linux-kernel - Re: [RFC PATCH v3 11/16] mmc: omap_hsmmc: limit max

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Date:	Thu, 10 Jan 2013 14:30:28 -0500
From:	Matt Porter <mporter@...com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Benoit Cousson <b-cousson@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Dan Williams <djbw@...com>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Chris Ball <cjb@...top.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 11/16] mmc: omap_hsmmc: limit max_segs with the
 EDMA DMAC

On Mon, Oct 29, 2012 at 01:48:46PM +0530, Sekhar Nori wrote:
> On 10/18/2012 6:56 PM, Matt Porter wrote:
> > The EDMA DMAC has a hardware limitation that prevents supporting
> > scatter gather lists with any number of segments. Since the EDMA
> > DMA Engine driver sets the maximum segments to 16, we do the
> > same.
> > 
> > TODO: this will be replaced once the DMA Engine API supports an
> > API to query the DMAC's segment size limit.
> > 
> > Signed-off-by: Matt Porter <mporter@...com>
> > ---
> >  drivers/mmc/host/omap_hsmmc.c |   10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> > index b327cd0..52bab01 100644
> > --- a/drivers/mmc/host/omap_hsmmc.c
> > +++ b/drivers/mmc/host/omap_hsmmc.c
> > @@ -1828,6 +1828,16 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
> >  	 * as we want. */
> >  	mmc->max_segs = 1024;
> >  
> > +	/* Eventually we should get our max_segs limitation for EDMA by
> > +	 * querying the dmaengine API */
> 
> Nit picking: This is not as per multi-line comment style in
> Documentation/CodingStyle.

Thanks :). This is dropped from v4 anyway, as I now use a call to
dma_get_channel_caps() to determine the SG limits.

-Matt
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