On 2020-11-10 16:55, Yang Yang wrote:
During system resume, ufshcd_system_resume() won't resume UFS host if runtime suspended. After that, scsi_bus_resume() try to set SCSI host's RPM status to RPM_ACTIVE, this will fail because UFS host's RPM status is still RPM_SUSPENDED. So fix it. scsi host0: scsi_runtime_suspend() ufshcd_runtime_suspend() scsi host0: scsi_bus_suspend() ufshcd_system_suspend() ---------------------------------- ufshcd_pltfrm_resume() scsi host0: scsi_bus_resume() scsi host0: scsi_bus_resume_common() scsi host0: pm_runtime_set_active(dev)scsi host0: runtime PM trying to activate child device host0 but parent(8800000.ufshc) is not active Fixes: 57d104c153d3 ("ufs: add UFS power management support") Signed-off-by: Yang Yang <yang.yang@xxxxxxxx> --- drivers/scsi/ufs/ufshcd.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index b8f573a02713..9e666e1ad58c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -8767,11 +8767,7 @@ int ufshcd_system_resume(struct ufs_hba *hba) if (!hba) return -EINVAL; - if (!hba->is_powered || pm_runtime_suspended(hba->dev)) - /* - * Let the runtime resume take care of resuming - * if runtime suspended. - */ + if (!hba->is_powered) goto out; else ret = ufshcd_resume(hba, UFS_SYSTEM_PM); @@ -8779,8 +8775,15 @@ int ufshcd_system_resume(struct ufs_hba *hba) trace_ufshcd_system_resume(dev_name(hba->dev), ret, ktime_to_us(ktime_sub(ktime_get(), start)), hba->curr_dev_pwr_mode, hba->uic_link_state); - if (!ret) + if (!ret) { hba->is_sys_suspended = false; + + if (pm_runtime_suspended(hba->dev)) { + pm_runtime_disable(hba->dev); + pm_runtime_set_active(hba->dev); + pm_runtime_enable(hba->dev); + } + } return ret; } EXPORT_SYMBOL(ufshcd_system_resume);
It is designed like this - if hba is runtime suspend, do not resume it during system resume, which is the so called deferred resume feature. This is to leave the runtime PM management to block layer PM, which is more power efficiency.
scsi host0: runtime PM trying to activate child device host0 but parent (8800000.ufshc) is not active
The log is not harmful or fatal, maybe just annoying. Do you see real problem with it? If yes, please share it here. Thanks, Can Guo.
