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authorDave Airlie <airlied@redhat.com>2022-11-18 21:15:20 +0100
committerDave Airlie <airlied@redhat.com>2022-11-18 21:15:37 +0100
commitb1010b93fe9074f965ebf86e0e382a8a7a71500d (patch)
treee663a432b9968286c7b682bb60b0ed30271e7d24 /drivers/gpu
parentMerge tag 'amd-drm-fixes-6.1-2022-11-16' of https://gitlab.freedesktop.org/ag... (diff)
parentgpu: host1x: Avoid trying to use GART on Tegra20 (diff)
downloadlinux-b1010b93fe9074f965ebf86e0e382a8a7a71500d.tar.xz
linux-b1010b93fe9074f965ebf86e0e382a8a7a71500d.zip
Merge tag 'drm/tegra/for-6.1-rc6' of https://gitlab.freedesktop.org/drm/tegra into drm-fixes
drm/tegra: Fixes for v6.1-rc6 This contains a single fix that avoids using the GART on Tegra20 because it doesn't work well with the way the Tegra DRM driver tries to use it. Signed-off-by: Dave Airlie <airlied@redhat.com> From: Thierry Reding <thierry.reding@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221118121614.3511110-1-thierry.reding@gmail.com
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/tegra/drm.c4
-rw-r--r--drivers/gpu/host1x/dev.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 6748ec1e0005..a1f909dac89a 100644
--- 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
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