Re: DMA conflicts with soundcard for ide driver via82cxxx

[Vojtech Pavlik <vojtech@suse.cz>]

On Fri, Dec 28, 2001 at 05:10:43PM +0100, Edward Stempel wrote:

> Excellent! That solved my problem.

What exactly did you have to change? It might be worth to include the
changing of the latency setting in the kernel.

> 
> Thankx
> 
> Edward
> 
> 
> 
> 
> Date: Fri, 28 Dec 2001 10:15:05 +0100
> From: Vojtech Pavlik <vojtech@suse.cz>
> To: Edward Stempel <eazstempel@cal009001.student.utwente.nl>
> Cc: linux-kernel mailinglist <linux-kernel@vger.kernel.org>
> Subject: Re: DMA conflicts with soundcard for ide driver via82cxxx
> 
> On Fri, Dec 28, 2001 at 03:32:34AM +0100, Edward Stempel wrote:
> 
> > I have an Asus a7v266 mother board and an Ensoniq sound card in it. 
> > The ide chipset is a VIA VT8233 that is capable of UDMA100. So I built a
> > kernel with the es1371 sound driver and the via82cxxx ide driver
> > configured in it. Actually I tried the kernel 2.4.17 first, and the latest
> > I tried is 4.5.1 with the latest patch (patch-2.5.2-pre3) applied to it.
> > I also tried the kernel 2.5.1 with Vojtech  patch (via-3.33.diff from
> > his email dated 2001-12-23 23:20:48) applied to it, with the same
> > (negative) results.
> > 
> > The good thing is that hdparm reports appr. 40 MB/sec when using DMA and
> > about 6 MB/sec when not using DMA.
> > Unfortunately using DMA for ide results in some ugly distortion of the
> > sound from my soundcard whenever some IO to the disk is done.  :((
> > 
> > I have assigned different interrupts to the PCI-cards (ide is 
> > on-board) and I even changed the sound card's PCI slot, so it shared
> > its interrupt with another device (acpi instead of USB). It did not solve
> > the problem. Because the problem only occurs when switching on using_dma
> > on the ide driver, I think it is a DMA problem with the ide driver. It may
> > be the es1371 driver as well off course, but I suspect it is the ide
> > driver (or chipset).
> >   
> > Reading the list archive from linux-kernel, I discovered there have been
> > more problems with DMA using this chipset, but I did not find anyone
> > having the same problem as I have now.
> > 
> > Has someone also dealt with these problems, or can someone help me
> > solving this problem? Please help!  
> > 
> > Below are some outputs using kernel 5.1 with patch-2.5.2-pre3.
> 
> You may try changing the PCI latency settings on either the IDE
> controller or the sound card. Other than that, I don't know how to help.
> 
> -- 
> Vojtech Pavlik
> SuSE Labs

-- 
Vojtech Pavlik
SuSE Labs