lkml.org 
[lkml]   [2008]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: ehci-hcd affects hda speed
Date
On Monday 17 March 2008, Rene Herman wrote:
> +       case PCI_VENDOR_ID_VIA:
> +               if (pdev->device == 0x3104 && pdev->revision >= 0x60) {

Unless you have specific docs from VIA saying that this register
isn't revision-specific (at least in the sense that all revisions
after 0x60 define that bit in that way), this should probably be a
switch on pdev->revision and just include the known-safe revisions.

At one point I had a table mapping those revision codes to
specific VIA chips. Too bad I didn't keep it. ISTR that the
VT6212 has a newer revision code than the vt8235 southbridge,
and probably not as new as the vt8237 one...

But otherwise, yes -- that's the kind of patch I'd sign off on
after making this comment a bit more informative about how
that 1 usec sleep time creates an amount of PCI bus hogging.


> +                       u8 tmp;
> +
> +                       /* VT6212: EHCI sleep time 10us (default 1) */
> +                       pci_read_config_byte(pdev, 0x4b, &tmp);
> +                       pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
> +               }
> +               break;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2008-03-18 01:03    [W:0.093 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site