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drm: kerneldoc polish for drm_crtc_helper.c
Most of this is newly added kerneldoc for the hotplug and output polling code. But I've also thrown in a bit lesser polish, most of it is tuning down the shouting RETURN: headers. Overview documentation for the output probing and mode setting support code will be added in later patches. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Daniel Vetter
parent
00d762cbd1
commit
3fcc42e07c
@ -114,8 +114,8 @@ static void drm_mode_validate_flag(struct drm_connector *connector,
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* @connector vfunc for drivers that use the crtc helpers for output mode
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* filtering and detection.
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*
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* RETURNS:
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* Number of modes found on @connector.
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* Returns:
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* The number of modes found on @connector.
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*/
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int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
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uint32_t maxX, uint32_t maxY)
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@ -217,10 +217,12 @@ EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
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* drm_helper_encoder_in_use - check if a given encoder is in use
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* @encoder: encoder to check
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*
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* Walk @encoders's DRM device's mode_config and see if it's in use.
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* Checks whether @encoder is with the current mode setting output configuration
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* in use by any connector. This doesn't mean that it is actually enabled since
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* the DPMS state is tracked separately.
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*
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* RETURNS:
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* True if @encoder is part of the mode_config, false otherwise.
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* Returns:
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* True if @encoder is used, false otherwise.
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*/
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bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
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{
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@ -239,10 +241,12 @@ EXPORT_SYMBOL(drm_helper_encoder_in_use);
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* drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
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* @crtc: CRTC to check
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*
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* Walk @crtc's DRM device's mode_config and see if it's in use.
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* Checks whether @crtc is with the current mode setting output configuration
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* in use by any connector. This doesn't mean that it is actually enabled since
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* the DPMS state is tracked separately.
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*
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* RETURNS:
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* True if @crtc is part of the mode_config, false otherwise.
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* Returns:
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* True if @crtc is used, false otherwise.
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*/
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bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
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{
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@ -278,8 +282,11 @@ drm_encoder_disable(struct drm_encoder *encoder)
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* drm_helper_disable_unused_functions - disable unused objects
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* @dev: DRM device
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*
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* If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
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* by calling its dpms function, which should power it off.
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* This function walks through the entire mode setting configuration of @dev. It
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* will remove any crtc links of unused encoders and encoder links of
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* disconnected connectors. Then it will disable all unused encoders and crtcs
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* either by calling their disable callback if available or by calling their
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* dpms callback with DRM_MODE_DPMS_OFF.
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*/
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void drm_helper_disable_unused_functions(struct drm_device *dev)
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{
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@ -358,8 +365,8 @@ drm_crtc_prepare_encoders(struct drm_device *dev)
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* drm_crtc_helper_set_config() helper function to drive the mode setting
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* sequence.
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*
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* RETURNS:
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* True if the mode was set successfully, or false otherwise.
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* Returns:
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* True if the mode was set successfully, false otherwise.
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*/
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bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
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struct drm_display_mode *mode,
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@ -559,8 +566,8 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
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* kernel mode setting with the crtc helper functions and the assorted
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* ->prepare(), ->modeset() and ->commit() helper callbacks.
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*
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* RETURNS:
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* Returns 0 on success, -ERRNO on failure.
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* Returns:
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* Returns 0 on success, negative errno numbers on failure.
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*/
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int drm_crtc_helper_set_config(struct drm_mode_set *set)
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{
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@ -916,6 +923,14 @@ void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
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}
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EXPORT_SYMBOL(drm_helper_connector_dpms);
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/**
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* drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
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* @fb: drm_framebuffer object to fill out
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* @mode_cmd: metadata from the userspace fb creation request
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*
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* This helper can be used in a drivers fb_create callback to pre-fill the fb's
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* metadata fields.
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*/
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void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
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struct drm_mode_fb_cmd2 *mode_cmd)
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{
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@ -998,6 +1013,22 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
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}
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EXPORT_SYMBOL(drm_helper_resume_force_mode);
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/**
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* drm_kms_helper_hotplug_event - fire off KMS hotplug events
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* @dev: drm_device whose connector state changed
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*
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* This function fires off the uevent for userspace and also calls the
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* output_poll_changed function, which is most commonly used to inform the fbdev
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* emulation code and allow it to update the fbcon output configuration.
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*
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* Drivers should call this from their hotplug handling code when a change is
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* detected. Note that this function does not do any output detection of its
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* own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
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* driver already.
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*
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* This function must be called from process context with no mode
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* setting locks held.
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*/
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void drm_kms_helper_hotplug_event(struct drm_device *dev)
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{
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/* send a uevent + call fbdev */
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@ -1066,6 +1097,16 @@ static void output_poll_execute(struct work_struct *work)
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schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
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}
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/**
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* drm_kms_helper_poll_disable - disable output polling
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* @dev: drm_device
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*
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* This function disables the output polling work.
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*
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* Drivers can call this helper from their device suspend implementation. It is
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* not an error to call this even when output polling isn't enabled or arlready
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* disabled.
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*/
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void drm_kms_helper_poll_disable(struct drm_device *dev)
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{
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if (!dev->mode_config.poll_enabled)
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@ -1074,6 +1115,16 @@ void drm_kms_helper_poll_disable(struct drm_device *dev)
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_disable);
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/**
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* drm_kms_helper_poll_enable - re-enable output polling.
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* @dev: drm_device
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*
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* This function re-enables the output polling work.
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*
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* Drivers can call this helper from their device resume implementation. It is
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* an error to call this when the output polling support has not yet been set
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* up.
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*/
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void drm_kms_helper_poll_enable(struct drm_device *dev)
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{
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bool poll = false;
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@ -1093,6 +1144,25 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_enable);
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/**
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* drm_kms_helper_poll_init - initialize and enable output polling
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* @dev: drm_device
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*
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* This function intializes and then also enables output polling support for
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* @dev. Drivers which do not have reliable hotplug support in hardware can use
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* this helper infrastructure to regularly poll such connectors for changes in
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* their connection state.
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*
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* Drivers can control which connectors are polled by setting the
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* DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
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* connectors where probing live outputs can result in visual distortion drivers
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* should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
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* Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
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* completely ignored by the polling logic.
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*
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* Note that a connector can be both polled and probed from the hotplug handler,
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* in case the hotplug interrupt is known to be unreliable.
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*/
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void drm_kms_helper_poll_init(struct drm_device *dev)
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{
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INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
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@ -1102,12 +1172,39 @@ void drm_kms_helper_poll_init(struct drm_device *dev)
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_init);
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/**
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* drm_kms_helper_poll_fini - disable output polling and clean it up
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* @dev: drm_device
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*/
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void drm_kms_helper_poll_fini(struct drm_device *dev)
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{
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drm_kms_helper_poll_disable(dev);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_fini);
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/**
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* drm_helper_hpd_irq_event - hotplug processing
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* @dev: drm_device
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*
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* Drivers can use this helper function to run a detect cycle on all connectors
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* which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
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* other connectors are ignored, which is useful to avoid reprobing fixed
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* panels.
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*
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* This helper function is useful for drivers which can't or don't track hotplug
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* interrupts for each connector.
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*
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* Drivers which support hotplug interrupts for each connector individually and
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* which have a more fine-grained detect logic should bypass this code and
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* directly call drm_kms_helper_hotplug_event() in case the connector state
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* changed.
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*
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* This function must be called from process context with no mode
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* setting locks held.
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*
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* Note that a connector can be both polled and probed from the hotplug handler,
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* in case the hotplug interrupt is known to be unreliable.
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*/
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bool drm_helper_hpd_irq_event(struct drm_device *dev)
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{
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struct drm_connector *connector;
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