linux-kernel - [PATCH v7 4/6] scsi: ufs: Remove two WB related fields from struct ufs_dev

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Date:   Tue, 19 Jan 2021 17:38:45 +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 v7 4/6] scsi: ufs: Remove two WB related fields from struct ufs_dev_info

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

d_wb_alloc_units and d_ext_ufs_feature_sup only be used while WB probe.
They are just used to confirm the condition that "if bWriteBoosterBufferType
is set to 01h but dNumSharedWriteBoosterBufferAllocUnits is set to zero,
the WriteBooster feature is disabled", and if UFS device supports WB.
After that, no user uses them any more. So, don't need to keep time in
runtime.

Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufs.h    |  2 --
 drivers/scsi/ufs/ufshcd.c | 14 ++++++--------
 2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 09c7cc8a678d..a8000ed0017e 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -538,9 +538,7 @@ struct ufs_dev_info {
 	u8 *model;
 	u16 wspecversion;
 	u32 clk_gating_wait_us;
-	u32 d_ext_ufs_feature_sup;
 	u8 b_wb_buffer_type;
-	u32 d_wb_alloc_units;
 	bool b_rpm_dev_flush_capable;
 	u8 b_presrv_uspc_en;
 };
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index d13c6eb2efcd..f6fe14b60eff 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7270,6 +7270,7 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
 	struct ufs_dev_info *dev_info = &hba->dev_info;
 	u8 lun;
 	u32 d_lu_wb_buf_alloc;
+	u32 ext_ufs_feature;
 
 	if (!ufshcd_is_wb_allowed(hba))
 		return;
@@ -7287,11 +7288,10 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
 	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
 		goto wb_disabled;
 
-	dev_info->d_ext_ufs_feature_sup =
-		get_unaligned_be32(desc_buf +
-				   DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+	ext_ufs_feature = get_unaligned_be32(desc_buf +
+					DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
 
-	if (!(dev_info->d_ext_ufs_feature_sup & UFS_DEV_WRITE_BOOSTER_SUP))
+	if (!(ext_ufs_feature & UFS_DEV_WRITE_BOOSTER_SUP))
 		goto wb_disabled;
 
 	/*
@@ -7306,10 +7306,8 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
 		desc_buf[DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN];
 
 	if (dev_info->b_wb_buffer_type == WB_BUF_MODE_SHARED) {
-		dev_info->d_wb_alloc_units =
-		get_unaligned_be32(desc_buf +
-				   DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS);
-		if (!dev_info->d_wb_alloc_units)
+		if (!get_unaligned_be32(desc_buf +
+				   DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS))
 			goto wb_disabled;
 	} else {
 		for (lun = 0; lun < UFS_UPIU_MAX_WB_LUN_ID; lun++) {
-- 
2.17.1