drm/amdgpu: fix description of vm_size module parameter (v2)

default is 8GB, not 4GB.

v2: fix fallback setting when the user provides an invalid input
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -968,13 +968,13 @@ static void amdgpu_check_arguments(struct amdgpu_device *adev)
 	if (!amdgpu_check_pot_argument(amdgpu_vm_size)) {
 		dev_warn(adev->dev, "VM size (%d) must be a power of 2\n",
 			 amdgpu_vm_size);
-		amdgpu_vm_size = 4;
+		amdgpu_vm_size = 8;
 	}
 
 	if (amdgpu_vm_size < 1) {
 		dev_warn(adev->dev, "VM size (%d) too small, min is 1GB\n",
 			 amdgpu_vm_size);
-		amdgpu_vm_size = 4;
+		amdgpu_vm_size = 8;
 	}
 
 	/*
@@ -983,7 +983,7 @@ static void amdgpu_check_arguments(struct amdgpu_device *adev)
 	if (amdgpu_vm_size > 1024) {
 		dev_warn(adev->dev, "VM size (%d) too large, max is 1TB\n",
 			 amdgpu_vm_size);
-		amdgpu_vm_size = 4;
+		amdgpu_vm_size = 8;
 	}
 
 	/* defines number of bits in page table versus page directory,

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -128,7 +128,7 @@ module_param_named(bapm, amdgpu_bapm, int, 0444);
 MODULE_PARM_DESC(deep_color, "Deep Color support (1 = enable, 0 = disable (default))");
 module_param_named(deep_color, amdgpu_deep_color, int, 0444);
 
-MODULE_PARM_DESC(vm_size, "VM address space size in gigabytes (default 4GB)");
+MODULE_PARM_DESC(vm_size, "VM address space size in gigabytes (default 8GB)");
 module_param_named(vm_size, amdgpu_vm_size, int, 0444);
 
 MODULE_PARM_DESC(vm_block_size, "VM page table size in bits (default depending on vm_size)");