rpi sound cards: Fix Codec Zero rate switching

The Raspberry Pi Codec Zero (and IQaudIO Codec) don't notify the DA7213
codec when it needs to change PLL frequencies. As a result, audio can
be played at the wrong rate - play a 48kHz sound immediately after a
44.1kHz sound to see the effect, but in some configurations the codec
can lock into the wrong state and always get some rates wrong.

Add the necessary notification to fix the issue.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

sound/soc/bcm/iqaudio-codec.c

@@ -143,6 +143,7 @@ static int snd_rpi_iqaudio_codec_hw_params(struct snd_pcm_substream *substream,
 					   struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 	unsigned int samplerate = params_rate(params);
 
 	switch (samplerate) {
@@ -152,15 +153,17 @@ static int snd_rpi_iqaudio_codec_hw_params(struct snd_pcm_substream *substream,
 	case 48000:
 	case 96000:
 		pll_out = DA7213_PLL_FREQ_OUT_98304000;
-		return 0;
+		break;
 	case 44100:
 	case 88200:
 		pll_out = DA7213_PLL_FREQ_OUT_90316800;
-		return 0;
+		break;
 	default:
 		dev_err(rtd->dev,"Unsupported samplerate %d\n", samplerate);
 		return -EINVAL;
 	}
+
+	return snd_soc_dai_set_pll(codec_dai, 0, DA7213_SYSCLK_PLL, 0, pll_out);
 }
 
 static const struct snd_soc_ops snd_rpi_iqaudio_codec_ops = {