gpu: host1x: Avoid trying to use GART on Tegra20

[platform/kernel/linux-starfive.git] / drivers / gpu / drm / tegra / drm.c

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 6748ec1..a1f909d 100644 (file)
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1093,6 +1093,10 @@ static bool host1x_drm_wants_iommu(struct host1x_device *dev)
        struct host1x *host1x = dev_get_drvdata(dev->dev.parent);
        struct iommu_domain *domain;
 
+       /* Our IOMMU usage policy doesn't currently play well with GART */
+       if (of_machine_is_compatible("nvidia,tegra20"))
+               return false;
+
        /*
         * If the Tegra DRM clients are backed by an IOMMU, push buffers are
         * likely to be allocated beyond the 32-bit boundary if sufficient