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

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Message-ID: <SN6PR04MB464071B647084B0EB111992DFCB60@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Wed, 20 May 2020 21:33:37 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Asutosh Das <asutoshd@...eaurora.org>,
        "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,

> 
> 
> 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.

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?

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

Thanks,
Avri