linux-kernel - [PATCH v4 7/8] scsi: ufs: make HCE polling more compact to improve initializatoin latency

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Date:   Fri, 13 Mar 2020 17:01:02 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>
CC:     <beanhuo@...ron.com>, <asutoshd@...eaurora.org>,
        <cang@...eaurora.org>, <matthias.bgg@...il.com>,
        <bvanassche@....org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v4 7/8] scsi: ufs: make HCE polling more compact to improve initializatoin latency

Reduce the waiting period between each HCE (Host Controller Enable)
polling from 5 ms to 1 ms. In the same time, increase the maximum polling
times to make "total polling time" unchanged approximately.

This change could make HCE initializatoin faster to improve latency of
ufshcd initialization, error recovery, and resume behaviors.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufshcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index dcbf45d547d8..cd33d07c56cf 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4301,7 +4301,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba)
 	ufshcd_wait_us(hba->hba_enable_delay_us, 100, true);
 
 	/* wait for the host controller to complete initialization */
-	retry = 10;
+	retry = 50;
 	while (ufshcd_is_hba_active(hba)) {
 		if (retry) {
 			retry--;
@@ -4310,7 +4310,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba)
 				"Controller enable failed\n");
 			return -EIO;
 		}
-		ufshcd_wait_us(5000, 100, true);
+		ufshcd_wait_us(1000, 100, true);
 	}
 
 	/* enable UIC related interrupts */
-- 
2.18.0