[PATCH] use callbacks to access UART_DLL/UART_DLM
From: Sebastian Frias <hidden>
Date: 2015-12-17 16:06:43
Also in:
lkml
--- resending as plain-text --- drivers/tty/serial/8250/8250_core.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 2c46a21..9ca863c 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c@@ -791,22 +791,19 @@ static int size_fifo(struct uart_8250_port *up) */ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) { - unsigned char old_dll, old_dlm, old_lcr; + unsigned char old_lcr; unsigned int id; + unsigned int old_dl; old_lcr = serial_in(p, UART_LCR); - serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); - - old_dll = serial_in(p, UART_DLL); - old_dlm = serial_in(p, UART_DLM); - serial_out(p, UART_DLL, 0); - serial_out(p, UART_DLM, 0); + serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); - id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; + old_dl = serial_dl_read(p); + serial_dl_write(p, 0); + id = serial_dl_read(p); + serial_dl_write(p, old_dl); - serial_out(p, UART_DLL, old_dll); - serial_out(p, UART_DLM, old_dlm); serial_out(p, UART_LCR, old_lcr); return id;
--
1.7.10.4