[PATCH 09/11] gpu: host1x: Drop release of legacy 32-bit ARM DMA domain

[Mikko Perttunen]

host1x_iommu_attach currently detaches a possible ARM DMA mapping on the
device, since it would get in the way of the shared domain host1x wants.

We are about to enable default domain based DMA domains for Host1x and
TegraDRM devices. These will take the same path as on 64-bit ARM, but
we need to avoid trying to detach the now perfectly functional mapping
on the device, so get rid of that code.

Strictly speaking, the code removed here would not be harmful but would
cause WARNs to happen.

nouveau and tegra-vde have the same construct, but their clients stay on
identity domains for now, so those copies are left alone.

Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
 drivers/gpu/host1x/dev.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 3f475f0e6545..27ca523a6ada 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -23,10 +23,6 @@
 #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 "context.h"
@@ -379,17 +375,6 @@ 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

-- 
2.55.0