Re: [PATCH 2/4] drm/doc: integrate crtc helper api into docbook

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Daniel,

Thanks for the patch.

(text reflowed for review purpose to fit the e-mail line length limit)

On Wednesday 31 October 2012 10:11:48 Daniel Vetter wrote:
> - Add the missing doc for drm_helper_move_panel_connectors_to_head.
> - Fixup any outdated stuff in existing sections. I've only looked at
>   those kerneldoc headers that actually resulted in a complaint from
>   the kerneldoc parser tool.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

After fixing the small mistake below,

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  Documentation/DocBook/drm.tmpl    |  4 +++
>  drivers/gpu/drm/drm_crtc_helper.c | 54 ++++++++++++++++++++----------------
>  2 files changed, 34 insertions(+), 24 deletions(-)
> 
> diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
> index ca45155..43e706e 100644
> --- a/Documentation/DocBook/drm.tmpl
> +++ b/Documentation/DocBook/drm.tmpl
> @@ -2106,6 +2106,10 @@ 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 1021f505..e2e19ef 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -92,22 +92,21 @@ 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 conector detection.
>   *
>   * RETURNS:
>   * Number of modes found on @connector.
> @@ -353,17 +352,23 @@ drm_crtc_prepare_encoders(struct drm_device *dev)
>  }
> 
>  /**
> - * drm_crtc_set_mode - set a mode
> + * drm_crtc_set_mode - internal helper to set a mode

The function is actually now called drm_crtc_helper_set_mode.

>   * @crtc: CRTC to program
>   * @mode: mode to use
>   * @x: width of mode
>   * @y: height of mode
> + * @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.
> + * chance 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.
>   *
>   * RETURNS:
>   * True if the mode was set successfully, or false otherwise.
> @@ -519,20 +524,19 @@ 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() interfaces.
>   *
>   * RETURNS:
> - * Zero. (FIXME)
> + * Returns 0 on success, -ERRNO on failure.
>   */
>  int drm_crtc_helper_set_config(struct drm_mode_set *set)
>  {
> @@ -828,12 +832,14 @@ 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 ->dpsm() callback provided by the driver appropriately.
>   */
>  void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
>  {
-- 
Regards,

Laurent Pinchart