From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
<jejb@linux.ibm.com>
Cc: <beanhuo@micron.com>, <asutoshd@codeaurora.org>,
<cang@codeaurora.org>, <matthias.bgg@gmail.com>,
<bvanassche@acm.org>, <linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kuohong.wang@mediatek.com>,
<peter.wang@mediatek.com>, <chun-hung.wu@mediatek.com>,
<andy.teng@mediatek.com>, Stanley Chu <stanley.chu@mediatek.com>
Subject: [PATCH v2 7/8] scsi: ufs: make HCE polling more compact to improve initializatoin latency
Date: Thu, 12 Mar 2020 19:09:07 +0800 [thread overview]
Message-ID: <20200312110908.14895-8-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200312110908.14895-1-stanley.chu@mediatek.com>
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@mediatek.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
next prev parent reply other threads:[~2020-03-12 11:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 11:09 [PATCH v2 0/8] scsi: ufs: some cleanups and make the delay for host enabling customizable Stanley Chu
2020-03-12 11:09 ` [PATCH v2 1/8] scsi: ufs: fix uninitialized tx_lanes in ufshcd_disable_tx_lcc() Stanley Chu
2020-03-12 17:27 ` Asutosh Das (asd)
2020-03-12 11:09 ` [PATCH v2 2/8] scsi: ufs: remove init_prefetch_data in struct ufs_hba Stanley Chu
2020-03-12 17:33 ` Asutosh Das (asd)
2020-03-12 11:09 ` [PATCH v2 3/8] scsi: ufs: use an enum for host capabilities Stanley Chu
2020-03-12 17:34 ` Asutosh Das (asd)
2020-03-12 11:09 ` [PATCH v2 4/8] scsi: ufs: introduce common delay function Stanley Chu
2020-03-12 11:09 ` [PATCH v2 5/8] scsi: ufs-mediatek: replace all delay places by " Stanley Chu
2020-03-12 11:09 ` [PATCH v2 6/8] scsi: ufs: allow customized delay for host enabling Stanley Chu
2020-03-12 11:09 ` Stanley Chu [this message]
2020-03-12 11:09 ` [PATCH v2 8/8] scsi: ufs-mediatek: customize the " Stanley Chu
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