Reviewed-by: Mikko Perttunen <mperttunen@xxxxxxxxxx> On 30/08/2018 9.12, Dmitry Osipenko wrote:
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@xxxxxxxxx> --- Changelog: v2: Correctly placed the detachment code, now Host1x is detached regardless of the firewall state. v3: Compiles now. 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 d88073e7d22d..de6bc4e7fa23 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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