From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81CDFC43381 for ; Mon, 18 Feb 2019 14:02:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 47C3B21905 for ; Mon, 18 Feb 2019 14:02:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498539; bh=JLbJ73SGnxO0EnhKF2/7NK3ppavo3KHOUrtNfmmHnAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lWI1RVJTx2Feg2UYZCM9jvyiKTN/LIYGljyrSGLeMV33gLt7Gr/TgC1eTuqtQlpLP /0Re9PJkiNk8RtRkE0C0Zk9UtlveCBbnzZBNehsslEc3WolwGq567BqS7Y5xKlOmow jQMome6WsAgzIvlGOuePH15HKo0laAQUdq4smgWo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388702AbfBROCR (ORCPT ); Mon, 18 Feb 2019 09:02:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:43820 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388374AbfBROCO (ORCPT ); Mon, 18 Feb 2019 09:02:14 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B6F6E2070D; Mon, 18 Feb 2019 14:02:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498534; bh=JLbJ73SGnxO0EnhKF2/7NK3ppavo3KHOUrtNfmmHnAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=topoiZX9T1FVPmvHbWkWb2EPFaqjKXFIEl10hQmJ39+jtrjIL6kX0Y3kC5SHTA+3T ChqJwSyobeWj6axTA+AJD/0ooTxUcKPUWz8aAWr8wmsUcs6aAmRKfVQle1Oppjkhbc qfVctrVYqqxsNIYN36Iki78y69I/rHnNEimCIe/4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Beomho Seo , Marek Szyprowski , Sasha Levin Subject: [PATCH 4.4 039/143] tty: serial: samsung: Properly set flags in autoCTS mode Date: Mon, 18 Feb 2019 14:42:47 +0100 Message-Id: <20190218133530.580341061@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133529.099444112@linuxfoundation.org> References: <20190218133529.099444112@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 31e933645742ee6719d37573a27cce0761dcf92b ] Commit 391f93f2ec9f ("serial: core: Rework hw-assited flow control support") has changed the way the autoCTS mode is handled. According to that change, serial drivers which enable H/W autoCTS mode must set UPSTAT_AUTOCTS to prevent the serial core from inadvertently disabling TX. This patch adds proper handling of UPSTAT_AUTOCTS flag. Signed-off-by: Beomho Seo [mszyprow: rephrased commit message] Signed-off-by: Marek Szyprowski Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/samsung.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 4d532a085db9..12bac2cbae4b 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1329,11 +1329,14 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, wr_regl(port, S3C2410_ULCON, ulcon); wr_regl(port, S3C2410_UBRDIV, quot); + port->status &= ~UPSTAT_AUTOCTS; + umcon = rd_regl(port, S3C2410_UMCON); if (termios->c_cflag & CRTSCTS) { umcon |= S3C2410_UMCOM_AFC; /* Disable RTS when RX FIFO contains 63 bytes */ umcon &= ~S3C2412_UMCON_AFC_8; + port->status = UPSTAT_AUTOCTS; } else { umcon &= ~S3C2410_UMCOM_AFC; } -- 2.19.1