The case of CONFIG_ARM_DMA_USE_IOMMU=y was found to be broken for
DRM driver. Add back the workaround using arm_iommu_detach_device()
as a temporary solution.
Cc: sta...@vger.kernel.org
Fixes: fa6661b7aa0b ("drm/tegra: Optionally attach clients to the IOMMU")
Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
drivers/gpu/drm/tegra/drm.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 90709c38c993..a949cb678e08 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -20,6 +20,10 @@
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+#include <asm/dma-iommu.h>
+#endif
+
#include "drm.h"
#include "gem.h"
@@ -909,6 +913,17 @@ int host1x_client_iommu_attach(struct host1x_client
*client)
struct iommu_group *group = NULL;
int err;
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+ if (client->dev->archdata.mapping) {
+ struct dma_iommu_mapping *mapping =
+ to_dma_iommu_mapping(client->dev);
+ arm_iommu_detach_device(client->dev);
+ arm_iommu_release_mapping(mapping);
+
+ domain = iommu_get_domain_for_dev(client->dev);
+ }
+#endif
+
/*
* If the host1x client is already attached to an IOMMU domain that is
* not the shared IOMMU domain, don't try to attach it to a different
--
2.30.2
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