openwrt/target/linux/bcm27xx/patches-5.15/950-0056-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch
John Audia 4921ab0be4 kernel: bump 5.15 to 5.15.56
Manually rebased:
  bcm27xx/patches-5.15/950-0470-sound-usb-add-device-quirks-for-A4Tech-FHD-1080p-web.patch

Remove upstreamed:
  bcm27xx/patches-5.15/950-0060-tty-amba-pl011-Add-un-throttle-support.patch[1]

All other patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.56&id=2db3b95166f72e6481a79b82b1d6f94f4b18fcc1

Build system: x86_64
Build-tested: bcm2711/RPi4B, mt7622/RT3200
Run-tested: bcm2711/RPi4B, mt7622/RT3200

Signed-off-by: John Audia <therealgraysky@proton.me>
2022-07-31 18:55:22 +02:00

30 lines
1.1 KiB
Diff

From da6e94edb85fc948357b4163b6ddaa9e75f5e0df Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 23 Feb 2016 17:26:48 +0000
Subject: [PATCH] amba_pl011: Don't use DT aliases for numbering
The pl011 driver looks for DT aliases of the form "serial<n>",
and if found uses <n> as the device ID. This can cause
/dev/ttyAMA0 to become /dev/ttyAMA1, which is confusing if the
other serial port is provided by the 8250 driver which doesn't
use the same logic.
---
drivers/tty/serial/amba-pl011.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2744,7 +2744,12 @@ static int pl011_setup_port(struct devic
if (IS_ERR(base))
return PTR_ERR(base);
+ /* Don't use DT serial<n> aliases - it causes the device to
+ be renumbered to ttyAMA1 if it is the second serial port in the
+ system, even though the other one is ttyS0. The 8250 driver
+ doesn't use this logic, so always remains ttyS0.
index = pl011_probe_dt_alias(index, dev);
+ */
uap->old_cr = 0;
uap->port.dev = dev;