linux-kernel - [PATCH v1 2/2] scsi: ufs: core: Reduce the sleep before vcc can be powered on

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Message-ID: <b9467720ccabbabd6d3d230a21f9ffb24721f1ed.1759348507.git.quic_nguyenb@quicinc.com>
Date: Wed, 1 Oct 2025 13:57:12 -0700
From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To: <quic_cang@...cinc.com>, <quic_nitirawa@...cinc.com>, <bvanassche@....org>,
        <avri.altman@....com>, <peter.wang@...iatek.com>,
        <manivannan.sadhasivam@...aro.org>, <adrian.hunter@...el.com>,
        <martin.petersen@...cle.com>
CC: <linux-scsi@...r.kernel.org>, "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley"
	<James.Bottomley@...senPartnership.com>,
        Bean Huo <beanhuo@...ron.com>,
        "open
 list" <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 2/2] scsi: ufs: core: Reduce the sleep before vcc can be powered on

After the ufs device vcc is powered off, all the ufs device
manufacturers require a minimum of 1ms of power-off time before
vcc can be powered on again. This requirement has been verified
with all the ufs device manufacturer's datasheets.
Improve the system resume latency by reducing the required power-off
time from 5ms to 2ms. The chosen 2ms should include enough
additional buffer time without being wasteful.

Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
---
 drivers/ufs/core/ufshcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 45e509b..83bd731 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -9741,7 +9741,7 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
 	 * All UFS devices require delay after VCC power rail is turned-off.
 	 */
 	if (vcc_off && hba->vreg_info.vcc)
-		usleep_range(5000, 5100);
+		usleep_range(2000, 2100);
 }
 
 #ifdef CONFIG_PM
-- 
2.7.4