From 62694735ca95c74dac4eb9068d59801ac0ddebaf Mon Sep 17 00:00:00 2001 From: Sujit Reddy Thumma Date: Tue, 30 Jul 2013 00:36:00 +0530 Subject: [SCSI] ufs: Add runtime PM support for UFS host controller driver Add runtime PM helpers to suspend/resume UFS controller at runtime. Enable runtime PM by default for pci and platform drivers as the initialized hardware can suspend if it is not used after bootup. Signed-off-by: Sujit Reddy Thumma Signed-off-by: Santosh Y Signed-off-by: James Bottomley --- drivers/scsi/ufs/ufshcd-pci.c | 62 ++++++++++++++++++++++++++++++++++++++----- 1 file changed, 56 insertions(+), 6 deletions(-) (limited to 'drivers/scsi/ufs/ufshcd-pci.c') diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index 48be39a6f6d7..57ea9dd40bf4 100644 --- a/drivers/scsi/ufs/ufshcd-pci.c +++ b/drivers/scsi/ufs/ufshcd-pci.c @@ -35,6 +35,7 @@ #include "ufshcd.h" #include +#include #ifdef CONFIG_PM /** @@ -44,7 +45,7 @@ * * Returns -ENOSYS */ -static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state) +static int ufshcd_pci_suspend(struct device *dev) { /* * TODO: @@ -61,7 +62,7 @@ static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state) * * Returns -ENOSYS */ -static int ufshcd_pci_resume(struct pci_dev *pdev) +static int ufshcd_pci_resume(struct device *dev) { /* * TODO: @@ -71,8 +72,45 @@ static int ufshcd_pci_resume(struct pci_dev *pdev) return -ENOSYS; } +#else +#define ufshcd_pci_suspend NULL +#define ufshcd_pci_resume NULL #endif /* CONFIG_PM */ +#ifdef CONFIG_PM_RUNTIME +static int ufshcd_pci_runtime_suspend(struct device *dev) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + if (!hba) + return 0; + + return ufshcd_runtime_suspend(hba); +} +static int ufshcd_pci_runtime_resume(struct device *dev) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + if (!hba) + return 0; + + return ufshcd_runtime_resume(hba); +} +static int ufshcd_pci_runtime_idle(struct device *dev) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + if (!hba) + return 0; + + return ufshcd_runtime_idle(hba); +} +#else /* !CONFIG_PM_RUNTIME */ +#define ufshcd_pci_runtime_suspend NULL +#define ufshcd_pci_runtime_resume NULL +#define ufshcd_pci_runtime_idle NULL +#endif /* CONFIG_PM_RUNTIME */ + /** * ufshcd_pci_shutdown - main function to put the controller in reset state * @pdev: pointer to PCI device handle @@ -91,6 +129,9 @@ static void ufshcd_pci_remove(struct pci_dev *pdev) { struct ufs_hba *hba = pci_get_drvdata(pdev); + pm_runtime_forbid(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + disable_irq(pdev->irq); ufshcd_remove(hba); pci_release_regions(pdev); @@ -168,6 +209,8 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) } pci_set_drvdata(pdev, hba); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_allow(&pdev->dev); return 0; @@ -182,6 +225,14 @@ out_error: return err; } +static const struct dev_pm_ops ufshcd_pci_pm_ops = { + .suspend = ufshcd_pci_suspend, + .resume = ufshcd_pci_resume, + .runtime_suspend = ufshcd_pci_runtime_suspend, + .runtime_resume = ufshcd_pci_runtime_resume, + .runtime_idle = ufshcd_pci_runtime_idle, +}; + static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = { { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, { } /* terminate list */ @@ -195,10 +246,9 @@ static struct pci_driver ufshcd_pci_driver = { .probe = ufshcd_pci_probe, .remove = ufshcd_pci_remove, .shutdown = ufshcd_pci_shutdown, -#ifdef CONFIG_PM - .suspend = ufshcd_pci_suspend, - .resume = ufshcd_pci_resume, -#endif + .driver = { + .pm = &ufshcd_pci_pm_ops + }, }; module_pci_driver(ufshcd_pci_driver); -- cgit