Message-ID: <3A82D271.6010000@valinux.com>
Date: Thu, 08 Feb 2001 10:08:01 -0700
From: Jeff Hartmann <jhartmann@valinux.com>
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To: Alex Deucher <adeucher@UU.NET>
CC: vandrove@vc.cvut.cz, linux-kernel@vger.kernel.org
Subject: Re: 2.4.x, drm, g400 and pci_set_master
In-Reply-To: <3A82CBCE.6926AFAF@uu.net>
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Sender: linux-kernel-owner@vger.kernel.org

Alex Deucher wrote:

> I'm not sure about the mga source, but you can enable busmaster manually
> as root.  See the dri-devel list for more.  I can't remember the exact
> message off hand.  THere was also some discussion of this last week I
> think.
> 
> Alex
> 
> 
> ----------------------------
> 
> Hi, 
>   friend of mine bought g400 on my recommendation, and unfortunately, 
> mga drm driver did not worked for me. I tracked it down to missing 
> pci_enable_device and pci_set_master in mga* driver. But even after 
> looking more than hour into that code I have no idea where I should 
> place this call, as it looks like that mga driver is completely 
> shielded from seeing pcidev structure :-( 
>   Does anybody know where I should place pci_enable_device and 
> pci_set_master into mga code? I worked around pci_enable_device by 
> using matroxfb, but pci_set_master is not invoked by matroxfb, and 
> adding this call into matroxfb just to get mga drm driver to work does 
> not look correctly to me - although it is what I had done just now. 
>                                     Thanks, 
>                                             Petr Vandrovec 
>                                             vandrove@vc.cvut.cz
> -
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> 

The DRM drivers don't know about the pcidev structure at all.  All this 
is done in the XFree86 ddx driver.  You can probably add something like 
this to MGAPreInit (after pMga->PciTag is set, in my copy its 
mga_driver.c:1232 yours might be at a slightly different line number 
depending on the version your using):

{
   CARD32 temp;
   temp = pciReadLong(pMga->PciTag, PCI_CMD_STAT_REG);
   pciWriteLong(pMga->PciTag, PCI_CMD_STAT_REG, temp | 
PCI_CMD_MASTER_ENABLE);
}

-Jeff

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