sata_mv: workaround for 60x1 errata sata13

The "B2" variant of the 6041/6081 (genII) chips requires
that the PHY_MODE3 register be rewritten after any write
to PHY_MODE4.

This fixes a regression introduced by an earlier patch.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 969a76987781..17093e600d80 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -72,7 +72,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME        "sata_mv"
-#define DRV_VERSION     "1.22"
+#define DRV_VERSION     "1.23"
 
 enum {
         /* BAR's are enumerated in terms of pci_resource_start() terms */
@@ -2557,7 +2557,6 @@ static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
          */
         m3 = readl(port_mmio + PHY_MODE3);
         m3 = (m3 & 0x1f) | (0x5555601 << 5);
-        writel(m3, port_mmio + PHY_MODE3);
 
         if (fix_phy_mode4) {
                 u32 m4;
@@ -2573,6 +2572,12 @@ static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
 
                 writel(m4, port_mmio + PHY_MODE4);
         }
+        /*
+         * Workaround for 60x1-B2 errata SATA#13:
+         * Any write to PHY_MODE4 (above) may corrupt PHY_MODE3,
+         * so we must always rewrite PHY_MODE3 after PHY_MODE4.
+         */
+        writel(m3, port_mmio + PHY_MODE3);
 
         /* Revert values of pre-emphasis and signal amps to the saved ones */
         m2 = readl(port_mmio + PHY_MODE2);