linux-kernel - Re: [PATCH v2 1/1] ARM: dts: dra7: add entry for bb2d module

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Date:   Thu, 9 Dec 2021 09:08:08 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Yongqin Liu <yongqin.liu@...aro.org>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Gowtham Tammana <g-tammana@...com>,
        Jyri Sarha <jsarha@...com>
Subject: Re: [PATCH v2 1/1] ARM: dts: dra7: add entry for bb2d module

* Yongqin Liu <yongqin.liu@...aro.org> [211123 17:27]:
> Hi, Neil
> 
> On Tue, 23 Nov 2021 at 20:47, Neil Armstrong <narmstrong@...libre.com> wrote:
> >
> > Hi,
> >
> > On 23/11/2021 13:17, Yongqin Liu wrote:
> > > Hi, Neil, Tony
> > >
> > > # sorry for the confusion if you have received the mail which I sent
> > > before, which is not in plain text mode.
> > >
> > > We have one out of tree change to enable the SGX544 gpu for the
> > > beagleboard-X15 Android build,
> > >     https://android-review.linaro.org/c/kernel/common/+/20521/11/arch/arm/boot/dts/dra7.dtsi
> > >
> > > and that seems to conflict with this BB2D enabling change,
> > > Could you please help give some suggestions on how we should update our patch
> > > to make it work with BB2D, without the revert of this change?
> >
> > This BB2D patch alters the target-module@...00000 while your SGX
> > change alters the target-module@...00000.
> >
> > Please rebase your patches.
> I am sorry if the "conflict" I used previously caused the confusion.
> What I meant with the "conflict" word is the feature conflict, not the
> patch merge conflict.
> 
> I could merge my SGX change with the BB2D change there, but then my
> build could not boot successfully to the homescreen,
> I need to revert the BB2D change to have it boot to the homescreen successfully.
> 
> Here are the serial console output in case you want to check:
> https://pastebin.com/RY472b96  work with the BB2D change reverted
> https://pastebin.com/aP97r7rJ    does not work with the BB2D change.
> 
> Not sure if you have any idea about the problem.
> Please help give some suggestions on what I could try.

Sounds like your out of tree SGX patches also tinker with the BB2D module.

To me it sounds like you can just tag the new target-module@...00000 added
by this patch with status = "disabled" in your SGX patch until you have
updated the driver code.

I'm adding this patch into omap-for-v5.17/dt as for 2D acceleration there
is the etnaviv driver in the mainline kernel that should be usable to
some extent.

Regards,

Tony