linux-kernel - Re: Discussion: quick_pit

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Message-ID: <20150610085535.4750.qmail@ns.horizon.com>
Date:	10 Jun 2015 04:55:35 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	adrian.hunter@...el.com, linux@...izon.com
Cc:	ak@...ux.intel.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	luto@...capital.net, mingo@...nel.org, tglx@...utronix.de,
	torvalds@...ux-foundation.org
Subject: Re: Discussion: quick_pit_calibrate is slow

Adrian Hunter wrote:
> On 10/06/15 10:08, George Spelvin wrote:
>> The 8254 timer latches the msbyte when the lsbyte is read
>> and returns the latched value on the next read

> Are you sure about? The docs I've read don't seem to say that.

You're right; I musy have been thinking about the write side which does
this, or some other hardware.  Anyway, the counter latch command exists
and can be used for the purpose.

So the idea still works.
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