From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752040AbcHLClg (ORCPT ); Thu, 11 Aug 2016 22:41:36 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:61273 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751258AbcHLClf (ORCPT ); Thu, 11 Aug 2016 22:41:35 -0400 From: Long Cheng To: Greg Kroah-Hartman , Jiri Slaby , Matthias Brugger CC: Eddie Huang , Peter Hurley , , , , , , Long Cheng Subject: [PATCH] serial: 8250_mtk: support big baud rate. Date: Fri, 12 Aug 2016 10:41:11 +0800 Message-ID: <1470969671-17235-1-git-send-email-long.cheng@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eddie Huang mediatek can support baud rate up to 4M. the 'uart_get_baud_rate' function will limit the max baud rate. Modify max baud to remove the limit. Signed-off-by: Long Cheng --- drivers/tty/serial/8250/8250_mtk.c | 6 +----- drivers/tty/serial/8250/8250_port.c | 4 +--- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 3611ec9..ce0cc47 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -62,7 +62,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - port->uartclk / 16); + port->uartclk); if (baud <= 115200) { serial_port_out(port, UART_MTK_HIGHS, 0x0); @@ -76,10 +76,6 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); - - /* Set to highest baudrate supported */ - if (baud >= 1152000) - baud = 921600; quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 7481b95..c45c1e3 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2504,8 +2504,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { - unsigned int tolerance = port->uartclk / 100; - /* * Ask the core to calculate the divisor for us. * Allow 1% tolerance at the upper limit so uart clks marginally @@ -2514,7 +2512,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, */ return uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - (port->uartclk + tolerance) / 16); + port->uartclk); } void -- 1.7.9.5 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Long Cheng Subject: [PATCH] serial: 8250_mtk: support big baud rate. Date: Fri, 12 Aug 2016 10:41:11 +0800 Message-ID: <1470969671-17235-1-git-send-email-long.cheng@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman , Jiri Slaby , Matthias Brugger Cc: Eddie Huang , Peter Hurley , linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, srv_heupstream@mediatek.com, Long Cheng List-Id: linux-serial@vger.kernel.org From: Eddie Huang mediatek can support baud rate up to 4M. the 'uart_get_baud_rate' function will limit the max baud rate. Modify max baud to remove the limit. Signed-off-by: Long Cheng --- drivers/tty/serial/8250/8250_mtk.c | 6 +----- drivers/tty/serial/8250/8250_port.c | 4 +--- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 3611ec9..ce0cc47 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -62,7 +62,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - port->uartclk / 16); + port->uartclk); if (baud <= 115200) { serial_port_out(port, UART_MTK_HIGHS, 0x0); @@ -76,10 +76,6 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); - - /* Set to highest baudrate supported */ - if (baud >= 1152000) - baud = 921600; quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 7481b95..c45c1e3 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2504,8 +2504,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { - unsigned int tolerance = port->uartclk / 100; - /* * Ask the core to calculate the divisor for us. * Allow 1% tolerance at the upper limit so uart clks marginally @@ -2514,7 +2512,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, */ return uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - (port->uartclk + tolerance) / 16); + port->uartclk); } void -- 1.7.9.5 From mboxrd@z Thu Jan 1 00:00:00 1970 From: long.cheng@mediatek.com (Long Cheng) Date: Fri, 12 Aug 2016 10:41:11 +0800 Subject: [PATCH] serial: 8250_mtk: support big baud rate. Message-ID: <1470969671-17235-1-git-send-email-long.cheng@mediatek.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Eddie Huang mediatek can support baud rate up to 4M. the 'uart_get_baud_rate' function will limit the max baud rate. Modify max baud to remove the limit. Signed-off-by: Long Cheng --- drivers/tty/serial/8250/8250_mtk.c | 6 +----- drivers/tty/serial/8250/8250_port.c | 4 +--- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 3611ec9..ce0cc47 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -62,7 +62,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - port->uartclk / 16); + port->uartclk); if (baud <= 115200) { serial_port_out(port, UART_MTK_HIGHS, 0x0); @@ -76,10 +76,6 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); - - /* Set to highest baudrate supported */ - if (baud >= 1152000) - baud = 921600; quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 7481b95..c45c1e3 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2504,8 +2504,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { - unsigned int tolerance = port->uartclk / 100; - /* * Ask the core to calculate the divisor for us. * Allow 1% tolerance at the upper limit so uart clks marginally @@ -2514,7 +2512,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, */ return uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, - (port->uartclk + tolerance) / 16); + port->uartclk); } void -- 1.7.9.5