linux-kernel - Re: [PATCH 1/1] arm64: dts: qcom: Add Lenovo Yoga C630

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Date:   Tue, 3 Sep 2019 07:21:53 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     agross@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] arm64: dts: qcom: Add Lenovo Yoga C630

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@...aro.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
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