linux-kernel - Re: [PATCHv3 2/3] drivers: spi: Add qspi flash controller

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Message-ID: <20130709145321.GA1680@kahuna>
Date:	Tue, 9 Jul 2013 09:53:21 -0500
From:	Nishanth Menon <nm@...com>
To:	Mark Brown <broonie@...nel.org>
CC:	<balbi@...com>, Sourav Poddar <sourav.poddar@...com>,
	<spi-devel-general@...ts.sourceforge.net>,
	<grant.likely@...aro.org>, <rnayak@...com>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 2/3] drivers: spi: Add qspi flash controller

On 15:40-20130709, Mark Brown wrote:
> On Tue, Jul 09, 2013 at 07:50:55AM -0500, Nishanth Menon wrote:
> 
> > with this input and looking closer, I think I see what you are saying now:
> > dra7xxx_qspi_prepare_xfer -> does a pm_runtime_get_sync
> > dra7xxx_qspi_unprepare_xfer -> does a pm_runtime_mark_last_busy,
> > pm_runtime_put_autosuspend
> 
> > In between these calls, you have the remaining xfer calls going on.
> > we are assuming here that autosuspend timeout should be greater than
> > the time to complete the worst case transfer.
> 
> No, autosuspend will do nothing so long as there are references to the
> device held.  The effect of autosuspend is to delay power down after the
> last reference has been dropped, otherwise things run normally.

Thanks on the clarification. That concludes my confusion on the topic
:).

-- 
Regards,
Nishanth Menon
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