linux-kernel - Re: [PATCH v3 2/2] scsi: ufs: core: Replace hard coded vcc-off delay with a variable

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Message-ID: <029cdc3ae16fd669a862cf49a9e082561582aacb.camel@mediatek.com>
Date: Tue, 14 Oct 2025 02:07:14 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>, "bvanassche@....org"
	<bvanassche@....org>, "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
	"quic_nitirawa@...cinc.com" <quic_nitirawa@...cinc.com>,
	"avri.altman@....com" <avri.altman@....com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"beanhuo@...ron.com" <beanhuo@...ron.com>, "neil.armstrong@...aro.org"
	<neil.armstrong@...aro.org>, "alim.akhtar@...sung.com"
	<alim.akhtar@...sung.com>, "James.Bottomley@...senPartnership.com"
	<James.Bottomley@...senPartnership.com>, "ebiggers@...nel.org"
	<ebiggers@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] scsi: ufs: core: Replace hard coded vcc-off delay
 with a variable

On Mon, 2025-10-13 at 12:38 -0700, Bao D. Nguyen wrote:
> 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.
> 
> Replace the hard coded 5ms delay with a variable with a default
> setting of 2ms to improve the system resume latency. The platform
> drivers can override this setting as needed.
> 
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
> Reviewed-by: Bart Van Assche <bvanassche@....org>

Reviewed-by: Peter Wang <peter.wang@...iatek.com>