diff options
| author | Tejun Heo <tj@kernel.org> | 2010-05-31 16:26:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:11:05 -0700 |
| commit | da86663542979859c5b0e8f52aaf6f1745254b27 (patch) | |
| tree | 4a8db6a42bc45cff205fe0a9a60e4eee0ea9835d /drivers/ata/sata_via.c | |
| parent | 8d2b5b63d3586f3e258b8c5cffbdc45e743fcafa (diff) | |
sata_via: magic vt6421 fix for transmission problems w/ WD drives
commit 8b27ff4cf6d15964aa2987aeb58db4dfb1f87a19 upstream.
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.
https://bugzilla.kernel.org/show_bug.cgi?id=15173
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: Tejun Heo <tj@kernel.org>
Originally-from: Joseph Chan <JosephChan@via.com.tw>
Reported-by: Jorrit Tijben <sjorrit@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/ata/sata_via.c')
| -rw-r--r-- | drivers/ata/sata_via.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c index 02efd9a83d26..e35596b97853 100644 --- a/drivers/ata/sata_via.c +++ b/drivers/ata/sata_via.c @@ -558,6 +558,19 @@ static void svia_configure(struct pci_dev *pdev) tmp8 |= NATIVE_MODE_ALL; 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 <JosephChan@via.com.tw>. + * Please add proper documentation if possible. + * + * https://bugzilla.kernel.org/show_bug.cgi?id=15173 + */ + 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) |