linux-kernel - [PATCH v1 1/1] scsi: ufs: Keep UFS regulators on when autobkops enabled

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Message-Id: <6fd8e4d88eb331c9f04c74a3581593961f2caf73.1603747748.git.asutoshd@codeaurora.org>
Date:   Mon, 26 Oct 2020 14:31:10 -0700
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     cang@...eaurora.org, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org
Cc:     "Bao D. Nguyen" <nguyenb@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Asutosh Das <asutoshd@...eaurora.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 1/1] scsi: ufs: Keep UFS regulators on when autobkops enabled

From: "Bao D. Nguyen" <nguyenb@...eaurora.org>

When bkops is enabled, the UFS device may do bkops during suspend.
With bkops enabled during suspend, keep the regulators
in active operation configuration, allowing the device to draw
high power to support bkops and avoid over current event.

Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 47c544d..a94543c 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8523,7 +8523,9 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	if (ret)
 		goto set_dev_active;
 
-	ufshcd_vreg_set_lpm(hba);
+	/* Device may perform bkops if autobkops is enabled */
+	if (!hba->auto_bkops_enabled)
+		ufshcd_vreg_set_lpm(hba);
 
 disable_clks:
 	/*
-- 
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