ASoC: rt5514: Guard Hotword Model bytes loading

If the rt5514-spi driver is not enabled in kernel, hotword model will
not be loaded when "DSP Voice Wake Up" is set to turn on DSP mode, and
an error is logged instead.
Signed-off-by: Hsin-Yu Chao <hychao@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5514.c

@@ -302,7 +302,6 @@ static int rt5514_dsp_voice_wake_up_put(struct snd_kcontrol *kcontrol,
 	struct rt5514_priv *rt5514 = snd_soc_component_get_drvdata(component);
 	struct snd_soc_codec *codec = rt5514->codec;
 	const struct firmware *fw = NULL;
-	int ret = 0;
 
 	if (ucontrol->value.integer.value[0] == rt5514->dsp_enabled)
 		return 0;
@@ -340,6 +339,9 @@ static int rt5514_dsp_voice_wake_up_put(struct snd_kcontrol *kcontrol,
 			}
 
 			if (rt5514->model_buf && rt5514->model_len) {
+#if IS_ENABLED(CONFIG_SND_SOC_RT5514_SPI)
+				int ret;
+
 				ret = rt5514_spi_burst_write(0x4ff80000,
 					rt5514->model_buf,
 					((rt5514->model_len / 8) + 1) * 8);
@@ -348,13 +350,22 @@ static int rt5514_dsp_voice_wake_up_put(struct snd_kcontrol *kcontrol,
 						"Model load failed %d\n", ret);
 					return ret;
 				}
+#else
+				dev_err(codec->dev,
+					"No SPI driver for loading firmware\n");
+#endif
 			} else {
 				request_firmware(&fw, RT5514_FIRMWARE3,
 						 codec->dev);
 				if (fw) {
+#if IS_ENABLED(CONFIG_SND_SOC_RT5514_SPI)
 					rt5514_spi_burst_write(0x4ff80000,
 						fw->data,
 						((fw->size/8)+1)*8);
+#else
+					dev_err(codec->dev,
+						"No SPI driver to load fw\n");
+#endif
 					release_firmware(fw);
 					fw = NULL;
 				}