linux-kernel - Re: [PATCH v4 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock scaling

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Date:   Wed, 20 May 2020 14:59:23 -0700
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "PedroM.Sousa@...opsys.com" <PedroM.Sousa@...opsys.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Cc:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] scsi: ufs-qcom: enter and exit hibern8 during
 clock scaling

Hi Avri,

On 5/20/2020 2:33 PM, Avri Altman wrote:
> Hi,
> 
>>
>>
>> Qualcomm controller needs to be in hibern8 before scaling clocks.
>> This change puts the controller in hibern8 state before scaling
>> and brings it out after scaling of clocks.
>>
>> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
> 
> I guess that your previous versions are pretty far back - ,
> I noticed a comment by Pedro, so you might want to resend this series.
> 
Ok.

> What happens if the pre-change is successful,
> but you are not getting to the post change because, e.g. ufshcd_set_clk_freq failed?
> 
I agree. Let me check this.

> Also, this piece of code is ~5 years old, so you might want to elaborate on how come hibernation is now needed.
> 
> Thanks,
> Avri
> 

Thanks for the review. Hibernation was needed since long actually.
I guess it was never pushed upstream.

Thanks,
-asd

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