linux-kernel - Re: [PATCH 3/4] dt-bindings: drm/bridge: anx7625: Change bus-type to 7 (DPI)

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Message-ID: <CAGXv+5EXpfVQCSUwgMP2fGf6ZPzvTuZxYbLB+F=cOKH4op0o3Q@mail.gmail.com>
Date:   Mon, 18 Apr 2022 14:31:38 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Xin Ji <xji@...logixsemi.com>
Cc:     Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org, Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>, qwen@...logixsemi.com,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        devicetree@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        bliang@...logixsemi.com
Subject: Re: [PATCH 3/4] dt-bindings: drm/bridge: anx7625: Change bus-type to
 7 (DPI)

Hi,

On Thu, Apr 14, 2022 at 10:27 AM Xin Ji <xji@...logixsemi.com> wrote:
>
> On Wed, Apr 13, 2022 at 04:28:51PM +0200, Robert Foss wrote:
> > On Sat, 9 Apr 2022 at 06:47, Xin Ji <xji@...logixsemi.com> wrote:
> > >
> > > On Mon, Apr 04, 2022 at 12:52:14PM -0500, Rob Herring wrote:
> > > > On Mon, Mar 28, 2022 at 08:09:54PM +0800, Xin Ji wrote:
> > > > > Change bus-type define for DPI.
> > > > >
> > > > > Fixes: a43661e7e819 ("dt-bindings:drm/bridge:anx7625:add vendor define")
> > > > >
> > > > > Signed-off-by: Xin Ji <xji@...logixsemi.com>
> > > > > ---
> > > > >  .../devicetree/bindings/display/bridge/analogix,anx7625.yaml  | 4 ++--
> > > > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > > > index 0d38d6fe3983..4590186c4a0b 100644
> > > > > --- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > > > +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > > > @@ -106,7 +106,7 @@ properties:
> > > > >                remote-endpoint: true
> > > > >
> > > > >                bus-type:
> > > > > -                enum: [1, 5]
> > > > > +                enum: [7]
> > > >
> > > > Changing is an ABI break, but didn't we revert adding this?
> > > Hi Rob, sorry, what do you mean about ABI break? Do I need remove this
> > > patch in this serial? Or do I need revert patch
> > > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.freedesktop.org%2Fpatch%2F462331%2F&amp;data=04%7C01%7Cxji%40analogixsemi.com%7C10f5b0213f434592936008da1d59f566%7Cb099b0b4f26c4cf59a0fd5be9acab205%7C0%7C0%7C637854569490105386%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=vK0Vmb9S425kHZc1WurfnNhnoXDMbUGkkdY1PVnfS9g%3D&amp;reserved=0, I don't know how to do
> > > it.
> > >
> >
> > I contributed to the confusion about this, let's see if we can clear it up.
> >
> > An issue was found related to which enum values were used to represent
> > what late in the last release cycle. As a result a revert[1] patch for
> > everything touching bus-type in anx7625 was merged.
> >
> > This patch, does not apply to drm-misc-next due to the revert, and if
> > Xin Ji rebases his work on the drm-misc-next there should be no
> > ABI-change as this patch when fixed up will introduce bus-type to the
> > nax7625 ABI.
> >
> > Xin: Does this make sense to you?
> Hi Robert Foss, yes, my work is based on drm-misc-next, all I can do,
> just make a fix up patch(this patch) to change the bus-type define.

The revert was applied to the soc tree and merged into Linus's tree
in v5.17-rc8. It was not present in drm-misc-next until April 5 with
commit 9cbbd694a58b ("Merge drm/drm-next into drm-misc-next").

So please fetch the latest drm-misc-next, rebase your patches on top, and
resend.


Thanks
ChenYu