linux-kernel - Re: [PATCH v4 04/10] scsi: ufs: Enable IRQ after enabling clocks in error handling preparation

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Date:   Wed, 23 Jun 2021 14:20:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        ziqichen@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 04/10] scsi: ufs: Enable IRQ after enabling clocks in
 error handling preparation

On 6/23/21 12:35 AM, Can Guo wrote:
> In error handling preparation, enable IRQ after enabling clocks in case
> unclocked register access happens.
> 
> Fixes: c72e79c0ad2bd ("scsi: ufs: Recover HBA runtime PM error in error handler")
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ee70522..5f837c4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -5927,13 +5927,14 @@ static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
>  		 * can be OFF or in LPM.
>  		 */
>  		ufshcd_setup_hba_vreg(hba, true);
> -		ufshcd_enable_irq(hba);
>  		ufshcd_setup_vreg(hba, true);
>  		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
>  		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
>  		ufshcd_hold(hba, false);
> -		if (!ufshcd_is_clkgating_allowed(hba))
> +		if (!ufshcd_is_clkgating_allowed(hba)) {
>  			ufshcd_setup_clocks(hba, true);
> +			ufshcd_enable_irq(hba);
> +		}
>  		ufshcd_release(hba);
>  		pm_op = hba->is_wlu_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
>  		ufshcd_vops_resume(hba, pm_op);

Reviewed-by: Bart Van Assche <bvanassche@....org>