This is a note to let you know that I've just added the patch titled
serial: 8250: Let drivers request full 16550A feature probing
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250-let-drivers-request-full-16550a-feature-probing.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9906890c89e4dbd900ed87ad3040080339a7f411 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@xxxxxxxxxxx>
Date: Wed, 21 Sep 2022 00:35:32 +0100
Subject: serial: 8250: Let drivers request full 16550A feature probing
From: Maciej W. Rozycki <macro@xxxxxxxxxxx>
commit 9906890c89e4dbd900ed87ad3040080339a7f411 upstream.
A SERIAL_8250_16550A_VARIANTS configuration option has been recently
defined that lets one request the 8250 driver not to probe for 16550A
device features so as to reduce the driver's device startup time in
virtual machines.
Some actual hardware devices require these features to have been fully
determined however for their driver to work correctly, so define a flag
to let drivers request full 16550A feature probing on a device-by-device
basis if required regardless of the SERIAL_8250_16550A_VARIANTS option
setting chosen.
Fixes: dc56ecb81a0a ("serial: 8250: Support disabling mdelay-filled probes of 16550A variants")
Cc: stable@xxxxxxxxxxxxxxx # v5.6+
Reported-by: Anders Blomdell <anders.blomdell@xxxxxxxxxxxxxx>
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2209202357520.41633@xxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_port.c | 3 ++-
include/linux/serial_core.h | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1021,7 +1021,8 @@ static void autoconfig_16550a(struct uar
up->port.type = PORT_16550A;
up->capabilities |= UART_CAP_FIFO;
- if (!IS_ENABLED(CONFIG_SERIAL_8250_16550A_VARIANTS))
+ if (!IS_ENABLED(CONFIG_SERIAL_8250_16550A_VARIANTS) &&
+ !(up->port.flags & UPF_FULL_PROBE))
return;
/*
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -100,7 +100,7 @@ struct uart_icount {
__u32 buf_overrun;
};
-typedef unsigned int __bitwise upf_t;
+typedef u64 __bitwise upf_t;
typedef unsigned int __bitwise upstat_t;
struct uart_port {
@@ -207,6 +207,7 @@ struct uart_port {
#define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
#define UPF_DEAD ((__force upf_t) (1 << 30))
#define UPF_IOREMAP ((__force upf_t) (1 << 31))
+#define UPF_FULL_PROBE ((__force upf_t) (1ULL << 32))
#define __UPF_CHANGE_MASK 0x17fff
#define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK)
Patches currently in stable-queue which might be from macro@xxxxxxxxxxx are
queue-5.10/serial-8250-let-drivers-request-full-16550a-feature-probing.patch
queue-5.10/risc-v-make-port-i-o-string-accessors-actually-work.patch
queue-5.10/pci-sanitise-firmware-bar-assignments-behind-a-pci-pci-bridge.patch
