linux-kernel - [PATCH 6/6] scsi: ufs: exynos: put ufs device in reset on .exit() and .suspend()

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Message-ID: <20250226220414.343659-7-peter.griffin@linaro.org>
Date: Wed, 26 Feb 2025 22:04:14 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: alim.akhtar@...sung.com,
	James.Bottomley@...senPartnership.com,
	martin.petersen@...cle.com,
	krzk@...nel.org
Cc: linux-scsi@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	willmcvicker@...gle.com,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	ebiggers@...nel.org,
	bvanassche@....org,
	kernel-team@...roid.com,
	Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH 6/6] scsi: ufs: exynos: put ufs device in reset on .exit() and .suspend()

GPIO_OUT[0] is connected to the reset pin of embedded UFS device.
Before powering off the phy assert the reset signal.

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
 drivers/ufs/host/ufs-exynos.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 4c3e03a3b8d9..64e2bf924213 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -1517,6 +1517,7 @@ static void exynos_ufs_exit(struct ufs_hba *hba)
 {
 	struct exynos_ufs *ufs = ufshcd_get_variant(hba);
 
+	hci_writel(ufs, 0 << 0, HCI_GPIO_OUT);
 	phy_power_off(ufs->phy);
 	phy_exit(ufs->phy);
 }
@@ -1700,6 +1701,8 @@ static int exynos_ufs_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
 	if (status == PRE_CHANGE)
 		return 0;
 
+	hci_writel(ufs, 0 << 0, HCI_GPIO_OUT);
+
 	if (!ufshcd_is_link_active(hba))
 		phy_power_off(ufs->phy);
 
-- 
2.48.1.658.g4767266eb4-goog