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serial: 8250_port: fix UART DL check when setting divisor.

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Signed-off-by: Steven Liu <steven.liu@rock-chips.com>
Change-Id: I907480ec39c6603bca7bb30e5f889bac3e57057c
This commit is contained in:
Steven Liu
2021-08-03 16:51:32 +08:00
committed by Tao Huang
parent be3327b6fb
commit 54ce82775f
1 changed files with 5 additions and 3 deletions
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8
drivers/tty/serial/8250/8250_port.c
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@@ -2674,14 +2674,16 @@ void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB);
serial_dl_write(up, quot);
#ifdef CONFIG_ARCH_ROCKCHIP
if (quot != serial_dl_read(up))
dev_warn_ratelimited(port->dev, "ttyS%d set divisor fail, quot:%d != dll,dlh:%d\n",
serial_index(port), quot, serial_dl_read(up));
#endif
if (port->type != PORT_16750)
serial_port_out(port, UART_LCR, up->lcr); /* reset DLAB */
#ifdef CONFIG_ARCH_ROCKCHIP
serial_port_out(port, UART_MCR, up->mcr);
if (quot != serial_dl_read(up))
pr_warn_ratelimited("ttyS%d set divisor fail, quot:%d != dll,dlh:%d\n",
serial_index(port), quot, serial_dl_read(up));
#endif
}
EXPORT_SYMBOL_GPL(serial8250_do_set_divisor);