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| author | Robin Murphy <robin.murphy@arm.com> | 2022-10-20 15:23:40 +0100 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2022-11-18 09:33:20 +0100 |
| commit | c2418f911a31a266af4fbaca998dc73d3676475a (patch) | |
| tree | 02493700f63f8d039f114556e3e3d662c1c74723 /drivers/gpu/host1x/dev.c | |
| parent | 9abf2313adc1ca1b6180c508c25f22f9395cc780 (diff) | |
| download | linux-c2418f911a31a266af4fbaca998dc73d3676475a.tar.gz linux-c2418f911a31a266af4fbaca998dc73d3676475a.tar.bz2 linux-c2418f911a31a266af4fbaca998dc73d3676475a.zip | |
gpu: host1x: Avoid trying to use GART on Tegra20
Since commit c7e3ca515e78 ("iommu/tegra: gart: Do not register with
bus") quite some time ago, the GART driver has effectively disabled
itself to avoid issues with the GPU driver expecting it to work in ways
that it doesn't. As of commit 57365a04c921 ("iommu: Move bus setup to
IOMMU device registration") that bodge no longer works, but really the
GPU driver should be responsible for its own behaviour anyway. Make the
workaround explicit.
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Suggested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/host1x/dev.c')
| -rw-r--r-- | drivers/gpu/host1x/dev.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 0cd3f97e7e49..f60ea24db0ec 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -292,6 +292,10 @@ static void host1x_setup_virtualization_tables(struct host1x *host) static bool host1x_wants_iommu(struct host1x *host1x) { + /* Our IOMMU usage policy doesn't currently play well with GART */ + if (of_machine_is_compatible("nvidia,tegra20")) + return false; + /* * If we support addressing a maximum of 32 bits of physical memory * and if the host1x firewall is enabled, there's no need to enable |