Workaround for 60x1-B2 errata PCI#7.
Write-combining may be unreliable when chip operates in PCI-X mode,
so disable write-combining when in PCI-X mode.
Also, update the errata comments at the top of sata_mv,
and include a note about errata PCI#11.
Signed-off-by: Mark Lord <mlord@xxxxxxxxx>
--
Expanding the original 3-part patch series to 7-parts now.
--- old/drivers/ata/sata_mv.c 2009-04-06 12:23:32.000000000 -0400
+++ new/drivers/ata/sata_mv.c 2009-04-06 13:24:28.000000000 -0400
@@ -28,10 +28,6 @@
/*
* sata_mv TODO list:
*
- * --> More errata workarounds for PCI-X.
- *
- * --> Complete a full errata audit for all chipsets to identify others.
- *
* --> Develop a low-power-consumption strategy, and implement it.
*
* --> Add sysfs attributes for per-chip / per-HC IRQ coalescing thresholds.
@@ -44,6 +40,15 @@
* connect two SATA ports.
*/
+/*
+ * 80x1-B2 errata PCI#11:
+ *
+ * Users of the 6041/6081 Rev.B2 chips (current is C0)
+ * should be careful to insert those cards only onto PCI-X bus #0,
+ * and only in device slots 0..7, not higher. The chips may not
+ * work correctly otherwise (note: this is a pretty rare condition).
+ */
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
@@ -181,6 +186,7 @@
/* PCI interface registers */
PCI_COMMAND_OFS = 0xc00,
+ PCI_COMMAND_MWRCOM = (1 << 4), /* PCI Master Write Combining */
PCI_COMMAND_MRDTRIG = (1 << 7), /* PCI Master Read Trigger */
PCI_MAIN_CMD_STS_OFS = 0xd30,
@@ -3527,6 +3533,18 @@
return 1; /* okay */
}
+static void mv_60x1b2_errata_pci7(struct ata_host *host)
+{
+ struct mv_host_priv *hpriv = host->private_data;
+ void __iomem *mmio = hpriv->base;
+
+ /* workaround for 60x1-B2 errata PCI#7 */
+ if (mv_in_pcix_mode(host)) {
+ u32 reg = readl(mmio + PCI_COMMAND_OFS);
+ writelfl(reg & ~PCI_COMMAND_MWRCOM, mmio + PCI_COMMAND_OFS);
+ }
+}
+
static int mv_chip_id(struct ata_host *host, unsigned int board_idx)
{
struct pci_dev *pdev = to_pci_dev(host->dev);
@@ -3580,6 +3598,7 @@
switch (pdev->revision) {
case 0x7:
+ mv_60x1b2_errata_pci7(host);
hp_flags |= MV_HP_ERRATA_60X1B2;
break;
case 0x9:
--
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