From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>,
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 11:27:57 +0200 [thread overview]
Message-ID: <CAMuHMdX=0H3LHP5Yme9tpN4JnmpJcnF=SQN8bc=4XTd-X6AVTg@mail.gmail.com> (raw)
In-Reply-To: <20210420092204.7azdb7nxgofegjht@sirius.home.kraxel.org>
Hi Gerd,
On Tue, Apr 20, 2021 at 11:22 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
> > > > 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 ...
Yeah, I already had a similar idea for Amiga HAM ;-)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2021-04-20 9:28 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
2021-04-20 9:27 ` Geert Uytterhoeven [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAMuHMdX=0H3LHP5Yme9tpN4JnmpJcnF=SQN8bc=4XTd-X6AVTg@mail.gmail.com' \
--to=geert@linux-m68k.org \
--cc=airlied@linux.ie \
--cc=bluescreen_avenger@verizon.net \
--cc=broonie@kernel.org \
--cc=corbet@lwn.net \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=emil.l.velikov@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=hdegoede@redhat.com \
--cc=kraxel@redhat.com \
--cc=lgirdwood@gmail.com \
--cc=linux-doc@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mripard@kernel.org \
--cc=robh@kernel.org \
--cc=sam@ravnborg.org \
--cc=tzimmermann@suse.de \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).