[PATCH v6 2/6] drm/format-helper: Add drm_fb_xrgb8888_to_mono_reversed()

[Maxime Ripard]

On Mon, Feb 14, 2022 at 02:37:06PM +0100, Javier Martinez Canillas wrote:
> Add support to convert from XR24 to reversed monochrome for drivers that
> control monochromatic display panels, that only have 1 bit per pixel.
> 
> The function does a line-by-line conversion doing an intermediate step
> first from XR24 to 8-bit grayscale and then to reversed monochrome.
> 
> The drm_fb_gray8_to_mono_reversed_line() helper was based on code from
> drivers/gpu/drm/tiny/repaper.c driver.
> 
> Signed-off-by: Javier Martinez Canillas <javierm at redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann at suse.de>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

Reviewed-by: Maxime Ripard <maxime at cerno.tech>

Maxime
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