linux-kernel - [PATCH v1 3/9] scsi: ufs: Override auto suspend tunables for ufs

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Date:   Fri,  6 Jul 2018 18:00:30 +0530
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     subhashj@...eaurora.org, cang@...eaurora.org,
        vivek.gautam@...eaurora.org, rnayak@...eaurora.org,
        vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org
Cc:     Sujit Reddy Thumma <sthumma@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Gilad Broner <gbroner@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 3/9] scsi: ufs: Override auto suspend tunables for ufs

From: Sujit Reddy Thumma <sthumma@...eaurora.org>

Override auto suspend tunables for UFS device LUNs during
initialization so as to efficiently manage background operations
and the power consumption.

Signed-off-by: Sujit Reddy Thumma <sthumma@...eaurora.org>
Signed-off-by: Gilad Broner <gbroner@...eaurora.org>
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 77e2b3e..b03f3ea 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -89,6 +89,9 @@
 /* Interrupt aggregation default timeout, unit: 40us */
 #define INT_AGGR_DEF_TO	0x02
 
+/* default value of auto suspend is 3 seconds */
+#define UFSHCD_AUTO_SUSPEND_DELAY_MS 3000 /* millisecs */
+
 #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
 	({                                                              \
 		int _ret;                                               \
@@ -4528,6 +4531,9 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
 	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
 	blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
 
+	sdev->autosuspend_delay = UFSHCD_AUTO_SUSPEND_DELAY_MS;
+	sdev->use_rpm_auto = 1;
+
 	return 0;
 }
 
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.