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@freescale.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);