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ARM: tegra: Select appropriate DMA options for LPAE

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This automatically selects options for zone DMA and 64 bit DMA addresses
when LPAE is enabled on ARM Tegra platforms. These options are required
for proper operation with LPAE enabled.

The ZONE_DMA option is required to ensure that drivers that allocate DMA
memory get buffers from the first 4 GiB. This is necessary because a lot
of the controllers only support addressing 32 bits.

As for ARCH_DMA_ADDR_T_64BIT, there are situations where devices that do
support addresses of more than 32 bits (such as the display controller
or the GPU) can run without translating addresses through an IOMMU on a
device with more than 4 GiB of system memory.

Note that both of these options are stop-gap solutions required only
until the IOMMU can be properly integrated with the DMA mapping API and
drivers use that properly and consistently.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
[treding@nvidia.com: specify rationale for options]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Paul Kocialkowski 2017-04-25 00:59:46 +02:00 committed by Thierry Reding
parent 5771a8c088
commit 6aa26c5d66
1 changed files with 2 additions and 0 deletions
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2
arch/arm/mach-tegra/Kconfig
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@ -13,5 +13,7 @@ menuconfig ARCH_TEGRA
select ARCH_HAS_RESET_CONTROLLER
select RESET_CONTROLLER
select SOC_BUS
select ZONE_DMA if ARM_LPAE
select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
help
This enables support for NVIDIA Tegra based systems.