linux-kernel - Re: [PATCH] staging: ozwpan: High resolution timers

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Message-ID: <20130730131230.GC5002@mwanda>
Date:	Tue, 30 Jul 2013 16:12:30 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Rupesh Gujare <rupesh.gujare@...el.com>
Cc:	devel@...uxdriverproject.org, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: ozwpan: High resolution timers

On Tue, Jul 30, 2013 at 01:31:50PM +0100, Rupesh Gujare wrote:
> Current implementation assumes HZ = 1000 for calculating
> all internal timer intervals, which creates problem on
> platforms where HZ != 1000.
> 
> As well we need resolution of less than 10 mSec for heartbeat
> calculation, this creates problem on some platforms where HZ is
> configured as HZ = 100, or around, which restricts us to timer interval
> of 10 mSec. This is particularly found on embedded devices.
> 
> This patch moves on to use high resolution timers to calculate
> all timer intervals as it allows us to have very small resolution
> of timer interval, removing dependency on HZ.
>

I am new to this driver.  So we batch all the transfers together and
send/recieve them in oz_hcd_heartbeat() every 10msec?  It's a
polling interface?

Sorry, if I am completely mis-reading what this driver is doing.

In other words, could you explain what oz_hcd_heartbeat() does.

regards,
dan carpenter

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