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Message-ID: <20240129-numerate-brought-4660c2a89719@spud>
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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