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authorÁlvaro Fernández Rojas <noltari@gmail.com>2021-08-21 10:54:34 +0200
committerÁlvaro Fernández Rojas <noltari@gmail.com>2021-08-21 19:07:07 +0200
commit8299d1f057439f94c6a4412e2e5c5082b82a30c9 (patch)
tree1bf678d61f11f7394493be464c7876e496f7faed /target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch
parent33b6885975ce376ff075362b7f0890326043111b (diff)
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bcm27xx: add kernel 5.10 support
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch28
1 files changed, 28 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch b/target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch
new file mode 100644
index 0000000000..304552f790
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.10/950-0277-serial-8250-bcm2835aux-defer-if-clock-is-zero.patch
@@ -0,0 +1,28 @@
+From e3af8dd4ba4fc1ae6260823dfb3a82236471c353 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Thu, 2 Jul 2020 13:53:20 +0100
+Subject: [PATCH] serial: 8250: bcm2835aux - defer if clock is zero
+
+See: https://github.com/raspberrypi/linux/issues/3700
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ drivers/tty/serial/8250/8250_bcm2835aux.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
++++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
+@@ -148,6 +148,13 @@ static int bcm2835aux_serial_probe(struc
+ */
+ up.port.uartclk = clk_get_rate(data->clk) * 2;
+
++ /* The clock is only queried at probe time, which means we get one shot
++ * at this. A zero clock is never going to work and is almost certainly
++ * due to a parent not being ready, so prefer to defer.
++ */
++ if (!up.port.uartclk)
++ return -EPROBE_DEFER;
++
+ /* register the port */
+ ret = serial8250_register_8250_port(&up);
+ if (ret < 0) {