bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)

1 files changed, 56 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-1048-Hifiberry-DAC-ADC-Pro-fix-for-the-PLL-when-changing-.patch b/target/linux/bcm27xx/patches-5.4/950-1048-Hifiberry-DAC-ADC-Pro-fix-for-the-PLL-when-changing-.patch
new file mode 100644
index 0000000000..47ecb8b2ce
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-1048-Hifiberry-DAC-ADC-Pro-fix-for-the-PLL-when-changing-.patch
@@ -0,0 +1,56 @@
+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);
+ }