From e31c8ea5aff8670275e4e451fdc3bca5fbc8a528 Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@gmail.com>
Date: Thu, 30 Aug 2018 03:12:47 +0300
Subject: [PATCH] gpu: host1x: Detach Host1x from IOMMU DMA domain on arm32
Host1x is getting attached to an implicit IOMMU DMA domain if
CONFIG_ARM_DMA_USE_IOMMU=y. Since Host1x driver manages IOMMU by
itself, Host1x device must be detached from the implicit domain using
arch-specific IOMMU-API.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpu/host1x/dev.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index d88073e7d22dd..de6bc4e7fa239 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -29,6 +29,10 @@
#include <trace/events/host1x.h>
#undef CREATE_TRACE_POINTS
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+#include <asm/dma-iommu.h>
+#endif
+
#include "bus.h"
#include "channel.h"
#include "debug.h"
@@ -217,7 +221,14 @@ static int host1x_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to get reset: %d\n", err);
return err;
}
-
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+ if (host->dev->archdata.mapping) {
+ struct dma_iommu_mapping *mapping =
+ to_dma_iommu_mapping(host->dev);
+ arm_iommu_detach_device(host->dev);
+ arm_iommu_release_mapping(mapping);
+ }
+#endif
if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
goto skip_iommu;
--
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