提交 0b41ce99 编写于 作者: S Sebastian Frias 提交者: Greg Kroah-Hartman

8250: use callbacks to access UART_DLL/UART_DLM

Some UART HW has a single register combining UART_DLL/UART_DLM
(this was probably forgotten in the change that introduced the
callbacks, commit b32b19b8)

Fixes: b32b19b8 ("[SERIAL] 8250: set divisor register correctly ...")
Signed-off-by: NSebastian Frias <sf84@laposte.net>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 aaa68c50
......@@ -813,22 +813,16 @@ 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 int id;
unsigned char old_lcr;
unsigned int id, old_dl;
old_lcr = serial_in(p, UART_LCR);
serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
old_dl = serial_dl_read(p);
serial_dl_write(p, 0);
id = serial_dl_read(p);
serial_dl_write(p, old_dl);
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);
id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
serial_out(p, UART_DLL, old_dll);
serial_out(p, UART_DLM, old_dlm);
serial_out(p, UART_LCR, old_lcr);
return id;
......
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