From: Mark Brown <broonie@kernel.org>
To: Girish K S <girishks2000@gmail.com>
Cc: spi-devel-general@lists.sourceforge.net,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, grant.likely@secretlab.ca,
t.figa@samsung.com
Subject: Re: [PATCH 1/3] spi: s3c64xx: added support for polling mode
Date: Tue, 23 Apr 2013 16:15:12 +0100 [thread overview]
Message-ID: <20130423151511.GR5019@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <1366614565-3743-2-git-send-email-ks.giri@samsung.com>
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On Mon, Apr 22, 2013 at 12:39:23PM +0530, Girish K S wrote:
> From: Girish K S <girishks2000@gmail.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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From: broonie@kernel.org (Mark Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/3] spi: s3c64xx: added support for polling mode
Date: Tue, 23 Apr 2013 16:15:12 +0100 [thread overview]
Message-ID: <20130423151511.GR5019@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <1366614565-3743-2-git-send-email-ks.giri@samsung.com>
On Mon, Apr 22, 2013 at 12:39:23PM +0530, Girish K S wrote:
> From: Girish K S <girishks2000@gmail.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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next prev parent reply other threads:[~2013-04-23 15:15 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-22 7:09 [PATCH 0/3] Polling support for s3c64xx spi controller Girish K S
2013-04-22 7:09 ` Girish K S
[not found] ` <1366614565-3743-1-git-send-email-ks.giri-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-04-22 7:09 ` [PATCH 1/3] spi: s3c64xx: added support for polling mode Girish K S
2013-04-22 7:09 ` Girish K S
2013-04-22 7:09 ` Girish K S
2013-04-23 15:15 ` Mark Brown [this message]
2013-04-23 15:15 ` Mark Brown
[not found] ` <20130423151511.GR5019-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2013-04-24 9:37 ` Girish KS
2013-04-24 9:37 ` Girish KS
2013-04-24 9:37 ` Girish KS
2013-04-22 7:09 ` [PATCH 2/3] spi: s3c64xx: Added provision for dedicated cs pin Girish K S
2013-04-22 7:09 ` Girish K S
2013-04-22 7:09 ` Girish K S
2013-04-23 14:42 ` Mark Brown
2013-04-23 14:42 ` Mark Brown
[not found] ` <20130423144256.GP5019-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2013-04-24 9:39 ` Girish KS
2013-04-24 9:39 ` Girish KS
2013-04-24 9:39 ` Girish KS
2013-04-22 7:09 ` [PATCH 3/3] spi: s3c64xx: Added support for exynos5440 spi Girish K S
2013-04-22 7:09 ` Girish K S
2013-04-22 7:09 ` Girish K S
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