Re: 2.4.x, drm, g400 and pci_set_master

From: Petr Vandrovec (
Date: Thu Feb 08 2001 - 12:39:19 EST

On 8 Feb 01 at 12:15, Alex Deucher wrote:

> I wasn't talking about the drm driver I was talking about programming
> the PCI controller directly using setpci 1.0.0 .... or some such
> command, I can't remember off hand. Which turns on busmastering if it
> is off for a particular device.


> Jeff Hartmann wrote:
> >
> > 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 |
> > }

Jeff, do you say that drm code does not use dynamic DMA mapping, which is
specified as only busmastering interface for kernels 2.4.x, at all? Now
I understand what had one friend in the mind when he laughed when I said
that it must be easy to get it to work on Alpha...
                            Thanks anyway for all suggestions,
                                        Petr Vandrovec
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