ASoC: tas2764: Fix amp gain register offset & default

The register default is 0x28 per the datasheet, and the amp gain field
is supposed to be shifted left by one. With the wrong default, the ALSA
controls lie about the power-up state. With the wrong shift, we get only
half the gain we expect.
Signed-off-by: Hector Martin <marcan@marcan.st>
Fixes: 827ed8a0 ("ASoC: tas2764: Add the driver for the TAS2764")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220630075135.2221-4-povik+lin@cutebit.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2764.c

@@ -541,7 +541,7 @@ static DECLARE_TLV_DB_SCALE(tas2764_playback_volume, -10050, 50, 1);
 static const struct snd_kcontrol_new tas2764_snd_controls[] = {
 	SOC_SINGLE_TLV("Speaker Volume", TAS2764_DVC, 0,
 		       TAS2764_DVC_MAX, 1, tas2764_playback_volume),
-	SOC_SINGLE_TLV("Amp Gain Volume", TAS2764_CHNL_0, 0, 0x14, 0,
+	SOC_SINGLE_TLV("Amp Gain Volume", TAS2764_CHNL_0, 1, 0x14, 0,
 		       tas2764_digital_tlv),
 };
 
@@ -566,7 +566,7 @@ static const struct reg_default tas2764_reg_defaults[] = {
 	{ TAS2764_SW_RST, 0x00 },
 	{ TAS2764_PWR_CTRL, 0x1a },
 	{ TAS2764_DVC, 0x00 },
-	{ TAS2764_CHNL_0, 0x00 },
+	{ TAS2764_CHNL_0, 0x28 },
 	{ TAS2764_TDM_CFG0, 0x09 },
 	{ TAS2764_TDM_CFG1, 0x02 },
 	{ TAS2764_TDM_CFG2, 0x0a },