From: Peter Wang peter.wang@mediatek.com
When SSU/enter hibern8 fail in wlun suspend flow, trigger error handler and return busy to break the suspend. If not, wlun runtime pm status become error and the consumer will stuck in runtime suspend status.
Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun") Cc: stable@vger.kernel.org Signed-off-by: Peter Wang peter.wang@mediatek.com --- drivers/ufs/core/ufshcd.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index b1f59a5fe632..c91d58d1486a 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -106,6 +106,13 @@ 16, 4, buf, __len, false); \ } while (0)
+#define ufshcd_force_error_recovery(hba) do { \ + spin_lock_irq(hba->host->host_lock); \ + hba->force_reset = true; \ + ufshcd_schedule_eh_work(hba); \ + spin_unlock_irq(hba->host->host_lock); \ +} while (0) + int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len, const char *prefix) { @@ -9049,6 +9056,15 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (!hba->dev_info.b_rpm_dev_flush_capable) { ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode); + if (ret && pm_op != UFS_SHUTDOWN_PM) { + /* + * If return err in suspend flow, IO will hang. + * Trigger error handler and break suspend for + * error recovery. + */ + ufshcd_force_error_recovery(hba); + ret = -EBUSY; + } if (ret) goto enable_scaling; } @@ -9060,6 +9076,15 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) */ check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba); ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops); + if (ret && pm_op != UFS_SHUTDOWN_PM) { + /* + * If return err in suspend flow, IO will hang. + * Trigger error handler and break suspend for + * error recovery. + */ + ufshcd_force_error_recovery(hba); + ret = -EBUSY; + } if (ret) goto set_dev_active;