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

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Date: Mon, 29 Jan 2024 17:37:33 +0000
From: Conor Dooley <conor@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.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 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?

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>
> 

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