linux-kernel - Re: [PATCH v1 1/2] scsi: ufs: set device as default active power mode during initialization only

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Date:   Mon, 30 Dec 2019 15:24:54 -0800
From:   asutoshd@...eaurora.org
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com,
        pedrom.sousa@...opsys.com, jejb@...ux.ibm.com,
        matthias.bgg@...il.com, bvanassche@....org,
        subhashj@...eaurora.org, beanhuo@...ron.com, cang@...eaurora.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com,
        stable@...r.kernel.org, linux-scsi-owner@...r.kernel.org
Subject: Re: [PATCH v1 1/2] scsi: ufs: set device as default active power mode
 during initialization only

Hi Stanley,

On 2019-12-30 00:12, Stanley Chu wrote:
> Currently ufshcd_probe_hba() always sets device status as "active".
> This shall be by an assumption that device is already in active state
> during the boot stage before kernel.
> 
> However, if link is configured as "off" state and device is requested
> to enter "sleep" or "powerdown" power mode during suspend flow, device
> will NOT be waken up to "active" power mode during resume flow because
> device is already set as "active" power mode in ufhcd_probe_hba().
> 
> Fix it by setting device as default active power mode during
> initialization only, and skipping changing mode during PM flow
> in ufshcd_probe_hba().
> 
> Fixes: 7caf489b99a4 (scsi: ufs: issue link starup 2 times if device
> isn't active)
> Cc: Alim Akhtar <alim.akhtar@...sung.com>
> Cc: Avri Altman <avri.altman@....com>
> Cc: Bart Van Assche <bvanassche@....org>
> Cc: Bean Huo <beanhuo@...ron.com>
> Cc: Can Guo <cang@...eaurora.org>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Subhash Jadavani <subhashj@...eaurora.org>
> Cc: stable@...r.kernel.org
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ed02a704c1c2..9abb7085a5d0 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6986,7 +6986,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
>  	ufshcd_tune_unipro_params(hba);
> 
>  	/* UFS device is also active now */
> -	ufshcd_set_ufs_dev_active(hba);
> +	if (!hba->pm_op_in_progress)
> +		ufshcd_set_ufs_dev_active(hba);
>  	ufshcd_force_reset_auto_bkops(hba);
>  	hba->wlun_dev_clr_ua = true;

I see that there's a get_sync done before.
So, how would the suspend be triggered in that case?

Thanks,
asd