From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753735AbaIXH47 (ORCPT ); Wed, 24 Sep 2014 03:56:59 -0400 Received: from www.linutronix.de ([62.245.132.108]:52016 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752806AbaIXH45 (ORCPT ); Wed, 24 Sep 2014 03:56:57 -0400 Date: Wed, 24 Sep 2014 09:56:51 +0200 From: Sebastian Andrzej Siewior To: Frans Klaver Cc: Heikki Krogerus , Peter Hurley , tony@atomide.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, balbi@ti.com, linux-serial@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alan Cox Subject: Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Message-ID: <20140924075651.GC19565@linutronix.de> References: <5411C810.7070906@linutronix.de> <2cf997d9-e7de-465b-915d-3a0a5e7b95f7@email.android.com> <54129F6C.7040508@linutronix.de> <20140912094010.GE28458@ci00147.xsens-tech.local> <5412C21A.8020203@linutronix.de> <20140912102816.GF28458@ci00147.xsens-tech.local> <541716DC.9020904@linutronix.de> <20140917102812.GA20438@ci00147.xsens-tech.local> <20140921204100.GA10111@linutronix.de> <20140922092853.GH20438@ci00147.xsens-tech.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20140922092853.GH20438@ci00147.xsens-tech.local> X-Key-Id: 97C4700B X-Key-Fingerprint: 09E2 D1F3 9A3A FF13 C3D3 961C 0688 1C1E 97C4 700B User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Frans Klaver | 2014-09-22 11:28:54 [+0200]: > >Wow, thanks for your work here. This does indeed sound hard to trap. > >I guess then we'd still have to answer the question why the yocto build >calls set_termios() so often, but that's not on you then. Did you notice >it even changing settings? We might want to fix this even if the kernel >should be able to cope. Yeah. I don't care if this is yocto's fault or not. If it is possible to stop the DMA transfer from userland with whatever method then it needs to be fixed in kernel so that this does happen. >Thanks again, >Frans Sebastian