linux-kernel - Re: [PATCH v6 2/6] drm/format-helper: Add drm_fb_xrgb8888_to_mono

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Date:   Wed, 16 Feb 2022 10:16:35 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: Re: [PATCH v6 2/6] drm/format-helper: Add
 drm_fb_xrgb8888_to_mono_reversed()

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@...hat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Maxime Ripard <maxime@...no.tech>

Maxime

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