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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4CE6BC6FD20 for ; Fri, 24 Mar 2023 11:49:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID: In-Reply-To:Subject:cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dQell4pFIWiYU7MuYSFNjRTxeMMNe5vYPuIcfSZWRxo=; b=q0P73j3IeKQgNY fowp3l+tWiw6rwi7bKGm2jcbOhF2X+fPJ5hMfVEw92+EJryBOlcgWuORBGcDNvaWCcXpJ3g7EM2VZ 0MtmpDH4Rh+g8oSROvnBcv2LVFdHbwuK4oIzg+4r8tn5mejNnqCZU49Bg5nHXVIpJqK+hJZsr37zo fVy7XDSd0xoOBhfgo2I+vbKWLN2LQrzAC0hGZPGAnHxAYoT0tQFstT7o2eQMYKWt4k8sXigaJqpdE xZLnWabXL+pRhC1QMdjCUqN2Jzit3xxBMTNF1H0ygH6TTuj/YklTA9VXxf34BGjNnAqMV2+WdXYgx RpSNOyO/Wg4/QIfk2vQA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pfftx-004HTy-0N; Fri, 24 Mar 2023 11:48:09 +0000 Received: from mga11.intel.com ([192.55.52.93]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pfftu-004HTZ-16 for linux-arm-kernel@lists.infradead.org; Fri, 24 Mar 2023 11:48:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679658486; x=1711194486; h=date:from:to:cc:subject:in-reply-to:message-id: references:mime-version; bh=CXJq/GBiCyHzHxgLHwLLnYEQRI4JydW13S9/NiBPtZA=; b=IP/h2cAY0XIDVXFVkGOTK3EL2zBi/y7P6YD5EFnJAQAQXc9QBif2ST4s 6XBhEhpp3ZD47huo3UyrMMuyRrpMlhwG/1P4BD44atPL+9uSaAQmycskL +uTCBlJe2krVi6DiZwfifU2rbRP62rKcK4kFkwtEgwIvPe/PgnaV+86mO KTXHHaIBpz2OtOEeb8KavBvAb6g4+6ycP/uEpJdmbUPsn0xjsQybX4s+/ eb2099uFMBBUH9k7rD6MXPxxZ/3+x2Jbc/jIqnyXMXhPy8Q6d9xkBFldi Sl4KGeUbSp7XksrZuDad3tsUKnb7GfGniaJHbleR6ekHl8zaaAEBfBT2Q w==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="337263291" X-IronPort-AV: E=Sophos;i="5.98,287,1673942400"; d="scan'208";a="337263291" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2023 04:48:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="806648995" X-IronPort-AV: E=Sophos;i="5.98,287,1673942400"; d="scan'208";a="806648995" Received: from dmendyk-mobl2.ger.corp.intel.com ([10.252.38.125]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2023 04:48:01 -0700 Date: Fri, 24 Mar 2023 13:47:59 +0200 (EET) From: =?ISO-8859-15?Q?Ilpo_J=E4rvinen?= To: Stefan Wahren cc: =?ISO-8859-2?Q?Tomasz_Mo=F1?= , Greg Kroah-Hartman , Jiri Slaby , =?ISO-8859-15?Q?Uwe_Kleine-K=F6nig?= , Sergey Organov , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , linux-serial@vger.kernel.org, Linux ARM , Shawn Guo , Stefan Wahren Subject: Re: Regression: serial: imx: overrun errors on debug UART In-Reply-To: <2c29454b-9369-4360-8eb4-c151f59460cb@i2se.com> Message-ID: References: <2c29454b-9369-4360-8eb4-c151f59460cb@i2se.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230324_044806_392299_43C3CDC9 X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 24 Mar 2023, Stefan Wahren wrote: > Hi, > > after switching to Linux 6.1.21 on our Tarragon board (i.MX6ULL SoC), we > experience the following issues with the debug UART (115200 baud, 8N1, no > hardware flow control): > > - overrun errors if we paste in multiple text lines while system is idle > - no reaction to single key strokes while system is on higher load > > After reverting 7a637784d517 ("serial: imx: reduce RX interrupt frequency") > the issue disappear. > > Maybe it's worth to mention that the Tarragon board uses two additional > application UARTs with similiar baud rates (9600 - 115200 baud, no hardware > flow control) for RS485 communication, but there are no overrun errors (with > and without the mention change). This has come up earlier, see e.g.: https://lore.kernel.org/linux-serial/20221003110850.GA28338@francesco-nb.int.toradex.com/ My somewhat uninformed suggestion: if the overrun problems mostly show up with console ports, maybe the trigger level could depend on the port being a console or not? -- i. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel