diff options
| -rw-r--r-- | drivers/ata/ahci.c | 48 |
1 files changed, 29 insertions, 19 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 53f5afd9420c..bbfccdbba3ab 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -49,6 +49,10 @@ #define DRV_NAME "ahci" #define DRV_VERSION "3.0" +static int ahci_skip_host_reset; +module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444); +MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)"); + static int ahci_enable_alpm(struct ata_port *ap, enum link_pm policy); static void ahci_disable_alpm(struct ata_port *ap); @@ -1088,29 +1092,35 @@ static int ahci_reset_controller(struct ata_host *host) ahci_enable_ahci(mmio); /* global controller reset */ - tmp = readl(mmio + HOST_CTL); - if ((tmp & HOST_RESET) == 0) { - writel(tmp | HOST_RESET, mmio + HOST_CTL); - readl(mmio + HOST_CTL); /* flush */ - } + if (!ahci_skip_host_reset) { + tmp = readl(mmio + HOST_CTL); + if ((tmp & HOST_RESET) == 0) { + writel(tmp | HOST_RESET, mmio + HOST_CTL); + readl(mmio + HOST_CTL); /* flush */ + } - /* reset must complete within 1 second, or - * the hardware should be considered fried. - */ - ssleep(1); + /* reset must complete within 1 second, or + * the hardware should be considered fried. + */ + ssleep(1); - tmp = readl(mmio + HOST_CTL); - if (tmp & HOST_RESET) { - dev_printk(KERN_ERR, host->dev, - "controller reset failed (0x%x)\n", tmp); - return -EIO; - } + tmp = readl(mmio + HOST_CTL); + if (tmp & HOST_RESET) { + dev_printk(KERN_ERR, host->dev, + "controller reset failed (0x%x)\n", tmp); + return -EIO; + } - /* turn on AHCI mode */ - ahci_enable_ahci(mmio); + /* turn on AHCI mode */ + ahci_enable_ahci(mmio); - /* some registers might be cleared on reset. restore initial values */ - ahci_restore_initial_config(host); + /* Some registers might be cleared on reset. Restore + * initial values. + */ + ahci_restore_initial_config(host); + } else + dev_printk(KERN_INFO, host->dev, + "skipping global host reset\n"); if (pdev->vendor == PCI_VENDOR_ID_INTEL) { u16 tmp16; |