linux-kernel - Re: [PATCH] dmaengine: at_hdmac: pause: no need to wait for FIFO empty

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Date:	Tue, 10 May 2011 15:56:15 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: at_hdmac: pause: no need to wait for FIFO
 empty

Hello.

On 09-05-2011 20:11, Nicolas Ferre wrote:

> The addition of the pause feature to atc_control an active wait was introduced
> to check the FIFO empty event.

    Couldn't parse this -- did you forget "with"at the start of the statement?

> This event was not always happening and
> a timout contition was needed.
> But, in some cases, this event depend on the peripheral connected to the
> channel that is paused: FIFO becomes empty if the peripheral consumes data.
> The timeout is pretty difficult to evaluate. Moreover, this check is not
> needed.
> In conclusion, it seems sensible to entirely remove the checking of
> "FIFO empty" status when pausing.

> Signed-off-by: Nicolas Ferre<nicolas.ferre@...el.com>

WBR, Sergei
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