Commit 8b27ff4c authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik

sata_via: magic vt6421 fix for transmission problems w/ WD drives

vt6421 has problems talking to recent WD drives.  It causes a lot of
transmission errors while high bandwidth transfer as reported in the
following bugzilla entry.

Joseph Chan provided the following fix.  I don't have any idea what it
does but I can verify the issue is gone with the patch applied.
Signed-off-by: default avatarTejun Heo <>
Originally-from: Joseph Chan <>
Reported-by: default avatarJorrit Tijben <>
Signed-off-by: default avatarJeff Garzik <>
parent 67a3e12b
......@@ -575,6 +575,19 @@ static void svia_configure(struct pci_dev *pdev)
pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
* vt6421 has problems talking to some drives. The following
* is the magic fix from Joseph Chan <>.
* Please add proper documentation if possible.
if (pdev->device == 0x3249) {
pci_read_config_byte(pdev, 0x52, &tmp8);
tmp8 |= 1 << 2;
pci_write_config_byte(pdev, 0x52, tmp8);
static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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