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

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Date:   Tue, 25 May 2021 09:44:29 -0700
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     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>,
        "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

On 5/25/2021 12:57 AM, Lee Jones wrote:
> On Wed, 20 May 2020 at 22:59, Asutosh Das (asd) <asutoshd@...eaurora.org 
> <mailto:asutoshd@...eaurora.org>> wrote:
> 
>     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
>     <mailto: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.
> 
> 
> Good morning Asd,
> 
> Any luck with getting this upstream?
> 
> Looks like this was the last submission.
> 
> Did something change?  Is this no longer required?
> 
Hi Lee
This slipped away. I may not get to this soon.
I'd prefer to drop it for now and come back to it when I've some time.

Thanks,
-asd

> -- 
> Lee Jones [李琼斯]
> Linaro Services Senior Technical Lead
> Linaro.org │ Open source software for ARM SoCs
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