From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Hurley Subject: Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Date: Wed, 17 Sep 2014 08:20:41 -0400 Message-ID: <54197C99.8030601@hurleysoftware.com> References: <1410377411-26656-1-git-send-email-bigeasy@linutronix.de> <1410377411-26656-10-git-send-email-bigeasy@linutronix.de> <20140911111721.GB17476@xps8300> <54118AAB.2010205@linutronix.de> <5411967A.6090406@hurleysoftware.com> <54119AAA.9080907@linutronix.de> <5411B33F.10405@hurleysoftware.com> <54171B85.5060209@linutronix.de> <54186B89.8050505@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <54186B89.8050505@linutronix.de> Sender: linux-kernel-owner@vger.kernel.org To: Sebastian Andrzej Siewior Cc: Heikki Krogerus , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tony@atomide.com, balbi@ti.com, gregkh@linuxfoundation.org, Alan Cox List-Id: linux-serial@vger.kernel.org On 09/16/2014 12:55 PM, Sebastian Andrzej Siewior wrote: > On 09/15/2014 07:01 PM, Sebastian Andrzej Siewior wrote: >> On 09/11/2014 04:35 PM, Peter Hurley wrote: >>> I do need to find out if omap hardware sets UART_MSR_DCTS when auto= CTS >>> is on. Would you mind running the debug patch below with HW flow co= ntrol on? >> >> I didn't forget about this. However I told minicom to use hardware f= low >> control (and I see the driver set the HW bit) but I haven't seen tha= t >> uart_handle_cts_change() has been invoked at all. I'm going to check >> two other boards and report then. >=20 > No, I don't get into this at all function. Ok, good to know. Thanks for testing that. > So I connected my am335x-evm > with beagle board xm because both of them have an old fashion UART > connector (instead those uart-to-usb). Both configured with HW-Flow a= nd > I haven't seen the function invoked but I saw "port->icount.overrun" > being incremented. This shouldn't happen. So I am a little puzzled he= re=E2=80=A6 Yeah, that's weird. Do you have a break-out box to confirm that RTS/CTS= are being driven? Regards, Peter Hurley