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

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Message-ID: <508E3BE6.3070609@ti.com>
Date:	Mon, 29 Oct 2012 13:48:46 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Matt Porter <mporter@...com>
CC:	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Arnd Bergmann <arnd@...db.de>, Dan Williams <djbw@...com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [RFC PATCH v3 11/16] mmc: omap_hsmmc: limit max_segs with the
 EDMA DMAC

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,
Sekhar
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