From: "H. Peter Anvin" <hpa@zytor.com>
To: Vojtech Pavlik <vojtech@suse.cz>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Robert Hancock <hancockrwd@gmail.com>,
Bastien Nocera <hadess@hadess.net>,
linux-kernel <linux-kernel@vger.kernel.org>,
pjones@redhat.com
Subject: Re: [PATCH] Disable i8042 checks on Intel Apple Macs
Date: Mon, 25 Jan 2010 13:32:42 -0800 [thread overview]
Message-ID: <4B5E0DFA.8080705@zytor.com> (raw)
In-Reply-To: <20100125163433.GB31957@suse.cz>
On 01/25/2010 08:34 AM, Vojtech Pavlik wrote:
>
> Thus I believe that the right fix here is to figure out why the accesses
> to the ports 0x60/0x64 take a long time or forever on a Mac. Is it just
> that the kernel is timing out waiting for the i8042? Or is it something
> more sinister?
>
In the A20 code in the setup code, I look for 0xFF coming back and
terminate the "wait for ready" loop much sooner than for other values.
0xFF is a *possible* status value, but not a very *likely* one
(especially for repeated reads), as it would represent:
parity error + receive timeout + transmit timeout + keyboard lock +
command + selftest OK + input full + output full.
-hpa
next prev parent reply other threads:[~2010-01-25 21:33 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 18:23 [PATCH] Disable i8042 checks on Intel Apple Macs Bastien Nocera
2010-01-20 19:14 ` Justin P. Mattock
2010-01-20 19:37 ` Bastien Nocera
2010-01-20 19:54 ` Justin P. Mattock
2010-01-21 0:41 ` Robert Hancock
2010-01-21 1:31 ` Bastien Nocera
2010-01-21 2:19 ` Robert Hancock
2010-01-21 18:55 ` Dmitry Torokhov
2010-01-21 21:39 ` Robert Hancock
2010-01-21 21:42 ` Bastien Nocera
2010-01-21 21:49 ` Justin P. Mattock
2010-01-22 0:29 ` Robert Hancock
2010-01-22 1:20 ` Justin P. Mattock
2010-01-22 2:09 ` Bastien Nocera
2010-01-22 2:30 ` Robert Hancock
2010-01-22 2:53 ` Bastien Nocera
2010-01-22 2:31 ` Justin P. Mattock
2010-01-21 22:17 ` Dmitry Torokhov
2010-01-22 0:26 ` Robert Hancock
2010-01-22 17:46 ` H. Peter Anvin
2010-01-22 18:15 ` Bastien Nocera
2010-01-22 22:33 ` Robert Hancock
2010-01-22 22:49 ` H. Peter Anvin
2010-01-25 16:34 ` Vojtech Pavlik
2010-01-25 21:32 ` H. Peter Anvin [this message]
2010-01-25 22:15 ` Dmitry Torokhov
2010-01-25 22:18 ` H. Peter Anvin
2010-01-25 22:30 ` Dmitry Torokhov
2010-01-25 23:05 ` H. Peter Anvin
2010-01-25 23:28 ` Dmitry Torokhov
2010-01-25 23:31 ` H. Peter Anvin
2010-05-04 17:06 ` Bastien Nocera
2010-05-04 17:23 ` Dmitry Torokhov
2010-05-04 17:37 ` Bastien Nocera
-- strict thread matches above, loose matches on Subject: below --
2010-05-04 17:36 Bastien Nocera
2010-05-04 17:55 ` Pekka Enberg
2010-05-04 18:02 ` Dmitry Torokhov
2010-05-05 9:18 ` Bastien Nocera
2010-05-05 21:27 ` Kyle McMartin
2010-05-12 0:11 Bastien Nocera
2010-05-12 10:51 ` Felipe Contreras
2010-05-12 11:00 ` Felipe Contreras
2010-05-12 17:51 ` Dmitry Torokhov
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