linux-kernel - [PATCH] scsi: ufs: Don't check UFSHCD_CAP_WB_EN capability in ufshcd_wb_toggle{

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Date:   Fri, 19 Mar 2021 14:53:05 +0800
From:   Yue Hu <zbestahu@...il.com>
To:     martin.petersen@...cle.com, avri.altman@....com,
        jejb@...ux.ibm.com, alim.akhtar@...sung.com,
        linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, huyue2@...ong.com, zbestahu@....com
Subject: [PATCH] scsi: ufs: Don't check UFSHCD_CAP_WB_EN capability in ufshcd_wb_toggle{_flush}

From: Yue Hu <huyue2@...ong.com>

There are several redundant calls to ufshcd_is_wb_allowed() as below:

ufshcd_wb_config()
  |-> ufshcd_is_wb_allowed()
  |-> ufshcd_wb_toggle() -> ufshcd_is_wb_allowed()
  |-> ufshcd_wb_toggle_flush() -> ufshcd_is_wb_allowed()

wb_on_store()
  |-> ufshcd_is_wb_allowed()
  |-> ufshcd_wb_toggle() -> ufshcd_is_wb_allowed()

Considering code handling in wb_on_store(), let's remove needless
ufshcd_is_wb_allowed() in ufshcd_wb_toggle(). Meanwhile, keep the
check in caller ufshcd_devfreq_scale(). Accordingly, also remove
the redundant check in ufshcd_wb_toggle_flush().

Signed-off-by: Yue Hu <huyue2@...ong.com>
---
 drivers/scsi/ufs/ufshcd.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b6bfc80..ee71cba 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1260,7 +1260,8 @@ 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_toggle(hba, scale_up);
+	if (ufshcd_is_wb_allowed(hba))
+		ufshcd_wb_toggle(hba, scale_up);
 
 out_unprepare:
 	ufshcd_clock_scaling_unprepare(hba, is_writelock);
@@ -5438,9 +5439,6 @@ 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;
 
@@ -5477,8 +5475,7 @@ static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
 {
 	int ret;
 
-	if (!ufshcd_is_wb_allowed(hba) ||
-	    hba->dev_info.wb_buf_flush_enabled == enable)
+	if (hba->dev_info.wb_buf_flush_enabled == enable)
 		return;
 
 	ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN);
-- 
1.9.1