[PATCH 1/3] drm/tegra: Relax IOMMU usage criteria on old Tegra

[Dmitry Osipenko]

04.02.2020 16:59, Thierry Reding пишет:
> From: Thierry Reding <treding at nvidia.com>
> 
> Older Tegra devices only allow addressing 32 bits of memory, so whether
> or not the host1x is attached to an IOMMU doesn't matter. host1x IOMMU
> attachment is only needed on devices that can address memory beyond the
> 32-bit boundary and where the host1x doesn't support the wide GATHER
> opcode that allows it to access buffers at higher addresses.
> 
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>  drivers/gpu/drm/tegra/drm.c | 49 ++++++++++++++++++++++++-------------
>  1 file changed, 32 insertions(+), 17 deletions(-)

Tested-by: Dmitry Osipenko <digetx at gmail.com>