linux-kernel - Re: [PATCH v2 RFC 10/10] drm/fourcc: Add DRM_FORMAT

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Message-ID: <09acb08a-7b96-69d0-2fb9-80381e234877@redhat.com>
Date:   Wed, 9 Mar 2022 14:41:21 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>, Helge Deller <deller@....de>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 RFC 10/10] drm/fourcc: Add DRM_FORMAT_D[1248]

On 3/7/22 21:52, Geert Uytterhoeven wrote:
> As Rn is light-on-dark, and Cn can be any colors, there are currently
> no fourcc codes to describe dark-on-light displays.
> 
> Introduce fourcc codes for a single-channel dark-on-light frame buffer
> format with two, four, sixteen, or 256 darkness levels.
> 
> As the number of bits per pixel may be less than eight, some of these
> formats rely on proper block handling for the calculation of bits per
> pixel and pitch.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat