linux-kernel - Re: [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST

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Date:   Fri, 08 Jan 2021 16:05:58 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Ziqi Chen <ziqichen@...eaurora.org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        kwmad.kim@...sung.com, stanley.chu@...iatek.com,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n specs violation

On 2021-01-08 15:28, Ziqi Chen wrote:
> As per specs, e.g, JESD220E chapter 7.2, while powering
> off/on the ufs device, RST_n signal should be between
> VSS(Ground) and VCCQ/VCCQ2.
> 
> Signed-off-by: Ziqi Chen <ziqichen@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufs-qcom.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index 2206b1e..d8b896c 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -582,6 +582,10 @@ static int ufs_qcom_suspend(struct ufs_hba *hba,
> enum ufs_pm_op pm_op)
>  		ufs_qcom_disable_lane_clks(host);
>  		phy_power_off(phy);
> 
> +		/* reset the connected UFS device during power down */
> +		if (host->device_reset)
> +			gpiod_set_value_cansleep(host->device_reset, 1);
> +

Instead of calling gpiod_set_value(1/0) directly,
can we have a wrapper func for it?

Thanks,
Can Guo.

>  	} else if (!ufs_qcom_is_link_active(hba)) {
>  		ufs_qcom_disable_lane_clks(host);
>  	}