> -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx > [mailto:linux-scsi-owner@xxxxxxxxxxxxxxx] On Behalf Of Dolev Raviv > Sent: Thursday, August 14, 2014 9:31 PM > To: James.Bottomley@xxxxxxxxxxxxxxxxxxxxx; hch@xxxxxxxxxxxxx > Cc: linux-scsi@xxxxxxxxxxxxxxx; linux-scsi-owner@xxxxxxxxxxxxxxx; > linux-arm-msm@xxxxxxxxxxxxxxx; santoshsy@xxxxxxxxx; Subhash Jadavani; > Dolev Raviv; Sujit Reddy Thumma > Subject: [PATCH/RFC V2 10/16] scsi: ufs: add UFS power management support > > From: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> > > This patch adds support for UFS device and UniPro link power management > during runtime/system PM. > > Main idea is to define multiple UFS low power levels based on UFS device and > UFS link power states. This would allow any specific platform or pci driver to > choose the best suited low power level during runtime and system suspend > based on their power goals. > > bkops handlig: > To put the UFS device in sleep state when bkops is disabled, first query the > bkops status from the device and enable bkops on device only if device needs > time to perform the bkops. > > START_STOP handling: > Before sending START_STOP_UNIT to the device well-known logical unit > (w-lun) to make sure that the device w-lun unit attention condition is cleared. > > Write protection: > UFS device specification allows LUs to be write protected, either permanently > or power on write protected. If any LU is power on write protected and if the > card is power cycled (by powering off VCCQ and/or VCC rails), LU's write > protect status would be lost. So this means those LUs can be written now. To > ensures that UFS device is power cycled only if the power on protect is not set > for any of the LUs, check if power on write protect is set and if device is in > sleep/power-off state & link in inactive state (Hibern8 or OFF state). > If none of the Logical Units on UFS device is power on write protected then all > UFS device power rails (VCC, VCCQ & VCCQ2) can be turned off if UFS device is > in power-off state and UFS link is in OFF state. But current implementation > would disable all device power rails even if UFS link is not in OFF state. > > Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> > Signed-off-by: Dolev Raviv <draviv@xxxxxxxxxxxxxx> > Signed-off-by: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx> > > diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index > bcc3a7f..2a82959 100644 > --- a/drivers/scsi/ufs/ufs.h > +++ b/drivers/scsi/ufs/ufs.h > @@ -129,6 +129,7 @@ enum { > /* Flag idn for Query Requests*/ > enum flag_idn { > QUERY_FLAG_IDN_FDEVICEINIT = 0x01, > + QUERY_FLAG_IDN_PWR_ON_WPE = 0x03, > QUERY_FLAG_IDN_BKOPS_EN = 0x04, > }; > > @@ -194,6 +195,18 @@ enum unit_desc_param { > UNIT_DESC_PARAM_LARGE_UNIT_SIZE_M1 = 0x22, > }; > > +/* > + * Logical Unit Write Protect > + * 00h: LU not write protected > + * 01h: LU write protected when fPowerOnWPEn =1 > + * 02h: LU permanently write protected when fPermanentWPEn =1 */ enum > +ufs_lu_wp_type { > + UFS_LU_NO_WP = 0x00, > + UFS_LU_POWER_ON_WP = 0x01, > + UFS_LU_PERM_WP = 0x02, > +}; > + > /* bActiveICCLevel parameter current units */ enum { > UFSHCD_NANO_AMP = 0, > @@ -226,11 +239,12 @@ enum { > }; > > /* Background operation status */ > -enum { > +enum bkops_status { > BKOPS_STATUS_NO_OP = 0x0, > BKOPS_STATUS_NON_CRITICAL = 0x1, > BKOPS_STATUS_PERF_IMPACT = 0x2, > BKOPS_STATUS_CRITICAL = 0x3, > + BKOPS_STATUS_MAX = BKOPS_STATUS_CRITICAL, > }; > > /* UTP QUERY Transaction Specific Fields OpCode */ @@ -291,6 +305,14 @@ > enum { > UPIU_TASK_MANAGEMENT_FUNC_FAILED = 0x05, > UPIU_INCORRECT_LOGICAL_UNIT_NO = 0x09, > }; > + > +/* UFS device power modes */ > +enum ufs_dev_pwr_mode { > + UFS_ACTIVE_PWR_MODE = 1, > + UFS_SLEEP_PWR_MODE = 2, > + UFS_POWERDOWN_PWR_MODE = 3, > +}; > + > /** > * struct utp_upiu_header - UPIU header structure > * @dword_0: UPIU header DW-0 > @@ -437,6 +459,12 @@ struct ufs_query_res { > #define UFS_VREG_VCCQ2_MIN_UV 1650000 /* uV */ > #define UFS_VREG_VCCQ2_MAX_UV 1950000 /* uV */ > > +/* > + * VCCQ & VCCQ2 current requirement when UFS device is in sleep state > + * and link is in Hibern8 state. > + */ > +#define UFS_VREG_LPM_LOAD_UA 1000 /* uA */ > + > struct ufs_vreg { > struct regulator *reg; > const char *name; > @@ -453,4 +481,10 @@ struct ufs_vreg_info { > struct ufs_vreg *vccq2; > }; > > +struct ufs_dev_info { > + bool f_power_on_wp_en; > + /* Keeps information if any of the LU is power on write protected */ > + bool is_lu_power_on_wp; > +}; > + > #endif /* End of Header */ > diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index > 1aac2ef..b8f7774 100644 > --- a/drivers/scsi/ufs/ufshcd-pci.c > +++ b/drivers/scsi/ufs/ufshcd-pci.c > @@ -43,34 +43,24 @@ > * @pdev: pointer to PCI device handle > * @state: power state > * > - * Returns -ENOSYS > + * Returns 0 if successful > + * Returns non-zero otherwise > */ > static int ufshcd_pci_suspend(struct device *dev) { > - /* > - * TODO: > - * 1. Call ufshcd_suspend > - * 2. Do bus specific power management > - */ > - > - return -ENOSYS; > + return ufshcd_system_suspend(dev_get_drvdata(dev)); > } > > /** > * ufshcd_pci_resume - resume power management function > * @pdev: pointer to PCI device handle > * > - * Returns -ENOSYS > + * Returns 0 if successful > + * Returns non-zero otherwise > */ > static int ufshcd_pci_resume(struct device *dev) { > - /* > - * TODO: > - * 1. Call ufshcd_resume. > - * 2. Do bus specific wake up > - */ > - > - return -ENOSYS; > + return ufshcd_system_resume(dev_get_drvdata(dev)); > } > #else > #define ufshcd_pci_suspend NULL > @@ -80,30 +70,15 @@ static int ufshcd_pci_resume(struct device *dev) > #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); > + return ufshcd_runtime_suspend(dev_get_drvdata(dev)); > } > 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); > + return ufshcd_runtime_resume(dev_get_drvdata(dev)); > } > 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); > + return ufshcd_runtime_idle(dev_get_drvdata(dev)); > } > #else /* !CONFIG_PM_RUNTIME */ > #define ufshcd_pci_runtime_suspend NULL > @@ -117,7 +92,7 @@ static int ufshcd_pci_runtime_idle(struct device *dev) > */ > static void ufshcd_pci_shutdown(struct pci_dev *pdev) { > - ufshcd_hba_stop((struct ufs_hba *)pci_get_drvdata(pdev)); > + ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev)); > } > > /** > diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c > index 642d80f..edaccd0 100644 > --- a/drivers/scsi/ufs/ufshcd-pltfrm.c > +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c > @@ -216,45 +216,24 @@ out: > * ufshcd_pltfrm_suspend - suspend power management function > * @dev: pointer to device handle > * > - * > - * Returns 0 > + * Returns 0 if successful > + * Returns non-zero otherwise > */ > static int ufshcd_pltfrm_suspend(struct device *dev) { > - struct platform_device *pdev = to_platform_device(dev); > - struct ufs_hba *hba = platform_get_drvdata(pdev); > - > - /* > - * TODO: > - * 1. Call ufshcd_suspend > - * 2. Do bus specific power management > - */ > - > - disable_irq(hba->irq); > - > - return 0; > + return ufshcd_system_suspend(dev_get_drvdata(dev)); > } > > /** > * ufshcd_pltfrm_resume - resume power management function > * @dev: pointer to device handle > * > - * Returns 0 > + * Returns 0 if successful > + * Returns non-zero otherwise > */ > static int ufshcd_pltfrm_resume(struct device *dev) { > - struct platform_device *pdev = to_platform_device(dev); > - struct ufs_hba *hba = platform_get_drvdata(pdev); > - > - /* > - * TODO: > - * 1. Call ufshcd_resume. > - * 2. Do bus specific wake up > - */ > - > - enable_irq(hba->irq); > - > - return 0; > + return ufshcd_system_resume(dev_get_drvdata(dev)); > } > #else > #define ufshcd_pltfrm_suspend NULL > @@ -264,30 +243,15 @@ static int ufshcd_pltfrm_resume(struct device *dev) > #ifdef CONFIG_PM_RUNTIME static int > ufshcd_pltfrm_runtime_suspend(struct device *dev) { > - struct ufs_hba *hba = dev_get_drvdata(dev); > - > - if (!hba) > - return 0; > - > - return ufshcd_runtime_suspend(hba); > + return ufshcd_runtime_suspend(dev_get_drvdata(dev)); > } > static int ufshcd_pltfrm_runtime_resume(struct device *dev) { > - struct ufs_hba *hba = dev_get_drvdata(dev); > - > - if (!hba) > - return 0; > - > - return ufshcd_runtime_resume(hba); > + return ufshcd_runtime_resume(dev_get_drvdata(dev)); > } > static int ufshcd_pltfrm_runtime_idle(struct device *dev) { > - struct ufs_hba *hba = dev_get_drvdata(dev); > - > - if (!hba) > - return 0; > - > - return ufshcd_runtime_idle(hba); > + return ufshcd_runtime_idle(dev_get_drvdata(dev)); > } > #else /* !CONFIG_PM_RUNTIME */ > #define ufshcd_pltfrm_runtime_suspend NULL > @@ -295,6 +259,11 @@ static int ufshcd_pltfrm_runtime_idle(struct device > *dev) > #define ufshcd_pltfrm_runtime_idle NULL > #endif /* CONFIG_PM_RUNTIME */ > > +static void ufshcd_pltfrm_shutdown(struct platform_device *pdev) { > + ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev)); } > + > /** > * ufshcd_pltfrm_probe - probe routine of the driver > * @pdev: pointer to Platform device handle @@ -395,6 +364,7 @@ static > const struct dev_pm_ops ufshcd_dev_pm_ops = { static struct > platform_driver ufshcd_pltfrm_driver = { > .probe = ufshcd_pltfrm_probe, > .remove = ufshcd_pltfrm_remove, > + .shutdown = ufshcd_pltfrm_shutdown, > .driver = { > .name = "ufshcd", > .owner = THIS_MODULE, > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index > 876d210..fac71c9 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -44,7 +44,6 @@ > > #define UFSHCD_ENABLE_INTRS (UTP_TRANSFER_REQ_COMPL |\ > UTP_TASK_REQ_COMPL |\ > - UIC_POWER_MODE |\ > UFSHCD_ERROR_MASK) > /* UIC command timeout, unit: ms */ > #define UIC_CMD_TIMEOUT 500 > @@ -138,12 +137,63 @@ enum { > #define ufshcd_clear_eh_in_progress(h) \ > (h->eh_flags &= ~UFSHCD_EH_IN_PROGRESS) > > +#define ufshcd_set_ufs_dev_active(h) \ > + ((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE) #define > +ufshcd_set_ufs_dev_sleep(h) \ > + ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE) #define > +ufshcd_set_ufs_dev_poweroff(h) \ > + ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE) #define > +ufshcd_is_ufs_dev_active(h) \ > + ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE) #define > +ufshcd_is_ufs_dev_sleep(h) \ > + ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE) #define > +ufshcd_is_ufs_dev_poweroff(h) \ > + ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE) > + > +static struct ufs_pm_lvl_states ufs_pm_lvl_states[] = { > + {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE}, > + {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE}, > + {UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE}, > + {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE}, > + {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE}, > + {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE}, }; > + > +static inline enum ufs_dev_pwr_mode > +ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl) { > + return ufs_pm_lvl_states[lvl].dev_state; } > + > +static inline enum uic_link_state > +ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl) { > + return ufs_pm_lvl_states[lvl].link_state; > +} > + > static void ufshcd_tmc_handler(struct ufs_hba *hba); static void > ufshcd_async_scan(void *data, async_cookie_t cookie); static int > ufshcd_reset_and_restore(struct ufs_hba *hba); static int > ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); static void > ufshcd_hba_exit(struct ufs_hba *hba); static int ufshcd_probe_hba(struct > ufs_hba *hba); > +static int ufshcd_host_reset_and_restore(struct ufs_hba *hba); > + > +static inline void ufshcd_enable_irq(struct ufs_hba *hba) { > + if (!hba->is_irq_enabled) { > + enable_irq(hba->irq); > + hba->is_irq_enabled = true; > + } > +} > + > +static inline void ufshcd_disable_irq(struct ufs_hba *hba) { > + if (hba->is_irq_enabled) { > + disable_irq(hba->irq); > + hba->is_irq_enabled = false; > + } > +} > > /* > * ufshcd_wait_for_register - wait for register value to change @@ -1778,44 > +1828,48 @@ out: > EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr); > > /** > - * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage > - * using DME_SET primitives. > + * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link > + power > + * state) and waits for it to take effect. > + * > * @hba: per adapter instance > - * @mode: powr mode value > + * @cmd: UIC command to execute > + * > + * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER > & > + * DME_HIBERNATE_EXIT commands take some time to take its effect on > + both host > + * and device UniPro link and hence it's final completion would be > + indicated by > + * dedicated status bits in Interrupt Status register (UPMS, UHES, > + UHXS) in > + * addition to normal UIC command completion Status (UCCS). This > + function only > + * returns after the relevant status bits indicate the completion. > * > * Returns 0 on success, non-zero value on failure > */ > -static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode) > +int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd) > { > - struct uic_command uic_cmd = {0}; > - struct completion pwr_done; > + struct completion uic_async_done; > unsigned long flags; > u8 status; > int ret; > > - uic_cmd.command = UIC_CMD_DME_SET; > - uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE); > - uic_cmd.argument3 = mode; > - init_completion(&pwr_done); > - > mutex_lock(&hba->uic_cmd_mutex); > + init_completion(&uic_async_done); > > spin_lock_irqsave(hba->host->host_lock, flags); > - hba->pwr_done = &pwr_done; > + hba->uic_async_done = &uic_async_done; > spin_unlock_irqrestore(hba->host->host_lock, flags); > - ret = __ufshcd_send_uic_cmd(hba, &uic_cmd); > + > + ret = __ufshcd_send_uic_cmd(hba, cmd); > if (ret) { > dev_err(hba->dev, > - "pwr mode change with mode 0x%x uic error %d\n", > - mode, ret); > + "pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n", > + cmd->command, cmd->argument3, ret); > goto out; > } > > - if (!wait_for_completion_timeout(hba->pwr_done, > + if (!wait_for_completion_timeout(hba->uic_async_done, > msecs_to_jiffies(UIC_CMD_TIMEOUT))) { > dev_err(hba->dev, > - "pwr mode change with mode 0x%x completion timeout\n", > - mode); > + "pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n", > + cmd->command, cmd->argument3); > ret = -ETIMEDOUT; > goto out; > } > @@ -1823,19 +1877,62 @@ static int ufshcd_uic_change_pwr_mode(struct > ufs_hba *hba, u8 mode) > status = ufshcd_get_upmcrs(hba); > if (status != PWR_LOCAL) { > dev_err(hba->dev, > - "pwr mode change failed, host umpcrs:0x%x\n", > - status); > + "pwr ctrl cmd 0x%0x failed, host umpcrs:0x%x\n", > + cmd->command, status); > ret = (status != PWR_OK) ? status : -1; > } > out: > spin_lock_irqsave(hba->host->host_lock, flags); > - hba->pwr_done = NULL; > + hba->uic_async_done = NULL; > spin_unlock_irqrestore(hba->host->host_lock, flags); > mutex_unlock(&hba->uic_cmd_mutex); > return ret; > } > > /** > + * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage > + * using DME_SET primitives. > + * @hba: per adapter instance > + * @mode: powr mode value > + * > + * Returns 0 on success, non-zero value on failure */ static int > +ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode) { > + struct uic_command uic_cmd = {0}; > + > + uic_cmd.command = UIC_CMD_DME_SET; > + uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE); > + uic_cmd.argument3 = mode; > + > + return ufshcd_uic_pwr_ctrl(hba, &uic_cmd); } > + > +static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba) { > + struct uic_command uic_cmd = {0}; > + > + uic_cmd.command = UIC_CMD_DME_HIBER_ENTER; > + > + return ufshcd_uic_pwr_ctrl(hba, &uic_cmd); } > + > +static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba) { > + struct uic_command uic_cmd = {0}; > + int ret; > + > + uic_cmd.command = UIC_CMD_DME_HIBER_EXIT; > + ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd); > + if (ret) { > + ufshcd_set_link_off(hba); > + ret = ufshcd_host_reset_and_restore(hba); > + } > + > + return ret; > +} > + > +/** > * ufshcd_config_max_pwr_mode - Set & Change power mode with > * maximum capability attribute information. > * @hba: per adapter instance > @@ -2034,6 +2131,9 @@ static int ufshcd_hba_enable(struct ufs_hba *hba) > msleep(5); > } > > + /* UniPro link is disabled at this point */ > + ufshcd_set_link_off(hba); > + > if (hba->vops && hba->vops->hce_enable_notify) > hba->vops->hce_enable_notify(hba, PRE_CHANGE); > > @@ -2066,7 +2166,7 @@ static int ufshcd_hba_enable(struct ufs_hba *hba) > } > > /* enable UIC related interrupts */ > - ufshcd_enable_intr(hba, UIC_COMMAND_COMPL); > + ufshcd_enable_intr(hba, UFSHCD_UIC_MASK); > > if (hba->vops && hba->vops->hce_enable_notify) > hba->vops->hce_enable_notify(hba, POST_CHANGE); @@ -2195,6 > +2295,62 @@ static void ufshcd_set_queue_depth(struct scsi_device *sdev) > scsi_activate_tcq(sdev, lun_qdepth); > } > > +/* > + * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT > +DESCRIPTOR > + * @hba: per-adapter instance > + * @lun: UFS device lun id > + * @b_lu_write_protect: pointer to buffer to hold the LU's write > +protect info > + * > + * Returns 0 in case of success and b_lu_write_protect status would be > +returned > + * @b_lu_write_protect parameter. > + * Returns -ENOTSUPP if reading b_lu_write_protect is not supported. > + * Returns -EINVAL in case of invalid parameters passed to this function. > + */ > +static int ufshcd_get_lu_wp(struct ufs_hba *hba, > + u8 lun, > + u8 *b_lu_write_protect) > +{ > + int ret; > + > + if (!b_lu_write_protect) > + ret = -EINVAL; > + /* > + * According to UFS device spec, RPMB LU can't be write > + * protected so skip reading bLUWriteProtect parameter for > + * it. For other W-LUs, UNIT DESCRIPTOR is not available. > + */ > + else if (lun >= UFS_UPIU_MAX_GENERAL_LUN) > + ret = -ENOTSUPP; > + else > + ret = ufshcd_read_unit_desc_param(hba, > + lun, > + UNIT_DESC_PARAM_LU_WR_PROTECT, > + b_lu_write_protect, > + sizeof(*b_lu_write_protect)); > + return ret; > +} > + > +/** > + * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect > + * status > + * @hba: per-adapter instance > + * @sdev: pointer to SCSI device > + * > + */ > +static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba, > + struct scsi_device *sdev) > +{ > + if (hba->dev_info.f_power_on_wp_en && > + !hba->dev_info.is_lu_power_on_wp) { > + u8 b_lu_write_protect; > + > + if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun), > + &b_lu_write_protect) && > + (b_lu_write_protect == UFS_LU_POWER_ON_WP)) > + hba->dev_info.is_lu_power_on_wp = true; > + } > +} > + > /** > * ufshcd_slave_alloc - handle initial SCSI device configurations > * @sdev: pointer to SCSI device > @@ -2221,6 +2377,21 @@ static int ufshcd_slave_alloc(struct scsi_device > *sdev) > > ufshcd_set_queue_depth(sdev); > > + ufshcd_get_lu_power_on_wp_status(hba, sdev); > + > + /* > + * For selecting the UFS device power mode (Active / UFS_Sleep / > + * UFS_PowerDown), SCSI power management command (START STOP > UNIT) > + * needs to be sent to a "UFS device" Well known Logical Unit (W-LU). > + * As this command would be sent during the UFS host controller > + * runtime/system PM callbacks, we need a reference to "scsi_device" > + * associated to "UFS device" W-LU. This change saves the "scsi_device" > + * reference for "UFS device" W-LU during slave_configure() callback > + * from SCSI mid layer. > + */ > + if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) > + hba->sdev_ufs_device = sdev; > + > return 0; > } > > @@ -2451,8 +2622,8 @@ static void ufshcd_uic_cmd_compl(struct ufs_hba > *hba, u32 intr_status) > complete(&hba->active_uic_cmd->done); > } > > - if ((intr_status & UIC_POWER_MODE) && hba->pwr_done) > - complete(hba->pwr_done); > + if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) > + complete(hba->uic_async_done); > } > > /** > @@ -2664,33 +2835,62 @@ static inline int ufshcd_get_bkops_status(struct > ufs_hba *hba, u32 *status) } > > /** > - * ufshcd_urgent_bkops - handle urgent bkops exception event > + * ufshcd_bkops_ctrl - control the auto bkops based on current bkops > + status > * @hba: per-adapter instance > + * @status: bkops_status value > * > - * Enable fBackgroundOpsEn flag in the device to permit background > - * operations. > + * Read the bkops_status from the UFS device and Enable > + fBackgroundOpsEn > + * flag in the device to permit background operations if the device > + * bkops_status is greater than or equal to "status" argument passed to > + * this function, disable otherwise. > + * > + * Returns 0 for success, non-zero in case of failure. > + * > + * NOTE: Caller of this function can check the > + "hba->auto_bkops_enabled" flag > + * to know whether auto bkops is enabled or disabled after this > + function > + * returns control to it. > */ > -static int ufshcd_urgent_bkops(struct ufs_hba *hba) > +static int ufshcd_bkops_ctrl(struct ufs_hba *hba, > + enum bkops_status status) > { > int err; > - u32 status = 0; > + u32 curr_status = 0; > > - err = ufshcd_get_bkops_status(hba, &status); > + err = ufshcd_get_bkops_status(hba, &curr_status); > if (err) { > dev_err(hba->dev, "%s: failed to get BKOPS status %d\n", > __func__, err); > goto out; > + } else if (curr_status > BKOPS_STATUS_MAX) { > + dev_err(hba->dev, "%s: invalid BKOPS status %d\n", > + __func__, curr_status); > + err = -EINVAL; > + goto out; > } > > - status = status & 0xF; > - > - /* handle only if status indicates performance impact or critical */ > - if (status >= BKOPS_STATUS_PERF_IMPACT) > + if (curr_status >= status) > err = ufshcd_enable_auto_bkops(hba); > + else > + err = ufshcd_disable_auto_bkops(hba); > out: > return err; > } > > +/** > + * ufshcd_urgent_bkops - handle urgent bkops exception event > + * @hba: per-adapter instance > + * > + * Enable fBackgroundOpsEn flag in the device to permit background > + * operations. > + * > + * If BKOPs is enabled, this function returns 0, 1 if the bkops in not > +enabled > + * and negative error value for any other failure. > + */ > +static int ufshcd_urgent_bkops(struct ufs_hba *hba) { > + return ufshcd_bkops_ctrl(hba, BKOPS_STATUS_PERF_IMPACT); } > + > static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status) { > return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, @@ > -2722,7 +2922,7 @@ static void ufshcd_exception_event_handler(struct > work_struct *work) > status &= hba->ee_ctrl_mask; > if (status & MASK_EE_URGENT_BKOPS) { > err = ufshcd_urgent_bkops(hba); > - if (err) > + if (err < 0) > dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n", > __func__, err); > } > @@ -3441,7 +3641,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) > if (ret) > goto out; > > - ufshcd_config_max_pwr_mode(hba); > + /* UniPro link is active now */ > + ufshcd_set_link_active(hba); > > ret = ufshcd_verify_dev_init(hba); > if (ret) > @@ -3451,14 +3652,29 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) > if (ret) > goto out; > > + /* UFS device is also active now */ > + ufshcd_set_ufs_dev_active(hba); > ufshcd_force_reset_auto_bkops(hba); > hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; > + hba->wlun_dev_clr_ua = true; > + > + ufshcd_config_max_pwr_mode(hba); > + > + /* > + * If we are in error handling context or in power management callbacks > + * context, no need to scan the host > + */ > + if (!ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) { > + bool flag; > + > + /* clear any previous UFS device information */ > + memset(&hba->dev_info, 0, sizeof(hba->dev_info)); > + if (!ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG, > + QUERY_FLAG_IDN_PWR_ON_WPE, &flag)) > + hba->dev_info.f_power_on_wp_en = flag; > > - /* If we are in error handling context no need to scan the host */ > - if (!ufshcd_eh_in_progress(hba)) { > if (!hba->is_init_prefetch) > ufshcd_init_icc_levels(hba); > - > scsi_scan_host(hba->host); > pm_runtime_put_sync(hba->dev); > } > @@ -3471,8 +3687,10 @@ out: > * If we failed to initialize the device or the device is not > * present, turn off the power/clocks etc. > */ > - if (ret && !ufshcd_eh_in_progress(hba)) > + if (ret && !ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) { > + pm_runtime_put_sync(hba->dev); > ufshcd_hba_exit(hba); > + } > > return ret; > } > @@ -3507,6 +3725,42 @@ static struct scsi_host_template > ufshcd_driver_template = { > .can_queue = UFSHCD_CAN_QUEUE, > }; > > +static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg, > + int ua) > +{ > + int ret = 0; > + struct regulator *reg = vreg->reg; > + const char *name = vreg->name; > + > + BUG_ON(!vreg); For the UFS host controller driver, which doesn't have the ufs_vreg structure for vcc and vccq, this function can cause kernel panic due to this BUG_ON(). Any reason to put a BUG_ON here instead of a NULL pointer checking? Thanks Chuanxiao > + > + ret = regulator_set_optimum_mode(reg, ua); > + if (ret >= 0) { > + /* > + * regulator_set_optimum_mode() returns new regulator > + * mode upon success. > + */ > + ret = 0; > + } else { > + dev_err(dev, "%s: %s set optimum mode(ua=%d) failed, err=%d\n", > + __func__, name, ua, ret); > + } > + > + return ret; > +} > + > +static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba, > + struct ufs_vreg *vreg) > +{ > + return ufshcd_config_vreg_load(hba->dev, vreg, > UFS_VREG_LPM_LOAD_UA); > +} > + > +static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba, > + struct ufs_vreg *vreg) > +{ > + return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA); } > + > static int ufshcd_config_vreg(struct device *dev, > struct ufs_vreg *vreg, bool on) > { > @@ -3527,18 +3781,9 @@ static int ufshcd_config_vreg(struct device *dev, > } > > uA_load = on ? vreg->max_uA : 0; > - ret = regulator_set_optimum_mode(reg, uA_load); > - if (ret >= 0) { > - /* > - * regulator_set_optimum_mode() returns new regulator > - * mode upon success. > - */ > - ret = 0; > - } else { > - dev_err(dev, "%s: %s set optimum mode(uA_load=%d) failed, > err=%d\n", > - __func__, name, uA_load, ret); > + ret = ufshcd_config_vreg_load(dev, vreg, uA_load); > + if (ret) > goto out; > - } > } > out: > return ret; > @@ -3654,7 +3899,8 @@ out: > return ret; > } > > -static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) > +static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, > + bool skip_ref_clk) > { > int ret = 0; > struct ufs_clk_info *clki; > @@ -3665,6 +3911,9 @@ static int ufshcd_setup_clocks(struct ufs_hba *hba, > bool on) > > list_for_each_entry(clki, head, list) { > if (!IS_ERR_OR_NULL(clki->clk)) { > + if (skip_ref_clk && !strcmp(clki->name, "ref_clk")) > + continue; > + > if (on && !clki->enabled) { > ret = clk_prepare_enable(clki->clk); > if (ret) { > @@ -3690,6 +3939,11 @@ out: > return ret; > } > > +static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) { > + return __ufshcd_setup_clocks(hba, on, false); } > + > static int ufshcd_init_clocks(struct ufs_hba *hba) { > int ret = 0; > @@ -3828,68 +4082,514 @@ static void ufshcd_hba_exit(struct ufs_hba *hba) > } > } > > +static int > +ufshcd_send_request_sense(struct ufs_hba *hba, struct scsi_device *sdp) > +{ > + unsigned char cmd[6] = {REQUEST_SENSE, > + 0, > + 0, > + 0, > + SCSI_SENSE_BUFFERSIZE, > + 0}; > + char *buffer; > + int ret; > + > + buffer = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL); > + if (!buffer) { > + ret = -ENOMEM; > + goto out; > + } > + > + ret = scsi_execute_req_flags(sdp, cmd, DMA_FROM_DEVICE, buffer, > + SCSI_SENSE_BUFFERSIZE, NULL, > + msecs_to_jiffies(1000), 3, NULL, REQ_PM); > + if (ret) > + pr_err("%s: failed with err %d\n", __func__, ret); > + > + kfree(buffer); > +out: > + return ret; > +} > + > /** > - * ufshcd_suspend - suspend power management function > + * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set > device > + * power mode > * @hba: per adapter instance > - * @state: power state > + * @pwr_mode: device power mode to set > * > - * Returns -ENOSYS > + * Returns 0 if requested power mode is set successfully > + * Returns non-zero if failed to set the requested power mode > */ > -int ufshcd_suspend(struct ufs_hba *hba, pm_message_t state) > +static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba, > + enum ufs_dev_pwr_mode pwr_mode) > { > + unsigned char cmd[6] = { START_STOP }; > + struct scsi_sense_hdr sshdr; > + struct scsi_device *sdp = hba->sdev_ufs_device; > + int ret; > + > + if (!sdp || !scsi_device_online(sdp)) > + return -ENODEV; > + > + /* > + * If scsi commands fail, the scsi mid-layer schedules scsi error- > + * handling, which would wait for host to be resumed. Since we know > + * we are functional while we are here, skip host resume in error > + * handling context. > + */ > + hba->host->eh_noresume = 1; > + if (hba->wlun_dev_clr_ua) { > + ret = ufshcd_send_request_sense(hba, sdp); > + if (ret) > + goto out; > + /* Unit attention condition is cleared now */ > + hba->wlun_dev_clr_ua = false; > + } > + > + cmd[4] = pwr_mode << 4; > + > /* > - * TODO: > - * 1. Block SCSI requests from SCSI midlayer > - * 2. Change the internal driver state to non operational > - * 3. Set UTRLRSR and UTMRLRSR bits to zero > - * 4. Wait until outstanding commands are completed > - * 5. Set HCE to zero to send the UFS host controller to reset state > + * Current function would be generally called from the power > management > + * callbacks hence set the REQ_PM flag so that it doesn't resume the > + * already suspended childs. > */ > + ret = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, > + START_STOP_TIMEOUT, 0, NULL, REQ_PM); > + if (ret) { > + sdev_printk(KERN_WARNING, sdp, > + "START_STOP failed for power mode: %d\n", pwr_mode); > + scsi_show_result(ret); > + if (driver_byte(ret) & DRIVER_SENSE) { > + scsi_show_sense_hdr(&sshdr); > + scsi_show_extd_sense(sshdr.asc, sshdr.ascq); > + } > + } > > - return -ENOSYS; > + if (!ret) > + hba->curr_dev_pwr_mode = pwr_mode; > +out: > + hba->host->eh_noresume = 0; > + return ret; > +} > + > +static int ufshcd_link_state_transition(struct ufs_hba *hba, > + enum uic_link_state req_link_state, > + int check_for_bkops) > +{ > + int ret = 0; > + > + if (req_link_state == hba->uic_link_state) > + return 0; > + > + if (req_link_state == UIC_LINK_HIBERN8_STATE) { > + ret = ufshcd_uic_hibern8_enter(hba); > + if (!ret) > + ufshcd_set_link_hibern8(hba); > + else > + goto out; > + } > + /* > + * If autobkops is enabled, link can't be turned off because > + * turning off the link would also turn off the device. > + */ > + else if ((req_link_state == UIC_LINK_OFF_STATE) && > + (!check_for_bkops || (check_for_bkops && > + !hba->auto_bkops_enabled))) { > + /* > + * Change controller state to "reset state" which > + * should also put the link in off/reset state > + */ > + ufshcd_hba_stop(hba); > + /* > + * TODO: Check if we need any delay to make sure that > + * controller is reset > + */ > + ufshcd_set_link_off(hba); > + } > + > +out: > + return ret; > +} > + > +static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) { > + /* > + * If UFS device is either in UFS_Sleep turn off VCC rail to save some > + * power. > + * > + * If UFS device and link is in OFF state, all power supplies (VCC, > + * VCCQ, VCCQ2) can be turned off if power on write protect is not > + * required. If UFS link is inactive (Hibern8 or OFF state) and device > + * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode. > + * > + * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway > + * in low power state which would save some power. > + */ > + if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) && > + !hba->dev_info.is_lu_power_on_wp) { > + ufshcd_setup_vreg(hba, false); > + } else if (!ufshcd_is_ufs_dev_active(hba)) { > + ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false); > + if (!ufshcd_is_link_active(hba)) { > + ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq); > + ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2); > + } > + } > +} > + > +static int ufshcd_vreg_set_hpm(struct ufs_hba *hba) { > + int ret = 0; > + > + if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) && > + !hba->dev_info.is_lu_power_on_wp) { > + ret = ufshcd_setup_vreg(hba, true); > + } else if (!ufshcd_is_ufs_dev_active(hba)) { > + ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true); > + if (!ret && !ufshcd_is_link_active(hba)) { > + ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq); > + if (ret) > + goto vcc_disable; > + ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2); > + if (ret) > + goto vccq_lpm; > + } > + } > + goto out; > + > +vccq_lpm: > + ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq); > +vcc_disable: > + ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false); > +out: > + return ret; > } > -EXPORT_SYMBOL_GPL(ufshcd_suspend); > > /** > - * ufshcd_resume - resume power management function > + * ufshcd_suspend - helper function for suspend operations > * @hba: per adapter instance > + * @pm_op: desired low power operation type > * > - * Returns -ENOSYS > + * This function will try to put the UFS device and link into low power > + * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl" > + * (System PM level). > + * > + * If this function is called during shutdown, it will make sure that > + * both UFS device and UFS link is powered off. > + * > + * NOTE: UFS device & link must be active before we enter in this function. > + * > + * Returns 0 for success and non-zero for failure > */ > -int ufshcd_resume(struct ufs_hba *hba) > +static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) > { > + int ret = 0; > + enum ufs_pm_level pm_lvl; > + enum ufs_dev_pwr_mode req_dev_pwr_mode; > + enum uic_link_state req_link_state; > + > + hba->pm_op_in_progress = 1; > + if (!ufshcd_is_shutdown_pm(pm_op)) { > + pm_lvl = ufshcd_is_runtime_pm(pm_op) ? > + hba->rpm_lvl : hba->spm_lvl; > + req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl); > + req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl); > + } else { > + req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE; > + req_link_state = UIC_LINK_OFF_STATE; > + } > + > + /* > + * If we can't transition into any of the low power modes > + * just gate the clocks. > + */ > + if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE && > + req_link_state == UIC_LINK_ACTIVE_STATE) { > + goto disable_clks; > + } > + > + if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) && > + (req_link_state == hba->uic_link_state)) > + goto out; > + > + /* UFS device & link must be active before we enter in this function */ > + if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) { > + ret = -EINVAL; > + goto out; > + } > + > + if (ufshcd_is_runtime_pm(pm_op)) { > + /* > + * The device is idle with no requests in the queue, > + * allow background operations if needed. > + */ > + ret = ufshcd_bkops_ctrl(hba, BKOPS_STATUS_NON_CRITICAL); > + if (ret) > + goto out; > + } > + > + if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) && > + ((ufshcd_is_runtime_pm(pm_op) && !hba->auto_bkops_enabled) || > + !ufshcd_is_runtime_pm(pm_op))) { > + /* ensure that bkops is disabled */ > + ufshcd_disable_auto_bkops(hba); > + ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode); > + if (ret) > + goto out; > + } > + > + ret = ufshcd_link_state_transition(hba, req_link_state, 1); > + if (ret) > + goto set_dev_active; > + > + ufshcd_vreg_set_lpm(hba); > + > +disable_clks: > + /* > + * Call vendor specific suspend callback. As these callbacks may access > + * vendor specific host controller register space call them before the > + * host clocks are ON. > + */ > + if (hba->vops && hba->vops->suspend) { > + ret = hba->vops->suspend(hba, pm_op); > + if (ret) > + goto set_link_active; > + } > + > + if (hba->vops && hba->vops->setup_clocks) { > + ret = hba->vops->setup_clocks(hba, false); > + if (ret) > + goto vops_resume; > + } > + > + if (!ufshcd_is_link_active(hba)) > + ufshcd_setup_clocks(hba, false); > + else > + /* If link is active, device ref_clk can't be switched off */ > + __ufshcd_setup_clocks(hba, false, true); > + > /* > - * TODO: > - * 1. Set HCE to 1, to start the UFS host controller > - * initialization process > - * 2. Set UTRLRSR and UTMRLRSR bits to 1 > - * 3. Change the internal driver state to operational > - * 4. Unblock SCSI requests from SCSI midlayer > + * Disable the host irq as host controller as there won't be any > + * host controller trasanction expected till resume. > */ > + ufshcd_disable_irq(hba); > + goto out; > > - return -ENOSYS; > +vops_resume: > + if (hba->vops && hba->vops->resume) > + hba->vops->resume(hba, pm_op); > +set_link_active: > + ufshcd_vreg_set_hpm(hba); > + if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba)) > + ufshcd_set_link_active(hba); > + else if (ufshcd_is_link_off(hba)) > + ufshcd_host_reset_and_restore(hba); > +set_dev_active: > + if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE)) > + ufshcd_disable_auto_bkops(hba); > +out: > + hba->pm_op_in_progress = 0; > + return ret; > } > -EXPORT_SYMBOL_GPL(ufshcd_resume); > > -int ufshcd_runtime_suspend(struct ufs_hba *hba) > +/** > + * ufshcd_resume - helper function for resume operations > + * @hba: per adapter instance > + * @pm_op: runtime PM or system PM > + * > + * This function basically brings the UFS device, UniPro link and > +controller > + * to active state. > + * > + * Returns 0 for success and non-zero for failure */ static int > +ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) > { > - if (!hba) > - return 0; > + int ret; > + enum uic_link_state old_link_state; > + > + hba->pm_op_in_progress = 1; > + old_link_state = hba->uic_link_state; > + /* Make sure clocks are enabled before accessing controller */ > + ret = ufshcd_setup_clocks(hba, true); > + if (ret) > + goto out; > + > + if (hba->vops && hba->vops->setup_clocks) { > + ret = hba->vops->setup_clocks(hba, true); > + if (ret) > + goto disable_clks; > + } > + > + /* enable the host irq as host controller would be active soon */ > + ufshcd_enable_irq(hba); > + > + ret = ufshcd_vreg_set_hpm(hba); > + if (ret) > + goto disable_irq_and_vops_clks; > > /* > - * The device is idle with no requests in the queue, > - * allow background operations. > + * Call vendor specific resume callback. As these callbacks may access > + * vendor specific host controller register space call them when the > + * host clocks are ON. > */ > - return ufshcd_enable_auto_bkops(hba); > + if (hba->vops && hba->vops->resume) { > + ret = hba->vops->resume(hba, pm_op); > + if (ret) > + goto disable_vreg; > + } > + > + if (ufshcd_is_link_hibern8(hba)) { > + ret = ufshcd_uic_hibern8_exit(hba); > + if (!ret) > + ufshcd_set_link_active(hba); > + else > + goto vendor_suspend; > + } else if (ufshcd_is_link_off(hba)) { > + ret = ufshcd_host_reset_and_restore(hba); > + /* > + * ufshcd_host_reset_and_restore() should have already > + * set the link state as active > + */ > + if (ret || !ufshcd_is_link_active(hba)) > + goto vendor_suspend; > + } > + > + if (!ufshcd_is_ufs_dev_active(hba)) { > + ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE); > + if (ret) > + goto set_old_link_state; > + } > + > + ufshcd_disable_auto_bkops(hba); > + goto out; > + > +set_old_link_state: > + ufshcd_link_state_transition(hba, old_link_state, 0); > +vendor_suspend: > + if (hba->vops && hba->vops->suspend) > + hba->vops->suspend(hba, pm_op); > +disable_vreg: > + ufshcd_vreg_set_lpm(hba); > +disable_irq_and_vops_clks: > + ufshcd_disable_irq(hba); > + if (hba->vops && hba->vops->setup_clocks) > + ret = hba->vops->setup_clocks(hba, false); > +disable_clks: > + ufshcd_setup_clocks(hba, false); > +out: > + hba->pm_op_in_progress = 0; > + return ret; > +} > + > +/** > + * ufshcd_system_suspend - system suspend routine > + * @hba: per adapter instance > + * @pm_op: runtime PM or system PM > + * > + * Check the description of ufshcd_suspend() function for more details. > + * > + * Returns 0 for success and non-zero for failure */ int > +ufshcd_system_suspend(struct ufs_hba *hba) { > + int ret = 0; > + > + if (!hba || !hba->is_powered) > + goto out; > + > + if (pm_runtime_suspended(hba->dev)) { > + if (hba->rpm_lvl == hba->spm_lvl) > + /* > + * There is possibility that device may still be in > + * active state during the runtime suspend. > + */ > + if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) == > + hba->curr_dev_pwr_mode) > && !hba->auto_bkops_enabled) > + goto out; > + > + /* > + * UFS device and/or UFS link low power states during runtime > + * suspend seems to be different than what is expected during > + * system suspend. Hence runtime resume the devic & link and > + * let the system suspend low power states to take effect. > + * TODO: If resume takes longer time, we might have optimize > + * it in future by not resuming everything if possible. > + */ > + ret = ufshcd_runtime_resume(hba); > + if (ret) > + goto out; > + } > + > + ret = ufshcd_suspend(hba, UFS_SYSTEM_PM); > +out: > + return ret; > +} > +EXPORT_SYMBOL(ufshcd_system_suspend); > + > +/** > + * ufshcd_system_resume - system resume routine > + * @hba: per adapter instance > + * > + * Returns 0 for success and non-zero for failure */ > + > +int ufshcd_system_resume(struct ufs_hba *hba) { > + if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev)) > + /* > + * Let the runtime resume take care of resuming > + * if runtime suspended. > + */ > + return 0; > + else > + return ufshcd_resume(hba, UFS_SYSTEM_PM); } > +EXPORT_SYMBOL(ufshcd_system_resume); > + > +/** > + * ufshcd_runtime_suspend - runtime suspend routine > + * @hba: per adapter instance > + * > + * Check the description of ufshcd_suspend() function for more details. > + * > + * Returns 0 for success and non-zero for failure */ int > +ufshcd_runtime_suspend(struct ufs_hba *hba) { > + if (!hba || !hba->is_powered) > + return 0; > + else > + return ufshcd_suspend(hba, UFS_RUNTIME_PM); > } > EXPORT_SYMBOL(ufshcd_runtime_suspend); > > +/** > + * ufshcd_runtime_resume - runtime resume routine > + * @hba: per adapter instance > + * > + * This function basically brings the UFS device, UniPro link and > +controller > + * to active state. Following operations are done in this function: > + * > + * 1. Turn on all the controller related clocks > + * 2. Bring the UniPro link out of Hibernate state > + * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device > + * to active state. > + * 4. If auto-bkops is enabled on the device, disable it. > + * > + * So following would be the possible power state after this function > +return > + * successfully: > + * S1: UFS device in Active state with VCC rail ON > + * UniPro link in Active state > + * All the UFS/UniPro controller clocks are ON > + * > + * Returns 0 for success and non-zero for failure */ > int ufshcd_runtime_resume(struct ufs_hba *hba) { > - if (!hba) > + if (!hba || !hba->is_powered) > return 0; > - > - return ufshcd_disable_auto_bkops(hba); > + else > + return ufshcd_resume(hba, UFS_RUNTIME_PM); > } > EXPORT_SYMBOL(ufshcd_runtime_resume); > > @@ -3900,6 +4600,36 @@ int ufshcd_runtime_idle(struct ufs_hba *hba) > EXPORT_SYMBOL(ufshcd_runtime_idle); > > /** > + * ufshcd_shutdown - shutdown routine > + * @hba: per adapter instance > + * > + * This function would power off both UFS device and UFS link. > + * > + * Returns 0 always to allow force shutdown even in case of errors. > + */ > +int ufshcd_shutdown(struct ufs_hba *hba) { > + int ret = 0; > + > + if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba)) > + goto out; > + > + if (pm_runtime_suspended(hba->dev)) { > + ret = ufshcd_runtime_resume(hba); > + if (ret) > + goto out; > + } > + > + ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM); > +out: > + if (ret) > + dev_err(hba->dev, "%s failed, err %d\n", __func__, ret); > + /* allow force shutdown even in case of errors */ > + return 0; > +} > +EXPORT_SYMBOL(ufshcd_shutdown); > + > +/** > * ufshcd_remove - de-allocate SCSI host and host memory space > * data structure memory > * @hba - per adapter instance > @@ -4052,6 +4782,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem > *mmio_base, unsigned int irq) > if (err) { > dev_err(hba->dev, "request irq failed\n"); > goto out_disable; > + } else { > + hba->is_irq_enabled = true; > } > > /* Enable SCSI tag mapping */ > @@ -4077,6 +4809,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem > *mmio_base, unsigned int irq) > /* Hold auto suspend until async scan completes */ > pm_runtime_get_sync(dev); > > + /* > + * The device-initialize-sequence hasn't been invoked yet. > + * Set the device to power-off state > + */ > + ufshcd_set_ufs_dev_poweroff(hba); > + > async_schedule(ufshcd_async_scan, hba); > > return 0; > @@ -4084,6 +4822,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem > *mmio_base, unsigned int irq) > out_remove_scsi_host: > scsi_remove_host(hba->host); > out_disable: > + hba->is_irq_enabled = false; > scsi_host_put(host); > ufshcd_hba_exit(hba); > out_error: > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index > 9b5f77f..1ee429d 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -96,6 +96,54 @@ struct uic_command { > struct completion done; > }; > > +/* Used to differentiate the power management options */ enum ufs_pm_op > +{ > + UFS_RUNTIME_PM, > + UFS_SYSTEM_PM, > + UFS_SHUTDOWN_PM, > +}; > + > +#define ufshcd_is_runtime_pm(op) ((op) == UFS_RUNTIME_PM) #define > +ufshcd_is_system_pm(op) ((op) == UFS_SYSTEM_PM) #define > +ufshcd_is_shutdown_pm(op) ((op) == UFS_SHUTDOWN_PM) > + > +/* Host <-> Device UniPro Link state */ enum uic_link_state { > + UIC_LINK_OFF_STATE = 0, /* Link powered down or disabled */ > + UIC_LINK_ACTIVE_STATE = 1, /* Link is in Fast/Slow/Sleep state */ > + UIC_LINK_HIBERN8_STATE = 2, /* Link is in Hibernate state */ > +}; > + > +#define ufshcd_is_link_off(hba) ((hba)->uic_link_state == > +UIC_LINK_OFF_STATE) #define ufshcd_is_link_active(hba) > ((hba)->uic_link_state == \ > + UIC_LINK_ACTIVE_STATE) > +#define ufshcd_is_link_hibern8(hba) ((hba)->uic_link_state == \ > + UIC_LINK_HIBERN8_STATE) > +#define ufshcd_set_link_off(hba) ((hba)->uic_link_state = > +UIC_LINK_OFF_STATE) #define ufshcd_set_link_active(hba) > ((hba)->uic_link_state = \ > + UIC_LINK_ACTIVE_STATE) > +#define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \ > + UIC_LINK_HIBERN8_STATE) > + > +/* > + * UFS Power management levels. > + * Each level is in increasing order of power savings. > + */ > +enum ufs_pm_level { > + UFS_PM_LVL_0, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE > */ > + UFS_PM_LVL_1, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE > */ > + UFS_PM_LVL_2, /* UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE */ > + UFS_PM_LVL_3, /* UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE > */ > + UFS_PM_LVL_4, /* UFS_POWERDOWN_PWR_MODE, > UIC_LINK_HIBERN8_STATE */ > + UFS_PM_LVL_5, /* UFS_POWERDOWN_PWR_MODE, > UIC_LINK_OFF_STATE */ > + UFS_PM_LVL_MAX > +}; > + > +struct ufs_pm_lvl_states { > + enum ufs_dev_pwr_mode dev_state; > + enum uic_link_state link_state; > +}; > + > /** > * struct ufshcd_lrb - local reference block > * @utr_descriptor_ptr: UTRD address of the command @@ -184,6 +232,8 > @@ struct ufs_clk_info { > * variant specific Uni-Pro initialization. > * @link_startup_notify: called before and after Link startup is carried out > * to allow variant specific Uni-Pro initialization. > + * @suspend: called during host controller PM callback > + * @resume: called during host controller PM callback > */ > struct ufs_hba_variant_ops { > const char *name; > @@ -193,6 +243,8 @@ struct ufs_hba_variant_ops { > int (*setup_regulators)(struct ufs_hba *, bool); > int (*hce_enable_notify)(struct ufs_hba *, bool); > int (*link_startup_notify)(struct ufs_hba *, bool); > + int (*suspend)(struct ufs_hba *, enum ufs_pm_op); > + int (*resume)(struct ufs_hba *, enum ufs_pm_op); > }; > > /** > @@ -271,6 +323,13 @@ struct ufs_hba { > * "UFS device" W-LU. > */ > struct scsi_device *sdev_ufs_device; > + enum ufs_dev_pwr_mode curr_dev_pwr_mode; > + enum uic_link_state uic_link_state; > + /* Desired UFS power management level during runtime PM */ > + enum ufs_pm_level rpm_lvl; > + /* Desired UFS power management level during system PM */ > + enum ufs_pm_level spm_lvl; > + int pm_op_in_progress; > > struct ufshcd_lrb *lrb; > unsigned long lrb_in_use; > @@ -285,16 +344,17 @@ struct ufs_hba { > struct ufs_hba_variant_ops *vops; > void *priv; > unsigned int irq; > + bool is_irq_enabled; > > - struct uic_command *active_uic_cmd; > - struct mutex uic_cmd_mutex; > > wait_queue_head_t tm_wq; > wait_queue_head_t tm_tag_wq; > unsigned long tm_condition; > unsigned long tm_slots_in_use; > > - struct completion *pwr_done; > + struct uic_command *active_uic_cmd; > + struct mutex uic_cmd_mutex; > + struct completion *uic_async_done; > > u32 ufshcd_state; > u32 eh_flags; > @@ -317,9 +377,13 @@ struct ufs_hba { > /* Device management request data */ > struct ufs_dev_cmd dev_cmd; > > + /* Keeps information of the UFS device connected to this host */ > + struct ufs_dev_info dev_info; > bool auto_bkops_enabled; > struct ufs_vreg_info vreg_info; > struct list_head clk_list_head; > + > + bool wlun_dev_clr_ua; > }; > > #define ufshcd_writel(hba, val, reg) \ > @@ -346,11 +410,12 @@ static inline void check_upiu_size(void) > GENERAL_UPIU_REQUEST_SIZE + QUERY_DESC_MAX_SIZE); } > > -extern int ufshcd_suspend(struct ufs_hba *hba, pm_message_t state); > -extern int ufshcd_resume(struct ufs_hba *hba); extern int > ufshcd_runtime_suspend(struct ufs_hba *hba); extern int > ufshcd_runtime_resume(struct ufs_hba *hba); extern int > ufshcd_runtime_idle(struct ufs_hba *hba); > +extern int ufshcd_system_suspend(struct ufs_hba *hba); extern int > +ufshcd_system_resume(struct ufs_hba *hba); extern int > +ufshcd_shutdown(struct ufs_hba *hba); > extern int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel, > u8 attr_set, u32 mib_val, u8 peer); extern int > ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel, diff --git > a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index e1b844b..d572119 > 100644 > --- a/drivers/scsi/ufs/ufshci.h > +++ b/drivers/scsi/ufs/ufshci.h > @@ -124,8 +124,11 @@ enum { > #define CONTROLLER_FATAL_ERROR UFS_BIT(16) > #define SYSTEM_BUS_FATAL_ERROR UFS_BIT(17) > > -#define UFSHCD_UIC_MASK (UIC_COMMAND_COMPL |\ > - UIC_POWER_MODE) > +#define UFSHCD_UIC_PWR_MASK (UIC_HIBERNATE_ENTER |\ > + UIC_HIBERNATE_EXIT |\ > + UIC_POWER_MODE) > + > +#define UFSHCD_UIC_MASK (UIC_COMMAND_COMPL | > UFSHCD_UIC_PWR_MASK) > > #define UFSHCD_ERROR_MASK (UIC_ERROR |\ > DEVICE_FATAL_ERROR |\ > @@ -210,7 +213,7 @@ enum { > #define UIC_GET_ATTR_ID(v) (((v) >> 16) & 0xFFFF) > > /* UIC Commands */ > -enum { > +enum uic_cmd_dme { > UIC_CMD_DME_GET = 0x01, > UIC_CMD_DME_SET = 0x02, > UIC_CMD_DME_PEER_GET = 0x03, > -- > 1.8.5.2 > -- > QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a > member of Code Aurora Forum, hosted by The Linux Foundation > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body > of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
