diff options
| author |   Josh Triplett <josh@joshtriplett.org> | 2020-01-10 18:25:13 -0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-14 14:07:50 +0100 |
| commit | dc56ecb81a0aa46a7e127e916df5c8fdb8364f0b (patch) | |
| tree | 0c894a891cf091e0207b5a87cd7a434c5866c34b /drivers/tty | |
| parent | tty: serial: tegra: Optimize DMA buffer synchronization (diff) | |
| download | linux-dev-dc56ecb81a0aa46a7e127e916df5c8fdb8364f0b.tar.xz linux-dev-dc56ecb81a0aa46a7e127e916df5c8fdb8364f0b.zip | |
serial: 8250: Support disabling mdelay-filled probes of 16550A variants
The 8250 driver can probe for many variants of the venerable 16550A
serial port. Some of those probes involve long (20ms) mdelay calls,
which delay system boot. Modern systems and virtual machines don't have
those variants.
Provide a Kconfig option to disable probes for 16550A variants.
Disabling this speeds up the boot of a virtual machine with a serial
console by more than 20ms (a substantial fraction of the ~100ms needed
to boot a carefully configured VM).
Before:
[ +0.021919] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
After:
[ +0.000097] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Link: https://lore.kernel.org/r/20200111022513.GA166267@localhost
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 3 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/Kconfig | 10 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 8243f280a2ec..c4330d40c638 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -997,6 +997,9 @@ 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)) + return; + /* * Check for presence of the EFR when DLAB is set. * Only ST16C650V1 UARTs pass this test. diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index fab3d4f20667..ffd167e886ae 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -60,6 +60,16 @@ config SERIAL_8250_PNP This builds standard PNP serial support. You may be able to disable this feature if you only need legacy serial support. +config SERIAL_8250_16550A_VARIANTS + bool "Support for variants of the 16550A serial port" + depends on SERIAL_8250 + help + The 8250 driver can probe for many variants of the venerable 16550A + serial port. Doing so takes additional time at boot. + + On modern systems, especially those using serial only for a simple + console, you can say N here. + config SERIAL_8250_FINTEK bool "Support for Fintek F81216A LPC to 4 UART RS485 API" depends on SERIAL_8250 |