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gpu: host1x: Detach Host1x from IOMMU DMA domain on arm32

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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>
This commit is contained in:
Dmitry Osipenko 2018-08-30 03:12:47 +03:00 committed by Thierry Reding
parent 50bac83c80
commit e31c8ea5af
1 changed files with 12 additions and 1 deletions
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13
drivers/gpu/host1x/dev.c
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@ -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;