linux-kernel - Re: [PATCH v9.5.1 09/20] drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format

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Date:	Fri, 15 May 2015 09:34:54 +0300
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Liu Ying <Ying.Liu@...escale.com>, dri-devel@...ts.freedesktop.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	kernel@...gutronix.de, p.zabel@...gutronix.de,
	thierry.reding@...il.com, shawn.guo@...aro.org, airlied@...ux.ie,
	andyshrk@...il.com, stefan.wahren@...e.com, a.hajda@...sung.com,
	sboyd@...eaurora.org, daniel.vetter@...ll.ch,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9.5.1 09/20] drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format

On Thu, 14 May 2015, Liu Ying <Ying.Liu@...escale.com> wrote:
> This patch adds a helper to get bits per pixel value of MIPI DSI pixel format.
> The helper takes a parameter in the type 'enum mipi_dsi_pixel_format' and
> returns it's bits per pixel value if the parameter is valid, otherwise, it
> returns -EINVAL.  The helper makes users' life easier to do the conversion
> from a specific MIPI DSI pixel format to it's bits per pixel value.
>
> Signed-off-by: Liu Ying <Ying.Liu@...escale.com>

Reviewed-by: Jani Nikula <jani.nikula@...el.com>


> ---
> v9.5->v9.5.1:
>  * To address Thierry Reding's comments, add a commit message to describe why
>    the helper is useful and when to use it and fix typo in kernel-doc from
>    'mipi dsi' to 'MIPI DSI'.
>
> v9->v9.5:
>  * Add kernel-doc for the new helper function to address Daniel Vetter's
>    comment.
>
> v8->v9:
>  * Rebase onto the imx-drm/next branch of Philipp Zabel's open git repository.
>
> v7->v8:
>  * None.
>
> v6->v7:
>  * None.
>
> v5->v6:
>  * Address the over 80 characters in one line warning reported by the
>    checkpatch.pl script.
>
> v4->v5:
>  * None.
>
> v3->v4:
>  * None.
>
> v2->v3:
>  * None.
>
> v1->v2:
>  * Thierry Reding suggested that the mipi_dsi_pixel_format_to_bpp() function
>    could be placed at the common DRM MIPI DSI driver.
>    This patch is newly added.
>
>  include/drm/drm_mipi_dsi.h | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index f1d8d0d..186b15b 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -163,6 +163,28 @@ static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
>  	return container_of(dev, struct mipi_dsi_device, dev);
>  }
>  
> +/**
> + * mipi_dsi_pixel_format_to_bpp() - get bits per pixel for a MIPI DSI
> + *    pixel format
> + * @fmt: MIPI DSI pixel format
> + *
> + * Return: The bits per pixel value for the MIPI DSI pixel format on success or
> + *    a negative error code on failure.
> + */
> +static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
> +{
> +	switch (fmt) {
> +	case MIPI_DSI_FMT_RGB888:
> +	case MIPI_DSI_FMT_RGB666:
> +		return 24;
> +	case MIPI_DSI_FMT_RGB666_PACKED:
> +		return 18;
> +	case MIPI_DSI_FMT_RGB565:
> +		return 16;
> +	}
> +	return -EINVAL;
> +}
> +
>  struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
>  int mipi_dsi_attach(struct mipi_dsi_device *dsi);
>  int mipi_dsi_detach(struct mipi_dsi_device *dsi);
> -- 
> 1.9.1
>

-- 
Jani Nikula, Intel Open Source Technology Center
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