linux-kernel - [PATCH V3 3/9] phy: qcom-qmp-ufs: Refactor phy_power_on and phy

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Message-ID: <20250410090102.20781-4-quic_nitirawa@quicinc.com>
Date: Thu, 10 Apr 2025 14:30:56 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: vkoul@...nel.org, kishon@...nel.org, manivannan.sadhasivam@...aro.org,
        James.Bottomley@...senPartnership.com, martin.petersen@...cle.com,
        bvanassche@....org, bjorande@...cinc.com, neil.armstrong@...aro.org,
        konrad.dybcio@....qualcomm.com
Cc: quic_rdwivedi@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, Nitin Rawat <quic_nitirawa@...cinc.com>,
        Can Guo <quic_cang@...cinc.com>
Subject: [PATCH V3 3/9] phy: qcom-qmp-ufs: Refactor phy_power_on and phy_calibrate callbacks

Commit 052553af6a31 ("ufs/phy: qcom: Refactor to use phy_init call")
puts enabling regulators & clks, calibrating UFS PHY, starting serdes
and polling PCS ready status into phy_power_on.

In Current code regulators enable, clks enable, calibrating UFS PHY,
start_serdes and polling PCS_ready_status are part of phy_power_on.

UFS PHY registers are retained after power collapse, meaning calibrating
UFS PHY, start_serdes and polling PCS_ready_status can be done only when
hba is powered_on, and not needed every time when phy_power_on is called
during resume. Hence keep the code which enables PHY's regulators & clks
in phy_power_on and move the rest steps into phy_calibrate function.

Refactor the code to retain PHY regulators & clks in phy_power_on and
move out rest of the code to new phy_calibrate function.

Also move reset_control_assert to qmp_ufs_phy_calibrate to align
with Hardware programming guide.

Co-developed-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 26 ++++++-------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
index bb836bc0f736..636dc3dc3ea8 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
@@ -1796,7 +1796,7 @@ static int qmp_ufs_com_exit(struct qmp_ufs *qmp)
 	return 0;
 }

-static int qmp_ufs_init(struct phy *phy)
+static int qmp_ufs_power_on(struct phy *phy)
 {
 	struct qmp_ufs *qmp = phy_get_drvdata(phy);
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
@@ -1824,10 +1824,6 @@ static int qmp_ufs_init(struct phy *phy)
 				return ret;
 			}
 		}
-
-		ret = reset_control_assert(qmp->ufs_reset);
-		if (ret)
-			return ret;
 	}

 	ret = qmp_ufs_com_init(qmp);
@@ -1846,6 +1842,10 @@ static int qmp_ufs_phy_calibrate(struct phy *phy)
 	unsigned int val;
 	int ret;

+	ret = reset_control_assert(qmp->ufs_reset);
+	if (ret)
+		return ret;
+
 	qmp_ufs_init_registers(qmp, cfg);

 	ret = reset_control_deassert(qmp->ufs_reset);
@@ -1898,21 +1898,6 @@ static int qmp_ufs_exit(struct phy *phy)
 	return 0;
 }

-static int qmp_ufs_power_on(struct phy *phy)
-{
-	int ret;
-
-	ret = qmp_ufs_init(phy);
-	if (ret)
-		return ret;
-
-	ret = qmp_ufs_phy_calibrate(phy);
-	if (ret)
-		qmp_ufs_exit(phy);
-
-	return ret;
-}
-
 static int qmp_ufs_disable(struct phy *phy)
 {
 	int ret;
@@ -1942,6 +1927,7 @@ static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode)
 static const struct phy_ops qcom_qmp_ufs_phy_ops = {
 	.power_on	= qmp_ufs_power_on,
 	.power_off	= qmp_ufs_disable,
+	.calibrate	= qmp_ufs_phy_calibrate,
 	.set_mode	= qmp_ufs_set_mode,
 	.owner		= THIS_MODULE,
 };
--
2.48.1