[PATCH v2] scsi: ufs: core: check asymmetric connected lanes

[PATCH v2] scsi: ufs: core: check asymmetric connected lanes

[SEO HOYOUNG]

Performance problems may occur if there is a problem with the
asymmetric connected lane such as h/w failure.
Currently, only check connected lane for rx/tx is checked if it is not 0.
But it should also be checked if it is asymmetrically connected.

v1 -> v2: add error routine.
ufs initialization error occurs in case of asymmetic connected

Signed-off-by: SEO HOYOUNG <hy50.seo@samsung.com>
---
 drivers/ufs/core/ufshcd.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 24a32e2fd75e..1381eb7d506a 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -4540,6 +4540,14 @@ static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
 		return -EINVAL;
 	}
 
+	if (pwr_info->lane_rx != pwr_info->lane_tx) {
+		dev_err(hba->dev, "%s: asymmetric connected lanes. rx=%d, tx=%d\n",
+			__func__,
+				pwr_info->lane_rx,
+				pwr_info->lane_tx);
+		return -EINVAL;
+	}
+
 	/*
 	 * First, get the maximum gears of HS speed.
 	 * If a zero value, it means there is no HSGEAR capability.
@@ -8579,7 +8587,8 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
 		hba->dev_info.f_power_on_wp_en = flag;
 
 	/* Probe maximum power mode co-supported by both UFS host and device */
-	if (ufshcd_get_max_pwr_mode(hba))
+	ret = ufshcd_get_max_pwr_mode(hba);
+	if (ret)
 		dev_err(hba->dev,
 			"%s: Failed getting max supported power mode\n",
 			__func__);
-- 
2.26.0

Re: [PATCH v2] scsi: ufs: core: check asymmetric connected lanes

[Bart Van Assche]

On 10/7/24 11:38 PM, SEO HOYOUNG wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 24a32e2fd75e..1381eb7d506a 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -4540,6 +4540,14 @@ static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
>   		return -EINVAL;
>   	}
>   
> +	if (pwr_info->lane_rx != pwr_info->lane_tx) {
> +		dev_err(hba->dev, "%s: asymmetric connected lanes. rx=%d, tx=%d\n",
> +			__func__,
> +				pwr_info->lane_rx,
> +				pwr_info->lane_tx);
> +		return -EINVAL;
> +	}
> +
>   	/*
>   	 * First, get the maximum gears of HS speed.
>   	 * If a zero value, it means there is no HSGEAR capability.
> @@ -8579,7 +8587,8 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
>   		hba->dev_info.f_power_on_wp_en = flag;
>   
>   	/* Probe maximum power mode co-supported by both UFS host and device */
> -	if (ufshcd_get_max_pwr_mode(hba))
> +	ret = ufshcd_get_max_pwr_mode(hba);
> +	if (ret)
>   		dev_err(hba->dev,
>   			"%s: Failed getting max supported power mode\n",
>   			__func__);

I see two independent changes in the above patch. Should this patch
perhaps be split into two patches?

Thanks,

Bart.