linux-kernel - Re: [PATCH v2] mtd: pxa3xx-nand: handle PIO in threaded interrupt

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Message-ID: <20150228091552.GA12966@brian-ubuntu>
Date:	Sat, 28 Feb 2015 01:15:52 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: pxa3xx-nand: handle PIO in threaded interrupt

On Fri, Feb 20, 2015 at 07:36:43PM +0100, Robert Jarzmik wrote:
> Change the handling of the data stage in the driver : don't pump data in
> the top-half interrupt, but rather schedule a thread for non dma cases.
> 
> This will enable latencies in the data pumping, especially if delays are
> required. Moreover platform shall be more reactive as other interrupts
> can be served while pumping data.
> 
> No throughput degradation was observed, at least on the zylonite
> platform, while a slight degradation was being expected.
> 
> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> Tested-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
> Since v1: use IRQF_ONESHOT per Maxime's comment

Pushed to l2-mtd.git. Thanks.

Brian
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