linux-kernel - Re: [PATCH v2 5/5] scsi: ufs: qcom: Enable RPM

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Date:   Sat, 23 Apr 2022 08:20:01 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     martin.petersen@...cle.com, jejb@...ux.ibm.com,
        avri.altman@....com, alim.akhtar@...sung.com,
        linux-arm-msm@...r.kernel.org, quic_asutoshd@...cinc.com,
        quic_cang@...cinc.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, bvanassche@....org,
        ahalaney@...hat.com
Subject: Re: [PATCH v2 5/5] scsi: ufs: qcom: Enable RPM_AUTOSUSPEND for
 runtime PM

On Sat 23 Apr 07:02 PDT 2022, Manivannan Sadhasivam wrote:

> In order to allow the block devices to enter autosuspend mode during
> runtime, thereby allowing the ufshcd host driver to also runtime suspend,
> let's make use of the RPM_AUTOSUSPEND flag.
> 
> Without this flag, userspace needs to enable the autosuspend feature of
> the block devices through sysfs.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/scsi/ufs/ufs-qcom.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index f47a16b7cff5..34c5970db445 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -876,6 +876,7 @@ static void ufs_qcom_set_caps(struct ufs_hba *hba)
>  	hba->caps |= UFSHCD_CAP_WB_EN;
>  	hba->caps |= UFSHCD_CAP_CRYPTO;
>  	hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
> +	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
>  
>  	if (host->hw_ver.major >= 0x2) {
>  		host->caps = UFS_QCOM_CAP_QUNIPRO |
> -- 
> 2.25.1
>