[PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n specs violation

Ziqi Chen
2021-01-08T07:30:07Z

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@codeaurora.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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