From patchwork Fri Sep 11 15:00:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 11771005 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 67953746 for ; Fri, 11 Sep 2020 17:08:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46BEB22207 for ; Fri, 11 Sep 2020 17:08:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="IpnVtLgd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726171AbgIKRIB (ORCPT ); Fri, 11 Sep 2020 13:08:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726284AbgIKPCE (ORCPT ); Fri, 11 Sep 2020 11:02:04 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 36351C061364 for ; Fri, 11 Sep 2020 08:01:26 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id x123so7548778pfc.7 for ; Fri, 11 Sep 2020 08:01:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=AFJYLvWtKd0gWhl3s1dZJrARfNTei6xcNX2ZyXTTyO0=; b=IpnVtLgdVGxhyuhCaS3cPthT9iWbMsqXgb/fu9cWcyRQ9WBj7UKn73b4/hSmaDNGdT vbToscSU7CgC3GpktUaHD1tHLwWiHiumDKkD1k3t6SGJNRVP5UsQYkKbEqb1wCTOYpTj Sv++5PX7M5QblxUKx6v415lGt6T8zSYIy8yNA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=AFJYLvWtKd0gWhl3s1dZJrARfNTei6xcNX2ZyXTTyO0=; b=pGiCEFD+OGBsC3eOBTC3oXy1Fcmmrb/XaO2RK4b/4EsFbQ6q0jSoNqu36M/JWkRuV0 CAv43sM9jxHoWL+doOm9Pd4z5E2EoQWuyp8wG2CxBmyJLS2dETg9foNKtE6lmcSNsuSi SqunuV4TaHjPLg1LgRgOgBeqyEfDMAXHfxGHMVYbmO+nggpo0NObhVezal7RRwm4lucf qK8ivPgdNiDG8MhEEVR1SCbP9vLRc2rLbWfa5WxjWREefu9a8v+eR/xSWG1xpjNEQTQV 6HwbDc5Ntm1/NWAqXet5FfuvzKUNjNOui1awjcRVF6GQkK6b28w2wpgVICfANOsgE9EY 3zGw== X-Gm-Message-State: AOAM530V8L9e7iLPA1PU0rUKZYOHeDGUytsFIB3Dh0/wi+kh1VIKlM4s uvLOBhu/V2SE9uO9PLVnHlLD1A== X-Google-Smtp-Source: ABdhPJxR0SrJk8qEMtS/78b14//HJcWkWdb22wVtMM6VdsZAhtXPxe9ZkJhbyfNjy2GKsy5A3IFXxw== X-Received: by 2002:a17:902:123:: with SMTP id 32mr2248956plb.143.1599836486326; Fri, 11 Sep 2020 08:01:26 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:42b0:34ff:fe3d:58e6]) by smtp.gmail.com with ESMTPSA id v91sm2657228pjv.12.2020.09.11.08.01.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 08:01:25 -0700 (PDT) From: Douglas Anderson To: Greg Kroah-Hartman Cc: Nick Desaulniers , robdclark@chromium.org, Akash Asthana , Nathan Chancellor , jwerner@chromium.org, Douglas Anderson , Andy Gross , Bjorn Andersson , Jiri Slaby , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Subject: [PATCH] tty: serial: qcom_geni_serial: 115.2 is a better console default than 9600 Date: Fri, 11 Sep 2020 08:00:57 -0700 Message-Id: <20200911080054.1.I4c00b921c2f17b6988688046fa7be0f729f8d591@changeid> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Commit c5cbc78acf69 ("tty: serial: qcom_geni_serial: Initialize baud in qcom_geni_console_setup") fixed a bug by initting a variable that was used in some cases without initialization. However, the "default" baud rate picked by that CL was probably not the best choice. The chances that anyone out there is trying to run a system with kernel messages piped out over a 9600 baud serial port is just about nil. Console messages are printed in a blocking manner. At 9600 baud we print about 1 character per millisecond which means that printing a 40-byte message to the console will take ~40 ms. While it would probably work, it's going to make boot _very_ slow and probably cause the occasional timeout here and there in drivers (heck, even at 115200 console delays can wreck havoc). This has already bit at least two people that I'm aware of that tried to enable serial console by just adding "console=ttyMSM0" (instead of "console=ttyMSM0,115200n8") to the command line, so it seems like it'd be nice to fix. Let's switch the default to 115200. Signed-off-by: Douglas Anderson Reviewed-by: Akash Asthana Reviewed-by: Bjorn Andersson --- drivers/tty/serial/qcom_geni_serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index f0b1b47c3abc..e390ffc8bbbd 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -1107,7 +1107,7 @@ static int qcom_geni_console_setup(struct console *co, char *options) { struct uart_port *uport; struct qcom_geni_serial_port *port; - int baud = 9600; + int baud = 115200; int bits = 8; int parity = 'n'; int flow = 'n';