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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
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

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16  9:00 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

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