drm/tegra: Relax IOMMU usage criteria on old Tegra

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commit 2d9384ff91 upstream.

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.

Cc: <stable@vger.kernel.org> # v5.5
Signed-off-by: Thierry Reding <treding@nvidia.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Thierry Reding 2020-02-04 14:59:24 +01:00 • committed by Greg Kroah-Hartman

parent 8420e2c102

commit d71c74b18d

1 changed files with 32 additions and 17 deletions

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drivers/gpu/drm/tegra/drm.c

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