msm: kgsl: Read global_pt property from IOMMU node

Enable global pagetable if global_pt property is set.

Change-Id: I8038e352110b617befc90dbae9258d3787a72fac
Signed-off-by: Rajesh Kemisetti <rajeshk@codeaurora.org>

Documentation/devicetree/bindings/iommu/msm_iommu_v1.txt

@@ -34,6 +34,8 @@ Optional properties:
 - qcom,iommu-pmu-event-classes: List of event classes supported.
 - Bus scaling properties: See msm_bus.txt
 - qcom,cb-base-offset: context bank 0's base address from global base address
+- qcom,global_pt : A boolean specifying if global pagetable should be used.
+  When not set we use per process pagetables for GPU.
 
 - List of sub nodes, one for each of the translation context banks supported.
   Each sub node has the following required properties:

drivers/gpu/msm/adreno.c

@@ -879,6 +879,9 @@ static int adreno_of_get_iommu(struct platform_device *pdev,
 	data->regstart = reg_val[0];
 	data->regsize = reg_val[1];
 
+	if (of_property_read_bool(node, "qcom,global_pt"))
+		data->features |= KGSL_MMU_GLOBAL_PAGETABLE;
+
 	data->iommu_ctx_count = 0;
 
 	for_each_child_of_node(node, child)