linux-kernel - Re: [PATCH v1 1/2] scsi: ufs: core: Remove UFS_DEVICE_QUIRK_DELAY_AFTER

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Message-ID: <bc223eabf97d4c530a43c4831fe6ba2be7ae43b9.camel@mediatek.com>
Date: Tue, 7 Oct 2025 07:02:18 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
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Subject: Re: [PATCH v1 1/2] scsi: ufs: core: Remove
 UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk

On Fri, 2025-10-03 at 14:11 -0700, Bao D. Nguyen wrote:
> Are you referring to the always_on flag in the struct ufs_vreg? I
> believe currently the ufs_vreg's always_on flag isn't used in
> determining whether the delay is applied or not.
> 

Hi Bao,

Yes, I mean vreg_info.vcc->always_on = true.
Before your change, Mediatek would set always_on = true 
and remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM to disable 
this delay.


> How about we add the check for the Vcc's always_on as shown below?
> The Mediatek's workaround can avoid the extra delay by setting the
> always_on flag as it already did, without using the
> UFS_DEVICE_QUIRK_DELAY_AFTER_LPM.
> 
> if (vcc_off && hba->vreg_info.vcc && !hba->vreg_info.vcc->always_on)
>         usleep_range(5000, 5100);
> 
> Thanks, Bao
> 
> 

Yes, I believe this is the correct way to do it.

Thanks
Peter