From mboxrd@z Thu Jan 1 00:00:00 1970 From: frans.klaver@xsens.com (Frans Klaver) Date: Mon, 29 Sep 2014 10:50:42 +0200 Subject: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx In-Reply-To: <20140925151403.GH19396@linutronix.de> References: <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> <20140925151403.GH19396@linutronix.de> Message-ID: <20140929085042.GA13952@ci00147.xsens-tech.local> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Sep 25, 2014 at 05:14:03PM +0200, Sebastian Andrzej Siewior wrote: > * Frans Klaver | 2014-09-22 11:28:54 [+0200]: > > >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. > > could you please test uart_v10_pre3? I dropped a few register sets and > delayed the register update until TX-DMA is complete. I am traveling > currently and have only my boneblack and it passes my limited testing. > If it solves your problems, too then I would address Heikki's latest > comments and prepare the final v10 (and I hope I didn't break beagle > board in between). This version fixes the console things for us. It also increases the amount of data we can push over the serial port. If I push the data towards our requirements, we're not there yet. I get the "too much work for irq" notice still. However, I don't think you'd need to be fixing that in this series (or at all). We had similar issues there with omap-serial as well. As far as I'm concerned, this is Tested-by: Frans Klaver Thanks, Frans