From mboxrd@z Thu Jan 1 00:00:00 1970 From: Claudio Scordino Subject: atmel_serial: fix RTS high after initialization in RS485 mode Date: Sun, 24 Oct 2010 12:48:29 +0200 Message-ID: <4CC40EFD.8070000@evidence.eu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Nicolas Ferre Cc: "linux-serial@vger.kernel.org" , =?UTF-8?B?QXJrYWRpdXN6IEJ1YmHFgmE=?= , linux@maxim.org.za, linux-arm-kernel , Linux Kernel List-Id: linux-serial@vger.kernel.org Hi Nicolas, when working in RS485 mode, the atmel_serial driver keeps RTS high after the initialization of the serial port. It goes low only after the first character has been sent. This patch fixes this behavior. It has been already tested by Arkadiusz (CC:-ed). Best regards, Claudio atmel_serial: RTS line low after initialization of the serial port Signed-off-by: Claudio Scordino Signed-off-by: Arkadiusz Bubala --- drivers/serial/atmel_serial.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 3892666..85aa66f 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -1732,6 +1732,15 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev) device_init_wakeup(&pdev->dev, 1); platform_set_drvdata(pdev, port); + if (port->rs485.flags & SER_RS485_ENABLED) { + unsigned int control = 0; + unsigned int mode = 0; + control |= ATMEL_US_RTSEN; + mode |= ATMEL_US_USMODE_NORMAL; + UART_PUT_MR(&port->uart, mode); + UART_PUT_CR(&port->uart, control); + } + return 0; err_add_port: -- 1.6.0.4