linux-kernel - Re: [PATCH] ata: hpt366: fix incorrect mask when checking at cmd_high

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Date:	Mon, 18 Jul 2016 21:14:41 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Colin King <colin.king@...onical.com>
Cc:	kernel-tram@...ts.ubuntu.com,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: hpt366: fix incorrect mask when checking at
 cmd_high_time

On Tue, 12 Jul 2016 12:16:19 +0100
Colin King <colin.king@...onical.com> wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> According to the HPT366 data sheet, PCI config space dword 0x40-0x43
> bits 11:8 specify the primary drive cmd_high_time, however,
> currently just 3 bits of the 4 are being used because the mask
> is 0x700 and not 0x0f00.  Fix the mask, allowing for the 40MHz clock
> to be detected.

Is this tested on real hardware ? I learned long ago never to blindly
trust IDE data sheets. It looks right but if anyone actually has a 40MHz
PCI bus box with an HPT366 it would be good to test.

Alan