RE: [RFC PATCH v2 2/5] scsi: ufs: Add UFS-feature layer

[Avri Altman]

> 
> Hi, Bean
> >
> > On Mon, 2020-06-15 at 16:23 +0900, Daejun Park wrote:
> > > +void ufsf_scan_features(struct ufs_hba *hba)
> > > +{
> > > +       int ret;
> > > +
> > > +       init_waitqueue_head(&hba->ufsf.sdev_wait);
> > > +       atomic_set(&hba->ufsf.slave_conf_cnt, 0);
> > > +
> > > +       if (hba->dev_info.wspecversion >= HPB_SUPPORTED_VERSION &&
> > > +           (hba->dev_info.b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT))
> >
> > How about removing this check "(hba->dev_info.wspecversion >=
> > HPB_SUPPORTED_VERSION" since ufs with lower version than v3.1 can add
> > HPB feature by FFU,
> > if (hba->dev_info.b_ufs_feature_sup  &UFS_FEATURE_SUPPORT_HPB_BIT) is
> > enough.
> OK, changing it seems no problem. But I want to know what other people
> think
> about this version checking code.
HPB1.0 isn't part of ufs3.1, but published only later.
Allowing earlier versions will required to quirk the descriptor sizes.
I see Bean's point here, but I vote for adding it in a single quirk, when the time comes. 

Thanks,
Avri