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

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Message-Id: <1610090885-50099-3-git-send-email-ziqichen@codeaurora.org>
Date:   Fri,  8 Jan 2021 15:28:04 +0800
From:   Ziqi Chen <ziqichen@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        cang@...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,
        ziqichen@...eaurora.org, kwmad.kim@...sung.com,
        stanley.chu@...iatek.com
Cc:     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 (open list:ARM/QUALCOMM SUPPORT),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n specs violation

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