linux-kernel - RE: [PATCH v3 1/3] scsi: ufshcd: use a function to calculate versions

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Date:   Thu, 11 Mar 2021 07:35:27 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Caleb Connolly <caleb@...nolly.tech>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     "ejb@...ux.ibm.com" <ejb@...ux.ibm.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: RE: [PATCH v3 1/3] scsi: ufshcd: use a function to calculate versions

> Hi Avri,
> 
> On 10/03/2021 4:34 pm, Avri Altman wrote:
> >> @@ -9298,10 +9291,7 @@ int ufshcd_init(struct ufs_hba *hba, void
> __iomem
> >> *mmio_base, unsigned int irq)
> >>          /* Get UFS version supported by the controller */
> >>          hba->ufs_version = ufshcd_get_ufs_version(hba);
> >>
> >> -       if ((hba->ufs_version != UFSHCI_VERSION_10) &&
> >> -           (hba->ufs_version != UFSHCI_VERSION_11) &&
> >> -           (hba->ufs_version != UFSHCI_VERSION_20) &&
> >> -           (hba->ufs_version != UFSHCI_VERSION_21))
> >> +       if (hba->ufs_version < ufshci_version(1, 0))
> >>                  dev_err(hba->dev, "invalid UFS version 0x%x\n",
> >>                          hba->ufs_version);
> > Here you replaces the specific allowable values, with an expression
> > That doesn't really reflects those values.
> 
> I took this approach based on feedback from previous patches:
> 
> https://lore.kernel.org/linux-
> scsi/d1b23943b6b3ae6c1f6af041cc592932@...eaurora.org/
> 
> https://lkml.org/lkml/2020/4/25/159
> 
> 
> Patch 3 of this series removes this check entirely, as it is neither
> accurate or useful.
I noticed that.

> 
> The driver does not fail when printing this error, nor is the list of
> "valid" UFS versions here kept up to date, I struggle to see a situation
> in which that error message would actually be helpful. Responses to
> previous patches (above) that added UFS 3.0 to the list have all
> suggested that removing this check is a more sensible approach.
OK.

Thanks,
Avri