linux-kernel - Re: [PATCH 0/4] arm64: dts: qcom: x1e80100: Add IRIS video codec

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Message-ID: <aMMg7OC_OgfK8X31@linaro.org>
Date: Thu, 11 Sep 2025 21:23:09 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Trilok Soni <quic_tsoni@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
	Vikash Garodia <vikash.garodia@....qualcomm.com>,
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH 0/4] arm64: dts: qcom: x1e80100: Add IRIS video codec

On Thu, Sep 11, 2025 at 12:02:54PM -0700, Trilok Soni wrote:
> On 9/11/2025 11:38 AM, Stephan Gerhold wrote:
> > Add the necessary definitions to enable the IRIS video codec for
> > accelerated video decoding on the X1E CRD and Lenovo ThinkPad T14s. The
> > additions are largely copied as-is from sm8550.dtsi with some minor changes
> > necessary for X1E.
> > 
> > The PAS interface used to boot the IRIS firmware is not functional in EL2.
> 
> Just to confirm my understanding of above statement. The patches below
> works w/ the Gunyah and Linux running at NS-EL1 and "not functional in
> EL2" means Video working w/ the KVM Hypervisor on X1E right? 
> 

Yes, the patches enable video acceleration when running Linux with
Gunyah as usual. I added an extra patch to disable IRIS when running
with KVM, because my patches would introduce regressions otherwise.

The old Venus driver does support starting the video firmware when
running without Gunyah (for KVM on the Chrome platforms). The same code
works for KVM on X1E, so we could easily enable it once there is a
solution for the describing the video-firmware IOMMU in the device tree.
Mukesh is working on solving that for SA8775p [1].

[1]: https://lore.kernel.org/linux-arm-msm/20250819165447.4149674-12-mukesh.ojha@oss.qualcomm.com/

Thanks,
Stephan