Re: [PATCH v2 3/3] drm: simple_kms_helper: add support for bridges

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Aug 24, 2016 at 02:06:01PM +0200, Andrea Merello wrote:
> Introduce drm_simple_display_pipe_attach_bridge() and
> drm_simple_display_pipe_detach_bridge() in order to make it possible to use
> drm encoders with the simple display pipes managed by simple_kms_helpers
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
> Cc: Noralf Trønnes <noralf@tronnes.org>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: David Airlie <airlied@linux.ie>
> ---
>  drivers/gpu/drm/drm_simple_kms_helper.c | 42 ++++++++++++++++++++++++++++++++-
>  include/drm/drm_simple_kms_helper.h     |  5 ++++
>  2 files changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index d07cdb8..dfa3f1b 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -140,6 +140,46 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
>  };
>  
>  /**
> + * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
> + * @pipe: simple display pipe object
> + * @bridge: bridge to attach
> + *
> + * Makes it possible to still use the drm_simple_display_pipe helpers when
> + * a DRM bridge has to be used.
> + * Note that you probably want to initialize the pipe by passing a NULL
> + * connector to drm_simple_display_pipe_init()

Same nit: New paragraphs need and empty line, or reflow to make it one
that uses the full width.

> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
> +					struct drm_bridge *bridge)
> +{
> +	bridge->encoder = &pipe->encoder;
> +	pipe->encoder.bridge = bridge;
> +	return drm_bridge_attach(pipe->encoder.dev, bridge);
> +}
> +EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
> +
> +/**
> + * drm_simple_display_pipe_detach_bridge - Detach the bridge from the display pipe
> + * @pipe: simple display pipe object
> + *
> + * Detaches the drm bridge previously attached with
> + * drm_simple_display_pipe_attach_bridge()
> + *

Empty line.

With the nits addressed: Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> + */
> +void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe)
> +{
> +	if (WARN_ON(!pipe->encoder.bridge))
> +		return;
> +
> +	drm_bridge_detach(pipe->encoder.bridge);
> +	pipe->encoder.bridge = NULL;
> +}
> +EXPORT_SYMBOL(drm_simple_display_pipe_detach_bridge);
> +
> +/**
>   * drm_simple_display_pipe_init - Initialize a simple display pipeline
>   * @dev: DRM device
>   * @pipe: simple display pipe object to initialize
> @@ -152,7 +192,7 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
>   * plane-crtc-encoder pipe.
>   * If a connector is supplied, the pipe will be coupled with the provided
>   * connector. You may supply a NULL connector when using drm bridges, that
> - * handle connectors themselves (see drm_simple_display_pipe_bridge_attach()).
> + * handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
>   * Teardown of a simple display pipe is all handled automatically by the drm
>   * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
>   * release the memory for the structure themselves.
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index 2690397..5245d1f 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -85,6 +85,11 @@ struct drm_simple_display_pipe {
>  	const struct drm_simple_display_pipe_funcs *funcs;
>  };
>  
> +int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
> +					struct drm_bridge *bridge);
> +
> +void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe);
> +
>  int drm_simple_display_pipe_init(struct drm_device *dev,
>  			struct drm_simple_display_pipe *pipe,
>  			const struct drm_simple_display_pipe_funcs *funcs,
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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