[PATCH AUTOSEL 5.12 45/63] scsi: ufs: ufs-mediatek: Fix power down spec violation
From: Sasha Levin <sashal@kernel.org>
Date: 2021-05-24 14:50:29
Also in:
linux-arm-kernel, linux-scsi, lkml, stable
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
From: Peter Wang <peter.wang@mediatek.com> [ Upstream commit c625b80b9d00f3546722cd77527f9697c8c4c911 ] As per spec, e.g. JESD220E chapter 7.2, while powering off the UFS device, RST_N signal should be between VSS(Ground) and VCCQ/VCCQ2. The power down sequence after fixing: Power down: 1. Assert RST_N low 2. Turn-off VCC 3. Turn-off VCCQ/VCCQ2 Link: https://lore.kernel.org/r/1620813706-25331-1-git-send-email-peter.wang@mediatek.com (local) Reviewed-by: Stanley Chu <redacted> Signed-off-by: Peter Wang <peter.wang@mediatek.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/scsi/ufs/ufs-mediatek.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index a981f261b304..aee3cfc7142a 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c@@ -922,6 +922,7 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm) static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { int err; + struct arm_smccc_res res; if (ufshcd_is_link_hibern8(hba)) { err = ufs_mtk_link_set_lpm(hba);
@@ -941,6 +942,9 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) goto fail; } + if (ufshcd_is_link_off(hba)) + ufs_mtk_device_reset_ctrl(0, res); + return 0; fail: /*
--
2.30.2
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