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Wed, 6 Mar 2024 19:53:19 -0800 Date: Wed, 6 Mar 2024 19:53:18 -0800 From: Nicolin Chen To: Jean-Philippe Brucker CC: , , , Subject: Re: IOMMU_FWSPEC_PCI_RC_ATS for SMMUv3 with DT configuration? 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This flag seems to be only set in > > the drivers/acpi/arm64/iort.c file, which does not work for DT > > configuration. > > > > We have a need to enable ATS on a system using Device Tree. Is > > there a suggested way or name of DT binding to add? > > "ats-supported" was acked by Rob: > > https://lore.kernel.org/linux-iommu/20200311124506.208376-2-jean-philippe@linaro.org/ > > I don't remember why I didn't follow up with that series, probably just > the lack of users at the time (Arm SW model was the only ATS > implementation). A simpler implementation would be setting the existing > fwspec flag: > https://jpbrucker.net/git/linux/commit/?h=sva/current&id=4b6d187154557a7c46c9a67c13453d40a03cc078 Thanks for the reply and links! I am out of office this week. So I've asked my team mate to get that a try. Thank you Nicolin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel