[v3] ufs: core: wlun suspend SSU/enter hibern8 fail recovery

From: Peter Wang <peter.wang@mediatek.com>

When SSU/enter hibern8 fail in wlun suspend flow, trigger error
handler and return busy to break the suspend.
If not, wlun runtime pm status become error and the consumer will
stuck in runtime suspend status.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
---
 drivers/ufs/core/ufshcd.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

On 12/1/22 23:35, peter.wang@mediatek.com wrote:
> From: Peter Wang <peter.wang@mediatek.com>
> 
> When SSU/enter hibern8 fail in wlun suspend flow, trigger error
> handler and return busy to break the suspend.
> If not, wlun runtime pm status become error and the consumer will
> stuck in runtime suspend status.
> 
> Signed-off-by: Peter Wang <peter.wang@mediatek.com>
> ---
>   drivers/ufs/core/ufshcd.c | 26 ++++++++++++++++++++++++++
>   1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index b1f59a5fe632..a0dbf2c410b1 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -9049,6 +9049,19 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>   
>   		if (!hba->dev_info.b_rpm_dev_flush_capable) {
>   			ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
> +			if (ret && (pm_op != UFS_SHUTDOWN_PM)) {
> +				/*
> +				 * If return err in suspend flow, IO will hang.
> +				 * Trigger error handler and break suspend for
> +				 * error recovery.
> +				 */
> +				spin_lock_irq(hba->host->host_lock);
> +				hba->force_reset = true;
> +				ufshcd_schedule_eh_work(hba);
> +				spin_unlock_irq(hba->host->host_lock);
> +
> +				ret = -EBUSY;
> +			}
>   			if (ret)
>   				goto enable_scaling;
>   		}
> @@ -9060,6 +9073,19 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>   	 */
>   	check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
>   	ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
> +	if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {
> +		/*
> +		 * If return err in suspend flow, IO will hang.
> +		 * Trigger error handler and break suspend for
> +		 * error recovery.
> +		 */
> +		spin_lock_irq(hba->host->host_lock);
> +		hba->force_reset = true;
> +		ufshcd_schedule_eh_work(hba);
> +		spin_unlock_irq(hba->host->host_lock);
> +
> +		ret = -EBUSY;
> +	}
>   	if (ret)
>   		goto set_dev_active;
>   

Please follow the coding style that is used elsewhere in the kernel and
remove the superfluous parentheses from this patch. "if (ret && (pm_op !=
UFS_SHUTDOWN_PM)) {" can be changed into "if (ret && pm_op !=
UFS_SHUTDOWN_PM) {" and "if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {" can be
changed into "if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {".

Otherwise this patch looks good to me.

Thanks,

Bart.

On Mon, 2022-12-05 at 10:41 -0800, Bart Van Assche wrote:
> On 12/1/22 23:35, peter.wang@mediatek.com wrote:
> > From: Peter Wang <peter.wang@mediatek.com>
> > 
> > When SSU/enter hibern8 fail in wlun suspend flow, trigger error
> > handler and return busy to break the suspend.
> > If not, wlun runtime pm status become error and the consumer will
> > stuck in runtime suspend status.
> > 
> > Signed-off-by: Peter Wang <peter.wang@mediatek.com>
> > ---
> >   drivers/ufs/core/ufshcd.c | 26 ++++++++++++++++++++++++++
> >   1 file changed, 26 insertions(+)
> > 
> > diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> > index b1f59a5fe632..a0dbf2c410b1 100644
> > --- a/drivers/ufs/core/ufshcd.c
> > +++ b/drivers/ufs/core/ufshcd.c
> > @@ -9049,6 +9049,19 @@ static int __ufshcd_wl_suspend(struct
> > ufs_hba *hba, enum ufs_pm_op pm_op)
> >   
> >   		if (!hba->dev_info.b_rpm_dev_flush_capable) {
> >   			ret = ufshcd_set_dev_pwr_mode(hba,
> > req_dev_pwr_mode);
> > +			if (ret && (pm_op != UFS_SHUTDOWN_PM)) {
> > +				/*
> > +				 * If return err in suspend flow, IO
> > will hang.
> > +				 * Trigger error handler and break
> > suspend for
> > +				 * error recovery.
> > +				 */
> > +				spin_lock_irq(hba->host->host_lock);
> > +				hba->force_reset = true;
> > +				ufshcd_schedule_eh_work(hba);
> > +				spin_unlock_irq(hba->host->host_lock);
> > +
> > +				ret = -EBUSY;
> > +			}
> >   			if (ret)
> >   				goto enable_scaling;
> >   		}
> > @@ -9060,6 +9073,19 @@ static int __ufshcd_wl_suspend(struct
> > ufs_hba *hba, enum ufs_pm_op pm_op)
> >   	 */
> >   	check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
> >   	ret = ufshcd_link_state_transition(hba, req_link_state,
> > check_for_bkops);
> > +	if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {
> > +		/*
> > +		 * If return err in suspend flow, IO will hang.
> > +		 * Trigger error handler and break suspend for
> > +		 * error recovery.
> > +		 */
> > +		spin_lock_irq(hba->host->host_lock);
> > +		hba->force_reset = true;
> > +		ufshcd_schedule_eh_work(hba);
> > +		spin_unlock_irq(hba->host->host_lock);
> > +
> > +		ret = -EBUSY;
> > +	}
> >   	if (ret)
> >   		goto set_dev_active;
> >   
> 
> Please follow the coding style that is used elsewhere in the kernel
> and
> remove the superfluous parentheses from this patch. "if (ret &&
> (pm_op !=
> UFS_SHUTDOWN_PM)) {" can be changed into "if (ret && pm_op !=
> UFS_SHUTDOWN_PM) {" and "if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {"
> can be
> changed into "if ((ret) && (pm_op != UFS_SHUTDOWN_PM)) {".
> 
> Otherwise this patch looks good to me.
> 
> Thanks,

Hi Bart,

Got it, will remove parentheses next version.
Thanks for review.

BR
Peter


> 
> Bart.