drm/mediatek: add support for SPDIF audio in HDMI

add support for SPDIF audio  in HDMI
Signed-off-by: chunhui dai <chunhui.dai@mediatek.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>

drivers/gpu/drm/mediatek/mtk_hdmi.c

@@ -1576,6 +1576,11 @@ static int mtk_hdmi_audio_hw_params(struct device *dev, void *data,
 		hdmi_params.aud_i2s_fmt = HDMI_I2S_MODE_I2S_24BIT;
 		hdmi_params.aud_mclk = HDMI_AUD_MCLK_128FS;
 		break;
+	case HDMI_SPDIF:
+		hdmi_params.aud_codec = HDMI_AUDIO_CODING_TYPE_PCM;
+		hdmi_params.aud_sampe_size = HDMI_AUDIO_SAMPLE_SIZE_16;
+		hdmi_params.aud_input_type = HDMI_AUD_INPUT_SPDIF;
+		break;
 	default:
 		dev_err(hdmi->dev, "%s: Invalid DAI format %d\n", __func__,
 			daifmt->fmt);