From ec26d9e9382f432225d76b3ff1c7f72e21192f7f Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Fri, 20 Nov 2015 16:15:30 +0800 Subject: [PATCH] drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format Add a helper that can be used to obtain the number of bits per pixel corresponding to a given MIPI DSI pixel format. This is useful in bandwidth calculations, for example. Signed-off-by: Liu Ying Acked-by: Thierry Reding Signed-off-by: Chris Zhong [treding@nvidia.com: add kerneldoc comment and commit message] Signed-off-by: Thierry Reding --- include/drm/drm_mipi_dsi.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index f1d8d0dbb4f1..4396c9f22af5 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -163,6 +163,31 @@ 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 - obtain the number of bits per pixel for any + * given pixel format defined by the MIPI DSI + * specification + * @fmt: MIPI DSI pixel format + * + * Returns: The number of bits per pixel of the given pixel format. + */ +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); -- 2.20.1