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| author | Maciej W. Rozycki <macro@orcam.me.uk> | 2022-09-21 02:35:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-10 20:14:14 +0300 |
| commit | e6da7808c955e609b3adf9d18b02f94463616016 (patch) | |
| tree | 2c99db2ec4d77e66ec4b0641ff5460a11fe29a36 /drivers | |
| parent | 95aa34f72132ee42ee3f632a5540c84a5ee8624f (diff) | |
| download | linux-e6da7808c955e609b3adf9d18b02f94463616016.tar.xz | |
serial: 8250: Let drivers request full 16550A feature probing
[ Upstream commit 9906890c89e4dbd900ed87ad3040080339a7f411 ]
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@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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 8b3756e4bb05..f648fd1d7548 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1023,7 +1023,8 @@ 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; /* |