linux-kernel - Re: [PATCH] iommu/arm-smmu-qcom: Select identity domain for sc8280xp MDSS

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Date:   Fri, 13 Jan 2023 05:16:49 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-qcom: Select identity domain for sc8280xp
 MDSS



On 13.01.2023 05:11, Bjorn Andersson wrote:
> The Qualcomm display driver installs a translation domain once it has
> mapped a framebuffer. Use the identity domain for this device on
> SC8280XP as well, to avoid faults from EFI FB accessing the framebuffer
> while this is being set up.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 4c53824582d4..cebc10c0492d 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -250,6 +250,7 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
>  	{ .compatible = "qcom,sc7280-mdss" },
>  	{ .compatible = "qcom,sc7280-mss-pil" },
>  	{ .compatible = "qcom,sc8180x-mdss" },
> +	{ .compatible = "qcom,sc8280xp-mdss" },
>  	{ .compatible = "qcom,sm8250-mdss" },
>  	{ .compatible = "qcom,sdm845-mdss" },
>  	{ .compatible = "qcom,sdm845-mss-pil" },