linux-kernel - Re: [PATCH 1/3] spi: s3c64xx: added support for polling mode

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Message-ID: <20130423151511.GR5019@opensource.wolfsonmicro.com>
Date:	Tue, 23 Apr 2013 16:15:12 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Girish K S <girishks2000@...il.com>
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	grant.likely@...retlab.ca, t.figa@...sung.com
Subject: Re: [PATCH 1/3] spi: s3c64xx: added support for polling mode

On Mon, Apr 22, 2013 at 12:39:23PM +0530, Girish K S wrote:
> From: Girish K S <girishks2000@...il.com>
> 
> The 64xx spi driver supports partial polling mode.
> Only the last chunk of the transfer length is transferred
> or recieved in polling mode.

This appears to have a very noticable negative impact on SPI performance
on my S3C6410 based system.  Not delved into it to test why but are you
sure it's not mistakenly selecting polling?

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