linux-kernel - Re: [PATCH v2] soc: mediatek: Add deprecated compatible to mmsys

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Date:   Fri, 16 Dec 2022 21:50:38 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, matthias.bgg@...nel.org,
        nancy.lin@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] soc: mediatek: Add deprecated compatible to mmsys

On Fri, Dec 16, 2022 at 9:35 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 01/12/2022 12:25, Chen-Yu Tsai wrote:
> > On Thu, Dec 1, 2022 at 7:20 PM Chen-Yu Tsai <wenst@...omium.org> wrote:
> >>
> >> On Mon, Nov 14, 2022 at 7:59 PM AngeloGioacchino Del Regno
> >> <angelogioacchino.delregno@...labora.com> wrote:
> >>>
> >>> Il 11/11/22 09:29, matthias.bgg@...nel.org ha scritto:
> >>>> From: Matthias Brugger <matthias.bgg@...il.com>
> >>>>
> >>>> For backward compatibility we add the deprecated compatible.
> >>>>
> >>>> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> >>>
> >>> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >>>
> >>> ...And tested on MT8195 Cherry Chromebook.
> >>
> >> This now seems like a bad idea. In the dtsi we have two nodes (vdosys0 and
> >> vdosys1) that both currently use the -mmsys compatible, which in the driver
> >> maps to vdosys0. So not only do we have vdosys1 incorrectly probing as
> >> vdosys0, we also have duplicate clks being registered and duplicate DRM
> >> pipelines. On my device vdosys1 ends up winning the duplicate clock race.
> >>
> >> I suggest just reverting this. The display stuff won't be useful unless
> >> the drivers are able to distinguish themselves from one another.
> >
> > That and try to fix the vdosys0 node ASAP.
>
> I'm not sure what you mean? If there are any patches that are in my queue that
> needs attention, please let me know.

It was more of a P.S. note.