On Mittwoch, 11. Oktober 2023 19:57:26 CET Luca Weiss wrote: > From: Vladimir Lypak <vladimir.lypak@xxxxxxxxx> > > If the IOMMU has a power domain then some state will be lost in > qcom_iommu_suspend and TZ will reset device if we don't call > qcom_scm_restore_sec_cfg before accessing it again. > > Signed-off-by: Vladimir Lypak <vladimir.lypak@xxxxxxxxx> > [luca@xxxxxxxxx: reword commit message a bit] > Signed-off-by: Luca Weiss <luca@xxxxxxxxx> > --- > This patch is required for MSM8953 GPU IOMMU. > > See also downstream sources: > https://git.codelinaro.org/clo/la/kernel/msm-4.9/-/commit/f8464885dafc5b780b > 85de29d92a08c692d3a4d0 > https://git.codelinaro.org/clo/la/kernel/msm-4.9/-/blob/LA.UM.10.6.2.r1-025 > 00-89xx.0/drivers/iommu/arm-smmu.c#L4221-4225 > > Since the compatibles provided by this driver (qcom,msm-iommu-v*) is > only used on msm8916, msm8939 and msm8953, and both 8916 and 8939 don't > have a power domain on the IOMMU, I also don't expect anything to break > there. Hi all, Any feedback on this patch? Regards Luca > --- > drivers/iommu/arm/arm-smmu/qcom_iommu.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c > b/drivers/iommu/arm/arm-smmu/qcom_iommu.c index 97b2122032b2..67abeb02cf53 > 100644 > --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c > +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c > @@ -900,8 +900,16 @@ static void qcom_iommu_device_remove(struct > platform_device *pdev) static int __maybe_unused qcom_iommu_resume(struct > device *dev) > { > struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev); > + int ret; > + > + ret = clk_bulk_prepare_enable(CLK_NUM, qcom_iommu->clks); > + if (ret < 0) > + return ret; > + > + if (dev->pm_domain) > + return qcom_scm_restore_sec_cfg(qcom_iommu->sec_id, 0); > > - return clk_bulk_prepare_enable(CLK_NUM, qcom_iommu->clks); > + return ret; > } > > static int __maybe_unused qcom_iommu_suspend(struct device *dev) > > --- > base-commit: 2933a1156742d8c47550493a77af8e2d81cf3c84 > change-id: 20231011-msm8953-iommu-restore-fabc2e31fee7 > > Best regards,
