The case of CONFIG_ARM_DMA_USE_IOMMU=y was found to be broken for
host1x driver. Add back the workaround using arm_iommu_detach_device()
as a temporary solution.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: af1cbfb9bf0f ("gpu: host1x: Support DMA mapping of buffers"
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/gpu/host1x/dev.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index d0ebb70e2fdd..a2c09dca4eef 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -18,6 +18,10 @@
#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"
@@ -232,6 +236,17 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
int 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);
+
+ domain = iommu_get_domain_for_dev(host->dev);
+ }
+#endif
+
/*
* We may not always want to enable IOMMU support (for example if the
* host1x firewall is already enabled and we don't support addressing
--
2.30.2
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