drm/amdgpu: add AMDGPU_MAX_SDMA_INSTANCES

Remove the hardcoded usage

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 34812ec..0be51f99 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -98,6 +98,9 @@
 #define AMDGPU_MAX_COMPUTE_RINGS		8
 #define AMDGPU_MAX_VCE_RINGS			2
 
+/* max number of IP instances */
+#define AMDGPU_MAX_SDMA_INSTANCES		2
+
 /* number of hw syncs before falling back on blocking */
 #define AMDGPU_NUM_SYNCS			4
 
@@ -2057,7 +2060,7 @@
 	struct amdgpu_gfx		gfx;
 
 	/* sdma */
-	struct amdgpu_sdma		sdma[2];
+	struct amdgpu_sdma		sdma[AMDGPU_MAX_SDMA_INSTANCES];
 	struct amdgpu_irq_src		sdma_trap_irq;
 	struct amdgpu_irq_src		sdma_illegal_inst_irq;