openwrt/target/linux/bcm27xx/patches-5.4/950-1048-Hifiberry-DAC-ADC-Pro-fix-for-the-PLL-when-changing-.patch

From c70ae3d1923339746d156bd1d723d141113183aa Mon Sep 17 00:00:00 2001
From: Joerg Schambacher <joerg@i2audio.com>
Date: Mon, 1 Feb 2021 16:53:46 +0100
Subject: [PATCH] Hifiberry DAC+ADC Pro fix for the PLL when changing
 sample rates

Adds 2 msecs delay when switching between oscillators to allow
correct PLL settling.
Thanks to Clive Messer for the support!

Signed-off-by: Joerg Schambacher <joerg@hifiberry.com>
---
 sound/soc/bcm/hifiberry_dacplusadcpro.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

--- a/sound/soc/bcm/hifiberry_dacplusadcpro.c
+++ b/sound/soc/bcm/hifiberry_dacplusadcpro.c
@@ -190,6 +190,7 @@ static void snd_rpi_hifiberry_dacplusadc
 				PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
 		break;
 	}
+	usleep_range(2000, 2100);
 }
 
 static void snd_rpi_hifiberry_dacplusadcpro_clk_gpio(struct snd_soc_component *component)
@@ -207,13 +208,6 @@ static bool snd_rpi_hifiberry_dacplusadc
 	return (!(sck & 0x40));
 }
 
-static bool snd_rpi_hifiberry_dacplusadcpro_is_sclk_sleep(
-	struct snd_soc_component *component)
-{
-	msleep(2);
-	return snd_rpi_hifiberry_dacplusadcpro_is_sclk(component);
-}
-
 static bool snd_rpi_hifiberry_dacplusadcpro_is_pro_card(struct snd_soc_component *component)
 {
 	bool isClk44EN, isClk48En, isNoClk;
@@ -221,13 +215,13 @@ static bool snd_rpi_hifiberry_dacplusadc
 	snd_rpi_hifiberry_dacplusadcpro_clk_gpio(component);
 
 	snd_rpi_hifiberry_dacplusadcpro_select_clk(component, HIFIBERRY_DACPRO_CLK44EN);
-	isClk44EN = snd_rpi_hifiberry_dacplusadcpro_is_sclk_sleep(component);
+	isClk44EN = snd_rpi_hifiberry_dacplusadcpro_is_sclk(component);
 
 	snd_rpi_hifiberry_dacplusadcpro_select_clk(component, HIFIBERRY_DACPRO_NOCLOCK);
-	isNoClk = snd_rpi_hifiberry_dacplusadcpro_is_sclk_sleep(component);
+	isNoClk = snd_rpi_hifiberry_dacplusadcpro_is_sclk(component);
 
 	snd_rpi_hifiberry_dacplusadcpro_select_clk(component, HIFIBERRY_DACPRO_CLK48EN);
-	isClk48En = snd_rpi_hifiberry_dacplusadcpro_is_sclk_sleep(component);
+	isClk48En = snd_rpi_hifiberry_dacplusadcpro_is_sclk(component);
 
 	return (isClk44EN && isClk48En && !isNoClk);
 }