openwrt/target/linux/bcm27xx/patches-6.1/950-1231-ASoC-dwc-Defer-bclk_ratio-handling-to-hw_params.patch

From dfc04900c40eb14f9364d56e96db2cc3340a1f21 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Wed, 3 Jan 2024 14:43:43 +0000
Subject: [PATCH] ASoC: dwc: Defer bclk_ratio handling to hw_params

bclk_ratio is only a factor in clock producer mode, and needs to
override the default value of num_channels * sample_size.
Move the bclk_ratio handling into the hw_params method, only latching
the value in set_bclk_ratio, to address both of those matters.

See: https://github.com/raspberrypi/linux/issues/5817

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 sound/soc/dwc/dwc-i2s.c | 38 +++++++++++++++++++++-----------------
 sound/soc/dwc/local.h   |  1 +
 2 files changed, 22 insertions(+), 17 deletions(-)

--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -263,6 +263,25 @@ static int dw_i2s_hw_params(struct snd_p
 		return -EINVAL;
 	}
 
+	if ((dev->capability & DW_I2S_MASTER) && dev->bclk_ratio) {
+		switch (dev->bclk_ratio) {
+		case 32:
+			dev->ccr = 0x00;
+			break;
+
+		case 48:
+			dev->ccr = 0x08;
+			break;
+
+		case 64:
+			dev->ccr = 0x10;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
 	config->chan_nr = params_channels(params);
 
 	switch (config->chan_nr) {
@@ -436,23 +455,7 @@ static int dw_i2s_set_bclk_ratio(struct
 
 	dev_dbg(dev->dev, "%s(%d)\n", __func__, ratio);
 
-	switch (ratio) {
-	case 32:
-		dev->ccr = 0x00;
-		break;
-
-	case 48:
-		dev->ccr = 0x08;
-		break;
-
-	case 64:
-		dev->ccr = 0x10;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	i2s_write_reg(dev->i2s_base, CCR, dev->ccr);
+	dev->bclk_ratio = ratio;
 
 	return 0;
 }
@@ -746,6 +749,7 @@ static int dw_i2s_probe(struct platform_
 		}
 	}
 
+	dev->bclk_ratio = 0;
 	dev->i2s_reg_comp1 = I2S_COMP_PARAM_1;
 	dev->i2s_reg_comp2 = I2S_COMP_PARAM_2;
 	if (pdata) {
--- a/sound/soc/dwc/local.h
+++ b/sound/soc/dwc/local.h
@@ -107,6 +107,7 @@ struct dw_i2s_dev {
 	unsigned int quirks;
 	unsigned int i2s_reg_comp1;
 	unsigned int i2s_reg_comp2;
+	unsigned int bclk_ratio;
 	struct device *dev;
 	u32 ccr;
 	u32 xfer_resolution;