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Message-ID: <Zk4wvTjld4QVBMDY@hu-bjorande-lv.qualcomm.com>
Date: Wed, 22 May 2024 10:51:57 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Chris Lew <quic_clew@...cinc.com>, Bjorn Andersson <andersson@...nel.org>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Peter Zijlstra
<peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Will Deacon
<will@...nel.org>, Waiman Long <longman@...hat.com>,
Boqun Feng
<boqun.feng@...il.com>, Jonathan Corbet <corbet@....net>,
Mathieu Poirier
<mathieu.poirier@...aro.org>,
Rob Herring <robh@...nel.org>,
"Krzysztof
Kozlowski" <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Konrad Dybcio
<konrad.dybcio@...aro.org>,
<linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH 7/7] arm64: dts: qcom: sm8650: Add hwlock to remoteproc
On Wed, May 22, 2024 at 09:27:29AM +0200, Krzysztof Kozlowski wrote:
> On 17/05/2024 00:58, Chris Lew wrote:
> > Add the hwlock property to remoteproc. This enables the remoteproc to
> > try and bust the smem hwspinlock if the remoteproc has crashed while
> > holding the hwspinlock.
> >
> > Signed-off-by: Chris Lew <quic_clew@...cinc.com>
> > ---
> > arch/arm64/boot/dts/qcom/sm8650.dtsi | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > index 62a6e77730bc..a65a1679f003 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > @@ -2878,6 +2878,7 @@ remoteproc_mpss: remoteproc@...0000 {
> >
> > qcom,smem-states = <&smp2p_modem_out 0>;
> > qcom,smem-state-names = "stop";
> > + hwlocks = <&tcsr_mutex 3>;
>
> lock #3 is used by smem, so this proves you are taking someone else's
> lock.
The lock is a shared resource, it's not "some else's lock".
Regards,
Bjorn
> I commented on this in the binding, but let's be specific:
>
> NAK, please carry:
>
> Nacked-by: Krzysztof Kozlowski <krzk@...nel.org>
>
> Best regards,
> Krzysztof
>
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