[PATCH v2 4/6] scsi: ufs: export ufshcd_auto_hibern8_update for vendor usage

[Stanley Chu <stanley.chu@xxxxxxxxxxxx>]

Export ufshcd_auto_hibern8_update to allow vendors to use common
interface to customize auto-hibernate timer.

Cc: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Cc: Avri Altman <avri.altman@xxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Bean Huo <beanhuo@xxxxxxxxxx>
Cc: Can Guo <cang@xxxxxxxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Reviewed-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
---
 drivers/scsi/ufs/ufs-sysfs.c | 20 --------------------
 drivers/scsi/ufs/ufshcd.c    | 18 ++++++++++++++++++
 drivers/scsi/ufs/ufshcd.h    |  1 +
 3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index ad2abc96c0f1..720be3f64be7 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -118,26 +118,6 @@ static ssize_t spm_target_link_state_show(struct device *dev,
 				ufs_pm_lvl_states[hba->spm_lvl].link_state));
 }
 
-static void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
-{
-	unsigned long flags;
-
-	if (!ufshcd_is_auto_hibern8_supported(hba))
-		return;
-
-	spin_lock_irqsave(hba->host->host_lock, flags);
-	if (hba->ahit != ahit)
-		hba->ahit = ahit;
-	spin_unlock_irqrestore(hba->host->host_lock, flags);
-	if (!pm_runtime_suspended(hba->dev)) {
-		pm_runtime_get_sync(hba->dev);
-		ufshcd_hold(hba, false);
-		ufshcd_auto_hibern8_enable(hba);
-		ufshcd_release(hba);
-		pm_runtime_put(hba->dev);
-	}
-}
-
 /* Convert Auto-Hibernate Idle Timer register value to microseconds */
 static int ufshcd_ahit_to_us(u32 ahit)
 {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a6936bebb513..ed02a704c1c2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3893,6 +3893,24 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
 	return ret;
 }
 
+void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
+{
+	unsigned long flags;
+
+	if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
+		return;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->ahit == ahit)
+		goto out_unlock;
+	hba->ahit = ahit;
+	if (!pm_runtime_suspended(hba->dev))
+		ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
+out_unlock:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
+
 void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
 {
 	unsigned long flags;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index b536a26d665e..e05cafddc87b 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -923,6 +923,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
 	enum flag_idn idn, bool *flag_res);
 
 void ufshcd_auto_hibern8_enable(struct ufs_hba *hba);
+void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
 
 #define SD_ASCII_STD true
 #define SD_RAW false
-- 
2.18.0