linux-kernel - [PATCH v1] scsi: ufs: disable auto hibern8 while entering suspend

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Date:   Mon, 24 Jan 2022 08:40:44 +0900
From:   SEO HOYOUNG <hy50.seo@...sung.com>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        alim.akhtar@...sung.com, avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, beanhuo@...ron.com,
        asutoshd@...eaurora.org, cang@...eaurora.org, bvanassche@....org
Cc:     SEO HOYOUNG <hy50.seo@...sung.com>
Subject: [PATCH v1] scsi: ufs: disable auto hibern8 while entering suspend

If using auto hibern8 mode, need to disable auto hibern8 while
entering suspend.
When using auto hibern8 mode, it does not seem right to send a uic command
for entry into hibern8 in the next line(ufshcd_lik_state_transition(..))
It seem right to send after disable auto hibern8.

In addition, if the auto hibern8 mode supported, it is enabled in resume.
So it seems that it will be paired only when auto hibern8 is disabled
while entering suspend.

Signed-off-by: SEO HOYOUNG <hy50.seo@...sung.com>
---
 drivers/scsi/ufs/ufshcd.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 460d2b440d2e..f6b16e229ad3 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4204,6 +4204,18 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
 }
 EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
 
+void ufshcd_auto_hibern8_disable(struct ufs_hba *hba)
+{
+	unsigned long flags;
+
+	if (!ufshcd_is_auto_hibern8_supported(hba))
+		return;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	ufshcd_writel(hba, 0, REG_AUTO_HIBERNATE_IDLE_TIMER);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
 void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
 {
 	unsigned long flags;
@@ -8925,6 +8937,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	 * with the link off, so do not check for bkops.
 	 */
 	check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
+	ufshcd_auto_hibern8_disable(hba);
 	ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
 	if (ret)
 		goto set_dev_active;
-- 
2.26.0