drm/amdgpu: add vcn doorbell range function to nbio7.4 (v2)

To setup the aperture for VCN2.5

v2: setup vcn doorbells in vcn2.5 hw_init (Alex)
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c

@@ -114,6 +114,26 @@ static void nbio_v7_4_sdma_doorbell_range(struct amdgpu_device *adev, int instan
 	WREG32(reg, doorbell_range);
 }
 
+static void nbio_v7_4_vcn_doorbell_range(struct amdgpu_device *adev, bool use_doorbell,
+					 int doorbell_index)
+{
+	u32 reg = SOC15_REG_OFFSET(NBIO, 0, mmBIF_MMSCH0_DOORBELL_RANGE);
+
+	u32 doorbell_range = RREG32(reg);
+
+	if (use_doorbell) {
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       BIF_MMSCH0_DOORBELL_RANGE, OFFSET,
+					       doorbell_index);
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       BIF_MMSCH0_DOORBELL_RANGE, SIZE, 8);
+	} else
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       BIF_MMSCH0_DOORBELL_RANGE, SIZE, 0);
+
+	WREG32(reg, doorbell_range);
+}
+
 static void nbio_v7_4_enable_doorbell_aperture(struct amdgpu_device *adev,
 					       bool enable)
 {
@@ -292,6 +312,7 @@ const struct amdgpu_nbio_funcs nbio_v7_4_funcs = {
 	.hdp_flush = nbio_v7_4_hdp_flush,
 	.get_memsize = nbio_v7_4_get_memsize,
 	.sdma_doorbell_range = nbio_v7_4_sdma_doorbell_range,
+	.vcn_doorbell_range = nbio_v7_4_vcn_doorbell_range,
 	.enable_doorbell_aperture = nbio_v7_4_enable_doorbell_aperture,
 	.enable_doorbell_selfring_aperture = nbio_v7_4_enable_doorbell_selfring_aperture,
 	.ih_doorbell_range = nbio_v7_4_ih_doorbell_range,

drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c

@@ -205,6 +205,9 @@ static int vcn_v2_5_hw_init(void *handle)
 	struct amdgpu_ring *ring = &adev->vcn.ring_dec;
 	int i, r;
 
+	adev->nbio_funcs->vcn_doorbell_range(adev, ring->use_doorbell,
+		ring->doorbell_index);
+
 	r = amdgpu_ring_test_ring(ring);
 	if (r) {
 		ring->sched.ready = false;