linux-kernel - [PATCH v5 7/7] scsi: ufs: Keep device active mode only fWriteBoosterBufferFlushDuringHibernate == 1

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Date:   Wed, 16 Dec 2020 00:05:19 +0100
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 7/7] scsi: ufs: Keep device active mode only fWriteBoosterBufferFlushDuringHibernate == 1

From: Bean Huo <beanhuo@...ron.com>

According to the JEDEC UFS 3.1 Spec, If fWriteBoosterBufferFlushDuringHibernate
is set to one, the device flushes the WriteBooster Buffer data automatically
whenever the link enters the hibernate (HIBERN8) state. While the flushing
operation is in progress, the device should be kept in Active power mode.
Currently, we set this flag during the UFSHCD probe stage, but we didn't deal
with its programming failure. Even this failure is less likely to occur, but
still it is possible.
This patch is to add checkup of fWriteBoosterBufferFlushDuringHibernate setting,
keep the device as "active power mode" only when this flag be successfully set
to 1.

Fixes: 51dd905bd2f6 ("scsi: ufs: Fix WriteBooster flush during runtime suspend")
Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufs.h    |  1 +
 drivers/scsi/ufs/ufshcd.c | 21 ++++++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index ec74cf360b1f..506ae8fab558 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -541,6 +541,7 @@ struct ufs_dev_info {
 	/* UFS WB related flags */
 	bool    wb_enabled;
 	bool    wb_buf_flush_enabled;
+	bool    wb_buf_flush_in_hibern8;
 	u8	wb_dedicated_lu;
 	u8      wb_buffer_type;
 
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ba8298f0d017..3d9e6f5a7ffe 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -282,10 +282,16 @@ static inline void ufshcd_wb_config(struct ufs_hba *hba)
 		dev_err(hba->dev, "%s: Enable WB failed: %d\n", __func__, ret);
 	else
 		dev_info(hba->dev, "%s: Write Booster Configured\n", __func__);
+
 	ret = ufshcd_wb_toggle_flush_during_h8(hba, true);
-	if (ret)
+	if (ret) {
 		dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
 			__func__, ret);
+		hba->dev_info.wb_buf_flush_in_hibern8 = false;
+	} else {
+		hba->dev_info.wb_buf_flush_in_hibern8 = true;
+	}
+
 	ufshcd_wb_toggle_flush(hba, true);
 }
 
@@ -589,6 +595,7 @@ static void ufshcd_device_reset(struct ufs_hba *hba)
 		if (ufshcd_is_wb_allowed(hba)) {
 			hba->dev_info.wb_enabled = false;
 			hba->dev_info.wb_buf_flush_enabled = false;
+			hba->dev_info.wb_buf_flush_in_hibern8 = false;
 		}
 	}
 	if (err != -EOPNOTSUPP)
@@ -5468,6 +5475,7 @@ static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
 
 	if (!ufshcd_is_wb_allowed(hba))
 		return false;
+
 	/*
 	 * The ufs device needs the vcc to be ON to flush.
 	 * With user-space reduction enabled, it's enough to enable flush
@@ -8567,6 +8575,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	enum ufs_pm_level pm_lvl;
 	enum ufs_dev_pwr_mode req_dev_pwr_mode;
 	enum uic_link_state req_link_state;
+	bool hibern8;
 
 	hba->pm_op_in_progress = 1;
 	if (!ufshcd_is_shutdown_pm(pm_op)) {
@@ -8626,11 +8635,13 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		 * Hibern8, keep device power mode as "active power mode"
 		 * and VCC supply.
 		 */
+		hibern8 = req_link_state == UIC_LINK_HIBERN8_STATE ||
+			(req_link_state == UIC_LINK_ACTIVE_STATE &&
+			 ufshcd_is_auto_hibern8_enabled(hba));
+
 		hba->dev_info.b_rpm_dev_flush_capable =
-			hba->auto_bkops_enabled ||
-			(((req_link_state == UIC_LINK_HIBERN8_STATE) ||
-			((req_link_state == UIC_LINK_ACTIVE_STATE) &&
-			ufshcd_is_auto_hibern8_enabled(hba))) &&
+			hba->auto_bkops_enabled || (hibern8 &&
+			hba->dev_info.wb_buf_flush_in_hibern8 &&
 			ufshcd_wb_need_flush(hba));
 	}
 
-- 
2.17.1