[PATCH 21/22] drm/tegra: Don't use IOMMU on Tegra20

[Dmitry Osipenko]

There is no IOMMU on Tegra20, instead a GART would be picked as an IOMMU
provider.

Signed-off-by: Dmitry Osipenko <digetx at gmail.com>
---
 drivers/gpu/drm/tegra/drm.c | 5 ++++-
 drivers/gpu/host1x/dev.c    | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 17416e1c219a..ac8f76d9475f 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -15,6 +15,8 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 
+#include <soc/tegra/fuse.h>
+
 #include "drm.h"
 #include "gem.h"
 
@@ -131,7 +133,8 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 	if (!tegra)
 		return -ENOMEM;
 
-	if (iommu_present(&platform_bus_type)) {
+	if (iommu_present(&platform_bus_type) &&
+	    tegra_get_chip_id() != TEGRA20) {
 		u64 carveout_start, carveout_end, gem_start, gem_end;
 		struct iommu_domain_geometry *geometry;
 		unsigned long order;
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 5c1c711a21af..56b7e6d51894 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -25,6 +25,8 @@
 #include <linux/of.h>
 #include <linux/slab.h>
 
+#include <soc/tegra/fuse.h>
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/host1x.h>
 #undef CREATE_TRACE_POINTS
@@ -177,7 +179,8 @@ static int host1x_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	if (iommu_present(&platform_bus_type)) {
+	if (iommu_present(&platform_bus_type) &&
+	    tegra_get_chip_id() != TEGRA20) {
 		struct iommu_domain_geometry *geometry;
 		unsigned long order;
 
-- 
2.13.0