Re: [PATCH 2/3] ARM: dts: am437x-gp/epos-evm: drop unused panel timings

From: Tony Lindgren <tony@atomide.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: devicetree@vger.kernel.org, Aaro Koskinen <aaro.koskinen@iki.fi>,
	Merlijn Wajer <merlijn@wizzup.org>, Jyri Sarha <jsarha@ti.com>,
	Sebastian Reichel <sre@kernel.org>,
	dri-devel@lists.freedesktop.org,
	Peter Ujfalusi <peter.ujfalusi@ti.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Linux-OMAP <linux-omap@vger.kernel.org>
Subject: Re: [PATCH 2/3] ARM: dts: am437x-gp/epos-evm: drop unused panel timings
Date: Tue, 11 Feb 2020 08:27:19 -0800	[thread overview]
Message-ID: <20200211162719.GF64767@atomide.com> (raw)
In-Reply-To: <87b1111e-af06-1e2a-8baa-c3f9a15f1874@ti.com>

* Tomi Valkeinen <tomi.valkeinen@ti.com> [200211 16:14]:
> On 11/02/2020 18:05, Tony Lindgren wrote:
> > * Merlijn Wajer <merlijn@wizzup.org> [200211 12:54]:
> > > Hi,
> > > 
> > > On 11/02/2020 12:08, Tomi Valkeinen wrote:
> > > > On 11/02/2020 13:07, Laurent Pinchart wrote:
> > > > 
> > > > > > Hopefully soon (in five years? =) we can say that omapdrm supports all
> > > > > > the boards, and we can deprecate omapfb.
> > > > > 
> > > > > I'd love to send a patch to remove omapfb, but I'll let you do the
> > > > > honours :-)
> > > > 
> > > > Not before we add DSI support to omapdrm...
> > 
> > Hmm do your mean RFBI? The DSI support we already have :)
> 
> Oh, I didn't even remember RFBI... But it is not supported in omapfb either,
> so it's not blocking removal of omapfb.

Oh OK.

> We are still missing DSI command mode support, and moving it to the common DRM model.

Nope, DSI command mode support has been working just fine for
a while now :) And Sebastian has a WIP git tree of the common DRM
model changes for it. I don't think we have devices with DSI
command mode working for omapfb but not for omapdrm?

What got missed for v5.6-rc1 is the LCD backlight patch though,
I think the only issue there is default-brightness vs more common
default-brightness-value usage if you have any input to that.

> > > This is probably known, but for devices that would like use PowerVR SGX,
> > > there sometimes is only userspace available that works with omap(l)fb,
> > > and not with DRM. The Nokia N900 is such an example.
> > > 
> > > There might be a newer release of (closed) userspace coming for the
> > > aging device(s), but as it stands, I don't think it's possible to do 3D
> > > with PowerVR SGX on omapdrm currently.
> > > 
> > > But I might be wrong...
> > 
> > Yes SGX is a bottleneck currently for omap3 users. And I think
> > RFBI is blocking n8x0 from moving to omapdrm and finally leaving
> > drivers/video/fbdev/omap2 behind.
> > 
> > With those blockers fixed, I'd also be happy to just get rid of
> > drivers/video/fbdev/omap2 as there should be no reason to
> > keep using it.
> 
> I don't know what to do about SGX, but if someone sends patches to omapdrm
> to allow using SGX, I'll review =).

OK so then the only blocker seems to be the lack of SGX blobs
for omap3 devices which seems to be in process of getting fixed.

Regards,

Tony
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