scsi: ufs: Cleanup WriteBooster feature

Small cleanup as below items,

 1. Use ufshcd_is_wb_allowed() directly instead of ufshcd_wb_sup() since
    ufshcd_wb_sup() just returns the result of ufshcd_is_wb_allowed().

 2. In ufshcd_suspend(), "else if (!ufshcd_is_runtime_pm(pm_op)) can be
    simplified to "else" since both have the same meaning.

This patch does not change any functionality.

Link: https://lore.kernel.org/r/20200508080115.24233-9-stanley.chu@mediatek.comReviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufshcd.c

@@ -253,7 +253,6 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
 static irqreturn_t ufshcd_intr(int irq, void *__hba);
 static int ufshcd_change_power_mode(struct ufs_hba *hba,
 			     struct ufs_pa_layer_attr *pwr_mode);
-static bool ufshcd_wb_sup(struct ufs_hba *hba);
 static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba);
 static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba);
 static int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable);
@@ -285,7 +284,7 @@ static inline void ufshcd_wb_config(struct ufs_hba *hba)
 {
 	int ret;
 
-	if (!ufshcd_wb_sup(hba))
+	if (!ufshcd_is_wb_allowed(hba))
 		return;
 
 	ret = ufshcd_wb_ctrl(hba, true);
@@ -5197,18 +5196,13 @@ static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
 				__func__, err);
 }
 
-static bool ufshcd_wb_sup(struct ufs_hba *hba)
-{
-	return ufshcd_is_wb_allowed(hba);
-}
-
 static int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable)
 {
 	int ret;
 	u8 index;
 	enum query_opcode opcode;
 
-	if (!ufshcd_wb_sup(hba))
+	if (!ufshcd_is_wb_allowed(hba))
 		return 0;
 
 	if (!(enable ^ hba->wb_enabled))
@@ -5264,7 +5258,7 @@ static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba)
 	int ret;
 	u8 index;
 
-	if (!ufshcd_wb_sup(hba) || hba->wb_buf_flush_enabled)
+	if (!ufshcd_is_wb_allowed(hba) || hba->wb_buf_flush_enabled)
 		return 0;
 
 	index = ufshcd_wb_get_flag_index(hba);
@@ -5286,7 +5280,7 @@ static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba)
 	int ret;
 	u8 index;
 
-	if (!ufshcd_wb_sup(hba) || !hba->wb_buf_flush_enabled)
+	if (!ufshcd_is_wb_allowed(hba) || !hba->wb_buf_flush_enabled)
 		return 0;
 
 	index = ufshcd_wb_get_flag_index(hba);
@@ -5336,7 +5330,7 @@ static bool ufshcd_wb_keep_vcc_on(struct ufs_hba *hba)
 	int ret;
 	u32 avail_buf;
 
-	if (!ufshcd_wb_sup(hba))
+	if (!ufshcd_is_wb_allowed(hba))
 		return false;
 	/*
 	 * The ufs device needs the vcc to be ON to flush.
@@ -8235,12 +8229,12 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		 * configured WB type is 70% full, keep vcc ON
 		 * for the device to flush the wb buffer
 		 */
-		if ((hba->auto_bkops_enabled && ufshcd_wb_sup(hba)) ||
+		if ((hba->auto_bkops_enabled && ufshcd_is_wb_allowed(hba)) ||
 		    ufshcd_wb_keep_vcc_on(hba))
 			hba->dev_info.keep_vcc_on = true;
 		else
 			hba->dev_info.keep_vcc_on = false;
-	} else if (!ufshcd_is_runtime_pm(pm_op)) {
+	} else {
 		hba->dev_info.keep_vcc_on = false;
 	}