Curiously, Aspire 3810T issues many SATA feature enable commands via _GTF, of which one is invalid and another is not supported by the drive. In the process, it also enables FPDMA non-zero offset. However, the feature also needs to be supported and enabled from the controller and it's wrong to enable it from _GTF unless the controller can do it by default. Currently, this ends up enabling FPDMA non-zero offset only on the drive side leading to NCQ command failures and eventual disabling of NCQ. This patch makes libata filter out FPDMA non-zero offset enable for the machine. This was reported by Marcus Meissner in bnc#522790. https://bugzilla.novell.com/show_bug.cgi?id=522790 Reported-by: Marcus Meissner <meissner@xxxxxxxxxx> --- This concludes the four patches to work around a device configuration issue caused by strange _GTF. This looks a bit pervasive for #upstream-fixes but the changes should only affect the problematic machine and be fairly safe. Thanks. drivers/ata/ahci.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) Index: ata/drivers/ata/ahci.c =================================================================== --- ata.orig/drivers/ata/ahci.c +++ ata/drivers/ata/ahci.c @@ -2858,6 +2858,50 @@ static bool ahci_broken_online(struct pc return pdev->bus->number == (val >> 8) && pdev->devfn == (val & 0xff); } +static void ahci_gtf_filter_workaround(struct ata_host *host) +{ + static const struct dmi_system_id sysids[] = { + /* + * Aspire 3810T issues a bunch of SATA enable commands + * via _GTF including an invalid one and one which is + * rejected by the device. Among the successful ones + * is FPDMA non-zero offset enable which when enabled + * only on the drive side leads to NCQ command + * failures. Filter it out. + */ + { + .ident = "Aspire 3810T", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3810T"), + }, + .driver_data = (void *)ATA_ACPI_FILTER_FPDMA_OFFSET, + }, + { } + }; + const struct dmi_system_id *dmi = dmi_first_match(sysids); + unsigned int filter; + int i; + + if (!dmi) + return; + + filter = (unsigned long)dmi->driver_data; + dev_printk(KERN_INFO, host->dev, + "applying extra ACPI _GTF filter 0x%x for %s\n", + filter, dmi->ident); + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + struct ata_link *link; + struct ata_device *dev; + + ata_for_each_link(link, ap, EDGE) + ata_for_each_dev(dev, link, ALL) + dev->gtf_filter |= filter; + } +} + static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { static int printed_version; @@ -3023,6 +3067,9 @@ static int ahci_init_one(struct pci_dev /* apply workaround for ASUS P5W DH Deluxe mainboard */ ahci_p5wdh_workaround(host); + /* apply gtf filter quirk */ + ahci_gtf_filter_workaround(host); + /* initialize adapter */ rc = ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64); if (rc) -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
