linux-kernel - Re: [PATCH] media: dt-bindings: qcom,sc7280-venus: Allow one IOMMU entry

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Message-Id: <CYRVI1IQ2UKE.15ZGCYLRT3ND3@fairphone.com>
Date: Tue, 30 Jan 2024 08:47:00 +0100
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Conor Dooley" <conor@...nel.org>, "Vikash Garodia"
 <quic_vgarodia@...cinc.com>
Cc: "Bjorn Andersson" <andersson@...nel.org>, "Konrad Dybcio"
 <konrad.dybcio@...aro.org>, "Stanimir Varbanov"
 <stanimir.k.varbanov@...il.com>, "Vikash Garodia"
 <quic_vgarodia@...cinc.com>, "Bryan O'Donoghue"
 <bryan.odonoghue@...aro.org>, "Mauro Carvalho Chehab" <mchehab@...nel.org>,
 "Rob Herring" <robh+dt@...nel.org>, "Krzysztof Kozlowski"
 <krzysztof.kozlowski+dt@...aro.org>, "Conor Dooley" <conor+dt@...nel.org>,
 <~postmarketos/upstreaming@...ts.sr.ht>, <phone-devel@...r.kernel.org>,
 "Stanimir Varbanov" <stanimir.varbanov@...aro.org>,
 <linux-arm-msm@...r.kernel.org>, <linux-media@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: dt-bindings: qcom,sc7280-venus: Allow one IOMMU
 entry

On Mon Jan 29, 2024 at 6:37 PM CET, Conor Dooley wrote:
> On Mon, Jan 29, 2024 at 08:48:54AM +0100, Luca Weiss wrote:
> > Some SC7280-based boards crash when providing the "secure_non_pixel"
> > context bank, so allow only one iommu in the bindings also.
> > 
> > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
>
> Do we have any idea why this happens? How is someone supposed to know
> whether or not their system requires you to only provide one iommu?
> Yes, a crash might be the obvious answer, but is there a way of knowing
> without the crashes?

+CC Vikash Garodia

Unfortunately I don't really have much more information than this
message here:
https://lore.kernel.org/linux-arm-msm/ff021f49-f81b-0fd1-bd2c-895dbbb03d56@quicinc.com/

And see also the following replies for a bit more context, like this
one:
https://lore.kernel.org/linux-arm-msm/a4e8b531-49f9-f4a1-51cb-e422c56281cc@quicinc.com/

Maybe Vikash can add some more info regarding this.

Regards
Luca

>
> Cheers,
> Conor.
>
> > ---
> > Reference:
> > https://lore.kernel.org/linux-arm-msm/20231201-sc7280-venus-pas-v3-2-bc132dc5fc30@fairphone.com/
> > ---
> >  Documentation/devicetree/bindings/media/qcom,sc7280-venus.yaml | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/qcom,sc7280-venus.yaml b/Documentation/devicetree/bindings/media/qcom,sc7280-venus.yaml
> > index 8f9b6433aeb8..10c334e6b3dc 100644
> > --- a/Documentation/devicetree/bindings/media/qcom,sc7280-venus.yaml
> > +++ b/Documentation/devicetree/bindings/media/qcom,sc7280-venus.yaml
> > @@ -43,6 +43,7 @@ properties:
> >        - const: vcodec_bus
> >  
> >    iommus:
> > +    minItems: 1
> >      maxItems: 2
> >  
> >    interconnects:
> > 
> > ---
> > base-commit: 596764183be8ebb13352b281a442a1f1151c9b06
> > change-id: 20240129-sc7280-venus-bindings-6e62a99620de
> > 
> > Best regards,
> > -- 
> > Luca Weiss <luca.weiss@...rphone.com>
> >