linux-kernel - Re: [PATCH v3 1/3] net: irda: pxaficp_ir: use sched

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Message-Id: <20150928.223310.709463014669733152.davem@davemloft.net>
Date:	Mon, 28 Sep 2015 22:33:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	robert.jarzmik@...e.fr
Cc:	samuel@...tiz.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] net: irda: pxaficp_ir: use sched_clock() for
 time management

From: Robert Jarzmik <robert.jarzmik@...e.fr>
Date: Sat, 26 Sep 2015 20:49:18 +0200

> Instead of using directly the OS timer through direct register access,
> use the standard sched_clock(), which will end up in OSCR reading
> anyway.
> 
> This is a first step for direct access register removal and machine
> specific code removal from this driver.
> 
> This commit changes the behavior, as previously the minimum turnaround
> time was counted in 76ns steps, while with this patch it is counted in
> microsecond steps. The strictly equal formula would have been :
> 	    while ((sched_clock() - si->last_clk) * 76 < mtt)
> 
> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> ---
> Since v2: fixed clock calculation as pointed out by David

Applied to net-next.
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