diff options
| author | Mark Lord <liml@rtr.ca> | 2009-04-06 15:24:14 -0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2009-04-06 20:13:48 -0400 |
| commit | 65ad7fef10b50b6c06d6165fa847e2d3636b0a66 (patch) | |
| tree | 500afce9205d59853e14901813ae4f6689210019 | |
| parent | c361acbc59c434315f8649ab06e5b7d5b297d1b7 (diff) | |
sata_mv: workaround errata PCI#7
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@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
| -rw-r--r-- | drivers/ata/sata_mv.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index a49643d16f3..b0c929d3623 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -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 @@ enum { /* 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 @@ static int mv_pci_cut_through_okay(struct ata_host *host) 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 @@ static int mv_chip_id(struct ata_host *host, unsigned int board_idx) switch (pdev->revision) { case 0x7: + mv_60x1b2_errata_pci7(host); hp_flags |= MV_HP_ERRATA_60X1B2; break; case 0x9: |