Messages in this thread Patch in this message | | | From | Ziqi Chen <> | Subject | [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n specs violation | Date | Fri, 8 Jan 2021 15:28:04 +0800 |
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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); } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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