drm/amdgpu: add vcn_doorbell_range callback for nbio 7.11

Implement support for setting up the VCN doorbell range for
NBIO 7.11.
Reviewed-by: Lang Yu <lang.yu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nbio_v7_11.c

@@ -100,6 +100,27 @@ static void nbio_v7_11_vpe_doorbell_range(struct amdgpu_device *adev, int instan
 	WREG32_PCIE_PORT(reg, doorbell_range);
 }
 
+static void nbio_v7_11_vcn_doorbell_range(struct amdgpu_device *adev,
+					  bool use_doorbell,
+					  int doorbell_index, int instance)
+{
+	u32 reg = SOC15_REG_OFFSET(NBIO, 0, regGDC0_BIF_VCN0_DOORBELL_RANGE);
+	u32 doorbell_range = RREG32_PCIE_PORT(reg);
+
+	if (use_doorbell) {
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       GDC0_BIF_VCN0_DOORBELL_RANGE, OFFSET,
+					       doorbell_index);
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       GDC0_BIF_VCN0_DOORBELL_RANGE, SIZE, 8);
+	} else {
+		doorbell_range = REG_SET_FIELD(doorbell_range,
+					       GDC0_BIF_VCN0_DOORBELL_RANGE, SIZE, 0);
+	}
+
+	WREG32_PCIE_PORT(reg, doorbell_range);
+}
+
 static void nbio_v7_11_enable_doorbell_aperture(struct amdgpu_device *adev,
 					       bool enable)
 {
@@ -256,6 +277,7 @@ const struct amdgpu_nbio_funcs nbio_v7_11_funcs = {
 	.mc_access_enable = nbio_v7_11_mc_access_enable,
 	.get_memsize = nbio_v7_11_get_memsize,
 	.sdma_doorbell_range = nbio_v7_11_sdma_doorbell_range,
+	.vcn_doorbell_range = nbio_v7_11_vcn_doorbell_range,
 	.vpe_doorbell_range = nbio_v7_11_vpe_doorbell_range,
 	.enable_doorbell_aperture = nbio_v7_11_enable_doorbell_aperture,
 	.enable_doorbell_selfring_aperture = nbio_v7_11_enable_doorbell_selfring_aperture,