From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH] serial: 8250: Do XR17V35X specific wakeup in serial8250_do_startup Date: Thu, 16 Jul 2015 10:29:13 +0200 Message-ID: <1437035353-13708-1-git-send-email-joro@8bytes.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman , Jiri Slaby Cc: Peter Hurley , Sebastian Andrzej Siewior , Tony Lindgren , Alan Cox , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Joerg Roedel , Michael Welling , Joe Schultz List-Id: linux-serial@vger.kernel.org From: Joerg Roedel The XR17V35X UART needs the ECB bit set in its XR_EFR register to enable access to IER [7:5], ISR [5:4], FCR[5:4], MCR[7:5], and MSR [7:0]. Also reset the IER register to mask interrupts after access to all bits of this register has been enabled. This makes my 8-port XR17V35X working with the in-kernel serial driver. Cc: Peter Hurley Cc: Michael Welling Cc: Joe Schultz Signed-off-by: Joerg Roedel --- drivers/tty/serial/8250/8250_core.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 37fff12..4124a91 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2164,6 +2164,21 @@ int serial8250_do_startup(struct uart_port *port) */ enable_rsa(up); #endif + + if (port->type == PORT_XR17V35X) { + /* + * First enable access to IER [7:5], ISR [5:4], FCR [5:4], + * MCR [7:5] and MSR [7:0] + */ + serial_port_out(port, UART_XR_EFR, UART_EFR_ECB); + + /* + * Make sure all interrups are masked until initialization is + * complete and the FIFOs are cleared + */ + serial_port_out(port, UART_IER, 0); + } + /* * Clear the FIFO buffers and disable them. * (they will be reenabled in set_termios()) -- 1.9.1