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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2020-07-23 03:33:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 17:14:38 +0200 |
| commit | 868f3ee6e452bc2b89e68183a1700fcbbe0807b1 (patch) | |
| tree | 700afcd0bd5bb9e28082f9a9245bc498cb464b7d /include/linux/serial_8250.h | |
| parent | 699cc4dfd14071e4843e2fde8ce01f09871eb318 (diff) | |
| download | linux-stable-868f3ee6e452bc2b89e68183a1700fcbbe0807b1.tar.gz linux-stable-868f3ee6e452bc2b89e68183a1700fcbbe0807b1.tar.bz2 linux-stable-868f3ee6e452bc2b89e68183a1700fcbbe0807b1.zip | |
serial: 8250: Add 8250 port clock update method
Some platforms can be designed in a way so the UART port reference clock
might be asynchronously changed at some point. In Baikal-T1 SoC this may
happen due to the reference clock being shared between two UART ports, on
the Allwinner SoC the reference clock is derived from the CPU clock, so
any CPU frequency change should get to be known/reflected by/in the UART
controller as well. But it's not enough to just update the
uart_port->uartclk field of the corresponding UART port, the 8250
controller reference clock divisor should be altered so to preserve
current baud rate setting. All of these things is done in a coherent
way by calling the serial8250_update_uartclk() method provided in this
patch. Though note that it isn't supposed to be called from within the
UART port callbacks because the locks using to the protect the UART port
data are already taken in there.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200723003357.26897-2-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/serial_8250.h')
| -rw-r--r-- | include/linux/serial_8250.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 6545f8cfc8fa..2b70f736b091 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -155,6 +155,8 @@ extern int early_serial_setup(struct uart_port *port); extern int early_serial8250_setup(struct earlycon_device *device, const char *options); +extern void serial8250_update_uartclk(struct uart_port *port, + unsigned int uartclk); extern void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old); extern void serial8250_do_set_ldisc(struct uart_port *port, |