sata_mv: PHY_MODEx errata fixes
Fix and update the errata handling for the PHY_MODEx registers.
This improves receiver noise tolerance, among other things.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index f6a716e..a39779a 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2546,7 +2546,7 @@
hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
int fix_phy_mode4 =
hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
- u32 m2, tmp;
+ u32 m2, m3;
if (fix_phy_mode2) {
m2 = readl(port_mmio + PHY_MODE2);
@@ -2563,27 +2563,27 @@
udelay(200);
}
- /* who knows what this magic does */
- tmp = readl(port_mmio + PHY_MODE3);
- tmp &= ~0x7F800000;
- tmp |= 0x2A800000;
- writel(tmp, port_mmio + PHY_MODE3);
+ /*
+ * Gen-II/IIe PHY_MODE3 errata RM#2:
+ * Achieves better receiver noise performance than the h/w default:
+ */
+ m3 = readl(port_mmio + PHY_MODE3);
+ m3 = (m3 & 0x1f) | (0x5555601 << 5);
+ writel(m3, port_mmio + PHY_MODE3);
if (fix_phy_mode4) {
u32 m4;
m4 = readl(port_mmio + PHY_MODE4);
- if (hp_flags & MV_HP_ERRATA_60X1B2)
- tmp = readl(port_mmio + PHY_MODE3);
-
/* workaround for errata FEr SATA#10 (part 1) */
m4 = (m4 & ~(1 << 1)) | (1 << 0);
- writel(m4, port_mmio + PHY_MODE4);
+ /* enforce bit restrictions on GenIIe devices */
+ if (IS_GEN_IIE(hpriv))
+ m4 = (m4 & ~0x5DE3FFFC) | (1 << 2);
- if (hp_flags & MV_HP_ERRATA_60X1B2)
- writel(tmp, port_mmio + PHY_MODE3);
+ writel(m4, port_mmio + PHY_MODE4);
}
/* Revert values of pre-emphasis and signal amps to the saved ones */