Adding linux-pm mailing list to CC, since this is PM related.
On 10/30/2011 11:51 AM, JiSheng Zhang wrote:
>
> Signed-off-by: JiSheng Zhang <jszhang3@xxxxxxxxx>
> ---
> drivers/ata/ahci_platform.c | 54 +++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 54 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index c03277d..60ff9eb 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -202,12 +202,66 @@ static int __devexit ahci_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM
> +static int ahci_suspend(struct platform_device *pdev, pm_message_t mesg)
> +{
> + struct ata_host *host = dev_get_drvdata(&pdev->dev);
> + struct ahci_host_priv *hpriv = host->private_data;
> + void __iomem *mmio = hpriv->mmio;
> + u32 ctl;
> +
> + if (mesg.event & PM_EVENT_SLEEP) {
> + /* 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 */
> + }
> +
> + return ata_host_suspend(host, mesg);
> +}
> +
> +static int ahci_resume(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct ahci_platform_data *pdata = dev->platform_data;
> + struct ata_host *host = dev_get_drvdata(dev);
> + struct ahci_host_priv *hpriv = host->private_data;
> + int rc;
> +
> + if (pdata && pdata->init) {
> + rc = pdata->init(dev, hpriv->mmio);
> + if (rc)
> + return rc;
> + }
> +
> + if (pdev->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
> +
> static struct platform_driver ahci_driver = {
> .remove = __devexit_p(ahci_remove),
> .driver = {
> .name = "ahci",
> .owner = THIS_MODULE,
> },
> +#ifdef CONFIG_PM
> + .suspend = ahci_suspend,
> + .resume = ahci_resume,
> +#endif
> .id_table = ahci_devtype,
> };
>
--
Regards,
Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Linux Technology Center,
IBM India Systems and Technology Lab
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