From: Gerd Hoffmann <kraxel@redhat.com>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Sam Ravnborg <sam@ravnborg.org>,
Rob Herring <robh@kernel.org>,
Emil Velikov <emil.l.velikov@gmail.com>,
Hans de Goede <hdegoede@redhat.com>,
bluescreen_avenger@verizon.net,
Greg KH <gregkh@linuxfoundation.org>,
DRI Development <dri-devel@lists.freedesktop.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v4 0/9] drm: Support simple-framebuffer devices and firmware fbs
Date: Tue, 20 Apr 2021 11:22:04 +0200 [thread overview]
Message-ID: <20210420092204.7azdb7nxgofegjht@sirius.home.kraxel.org> (raw)
In-Reply-To: <YH6U92Q71ntU6Z1R@phenom.ffwll.local>
Hi,
> > > Patches 4 to 8 add the simpledrm driver. It's build on simple DRM helpers
> > > and SHMEM. It supports 16-bit, 24-bit and 32-bit RGB framebuffers. During
> >
> > .... if support for 8-bit frame buffers would be added?
>
> Is that 8-bit greyscale or 8-bit indexed with 256 entry palette? Former
> shouldn't be a big thing, but the latter is only really supported by the
> overall drm ecosystem in theory. Most userspace assumes that xrgb8888
> works, and we keep that illusion up by emulating it in kernel for hw which
> just doesn't support it. But reformatting xrgb8888 to c8 is tricky at
> best.
Well. cirrus converts xrgb8888 on the fly to rgb888 or rgb565
(depending on display resolution). We could pull off the same trick
here and convert to rgb332 (assuming we can program the palette with the
color cube needed for that). Wouldn't look pretty, but would probably
work better than expecting userspace know what color palettes are in
2021 ...
take care,
Gerd
next prev parent reply other threads:[~2021-04-20 9:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 9:00 [PATCH v4 0/9] drm: Support simple-framebuffer devices and firmware fbs Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 1/9] drm/format-helper: Pass destination pitch to drm_fb_memcpy_dstclip() Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 2/9] drm/format-helper: Add blitter functions Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 3/9] drm/aperture: Add infrastructure for aperture ownership Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 4/9] drm: Add simpledrm driver Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 5/9] drm/simpledrm: Add fbdev emulation Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 6/9] drm/simpledrm: Initialize framebuffer data from device-tree node Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 7/9] drm/simpledrm: Acquire clocks from DT device node Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 8/9] drm/simpledrm: Acquire regulators " Thomas Zimmermann
2021-04-16 9:00 ` [PATCH v4 9/9] drm/simpledrm: Acquire memory aperture for framebuffer Thomas Zimmermann
2021-04-19 8:00 ` [PATCH v4 0/9] drm: Support simple-framebuffer devices and firmware fbs Geert Uytterhoeven
2021-04-20 8:46 ` Daniel Vetter
2021-04-20 9:16 ` Geert Uytterhoeven
2021-04-20 11:11 ` Daniel Vetter
2021-04-20 9:22 ` Gerd Hoffmann [this message]
2021-04-20 9:27 ` Geert Uytterhoeven
2021-04-26 12:22 ` Thomas Zimmermann
2021-04-26 19:05 ` Geert Uytterhoeven
2021-04-26 12:18 ` Thomas Zimmermann
2021-04-26 15:08 ` Daniel Vetter
2021-04-29 10:24 ` Maxime Ripard
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