[PATCH v1] ufs: core: wlun suspend SSU fail recovery

[peter.wang at mediatek.com]

From: Peter Wang <peter.wang at mediatek.com>

When SSU fail in wlun suspend flow, trigger error handlder and
return busy to break the suspend.
If not, wlun runtime pm status become error and the consumer will
stuck in runtime suspend status.

Signed-off-by: Peter Wang <peter.wang at mediatek.com>
---
 drivers/ufs/core/ufshcd.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index b1f59a5fe632..2f2d3d5d8684 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8970,6 +8970,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	enum ufs_pm_level pm_lvl;
 	enum ufs_dev_pwr_mode req_dev_pwr_mode;
 	enum uic_link_state req_link_state;
+	unsigned long flags;
 
 	hba->pm_op_in_progress = true;
 	if (pm_op != UFS_SHUTDOWN_PM) {
@@ -9049,8 +9050,21 @@ 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)
+			if (ret) {
+				/*
+				 * If retrun err in suspend flow, IO will hang.
+				 * Trigger error handler and break suspend for
+				 * error recovery.
+				 */
+				spin_lock_irqsave(hba->host->host_lock, flags);
+				hba->force_reset = true;
+				ufshcd_schedule_eh_work(hba);
+				spin_unlock_irqrestore(hba->host->host_lock,
+					flags);
+
+				ret = -EBUSY;
 				goto enable_scaling;
+			}
 		}
 	}
 
-- 
2.18.0