diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2024-09-24 09:11:59 +0200 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2024-09-26 08:27:49 +0200 |
| commit | eb1f4adf9101573fc2347978a60d71c4f1176cca (patch) | |
| tree | 79d93133e4a6e4238c143cc9c32ae730a6828fd1 /drivers/gpu/drm/drm_fourcc.c | |
| parent | dc56f8428e5f34418f3243a60cec13166efe4fdb (diff) | |
drm/fbdev-helper: Move color-mode lookup into 4CC format helper
The color mode as specified on the kernel command line gives the user's
preferred color depth and number of bits per pixel. Move the
color-mode-to-format conversion from fbdev helpers into a 4CC helper,
so that it can be shared among DRM clients.
v2:
- fix grammar in commit message (Laurent)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-2-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/drm_fourcc.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fourcc.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c index 193cf8ed7912..3a94ca211f9c 100644 --- a/drivers/gpu/drm/drm_fourcc.c +++ b/drivers/gpu/drm/drm_fourcc.c @@ -36,7 +36,6 @@ * @depth: bit depth per pixel * * Computes a drm fourcc pixel format code for the given @bpp/@depth values. - * Useful in fbdev emulation code, since that deals in those values. */ uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth) { @@ -140,6 +139,35 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev, } EXPORT_SYMBOL(drm_driver_legacy_fb_format); +/** + * drm_driver_color_mode_format - Compute DRM 4CC code from color mode + * @dev: DRM device + * @color_mode: command-line color mode + * + * Computes a DRM 4CC pixel format code for the given color mode using + * drm_driver_color_mode(). The color mode is in the format used and the + * kernel command line. It specifies the number of bits per pixel + * and color depth in a single value. + * + * Useful in fbdev emulation code, since that deals in those values. The + * helper does not consider YUV or other complicated formats. This means + * only legacy formats are supported (fmt->depth is a legacy field), but + * the framebuffer emulation can only deal with such formats, specifically + * RGB/BGA formats. + */ +uint32_t drm_driver_color_mode_format(struct drm_device *dev, unsigned int color_mode) +{ + switch (color_mode) { + case 15: + return drm_driver_legacy_fb_format(dev, 16, 15); + case 32: + return drm_driver_legacy_fb_format(dev, 32, 24); + default: + return drm_driver_legacy_fb_format(dev, color_mode, color_mode); + } +} +EXPORT_SYMBOL(drm_driver_color_mode_format); + /* * Internal function to query information for a given format. See * drm_format_info() for the public API. |