[PATCH] gpu: host1x: Avoid trying to use GART on Tegra20

[Robin Murphy]

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 at nvidia.com>
Suggested-by: Dmitry Osipenko <digetx at gmail.com>
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
 drivers/gpu/host1x/dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index a13fd9441edc..1cae8eea92cf 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -352,6 +352,10 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
 	if (!host1x_wants_iommu(host) || domain)
 		return domain;
 
+	/* Our IOMMU usage policy doesn't currently play well with GART */
+	if (of_machine_is_compatible("nvidia,tegra20"))
+		return NULL;
+
 	host->group = iommu_group_get(host->dev);
 	if (host->group) {
 		struct iommu_domain_geometry *geometry;
-- 
2.36.1.dirty