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

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.

  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: default avatarTejun Heo <tj@kernel.org>
Originally-from: Joseph Chan <JosephChan@via.com.tw>
Reported-by: default avatarJorrit Tijben <sjorrit@gmail.com>
Cc: stable@kernel.org
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 67a3e12b

drivers/ata/sata_via.c

+13 −0
Original line number Diff line number Diff line
@@ -575,6 +575,19 @@ 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)