diff options
| author | Richard Zhu <r65037@freescale.com> | 2012-07-10 10:31:06 +0800 |
|---|---|---|
| committer | Terry Lv <r65388@freescale.com> | 2012-07-25 13:10:41 +0800 |
| commit | ea4f073f9f8d9d655bfb30d7f14606337c49a106 (patch) | |
| tree | 106da9052fc7bce354adb369dcff0a3656569135 /drivers/ata | |
| parent | 464758b2d3a1af8fad402acdbb5f3a157b4accab (diff) | |
ENGR00215810-1 AHCI: sata drops to 1.5Gbps after suspend/resume several times
Add the AHCI platform suspend/resume function callback to
fix this issue.
Signed-off-by: Richard Zhu <Hong-Xing.Zhu@freescale.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/ahci_platform.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c index 6fef1fa75c54..936babd0fb9e 100644 --- a/drivers/ata/ahci_platform.c +++ b/drivers/ata/ahci_platform.c @@ -171,12 +171,78 @@ static int __devexit ahci_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static int ahci_device_suspend(struct platform_device *pdev, pm_message_t msg) +{ + struct device *dev = &pdev->dev; + struct ahci_platform_data *pdata = dev_get_platdata(dev); + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + void __iomem *mmio = hpriv->mmio; + u32 ctl; + int rc; + + if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { + dev_err(dev, "firmware update required for suspend/resume\n"); + return -EIO; + } + + /* + * AHCI spec rev1.1 section 8.3.3: + * Software must disable interrupts prior to requesting a + * transition of the HBA to D3 state. + */ + ctl = readl(mmio + HOST_CTL); + ctl &= ~HOST_IRQ_EN; + writel(ctl, mmio + HOST_CTL); + readl(mmio + HOST_CTL); /* flush */ + + rc = ata_host_suspend(host, msg); + if (rc) + return rc; + + if (pdata && pdata->suspend) + return pdata->suspend(dev); + return 0; +} + +static int ahci_device_resume(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ahci_platform_data *pdata = dev_get_platdata(dev); + struct ata_host *host = dev_get_drvdata(dev); + int rc; + + if (pdata && pdata->resume) { + rc = pdata->resume(dev); + if (rc) + return rc; + } + + if (dev->power.power_state.event == PM_EVENT_SUSPEND) { + rc = ahci_reset_controller(host); + if (rc) + return rc; + + ahci_init_controller(host); + } + + ata_host_resume(host); + + return 0; +} +#endif /* CONFIG_PM */ + static struct platform_driver ahci_driver = { .remove = __devexit_p(ahci_remove), .driver = { .name = "ahci", .owner = THIS_MODULE, }, +#ifdef CONFIG_PM + .suspend = ahci_device_suspend, + .resume = ahci_device_resume, +#endif }; static int __init ahci_init(void) |