The ES8328 codec has differential/single-ended microphone inputs
(LINPUT1/RINPUT1, LINPUT2/RINPUT2) that require connection to the
internal Mic Bias generator for proper operation. Currently, these
routes are missing, which can cause microphone recording to fail.

Add the missing DAPM routes to link the input pins to the Mic Bias
supply, ensuring the microphone bias voltage is correctly applied.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
PS:
I'm not sure if this patch is also required for other platforms using
the ES8328. If not, I'll drop the patch and add this DAPM route to the
`audio-routing` property of the Loongson ASoC machine driver.

 sound/soc/codecs/es8328.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/codecs/es8328.c b/sound/soc/codecs/es8328.c
index 9838fe42cb6f..aaa6646ad4c5 100644
--- a/sound/soc/codecs/es8328.c
+++ b/sound/soc/codecs/es8328.c

@@ -405,6 +405,11 @@ static const struct snd_soc_dapm_route es8328_dapm_routes[] = {
 
 	{ "Mic Bias", NULL, "Mic Bias Gen" },
 
+	{ "LINPUT1", NULL, "Mic Bias" },
+	{ "RINPUT1", NULL, "Mic Bias" },
+	{ "LINPUT2", NULL, "Mic Bias" },
+	{ "RINPUT2", NULL, "Mic Bias" },
+
 	{ "Left Mixer", NULL, "Left DAC" },
 	{ "Left Mixer", "Left Bypass Switch", "Left Line Mux" },
 	{ "Left Mixer", "Right Playback Switch", "Right DAC" },

-- 
2.52.0