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path: root/drivers/ata/sata_vsc.c
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Diffstat (limited to 'drivers/ata/sata_vsc.c')
-rw-r--r--drivers/ata/sata_vsc.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index 3d9daf23111..2fd037bde09 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);