scsi: ufs: core: Tidy up WB configuration code

There are similar code implementations for WB configuration in
ufshcd_wb_{ctrl, toggle_flush_during_h8, toggle_flush}. Extract the common
parts to create a new helper with a flag parameter to reduce code
duplication.

Meanwhile, rename ufshcd_wb_ctrl() to ufshcd_wb_toggle() for better
readability. And remove unnecessary log messages from ufshcd_wb_config()
since relevant toggle function will emit messages. Also change
ufshcd_wb_toggle_flush{__during_h8} to void type accordingly.

Link: https://lore.kernel.org/r/20210318095536.2048-1-zbestahu@gmail.comReviewed-by: NAvri Altman <avri.altman@wdc.com>
Signed-off-by: NYue Hu <huyue2@yulong.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufs-sysfs.c

@@ -246,7 +246,7 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
 	}
 
 	pm_runtime_get_sync(hba->dev);
-	res = ufshcd_wb_ctrl(hba, wb_enable);
+	res = ufshcd_wb_toggle(hba, wb_enable);
 	pm_runtime_put_sync(hba->dev);
 out:
 	up(&hba->host_sem);

drivers/scsi/ufs/ufshcd.c

@@ -246,8 +246,8 @@ static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
 static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
 					 struct ufs_vreg *vreg);
 static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
-static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
-static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
+static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
+static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
 static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
 static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);
 
@@ -274,20 +274,12 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba)
 
 static inline void ufshcd_wb_config(struct ufs_hba *hba)
 {
-	int ret;
-
 	if (!ufshcd_is_wb_allowed(hba))
 		return;
 
-	ret = ufshcd_wb_ctrl(hba, true);
-	if (ret)
-		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)
-		dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
-			__func__, ret);
+	ufshcd_wb_toggle(hba, true);
+
+	ufshcd_wb_toggle_flush_during_h8(hba, true);
 	if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
 		ufshcd_wb_toggle_flush(hba, true);
 }
@@ -1267,7 +1259,7 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
 	/* Enable Write Booster if we have scaled up else disable it */
 	downgrade_write(&hba->clk_scaling_lock);
 	is_writelock = false;
-	ufshcd_wb_ctrl(hba, scale_up);
+	ufshcd_wb_toggle(hba, scale_up);
 
 out_unprepare:
 	ufshcd_clock_scaling_unprepare(hba, is_writelock);
@@ -5443,85 +5435,74 @@ static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
 				__func__, err);
 }
 
-int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable)
+static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn idn)
 {
-	int ret;
 	u8 index;
-	enum query_opcode opcode;
+	enum query_opcode opcode = set ? UPIU_QUERY_OPCODE_SET_FLAG :
+				   UPIU_QUERY_OPCODE_CLEAR_FLAG;
+
+	index = ufshcd_wb_get_query_index(hba);
+	return ufshcd_query_flag_retry(hba, opcode, idn, index, NULL);
+}
+
+int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable)
+{
+	int ret;
 
 	if (!ufshcd_is_wb_allowed(hba))
 		return 0;
 
 	if (!(enable ^ hba->dev_info.wb_enabled))
 		return 0;
-	if (enable)
-		opcode = UPIU_QUERY_OPCODE_SET_FLAG;
-	else
-		opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
 
-	index = ufshcd_wb_get_query_index(hba);
-	ret = ufshcd_query_flag_retry(hba, opcode,
-				      QUERY_FLAG_IDN_WB_EN, index, NULL);
+	ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_EN);
 	if (ret) {
-		dev_err(hba->dev, "%s write booster %s failed %d\n",
+		dev_err(hba->dev, "%s Write Booster %s failed %d\n",
 			__func__, enable ? "enable" : "disable", ret);
 		return ret;
 	}
 
 	hba->dev_info.wb_enabled = enable;
-	dev_dbg(hba->dev, "%s write booster %s %d\n",
-			__func__, enable ? "enable" : "disable", ret);
+	dev_info(hba->dev, "%s Write Booster %s\n",
+			__func__, enable ? "enabled" : "disabled");
 
 	return ret;
 }
 
-static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
+static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
 {
-	int val;
-	u8 index;
-
-	if (set)
-		val =  UPIU_QUERY_OPCODE_SET_FLAG;
-	else
-		val = UPIU_QUERY_OPCODE_CLEAR_FLAG;
+	int ret;
 
-	index = ufshcd_wb_get_query_index(hba);
-	return ufshcd_query_flag_retry(hba, val,
-				QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8,
-				index, NULL);
+	ret = __ufshcd_wb_toggle(hba, set,
+			QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8);
+	if (ret) {
+		dev_err(hba->dev, "%s: WB-Buf Flush during H8 %s failed: %d\n",
+			__func__, set ? "enable" : "disable", ret);
+		return;
+	}
+	dev_dbg(hba->dev, "%s WB-Buf Flush during H8 %s\n",
+			__func__, set ? "enabled" : "disabled");
 }
 
-static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
+static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
 {
 	int ret;
-	u8 index;
-	enum query_opcode opcode;
 
 	if (!ufshcd_is_wb_allowed(hba) ||
 	    hba->dev_info.wb_buf_flush_enabled == enable)
-		return 0;
-
-	if (enable)
-		opcode = UPIU_QUERY_OPCODE_SET_FLAG;
-	else
-		opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
+		return;
 
-	index = ufshcd_wb_get_query_index(hba);
-	ret = ufshcd_query_flag_retry(hba, opcode,
-				      QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN, index,
-				      NULL);
+	ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN);
 	if (ret) {
 		dev_err(hba->dev, "%s WB-Buf Flush %s failed %d\n", __func__,
 			enable ? "enable" : "disable", ret);
-		goto out;
+		return;
 	}
 
 	hba->dev_info.wb_buf_flush_enabled = enable;
 
-	dev_dbg(hba->dev, "WB-Buf Flush %s\n", enable ? "enabled" : "disabled");
-out:
-	return ret;
-
+	dev_dbg(hba->dev, "%s WB-Buf Flush %s\n",
+			__func__, enable ? "enabled" : "disabled");
 }
 
 static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,

drivers/scsi/ufs/ufshcd.h

@@ -1104,7 +1104,7 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 			     u8 *desc_buff, int *buff_len,
 			     enum query_opcode desc_op);
 
-int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable);
+int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
 
 /* Wrapper functions for safely calling variant operations */
 static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)