ASoC: sun4i-spdif: Add TX fifo bit flush quirks

Allwinner H6 has a different bit to flush the TX FIFO.

Add a quirks to prepare introduction of H6 SoC.
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sunxi/sun4i-spdif.c

@@ -166,10 +166,12 @@
  *
  * @reg_dac_tx_data: TX FIFO offset for DMA config.
  * @has_reset: SoC needs reset deasserted.
+ * @val_fctl_ftx: TX FIFO flush bitmask.
  */
 struct sun4i_spdif_quirks {
 	unsigned int reg_dac_txdata;
 	bool has_reset;
+	unsigned int val_fctl_ftx;
 };
 
 struct sun4i_spdif_dev {
@@ -180,16 +182,19 @@ struct sun4i_spdif_dev {
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct regmap *regmap;
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
+	const struct sun4i_spdif_quirks *quirks;
 };
 
 static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
 {
+	const struct sun4i_spdif_quirks *quirks = host->quirks;
+
 	/* soft reset SPDIF */
 	regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
 
 	/* flush TX FIFO */
 	regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
-			   SUN4I_SPDIF_FCTL_FTX, SUN4I_SPDIF_FCTL_FTX);
+			   quirks->val_fctl_ftx, quirks->val_fctl_ftx);
 
 	/* clear TX counter */
 	regmap_write(host->regmap, SUN4I_SPDIF_TXCNT, 0);
@@ -418,15 +423,18 @@ static struct snd_soc_dai_driver sun4i_spdif_dai = {
 
 static const struct sun4i_spdif_quirks sun4i_a10_spdif_quirks = {
 	.reg_dac_txdata	= SUN4I_SPDIF_TXFIFO,
+	.val_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
 };
 
 static const struct sun4i_spdif_quirks sun6i_a31_spdif_quirks = {
 	.reg_dac_txdata	= SUN4I_SPDIF_TXFIFO,
+	.val_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
 	.has_reset	= true,
 };
 
 static const struct sun4i_spdif_quirks sun8i_h3_spdif_quirks = {
 	.reg_dac_txdata	= SUN8I_SPDIF_TXFIFO,
+	.val_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
 	.has_reset	= true,
 };
 
@@ -507,6 +515,7 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Failed to determine the quirks to use\n");
 		return -ENODEV;
 	}
+	host->quirks = quirks;
 
 	host->regmap = devm_regmap_init_mmio(&pdev->dev, base,
 						&sun4i_spdif_regmap_config);