| Message ID | 20210708103432.1690385-1-thierry.reding@gmail.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | arm64: tegra: Enable audio IOMMU support on Tegra194 | expand |
On Thu, 8 Jul 2021 12:34:30 +0200, Thierry Reding wrote: > This small series addresses a minor issue with how IOMMU support is > wired up on various Tegra generations. Currently the virtual "card" > device is used to allocate DMA memory for, but since that device does > not actually exist, the path to memory cannot be correctly described. > > To address this, this series moves to using the ADMAIF as the DMA device > for audio. This is a real device that can have a proper DMA mask set and > with which a stream ID can be associated with in the SMMU. The memory > accesses technically originate from the ADMA controller (that the ADMAIF > uses), but DMA channel are dynamically allocated at runtime while DMA > memory is allocated at driver load time, drivers won't have access to > the ADMA device yet. > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next Thanks! [1/2] ASoC: tegra: Use ADMAIF component for DMA allocations commit: 0dfc21c1a4cac321749a53c92da616d9546d00e3 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
From: Thierry Reding <treding@nvidia.com> This small series addresses a minor issue with how IOMMU support is wired up on various Tegra generations. Currently the virtual "card" device is used to allocate DMA memory for, but since that device does not actually exist, the path to memory cannot be correctly described. To address this, this series moves to using the ADMAIF as the DMA device for audio. This is a real device that can have a proper DMA mask set and with which a stream ID can be associated with in the SMMU. The memory accesses technically originate from the ADMA controller (that the ADMAIF uses), but DMA channel are dynamically allocated at runtime while DMA memory is allocated at driver load time, drivers won't have access to the ADMA device yet. Further patches will be required to correct this issue on Tegra186 and Tegra210, but I wanted to get feedback on this approach first. Changes in v2: - add backwards-compatibility fallback Thierry Thierry Reding (2): ASoC: tegra: Use ADMAIF component for DMA allocations arm64: tegra: Enable audio IOMMU support on Tegra194 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 4 ++++ sound/soc/tegra/tegra_pcm.c | 30 ++++++++++++++---------- 2 files changed, 22 insertions(+), 12 deletions(-)