msm: kgsl: Set a nop command in setstate global memory
Add a nop command in the setstate memory which can be used during
in stream pagetable switching for synchronization
Change-Id: I01758fb24730a8df7807666320d3a02a1362e9a2
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c
index c2d46e2..6a86ea3 100644
--- a/drivers/gpu/msm/kgsl_iommu.c
+++ b/drivers/gpu/msm/kgsl_iommu.c
@@ -23,6 +23,7 @@
#include "kgsl_mmu.h"
#include "kgsl_sharedmem.h"
#include "kgsl_iommu.h"
+#include "adreno_pm4types.h"
/*
* kgsl_iommu_disable_clk - Disable iommu clocks
@@ -499,6 +500,12 @@
if (status)
goto done;
+ /* A nop is required in an indirect buffer when switching
+ * pagetables in-stream */
+ kgsl_sharedmem_writel(&mmu->setstate_memory,
+ KGSL_IOMMU_SETSTATE_NOP_OFFSET,
+ cp_nop_packet(1));
+
dev_info(mmu->device->dev, "|%s| MMU type set for device is IOMMU\n",
__func__);
done:
diff --git a/drivers/gpu/msm/kgsl_iommu.h b/drivers/gpu/msm/kgsl_iommu.h
index c2e84a6..d4de656 100644
--- a/drivers/gpu/msm/kgsl_iommu.h
+++ b/drivers/gpu/msm/kgsl_iommu.h
@@ -55,6 +55,9 @@
(pt_val & ~(KGSL_IOMMU_TTBR0_PA_MASK << \
KGSL_IOMMU_TTBR0_PA_SHIFT))
+/* offset at which a nop command is placed in setstate_memory */
+#define KGSL_IOMMU_SETSTATE_NOP_OFFSET 1024
+
/*
* struct kgsl_iommu_device - Structure holding data about iommu contexts
* @dev: Device pointer to iommu context