From: Keith Packard <keithp@keithp.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-dev@lists.linaro.org,
"Clark, Rob" <rob@ti.com>, Archit Taneja <archit@ti.com>
Subject: Re: Proposal for a low-level Linux display framework
Date: Thu, 15 Sep 2011 15:50:32 +0000 [thread overview]
Message-ID: <yun8vpp7qk7.fsf@aiko.keithp.com> (raw)
In-Reply-To: <1316100594.23214.65.camel@deskari>
[-- Attachment #1: Type: text/plain, Size: 1797 bytes --]
On Thu, 15 Sep 2011 18:29:54 +0300, Tomi Valkeinen <tomi.valkeinen@ti.com> wrote:
> 1) It's part of DRM, so it doesn't help fb or v4l2 drivers. Except if
> the plan is to make DRM the core Linux display framework, upon which
> everything else is built, and fb and v4l2 are changed to use DRM.
I'd like to think we could make DRM the underlying display framework;
it already exposes an fb interface, and with overlays, a bit more of the
v4l2 stuff is done as well. Certainly eliminating three copies of mode
setting infrastructure would be nice...
> But even if it was done like that, I see that it's combining two
> separate things: 1) the lower level HW control, and 2) the upper level
> buffer management, policies and userspace interfaces.
Those are split between the DRM layer and the underlying device driver,
which provides both kernel (via fb) and user space interfaces.
> 2) It's missing the panel driver part. This is rather important on
> embedded systems, as the panels often are not "dummy" panels, but they
> need things like custom initialization, sending commands to adjust
> backlight, etc.
We integrate the panel (and other video output) drivers into the device
drivers. With desktop chips, they're not easily separable. None of the
desktop output drivers are simple; things like DisplayPort require link
training, and everyone needs EDID. We share some of that code in the DRM
layer today, and it would be nice to share even more.
We should figure out if the DRM interfaces are sufficient for your
needs; they're pretty flexible at this point.
Of course, backlight remains a mess in the desktop world; with many
custom backlight drivers along with generic ACPI and then
per-video-device drivers as well.
--
keith.packard@intel.com
[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]
next prev parent reply other threads:[~2011-09-15 15:50 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-15 12:07 Proposal for a low-level Linux display framework Tomi Valkeinen
2011-09-15 14:59 ` Keith Packard
2011-09-15 15:29 ` Tomi Valkeinen
2011-09-15 15:50 ` Keith Packard [this message]
2011-09-15 17:05 ` Alan Cox
2011-09-17 21:36 ` Laurent Pinchart
2011-09-15 17:12 ` Florian Tobias Schandinat
2011-09-15 17:18 ` Alan Cox
2011-09-15 17:47 ` Florian Tobias Schandinat
2011-09-15 19:05 ` Alan Cox
2011-09-15 19:46 ` Florian Tobias Schandinat
2011-09-15 21:31 ` Alan Cox
2011-09-15 17:52 ` Alex Deucher
2011-09-15 17:56 ` Geert Uytterhoeven
2011-09-15 18:04 ` Alex Deucher
2011-09-15 18:39 ` Florian Tobias Schandinat
2011-09-15 18:58 ` Alan Cox
2011-09-15 19:18 ` Florian Tobias Schandinat
[not found] ` <4E724F93.1050203-Mmb7MZpHnFY@public.gmane.org>
2011-09-15 19:28 ` Alan Cox
2011-09-15 19:45 ` Alex Deucher
2011-09-17 14:44 ` Felipe Contreras
2011-09-17 15:16 ` Rob Clark
2011-09-17 16:11 ` Florian Tobias Schandinat
2011-09-17 16:47 ` Dave Airlie
2011-09-17 18:15 ` Florian Tobias Schandinat
2011-09-17 18:23 ` Dave Airlie
2011-09-17 19:06 ` Florian Tobias Schandinat
2011-09-17 19:25 ` Corbin Simpson
2011-09-17 21:25 ` Alex Deucher
2011-09-17 20:25 ` Alan Cox
2011-10-31 20:24 ` Jesse Barnes
2011-09-17 16:50 ` Rob Clark
2011-09-16 4:53 ` Keith Packard
2011-09-17 23:12 ` Laurent Pinchart
2011-09-18 16:14 ` Rob Clark
2011-09-18 21:55 ` Laurent Pinchart
[not found] ` <201109180112.15896.laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2011-09-18 22:23 ` Alan Cox
2011-09-19 0:09 ` Rob Clark
2011-09-20 23:32 ` Laurent Pinchart
2011-09-15 18:12 ` Keith Packard
2011-09-15 17:21 ` Tomi Valkeinen
2011-09-15 18:32 ` Rob Clark
2011-09-16 0:55 ` Keith Packard
2011-09-16 6:38 ` Tomi Valkeinen
2011-09-16 14:17 ` Daniel Vetter
2011-09-16 16:53 ` Alan Cox
2011-09-19 6:33 ` Tomi Valkeinen
2011-09-19 6:53 ` Keith Packard
2011-09-19 7:29 ` Tomi Valkeinen
2011-09-20 8:29 ` Patrik Jakobsson
2011-09-20 15:55 ` Keith Packard
2011-09-20 21:20 ` Patrik Jakobsson
2011-09-21 6:01 ` Tomi Valkeinen
2011-09-21 18:07 ` Patrik Jakobsson
2011-09-15 15:03 ` Kyungmin Park
2011-09-21 13:26 ` Heiko Stübner
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=yun8vpp7qk7.fsf@aiko.keithp.com \
--to=keithp@keithp.com \
--cc=archit@ti.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=linaro-dev@lists.linaro.org \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rob@ti.com \
--cc=tomi.valkeinen@ti.com \
/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).