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

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Date:   Mon, 4 Feb 2019 13:23:49 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        MSM <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     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>,
        Alim Akhtar <alim.akhtar@...sung.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 2/4/2019 12:51 PM, Avri Altman wrote:
> 
>> This reverts commit 60f0187031c05e04cbadffb62f557d0ff3564490.
>>
>> Calling ufshcd_set_vccq_rail_unused hangs my system.
>> It seems vccq is not *not* needed.
> This patch essentially implements the UFS_DEVICE_NO_VCCQ quirk,
> Which is needed for both Samsung and Hynix devices.

Needed, or optimal?
I'm rather sure Marc's device has a Samsung UFS chip, as do my devices 
and we've seen nothing but benefit from the proposed revert.

> Once acked by those vendors, can be removed from the quirk list as well.
> 
> Thanks,
> Avri
>>
>> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>


-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.