linux-kernel - [PATCH] scsi: ufs: Disable autohibern8 feature in Cadence UFS

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Date:   Tue, 3 Dec 2019 11:07:15 +0100
From:   sheebab <sheebab@...ence.com>
To:     <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <pedrom.sousa@...opsys.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <stanley.chu@...iatek.com>,
        <beanhuo@...ron.com>, <yuehaibing@...wei.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vigneshr@...com>
CC:     <mparab@...ence.com>, <rafalc@...ence.com>,
        sheebab <sheebab@...ence.com>
Subject: [PATCH] scsi: ufs: Disable autohibern8 feature in Cadence UFS

This patch disables autohibern8 feature in Cadence UFS. 
The autohibern8 feature has issues due to which unexpected interrupt
trigger is happening. After the interrupt issue is sorted out autohibern8
feature will be re-enabled

Signed-off-by: sheebab <sheebab@...ence.com>
---
 drivers/scsi/ufs/cdns-pltfrm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index b2af04c57a39..882425d1166b 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -98,6 +98,12 @@ static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
 	 * completed.
 	 */
 	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
+
+	/*
+	 * Disabling Autohibern8 feature in cadence UFS
+	 * to mask unexpected interrupt trigger.
+	 */
+	hba->ahit = 0;
 
 	return 0;
 }
-- 
2.17.1