On Mon, Jan 26, 2026 at 04:28:24PM +0100, Eric Auger wrote: > On 12/10/25 2:37 PM, Shameer Kolothum wrote: > > From: Nicolin Chen <[email protected]> > > > > Add ACPI DSDT support for Tegra241 CMDQV when the SMMUv3 instance is > > created with tegra241-cmdqv=on. > > Pls can you give a point to the DSDT spec to understand why this is > needed and what needs to be added.
This was an implementation decision by ARM that CMDQV node resides in DSDT v.s. IORT. Kernel driver scans DSDT unconditionally: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c#n4572 NVIDIA also has a public DSDT: https://github.com/NVIDIA/edk2-nvidia/blob/main/Silicon/NVIDIA/Drivers/ConfigurationManagerData/AcpiTableList/PlatformASLTablesLib/Dsdt_TH500.asl#L1005 I don't think there is a DSDT spec though... Nicolin
