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

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Message-ID: <85bce5dc28293f48e32b64eed5591d66c54c9e69.camel@mediatek.com>
Date: Tue, 7 Oct 2025 07:04:10 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "avri.altman@....com" <avri.altman@....com>, "quic_cang@...cinc.com"
	<quic_cang@...cinc.com>, "quic_nitirawa@...cinc.com"
	<quic_nitirawa@...cinc.com>, "quic_nguyenb@...cinc.com"
	<quic_nguyenb@...cinc.com>, "manivannan.sadhasivam@...aro.org"
	<manivannan.sadhasivam@...aro.org>, "bvanassche@....org"
	<bvanassche@....org>, "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"beanhuo@...ron.com" <beanhuo@...ron.com>, "alim.akhtar@...sung.com"
	<alim.akhtar@...sung.com>, "James.Bottomley@...senPartnership.com"
	<James.Bottomley@...senPartnership.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] scsi: ufs: core: Reduce the sleep before vcc can
 be powered on

On Fri, 2025-10-03 at 14:27 -0700, Bao D. Nguyen wrote:
> With the current or recent offerings of ufs devices in the market,
> the
> requirement is 1ms. For example, the Kioxia datasheet says "Vcc shall
> be
> kept less than 0.3V for at least 1ms before it goes beyond 0.3V
> again".
> Similarly other vendors have this 1ms requirement. So I believe this
> indicates the worst case scenario.
> I understand there may be very old devices that are upgrading the
> kernel
> only. In that case I don't know the specifics for these old ufs parts
> as
> mentioned.
> 
> Thanks, Bao
> 

Hi Bao,

Please consider using module_param_cb to set the default 
delay to 2ms(or 1ms). At the same time, we should keep the
flexibility for devices that may require a longer delay by
allowing them to extend the delay through a module parameter.

Thanks
Peter
>