From patchwork Fri Aug 12 02:41:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Cheng X-Patchwork-Id: 9276197 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E2C6F6022E for ; Fri, 12 Aug 2016 02:42:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D414528806 for ; Fri, 12 Aug 2016 02:42:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C870728809; Fri, 12 Aug 2016 02:42:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 55EDC28806 for ; Fri, 12 Aug 2016 02:42:03 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bY2Q5-0007Ou-5n; Fri, 12 Aug 2016 02:42:01 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bY2Q2-0007Na-0j; Fri, 12 Aug 2016 02:41:59 +0000 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 2102194455; Fri, 12 Aug 2016 10:41:30 +0800 Received: from mhfsdcap03.localdomain (10.17.3.153) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Fri, 12 Aug 2016 10:41:28 +0800 From: Long Cheng To: Greg Kroah-Hartman , Jiri Slaby , Matthias Brugger 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 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160811_194158_219083_B257DDC9 X-CRM114-Status: GOOD ( 11.48 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Hurley , srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org, Long Cheng , linux-mediatek@lists.infradead.org, linux-serial@vger.kernel.org, Eddie Huang , linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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