[PATCH 5.10 03/39] serial: 8250: Fix reporting real baudrate value in c_ospeed field

From: Greg Kroah-Hartman
Date: Wed Sep 21 2022 - 12:02:18 EST


From: Pali Rohár <pali@xxxxxxxxxx>

[ Upstream commit 32262e2e429cdb31f9e957e997d53458762931b7 ]

In most cases it is not possible to set exact baudrate value to hardware.

So fix reporting real baudrate value which was set to hardware via c_ospeed
termios field. It can be retrieved by ioctl(TCGETS2) from userspace.

Real baudrate value is calculated from chosen hardware divisor and base
clock. It is implemented in a new function serial8250_compute_baud_rate()
which is inverse of serial8250_get_divisor() function.

With this change is fixed also UART timeout value (it is updated via
uart_update_timeout() function), which is calculated from the now fixed
baudrate value too.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210927093704.19768-1-pali@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/tty/serial/8250/8250_port.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 9d60418e4adb..eaf4eb33a78d 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2547,6 +2547,19 @@ static unsigned int serial8250_get_divisor(struct uart_port *port,
return serial8250_do_get_divisor(port, baud, frac);
}

+static unsigned int serial8250_compute_baud_rate(struct uart_port *port,
+ unsigned int quot)
+{
+ if ((port->flags & UPF_MAGIC_MULTIPLIER) && quot == 0x8001)
+ return port->uartclk / 4;
+ else if ((port->flags & UPF_MAGIC_MULTIPLIER) && quot == 0x8002)
+ return port->uartclk / 8;
+ else if (port->type == PORT_NPCM)
+ return DIV_ROUND_CLOSEST(port->uartclk - 2 * (quot + 2), 16 * (quot + 2));
+ else
+ return DIV_ROUND_CLOSEST(port->uartclk, 16 * quot);
+}
+
static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
tcflag_t c_cflag)
{
@@ -2688,11 +2701,14 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)

baud = serial8250_get_baud_rate(port, termios, NULL);
quot = serial8250_get_divisor(port, baud, &frac);
+ baud = serial8250_compute_baud_rate(port, quot);

serial8250_rpm_get(up);
spin_lock_irqsave(&port->lock, flags);

uart_update_timeout(port, termios->c_cflag, baud);
+ if (tty_termios_baud_rate(termios))
+ tty_termios_encode_baud_rate(termios, baud, baud);

serial8250_set_divisor(port, baud, quot, frac);
serial_port_out(port, UART_LCR, up->lcr);
@@ -2726,6 +2742,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,

baud = serial8250_get_baud_rate(port, termios, old);
quot = serial8250_get_divisor(port, baud, &frac);
+ baud = serial8250_compute_baud_rate(port, quot);

/*
* Ok, we're now changing the port state. Do it with
--
2.35.1