (patch) | |
| tree | 4f69d633b5de02c0f1e3f01e22fd1680abdce254 /drivers/gpu/drm/drm_probe_helper.c | |
| parent | b71c0aaab9ef1054155a075cf5e8a1db7b37ca5f (diff) | |
| download | linux-964893d3caff6bc39f6cf5cb7d90fd78a810c535.tar.bz2 | |
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
Diffstat (limited to 'drivers/gpu/drm/drm_probe_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_probe_helper.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index a8d26b29bfa0..bb427c5a4f1f 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -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); |