[alsa-devel] [RFC PATCH 02/34] ASoC: sun8i-codec: LRCK is not inverted on A64

[Samuel Holland]

On the A64 (tested with the Pinephone), the current code causes the
left/right channels to be swapped during I2S playback from the CPU on
AIF1, and breaks DSP_A communication with the modem on AIF2.

Trusting that the comment in the code is correct, the existing behavior
is kept for the A33.

Cc: stable at kernel.org
Fixes: ec4a95409d5c ("arm64: dts: allwinner: a64: add nodes necessary for analog sound support")
Signed-off-by: Samuel Holland <samuel at sholland.org>
---
 sound/soc/sunxi/sun8i-codec.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index 55798bc8eae2..14cf31f5c535 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -13,6 +13,7 @@
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/log2.h>
@@ -89,6 +90,7 @@ struct sun8i_codec {
 	struct regmap	*regmap;
 	struct clk	*clk_module;
 	struct clk	*clk_bus;
+	bool		inverted_lrck;
 };
 
 static int sun8i_codec_runtime_resume(struct device *dev)
@@ -209,18 +211,19 @@ static int sun8i_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 			   value << SUN8I_AIF1CLK_CTRL_AIF1_BCLK_INV);
 
 	/*
-	 * It appears that the DAI and the codec don't share the same
-	 * polarity for the LRCK signal when they mean 'normal' and
-	 * 'inverted' in the datasheet.
+	 * It appears that the DAI and the codec in the A33 SoC don't
+	 * share the same polarity for the LRCK signal when they mean
+	 * 'normal' and 'inverted' in the datasheet.
 	 *
 	 * Since the DAI here is our regular i2s driver that have been
 	 * tested with way more codecs than just this one, it means
 	 * that the codec probably gets it backward, and we have to
 	 * invert the value here.
 	 */
+	value ^= scodec->inverted_lrck;
 	regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
 			   BIT(SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV),
-			   !value << SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV);
+			   value << SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV);
 
 	/* DAI format */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
@@ -568,6 +571,8 @@ static int sun8i_codec_probe(struct platform_device *pdev)
 		return PTR_ERR(scodec->regmap);
 	}
 
+	scodec->inverted_lrck = (uintptr_t)of_device_get_match_data(&pdev->dev);
+
 	platform_set_drvdata(pdev, scodec);
 
 	pm_runtime_enable(&pdev->dev);
@@ -606,7 +611,14 @@ static int sun8i_codec_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id sun8i_codec_of_match[] = {
-	{ .compatible = "allwinner,sun8i-a33-codec" },
+	{
+		.compatible = "allwinner,sun8i-a33-codec",
+		.data = (void *)1,
+	},
+	{
+		.compatible = "allwinner,sun50i-a64-codec",
+		.data = (void *)0,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, sun8i_codec_of_match);
-- 
2.24.1