drm/amdgpu: enabled software IH ring for Vega

Seems like we won't get the hardware IH1/2 rings on Vega20 working.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vega10_ih.c

@@ -91,6 +91,9 @@ static void vega10_ih_enable_interrupts(struct amdgpu_device *adev)
 		}
 		adev->irq.ih2.enabled = true;
 	}
+
+	if (adev->irq.ih_soft.ring_size)
+		adev->irq.ih_soft.enabled = true;
 }
 
 /**
@@ -606,6 +609,10 @@ static int vega10_ih_sw_init(void *handle)
 	adev->irq.ih2.use_doorbell = true;
 	adev->irq.ih2.doorbell_index = (adev->doorbell_index.ih + 2) << 1;
 
+	r = amdgpu_ih_ring_init(adev, &adev->irq.ih_soft, PAGE_SIZE, true);
+	if (r)
+		return r;
+
 	r = amdgpu_irq_init(adev);
 
 	return r;