Commit 8b27ff4c authored May 31, 2010 by Tejun Heo Committed by Jeff Garzik Jun 02, 2010

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: Tejun Heo <tj@kernel.org>
Originally-from: Joseph Chan <JosephChan@via.com.tw>
Reported-by: Jorrit Tijben <sjorrit@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jeff 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)

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