From: Lee Jones <lee.jones@linaro.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
robh+dt@kernel.org, agross@kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/1] arm64: dts: qcom: Add Lenovo Yoga C630
Date: Tue, 3 Sep 2019 07:21:53 +0100 [thread overview]
Message-ID: <20190903062153.GD26880@dell> (raw)
In-Reply-To: <20190903062040.GC26880@dell>
On Tue, 03 Sep 2019, Lee Jones wrote:
> On Mon, 02 Sep 2019, Bjorn Andersson wrote:
>
> > On Mon 02 Sep 06:24 PDT 2019, Lee Jones wrote:
> >
> > > From: Bjorn Andersson <bjorn.andersson@linaro.org>
> > >
> > > The Lenovo Yoga C630 is built on the SDM850 from Qualcomm, but this seem
> > > to be similar enough to the SDM845 that we can reuse the sdm845.dtsi.
> > >
> > > Supported by this patch is: keyboard, battery monitoring, UFS storage,
> > > USB host and Bluetooth.
> >
> > Applied this to next-20190829 and booted it, got a little bit of EFI FB,
> > then the screen goes blank and after a while I'm back in GRUB.
> >
> > I've not been able to figure out what's causing this though.
>
> Probably DMA. There is still an issue in the COM GENI Serial Engine
> Driver which reboots the system when a DMA transaction is initiated.
>
> However, with a workaround patch applied to the Serial Engine driver
> (drivers/soc/qcom/qcom-geni-se.c) this DTS has no issue booting the
> system.
>
> We have ~12 weeks to either fix or elegantly work around the Serial
> Engine issue. IMHO is makes no sense to hold back this enablement
> patch (which cannot go in via the -rcs) for something which is likely
> to be fixed and applied during v3.4-rcX.
NB: If you're worried about other entities thinking the platform boots
fault free due to this DTS patch being applied, I would suggest we
place a little "NB:" note in the changelog to explain the situation.
--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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prev parent reply other threads:[~2019-09-03 6:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-02 13:24 [PATCH 1/1] arm64: dts: qcom: Add Lenovo Yoga C630 Lee Jones
2019-09-03 5:44 ` Bjorn Andersson
2019-09-03 6:20 ` Lee Jones
2019-09-03 6:21 ` Lee Jones [this message]
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