On 06/01/2017 11:36 AM, Dmitry Osipenko wrote:
On 23.05.2017 03:16, Dmitry Osipenko wrote:
There is no IOMMU on Tegra20, instead a GART would be picked as an IOMMU
provider.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
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;
Nicolas noticed that this breaks driver module compilation, as the
`tegra_get_chip_id` is not an exported symbol. I'll consider alternatives to
symbol exporting and will fix it in the new revision of the patch.
My recommendation is of_machine_is_compatible()
Cheers,
Mikko
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