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

[Peter Wang (王信友)]

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
>