android-mainline/FROMGIT-scsi-ufs-override-auto-suspend-tunables-for-ufs.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Stanley Chu <stanley.chu@mediatek.com>
Date: Mon, 16 Sep 2019 23:56:50 +0800
Subject: FROMGIT: scsi: ufs: override auto suspend tunables for ufs

Rework from previous work by:
Sujit Reddy Thumma <sthumma@codeaurora.org>

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

Link: https://lore.kernel.org/r/1568649411-5127-3-git-send-email-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Bug: 140620770
(cherry pick from 49615ba144a0929c725d08f0d3ba8494c8b77404
 https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git misc)
Change-Id: I35bc8d52c73db5d9e6936c5fbfb728b5436fcf1f
Signed-off-by: Todd Kjos <tkjos@google.com>
---
 drivers/scsi/ufs/ufshcd.c |  7 +++++++
 drivers/scsi/ufs/ufshcd.h | 10 ++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 126af87ab6d3..8083fe1645ce 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 delay of autosuspend: 2000 ms */
+#define RPM_AUTOSUSPEND_DELAY_MS 2000
+
 #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
 	({                                                              \
 		int _ret;                                               \
@@ -4668,6 +4671,9 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
 
 	ufshcd_crypto_setup_rq_keyslot_manager(hba, q);
 
+	if (ufshcd_is_rpm_autosuspend_allowed(hba))
+		sdev->rpm_autosuspend = 1;
+
 	return 0;
 }
 
@@ -7109,6 +7115,7 @@ static struct scsi_host_template ufshcd_driver_template = {
 	.track_queue_depth	= 1,
 	.sdev_groups		= ufshcd_driver_groups,
 	.dma_boundary		= PAGE_SIZE - 1,
+	.rpm_autosuspend_delay	= RPM_AUTOSUSPEND_DELAY_MS,
 };
 
 static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index b724a6cfe5af..10bac3241c5a 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -755,6 +755,12 @@ struct ufs_hba {
 	 * inline crypto engine, if it is present
 	 */
 #define UFSHCD_CAP_CRYPTO (1 << 6)
+	/*
+	 * This capability allows host controller driver to automatically
+	 * enable runtime power management by itself instead of waiting
+	 * for userspace to control the power management.
+	 */
+#define UFSHCD_CAP_RPM_AUTOSUSPEND (1 << 6)
 
 	struct devfreq *devfreq;
 	struct ufs_clk_scaling clk_scaling;
@@ -797,6 +803,10 @@ static inline bool ufshcd_can_autobkops_during_suspend(struct ufs_hba *hba)
 {
 	return hba->caps & UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
 }
+static inline bool ufshcd_is_rpm_autosuspend_allowed(struct ufs_hba *hba)
+{
+	return hba->caps & UFSHCD_CAP_RPM_AUTOSUSPEND;
+}
 
 static inline bool ufshcd_is_intr_aggr_allowed(struct ufs_hba *hba)
 {