sata_vsc: use default cache line size if non-zero

This modifies drivers/ata/sata_vsc.c to only set the cache line size
to 0x80 if the default value is zero. Apparently zero isn't allowed
due to a bug in the chip, but I've found performance is much better
with the (non-zero) default instead of 0x80.

[note1: "default" means BIOS-programmed value, in this context -jgarzik]

[note2: superfluous braces were removed from the patch -jg]

Signed-off-by: Nate Dailey <nate.dailey@stratus.com>
Signed-off-by: Jeremy Higdon <jeremy@sgi.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index 3d9daf231115..2fd037bde090 100644
--- a/drivers/ata/sata_vsc.c
+++ b/drivers/ata/sata_vsc.c
@@ -346,6 +346,7 @@ static int __devinit vsc_sata_init_one (struct pci_dev *pdev, const struct pci_d
         struct ata_probe_ent *probe_ent;
         void __iomem *mmio_base;
         int rc;
+        u8 cls;
 
         if (!printed_version++)
                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
@@ -383,9 +384,12 @@ static int __devinit vsc_sata_init_one (struct pci_dev *pdev, const struct pci_d
         INIT_LIST_HEAD(&probe_ent->node);
 
         /*
-         * Due to a bug in the chip, the default cache line size can't be used
+         * Due to a bug in the chip, the default cache line size can't be
+         * used (unless the default is non-zero).
          */
-        pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
+        pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cls);
+        if (cls == 0x00)
+                pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
 
         if (pci_enable_msi(pdev) == 0)
                 pci_intx(pdev, 0);