[PATCH v2 02/10] ufs: host: mediatek: Enhance recovery on resume failure

[peter.wang at mediatek.com]

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

This patch improves the recovery process when a resume operation
fails. If both the resume and recovery fail, it logs the device's
power status and returns 0 to prevent I/O hang..

Signed-off-by: Peter Wang <peter.wang at mediatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 1aa14a8dc161..6d25110c8cb8 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1775,8 +1775,21 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	}
 
 	return 0;
+
 fail:
-	return ufshcd_link_recovery(hba);
+	/*
+	 * Check if the platform (parent) device has resumed, and ensure that
+	 * power, clock, and MTCMOS are all turned on.
+	 */
+	err = ufshcd_link_recovery(hba);
+	if (err) {
+		dev_err(hba->dev, "Device PM: req=%d, status:%d, err:%d\n",
+			hba->dev->power.request,
+			hba->dev->power.runtime_status,
+			hba->dev->power.runtime_error);
+	}
+
+	return 0; /* Cannot return a failure, otherwise, the I/O will hang. */
 }
 
 static void ufs_mtk_dbg_register_dump(struct ufs_hba *hba)
-- 
2.45.2