| Message ID | 1413983529-21887-2-git-send-email-eddie.huang@mediatek.com |
|---|---|
| State | Accepted |
| Commit | 2a768264eef098cc1355b02ca5023b6cfb183a1f |
| Headers | show
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[2001:1868:205::9]) by mx.google.com with ESMTPS id cc12si14145364pdb.189.2014.10.22.06.15.07 for <patch@linaro.org> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Oct 2014 06:15:07 -0700 (PDT) Received-SPF: none (google.com: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org does not designate permitted sender hosts) client-ip=2001:1868:205::9; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XgvjA-0001pT-To; Wed, 22 Oct 2014 13:13:24 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Xgvit-0001hS-W7 for linux-arm-kernel@lists.infradead.org; Wed, 22 Oct 2014 13:13:08 +0000 X-Listener-Flag: 11101 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw01.mediatek.com (envelope-from <eddie.huang@mediatek.com>) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1849655804; Wed, 22 Oct 2014 21:12:40 +0800 Received: from mtkslt208.mediatek.inc (10.21.15.95) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Wed, 22 Oct 2014 21:12:40 +0800 From: Eddie Huang <eddie.huang@mediatek.com> To: Rob Herring <robh+dt@kernel.org>, Matthias Brugger <matthias.bgg@gmail.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Subject: [PATCH 1/3] tty: serial: Fix mediatek UART driver setting baudrate issue Date: Wed, 22 Oct 2014 21:12:07 +0800 Message-ID: <1413983529-21887-2-git-send-email-eddie.huang@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1413983529-21887-1-git-send-email-eddie.huang@mediatek.com> References: <1413983529-21887-1-git-send-email-eddie.huang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141022_061308_335977_7E70C793 X-CRM114-Status: UNSURE ( 8.76 ) X-CRM114-Notice: Please train this message. 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diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 8f37d57..6f93123 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -74,14 +74,14 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, /* Set to next lower baudrate supported */ if ((baud == 500000) || (baud == 576000)) baud = 460800; - quot = DIV_ROUND_CLOSEST(port->uartclk, 4 * baud); + 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_CLOSEST(port->uartclk, 256 * baud); + quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } /*
In mtk8250_set_termios function, calculating quot value can not be zero, otherwise, using DIV_ROUND_CLOSEST(port->uartclk, quot * baud) will fail due to divisor is zero. Signed-off-by: Eddie Huang <eddie.huang@mediatek.com> --- drivers/tty/serial/8250/8250_mtk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)