linux-kernel - v2: scsi: ufshcd: use a macro for UFS versions

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Date:   Tue, 09 Mar 2021 11:54:48 +0000
From:   Caleb Connolly <caleb@...nolly.tech>
To:     caleb@...nolly.tech
Cc:     alim.akhtar@...sung.com, avri.altman@....com, ejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        cang@...eaurora.org, beanhuo@...ron.com, jaegeuk@...nel.org,
        asutoshd@...eaurora.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: v2: scsi: ufshcd: use a macro for UFS versions

When using a device with UFS > 2.1 the error "invalid UFS version" is
misleadingly printed. There was a patch for this almost a year
ago to which this solution was suggested.

This series replaces the use of the growing UFSHCI_VERSION_xy macros with
an inline function to encode a major and minor version into the scheme
used on devices, that being:

        (major << 8) + (minor << 4)

I dealt with the different encoding used for UFS 1.x by converting it
to match the newer versions in ufshcd_get_ufs_version(). That means it's
possible to use comparisons for version checks, e.g.

        if (hba->ufs_version < ufshci_version(3, 0))
                ...

I've also dropped the "invalid UFS version" check entirely as it seems to
be more misleading than useful, and hasn't been accurate for a long time.

This has been tested on a device with UFS 3.0 and a device with UFS 2.1,
however I don't own any older devices to test with.

        Caleb
---
Changes since v1:
 * Switch from macro to static inline function
 * Address Christoph's formatting comments
 * Add Nitin's signoff on patch 3 ("scsi: ufshcd: remove version check")

Caleb Connolly (3):
      scsi: ufshcd: use a function to calculate versions
      scsi: ufs: qcom: use ufshci_version function
      scsi: ufshcd: remove version check

 drivers/scsi/ufs/ufs-qcom.c |  4 +--
 drivers/scsi/ufs/ufshcd.c   | 66 ++++++++++++++++++---------------------------
 drivers/scsi/ufs/ufshci.h   | 17 +++++++-----
 3 files changed, 38 insertions(+), 49 deletions(-)