diff --git a/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c b/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c
index 4470df45b7ea..d6554add485c 100644
--- a/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c
@@ -307,6 +307,16 @@ static int ih_v6_0_enable_ring(struct amdgpu_device *adev,
 	return 0;
 }
 
+static uint32_t ih_v6_0_setup_retry_doorbell(u32 doorbell_index)
+{
+	u32 val = 0;
+
+	val = REG_SET_FIELD(val, IH_DOORBELL_RPTR, OFFSET, doorbell_index);
+	val = REG_SET_FIELD(val, IH_DOORBELL_RPTR, ENABLE, 1);
+
+	return val;
+}
+
 /**
  * ih_v6_0_irq_init - init and enable the interrupt ring
  *
@@ -392,6 +402,21 @@ static int ih_v6_0_irq_init(struct amdgpu_device *adev)
 
 	pci_set_master(adev->pdev);
 
+	if (!(adev->flags & AMD_IS_APU)) {
+		/* Allocate the doorbell for IH Retry CAM */
+		adev->irq.retry_cam_doorbell_index = (adev->doorbell_index.ih + 2) << 1;
+		WREG32_SOC15(OSSSYS, 0, regIH_DOORBELL_RETRY_CAM,
+			     ih_v6_0_setup_retry_doorbell(adev->irq.retry_cam_doorbell_index));
+
+		/* Enable IH Retry CAM */
+		tmp = RREG32_SOC15(OSSSYS, 0, regIH_RETRY_INT_CAM_CNTL);
+		tmp = REG_SET_FIELD(tmp, IH_RETRY_INT_CAM_CNTL, ENABLE, 1);
+		tmp = REG_SET_FIELD(tmp, IH_RETRY_INT_CAM_CNTL, CAM_SIZE, 0xF);
+		WREG32_SOC15(OSSSYS, 0, regIH_RETRY_INT_CAM_CNTL, tmp);
+
+		adev->irq.retry_cam_enabled = true;
+	}
+
 	/* enable interrupts */
 	ret = ih_v6_0_toggle_interrupts(adev, true);
 	if (ret)
diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v4_3.c b/drivers/gpu/drm/amd/amdgpu/nbio_v4_3.c
index f89e5f40e1a5..a66e3073aed8 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v4_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v4_3.c
@@ -199,7 +199,7 @@ static void nbio_v4_3_ih_doorbell_range(struct amdgpu_device *adev,
 		ih_doorbell_range = REG_SET_FIELD(ih_doorbell_range,
 						  S2A_DOORBELL_ENTRY_1_CTRL,
 						  S2A_DOORBELL_PORT1_RANGE_SIZE,
-						  2);
+						  8);
 		ih_doorbell_range = REG_SET_FIELD(ih_doorbell_range,
 						  S2A_DOORBELL_ENTRY_1_CTRL,
 						  S2A_DOORBELL_PORT1_AWADDR_31_28_VALUE,