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Date: Thu, 17 Jul 2014 11:31:59 -0400 From: Peter Hurley <peter@...leysoftware.com> To: balbi@...com, Sebastian Andrzej Siewior <bigeasy@...utronix.de> CC: linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, mika.westerberg@...ux.intel.com Subject: Re: [PATCH 4/5] tty: serial: 8250 core: add runtime pm On 07/16/2014 12:06 PM, Felipe Balbi wrote: > On Wed, Jul 16, 2014 at 05:54:56PM +0200, Sebastian Andrzej Siewior wrote: >> On 07/16/2014 05:16 PM, Felipe Balbi wrote: >>> I wonder if you should get_sync() on start_tx() and only >>> put_autosuspend() at stop_tx(). I guess the outcome would be >>> largely the same, no ? >> >> I just opened minicom on ttyS0 and gave a try. start_tx() was invoked >> each time I pressed a key (sent a character). I haven't seen stop_tx() >> even after after I closed minicom. I guess stop_tx() is invoked if you >> switch half-duplex communication. > > that's bad, I expected stop to be called also after each character. The 8250 core auto-stops tx when the tx ring buffer is empty (except in the case of dma, where stopping tx isn't necessary). Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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