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Date: Mon, 14 Feb 2011 01:57:39 -0800
Message-ID: <AANLkTinpP6hoy_cz7qb1+izjO6_LEeQDfVfVwB-QrRiu@mail.gmail.com>
Subject: Re: [PATCH 2/2 v2] dma: ipu_idmac: do not lose valid received data in
 the irq handler
From: Dan Williams <dan.j.williams@intel.com>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Anatolij Gustschin <agust@denx.de>,
	Markus Niebel <Markus.Niebel@tqs.de>,
	Detlev Zundel <dzu@denx.de>,
	linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org,
	"Koul, Vinod" <vinod.koul@intel.com>
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On Mon, Feb 7, 2011 at 8:49 AM, Guennadi Liakhovetski
<g.liakhovetski@gmx.de> wrote:
> Ok, I've found the reason. Buffer number repeats, when there is an
> underrun, which is happening in my tests, when frames are arriving quickly
> enough, but the user-space is not fast enough to process them, e.g., when
> it is writing them to files over NFS or even just displaying on the LCD.
> Without your patch these underruns happen just as well, they just don't
> get recognised, because there's always one buffer delayed, so, the queue
> is never empty.
>
> Dan, please add my
>
> Reviewed-(and-tested-)by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Thanks, applied v2.

--
Dan

From mboxrd@z Thu Jan  1 00:00:00 1970
From: dan.j.williams@intel.com (Dan Williams)
Date: Mon, 14 Feb 2011 01:57:39 -0800
Subject: [PATCH 2/2 v2] dma: ipu_idmac: do not lose valid received data in
	the irq handler
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To: linux-arm-kernel@lists.infradead.org
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On Mon, Feb 7, 2011 at 8:49 AM, Guennadi Liakhovetski
<g.liakhovetski@gmx.de> wrote:
> Ok, I've found the reason. Buffer number repeats, when there is an
> underrun, which is happening in my tests, when frames are arriving quickly
> enough, but the user-space is not fast enough to process them, e.g., when
> it is writing them to files over NFS or even just displaying on the LCD.
> Without your patch these underruns happen just as well, they just don't
> get recognised, because there's always one buffer delayed, so, the queue
> is never empty.
>
> Dan, please add my
>
> Reviewed-(and-tested-)by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Thanks, applied v2.

--
Dan