On Thu, 14 May 2015, Liu Ying <Ying.Liu@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> 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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