drm/amdgpu: Correct and simplify sdma 4.x irq.num_types

Correct and init the sdma4.x irq.num_types.

v2: squash in fix (Alex)
Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

@@ -2599,27 +2599,18 @@ static const struct amdgpu_irq_src_funcs sdma_v4_0_srbm_write_irq_funcs = {
 
 static void sdma_v4_0_set_irq_funcs(struct amdgpu_device *adev)
 {
+	adev->sdma.trap_irq.num_types = adev->sdma.num_instances;
+	adev->sdma.ecc_irq.num_types = adev->sdma.num_instances;
+	/*For Arcturus and Aldebaran, add another 4 irq handler*/
 	switch (adev->sdma.num_instances) {
-	case 1:
-		adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE1;
-		adev->sdma.ecc_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE1;
-		break;
 	case 5:
-		adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE5;
-		adev->sdma.ecc_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE5;
-		break;
 	case 8:
-		adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
-		adev->sdma.ecc_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
-		adev->sdma.vm_hole_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE5;
-		adev->sdma.doorbell_invalid_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
-		adev->sdma.pool_timeout_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
-		adev->sdma.srbm_write_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
+		adev->sdma.vm_hole_irq.num_types = adev->sdma.num_instances;
+		adev->sdma.doorbell_invalid_irq.num_types = adev->sdma.num_instances;
+		adev->sdma.pool_timeout_irq.num_types = adev->sdma.num_instances;
+		adev->sdma.srbm_write_irq.num_types = adev->sdma.num_instances;
 		break;
-	case 2:
 	default:
-		adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE2;
-		adev->sdma.ecc_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE2;
 		break;
 	}
 	adev->sdma.trap_irq.funcs = &sdma_v4_0_trap_irq_funcs;