linux-kernel - Re: [PATCH v3 5/5] Revert "scsi: ufs: disable vccq if it's not needed by UFS device"

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Message-ID: <7610c262-1451-9bb2-48a6-4daf6f534f6c@free.fr>
Date:   Tue, 5 Feb 2019 18:51:45 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Alim Akhtar <alim.akhtar@...sung.com>,
        MSM <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Jeffrey Hugo <jhugo@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Bart Van Assche <bvanassche@....org>,
        SCSI <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] Revert "scsi: ufs: disable vccq if it's not needed
 by UFS device"

On 05/02/2019 18:24, Marc Gonzalez wrote:

> /*** system hangs here for several seconds, then reboots ***/

Silly me. The system crashes in ufshcd_dump_regs() which is a bug
I fixed myself. Once I cherry-pick the appropriate fix, the board
no longer reboots, but UFS init does fail.

Full boot log here:
https://pastebin.ubuntu.com/p/KwpRnWMFw5/

In any case, it's obvious that disabling vccq on this system is
a mistake. How would you solve the problem? (A quirk on top of a
quirk sounds silly.)

Regards.