linux-kernel - Re: [PATCH] media: renesas: vsp1: blacklist r8a7795 ES1.*

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Date:   Wed, 18 Jan 2023 15:39:06 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-renesas-soc@...r.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: renesas: vsp1: blacklist r8a7795 ES1.*

Hi Geert, Wolfram,

On Wed, Jan 18, 2023 at 02:30:51PM +0100, Geert Uytterhoeven wrote:
> On Wed, Jan 18, 2023 at 2:21 PM Laurent Pinchart wrote:
> > On Wed, Jan 18, 2023 at 01:20:02PM +0100, Wolfram Sang wrote:
> > > The earliest revision of these SoC may hang when underrunning. Later
> > > revisions have that fixed. Bail out when we detect a problematic
> > > version.
> > >
> > > Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> > > ---
> > >
> > > The BSP tries to work around the issue, yet this is neither upstreamable
> > > nor are we sure the solution is complete. Because the early SoC revision
> > > is hardly in use, we simply "document" the problem upstream.
> >
> > The workaround isn't upstreamable as-is, but I think it could be
> > upstreamed after being cleaned up.
> >
> > Overall, how much support do we still have upstream for H3 ES1.x, and do
> > we need to keep it ? H3 ES.1x is relatively old, does someone still rely
> > on it ?
> 
> I think the upstream support level for R-Car H3 ES1.x is about the same
> as for H3 ES2.0.

Question is, do we need to keep it ? :-) And if we do, instead of
black-listing devices in the VSP driver, how about dropping them from
r8a77950.dtsi ? We already delete quite a lot of devices there.

Note that without VSP support, you will get no display either, so the
DU device (and the LVDS encoder) so also be deleted.

-- 
Regards,

Laurent Pinchart