From f3099fbd9b90f94849bd155ebf690dd5a8cfa477 Mon Sep 17 00:00:00 2001 From: Yaniv Gardi Date: Thu, 10 Mar 2016 17:37:17 +0200 Subject: [PATCH] scsi: ufs: fix leakage during link off state Currently when we try to put the link in off/disabled state during suspend, it seems link is not being kept in low power mode. This patch fixes the issue by putting the link in hibern8 first (so device also puts the link in low power mode) and then stop the host controller. Reviewed-by: Hannes Reinecke Signed-off-by: Subhash Jadavani Signed-off-by: Yaniv Gardi Signed-off-by: Martin K. Petersen --- drivers/scsi/ufs/ufshcd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 305210fda370..93cc02f2d48e 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5687,6 +5687,16 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, else if ((req_link_state == UIC_LINK_OFF_STATE) && (!check_for_bkops || (check_for_bkops && !hba->auto_bkops_enabled))) { + /* + * Let's make sure that link is in low power mode, we are doing + * this currently by putting the link in Hibern8. Otherway to + * put the link in low power mode is to send the DME end point + * to device and then send the DME reset command to local + * unipro. But putting the link in hibern8 is much faster. + */ + ret = ufshcd_uic_hibern8_enter(hba); + if (ret) + goto out; /* * Change controller state to "reset state" which * should also put the link in off/reset state -- 2.20.1