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From: Pierre Ossman <drzeus-list@drzeus.cx>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: ISA DMA controller hangs
Date: Sun, 05 Jun 2005 16:03:08 +0200	[thread overview]
Message-ID: <42A3061C.7010604@drzeus.cx> (raw)
In-Reply-To: <42A2B610.1020408@drzeus.cx>

Pierre Ossman wrote:
> 
> I added some debug output to the driver, dumping the DMA controller's
> registers before and after suspend and it seems it goes completely
> apeshit. The registers are filled with, what it seems, random data. The
> reason it stops working seems to be that channel 4 gets disabled killing
> the cascaded channels. I'm going to try and confirm this today.
> 

Confirmed. By explicitly reenabling DMA channel 4 in the driver on
resumt the DMA transfers work fine.

  reply	other threads:[~2005-06-05 14:03 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-28 13:38 ISA DMA controller hangs Pierre Ossman
2005-05-28 13:51 ` Alan Cox
2005-06-05  8:21   ` Pierre Ossman
2005-06-05 14:03     ` Pierre Ossman [this message]
2005-06-16 15:53       ` Pierre Ossman
2005-06-16 16:06         ` Russell King
2005-06-18  8:15           ` Pierre Ossman
2005-06-19 15:45             ` Russell King
2005-06-30  8:00           ` Pierre Ossman
2005-06-30 11:28             ` Alan Cox
2005-06-30 12:20               ` Pierre Ossman
2005-06-30 17:55                 ` [PATCH 1/2] ISA DMA suspend for i386 Pierre Ossman
2005-06-30 17:58                 ` [PATCH 2/2] ISA DMA suspend for x86_64 Pierre Ossman

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