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serial: 8250: Let drivers request full 16550A feature probing

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commit 9906890c89 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: dc56ecb81a ("serial: 8250: Support disabling mdelay-filled probes of 16550A variants")
Cc: stable@vger.kernel.org # v5.6+
Reported-by: Anders Blomdell <anders.blomdell@control.lth.se>
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2209202357520.41633@angie.orcam.me.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maciej W. Rozycki 2022-09-21 00:35:32 +01:00 committed by Greg Kroah-Hartman
parent 26e5c79e67
commit 63a3d75cf1
2 changed files with 4 additions and 2 deletions
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3
drivers/tty/serial/8250/8250_port.c
View file

@ -1029,7 +1029,8 @@ static void autoconfig_16550a(struct uart_8250_port *up)
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;
/*

3
include/linux/serial_core.h
View file

@ -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)