diff options
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_crtc_helper.c | 66 |
2 files changed, 46 insertions, 24 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 9a4c06ddebd..b501aa7528d 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -2096,6 +2096,10 @@ void intel_crt_init(struct drm_device *dev) </listitem> </itemizedlist> </sect2> + <sect2> + <title>Modeset Helper Functions Reference</title> +!Edrivers/gpu/drm/drm_crtc_helper.c + </sect2> </sect1> <!-- Internals: vertical blanking --> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index 1fe719fb32e..7b2d378b257 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -39,6 +39,17 @@ #include <drm/drm_fb_helper.h> #include <drm/drm_edid.h> +/** + * drm_helper_move_panel_connectors_to_head() - move panels to the front in the + * connector list + * @dev: drm device to operate on + * + * Some userspace presumes that the first connected connector is the main + * display, where it's supposed to display e.g. the login screen. For + * laptops, this should be the main panel. Use this function to sort all + * (eDP/LVDS) panels to the front of the connector list, instead of + * painstakingly trying to initialize them in the right order. + */ void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) { struct drm_connector *connector, *tmp; @@ -82,22 +93,21 @@ static void drm_mode_validate_flag(struct drm_connector *connector, /** * drm_helper_probe_single_connector_modes - get complete set of display modes - * @dev: DRM device + * @connector: connector to probe * @maxX: max width for modes * @maxY: max height for modes * * LOCKING: * Caller must hold mode config lock. * - * Based on @dev's mode_config layout, scan all the connectors and try to detect - * modes on them. Modes will first be added to the connector's probed_modes - * list, then culled (based on validity and the @maxX, @maxY parameters) and - * put into the normal modes list. - * - * Intended to be used either at bootup time or when major configuration - * changes have occurred. + * Based on the helper callbacks implemented by @connector try to detect all + * valid modes. Modes will first be added to the connector's probed_modes list, + * then culled (based on validity and the @maxX, @maxY parameters) and put into + * the normal modes list. * - * FIXME: take into account monitor limits + * Intended to be use as a generic implementation of the ->probe() @connector + * callback for drivers that use the crtc helpers for output mode filtering and + * detection. * * RETURNS: * Number of modes found on @connector. @@ -348,17 +358,24 @@ drm_crtc_prepare_encoders(struct drm_device *dev) } /** - * drm_crtc_set_mode - set a mode + * drm_crtc_helper_set_mode - internal helper to set a mode * @crtc: CRTC to program * @mode: mode to use * @x: horizontal offset into the surface * @y: vertical offset into the surface + * @old_fb: old framebuffer, for cleanup * * LOCKING: * Caller must hold mode config lock. * * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance - * to fixup or reject the mode prior to trying to set it. + * to fixup or reject the mode prior to trying to set it. This is an internal + * helper that drivers could e.g. use to update properties that require the + * entire output pipe to be disabled and re-enabled in a new configuration. For + * example for changing whether audio is enabled on a hdmi link or for changing + * panel fitter or dither attributes. It is also called by the + * drm_crtc_helper_set_config() helper function to drive the mode setting + * sequence. * * RETURNS: * True if the mode was set successfully, or false otherwise. @@ -514,20 +531,19 @@ drm_crtc_helper_disable(struct drm_crtc *crtc) /** * drm_crtc_helper_set_config - set a new config from userspace - * @crtc: CRTC to setup - * @crtc_info: user provided configuration - * @new_mode: new mode to set - * @connector_set: set of connectors for the new config - * @fb: new framebuffer + * @set: mode set configuration * * LOCKING: * Caller must hold mode config lock. * - * Setup a new configuration, provided by the user in @crtc_info, and enable - * it. + * Setup a new configuration, provided by the upper layers (either an ioctl call + * from userspace or internally e.g. from the fbdev suppport code) in @set, and + * enable it. This is the main helper functions for drivers that implement + * kernel mode setting with the crtc helper functions and the assorted + * ->prepare(), ->modeset() and ->commit() helper callbacks. * * RETURNS: - * Zero. (FIXME) + * Returns 0 on success, -ERRNO on failure. */ int drm_crtc_helper_set_config(struct drm_mode_set *set) { @@ -823,12 +839,14 @@ static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) } /** - * drm_helper_connector_dpms - * @connector affected connector - * @mode DPMS mode + * drm_helper_connector_dpms() - connector dpms helper implementation + * @connector: affected connector + * @mode: DPMS mode * - * Calls the low-level connector DPMS function, then - * calls appropriate encoder and crtc DPMS functions as well + * This is the main helper function provided by the crtc helper framework for + * implementing the DPMS connector attribute. It computes the new desired DPMS + * state for all encoders and crtcs in the output mesh and calls the ->dpms() + * callback provided by the driver appropriately. */ void drm_helper_connector_dpms(struct drm_connector *connector, int mode) { |