[PATCH V1 0/2] Refactor phy powerup sequence

[PATCH V1 0/2] Refactor phy powerup sequence

[Nitin Rawat]

Refactor phy_power_on and phy_calibrate callbacks.

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.

Since phy_power_on is separated out from phy calibrate, make separate calls
to phy_power_on and phy_calibrate calls from ufs qcom driver.

Also for better power saving, remove the phy_power_on/off calls from
resume/suspend path and put them to ufs_qcom_setup_clocks, so that
PHY's regulators & clks can be turned on/off along with UFS's clocks.

This patch series is tested on SM8550 MTP, SM8350 MTP and SA8775p.

There is functional dependency between ufs-qcom and phy-qcom-qmp-ufs
and hence both the patches should be part of same merge window.

Nitin Rawat (2):
  scsi: ufs: qcom : Refactor phy_power_on/off calls
  phy: qcom: Refactor phy_power_on and phy_calibrate callbacks

 drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 183 +++++++++---------------
 drivers/ufs/host/ufs-qcom.c             | 104 +++++++++-----
 drivers/ufs/host/ufs-qcom.h             |   4 +
 3 files changed, 139 insertions(+), 152 deletions(-)

--
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[PATCH V1 1/2] scsi: ufs: qcom : Refactor phy_power_on/off calls

[Nitin Rawat]

Commit 3f6d1767b1a0 ("phy: ufs-qcom: Refactor all init steps into
phy_poweron") removes the phy_power_on/off from ufs_qcom_setup_clocks
to suspend/resume func.

To have a better power saving, remove the phy_power_on/off calls from
resume/suspend path and put them back to ufs_qcom_setup_clocks, so that
PHY's regulators & clks can be turned on/off along with UFS's clocks.

Since phy phy_power_on is separated out from phy calibrate, make
separate calls to phy_power_on and phy_calibrate calls from ufs qcom
driver.

Also add a mutex lock to protect the usage of is_phy_pwr_on against
possible racing.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 104 +++++++++++++++++++++++-------------
 drivers/ufs/host/ufs-qcom.h |   4 ++
 2 files changed, 72 insertions(+), 36 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 39eef470f8fa..2721a30f0db8 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -338,6 +338,46 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
 	return UFS_HS_G3;
 }

+static int ufs_qcom_phy_power_on(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct phy *phy = host->generic_phy;
+	int ret = 0;
+
+	mutex_lock(&host->phy_mutex);
+	if (!host->is_phy_pwr_on) {
+		ret = phy_power_on(phy);
+		if (ret) {
+			mutex_unlock(&host->phy_mutex);
+			return ret;
+		}
+		host->is_phy_pwr_on = true;
+	}
+	mutex_unlock(&host->phy_mutex);
+
+	return ret;
+}
+
+static int ufs_qcom_phy_power_off(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct phy *phy = host->generic_phy;
+	int ret = 0;
+
+	mutex_lock(&host->phy_mutex);
+	if (host->is_phy_pwr_on) {
+		ret = phy_power_off(phy);
+		if (ret) {
+			mutex_unlock(&host->phy_mutex);
+			return ret;
+		}
+		host->is_phy_pwr_on = false;
+	}
+	mutex_unlock(&host->phy_mutex);
+
+	return ret;
+}
+
 static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -378,13 +418,18 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 		goto out_disable_phy;

 	/* power on phy - start serdes and phy's power and clocks */
-	ret = phy_power_on(phy);
+	ret = ufs_qcom_phy_power_on(hba);
 	if (ret) {
 		dev_err(hba->dev, "%s: phy power on failed, ret = %d\n",
 			__func__, ret);
 		goto out_disable_phy;
 	}

+	ret = phy_calibrate(phy);
+	if (ret) {
+		dev_err(hba->dev, "%s: Failed to calibrate PHY %d\n",
+				  __func__, ret);
+	}
 	ufs_qcom_select_unipro_mode(host);

 	return 0;
@@ -557,26 +602,17 @@ static int ufs_qcom_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
 	enum ufs_notify_change_status status)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	struct phy *phy = host->generic_phy;

 	if (status == PRE_CHANGE)
 		return 0;

-	if (ufs_qcom_is_link_off(hba)) {
-		/*
-		 * Disable the tx/rx lane symbol clocks before PHY is
-		 * powered down as the PLL source should be disabled
-		 * after downstream clocks are disabled.
-		 */
+	if (!ufs_qcom_is_link_active(hba))
 		ufs_qcom_disable_lane_clks(host);
-		phy_power_off(phy);

-		/* reset the connected UFS device during power down */
-		ufs_qcom_device_reset_ctrl(hba, true);

-	} else if (!ufs_qcom_is_link_active(hba)) {
-		ufs_qcom_disable_lane_clks(host);
-	}
+	/* reset the connected UFS device during power down */
+	if (ufs_qcom_is_link_off(hba) && host->device_reset)
+		ufs_qcom_device_reset_ctrl(hba, true);

 	return ufs_qcom_ice_suspend(host);
 }
@@ -584,26 +620,11 @@ static int ufs_qcom_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
 static int ufs_qcom_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	struct phy *phy = host->generic_phy;
 	int err;

-	if (ufs_qcom_is_link_off(hba)) {
-		err = phy_power_on(phy);
-		if (err) {
-			dev_err(hba->dev, "%s: failed PHY power on: %d\n",
-				__func__, err);
-			return err;
-		}
-
-		err = ufs_qcom_enable_lane_clks(host);
-		if (err)
-			return err;
-
-	} else if (!ufs_qcom_is_link_active(hba)) {
-		err = ufs_qcom_enable_lane_clks(host);
-		if (err)
-			return err;
-	}
+	err = ufs_qcom_enable_lane_clks(host);
+	if (err)
+		return err;

 	return ufs_qcom_ice_resume(host);
 }
@@ -908,6 +929,7 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
 				 enum ufs_notify_change_status status)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	int err;

 	/*
 	 * In case ufs_qcom_init() is not yet done, simply ignore.
@@ -926,10 +948,22 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
 				/* disable device ref_clk */
 				ufs_qcom_dev_ref_clk_ctrl(host, false);
 			}
+			err = ufs_qcom_phy_power_off(hba);
+			if (err) {
+				dev_err(hba->dev, "%s: phy power off failed, ret=%d\n",
+						__func__, err);
+					return err;
+			}
 		}
 		break;
 	case POST_CHANGE:
 		if (on) {
+			err = ufs_qcom_phy_power_on(hba);
+			if (err) {
+				dev_err(hba->dev, "%s: phy power on failed, ret = %d\n",
+						__func__, err);
+				return err;
+			}
 			/* enable the device ref clock for HS mode*/
 			if (ufshcd_is_hs_mode(&hba->pwr_info))
 				ufs_qcom_dev_ref_clk_ctrl(host, true);
@@ -1110,7 +1144,7 @@ static void ufs_qcom_exit(struct ufs_hba *hba)
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);

 	ufs_qcom_disable_lane_clks(host);
-	phy_power_off(host->generic_phy);
+	ufs_qcom_phy_power_off(hba);
 	phy_exit(host->generic_phy);
 }

@@ -1536,9 +1570,7 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,

 static void ufs_qcom_reinit_notify(struct ufs_hba *hba)
 {
-	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-
-	phy_power_off(host->generic_phy);
+	ufs_qcom_phy_power_off(hba);
 }

 /* Resources */
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 9dd9a391ebb7..241dba01672e 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -215,6 +215,10 @@ struct ufs_qcom_host {
 	u32 phy_gear;

 	bool esi_enabled;
+	/* flag to check if phy is powered on */
+	bool is_phy_pwr_on;
+	/* Protect the usage of is_phy_pwr_on against racing */
+	struct mutex phy_mutex;
 };

 static inline u32
--
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[PATCH V1 2/2] phy: qcom: Refactor phy_power_on and phy_calibrate callbacks

[Nitin Rawat]

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 enable PHY regulators & clks in phy_power_on and
move rest of the code to phy_calibrate function.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 183 +++++++++---------------
 1 file changed, 67 insertions(+), 116 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
index 3c2e6255e26f..ae0218738b0b 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
@@ -32,14 +32,15 @@
 /* QPHY_SW_RESET bit */
 #define SW_RESET				BIT(0)
 /* QPHY_POWER_DOWN_CONTROL */
-#define SW_PWRDN				BIT(0)
+#define SW_PWRUP				BIT(0)
+#define SW_PWRDN				0
 /* QPHY_START_CONTROL bits */
 #define SERDES_START				BIT(0)
 #define PCS_START				BIT(1)
 /* QPHY_PCS_READY_STATUS bit */
 #define PCS_READY				BIT(0)

-#define PHY_INIT_COMPLETE_TIMEOUT		10000
+#define PHY_INIT_COMPLETE_TIMEOUT		1000000

 struct qmp_phy_init_tbl {
 	unsigned int offset;
@@ -1464,8 +1465,25 @@ static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg
 		qmp_ufs_pcs_init(qmp, &cfg->tbls_hs_g4);
 }

-static int qmp_ufs_com_init(struct qmp_ufs *qmp)
+static int qmp_ufs_power_off(struct phy *phy)
+{
+	struct qmp_ufs *qmp = phy_get_drvdata(phy);
+	const struct qmp_phy_cfg *cfg = qmp->cfg;
+
+	/* Put PHY into POWER DOWN state: active low */
+	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
+			SW_PWRDN);
+
+	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
+
+	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
+
+	return 0;
+}
+
+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;
 	void __iomem *pcs = qmp->pcs;
 	int ret;
@@ -1480,8 +1498,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
 	if (ret)
 		goto err_disable_regulators;

-	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN);
-
+	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP);
 	return 0;

 err_disable_regulators:
@@ -1490,61 +1507,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
 	return ret;
 }

-static int qmp_ufs_com_exit(struct qmp_ufs *qmp)
-{
-	const struct qmp_phy_cfg *cfg = qmp->cfg;
-
-	reset_control_assert(qmp->ufs_reset);
-
-	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
-
-	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
-
-	return 0;
-}
-
-static int qmp_ufs_init(struct phy *phy)
-{
-	struct qmp_ufs *qmp = phy_get_drvdata(phy);
-	const struct qmp_phy_cfg *cfg = qmp->cfg;
-	int ret;
-	dev_vdbg(qmp->dev, "Initializing QMP phy\n");
-
-	if (cfg->no_pcs_sw_reset) {
-		/*
-		 * Get UFS reset, which is delayed until now to avoid a
-		 * circular dependency where UFS needs its PHY, but the PHY
-		 * needs this UFS reset.
-		 */
-		if (!qmp->ufs_reset) {
-			qmp->ufs_reset =
-				devm_reset_control_get_exclusive(qmp->dev,
-								 "ufsphy");
-
-			if (IS_ERR(qmp->ufs_reset)) {
-				ret = PTR_ERR(qmp->ufs_reset);
-				dev_err(qmp->dev,
-					"failed to get UFS reset: %d\n",
-					ret);
-
-				qmp->ufs_reset = NULL;
-				return ret;
-			}
-		}
-
-		ret = reset_control_assert(qmp->ufs_reset);
-		if (ret)
-			return ret;
-	}
-
-	ret = qmp_ufs_com_init(qmp);
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
-static int qmp_ufs_power_on(struct phy *phy)
+static int qmp_ufs_phy_calibrate(struct phy *phy)
 {
 	struct qmp_ufs *qmp = phy_get_drvdata(phy);
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
@@ -1553,11 +1516,21 @@ static int qmp_ufs_power_on(struct phy *phy)
 	unsigned int val;
 	int ret;

+	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP);
+
+	ret = reset_control_assert(qmp->ufs_reset);
+	if (ret) {
+		dev_err(qmp->dev, "Failed to assert UFS PHY reset %d\n", ret);
+		return ret;
+	}
+
 	qmp_ufs_init_registers(qmp, cfg);

 	ret = reset_control_deassert(qmp->ufs_reset);
-	if (ret)
+	if (ret) {
+		dev_err(qmp->dev, "Failed to deassert UFS PHY reset %d\n", ret);
 		return ret;
+	}

 	/* Pull PHY out of reset state */
 	if (!cfg->no_pcs_sw_reset)
@@ -1577,59 +1550,6 @@ static int qmp_ufs_power_on(struct phy *phy)
 	return 0;
 }

-static int qmp_ufs_power_off(struct phy *phy)
-{
-	struct qmp_ufs *qmp = phy_get_drvdata(phy);
-	const struct qmp_phy_cfg *cfg = qmp->cfg;
-
-	/* PHY reset */
-	if (!cfg->no_pcs_sw_reset)
-		qphy_setbits(qmp->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
-
-	/* stop SerDes */
-	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_START_CTRL], SERDES_START);
-
-	/* Put PHY into POWER DOWN state: active low */
-	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
-			SW_PWRDN);
-
-	return 0;
-}
-
-static int qmp_ufs_exit(struct phy *phy)
-{
-	struct qmp_ufs *qmp = phy_get_drvdata(phy);
-
-	qmp_ufs_com_exit(qmp);
-
-	return 0;
-}
-
-static int qmp_ufs_enable(struct phy *phy)
-{
-	int ret;
-
-	ret = qmp_ufs_init(phy);
-	if (ret)
-		return ret;
-
-	ret = qmp_ufs_power_on(phy);
-	if (ret)
-		qmp_ufs_exit(phy);
-
-	return ret;
-}
-
-static int qmp_ufs_disable(struct phy *phy)
-{
-	int ret;
-
-	ret = qmp_ufs_power_off(phy);
-	if (ret)
-		return ret;
-	return qmp_ufs_exit(phy);
-}
-
 static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode)
 {
 	struct qmp_ufs *qmp = phy_get_drvdata(phy);
@@ -1641,9 +1561,10 @@ 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_enable,
-	.power_off	= qmp_ufs_disable,
+	.power_on	= qmp_ufs_power_on,
+	.power_off	= qmp_ufs_power_off,
 	.set_mode	= qmp_ufs_set_mode,
+	.calibrate	= qmp_ufs_phy_calibrate,
 	.owner		= THIS_MODULE,
 };

@@ -1809,6 +1730,32 @@ static int qmp_ufs_parse_dt(struct qmp_ufs *qmp)
 	return 0;
 }

+static int qmp_ufs_get_phy_reset(struct qmp_ufs *qmp)
+{
+	const struct qmp_phy_cfg *cfg = qmp->cfg;
+	int ret;
+
+	if (!cfg->no_pcs_sw_reset)
+		return 0;
+
+	/*
+	 * Get UFS reset, which is delayed until now to avoid a
+	 * circular dependency where UFS needs its PHY, but the PHY
+	 * needs this UFS reset.
+	 */
+
+	qmp->ufs_reset = devm_reset_control_get_exclusive(qmp->dev,
+							  "ufsphy");
+	if (IS_ERR(qmp->ufs_reset)) {
+		ret = PTR_ERR(qmp->ufs_reset);
+		dev_err(qmp->dev, "failed to get UFS reset: %d\n", ret);
+		qmp->ufs_reset = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
 static int qmp_ufs_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1835,6 +1782,10 @@ static int qmp_ufs_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;

+	ret = qmp_ufs_get_phy_reset(qmp);
+	if (ret)
+		return ret;
+
 	/* Check for legacy binding with child node. */
 	np = of_get_next_available_child(dev->of_node, NULL);
 	if (np) {
--
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Re: [PATCH V1 1/2] scsi: ufs: qcom : Refactor phy_power_on/off calls

[Konrad Dybcio]

On 12.01.2024 16:33, Nitin Rawat wrote:
> Commit 3f6d1767b1a0 ("phy: ufs-qcom: Refactor all init steps into
> phy_poweron") removes the phy_power_on/off from ufs_qcom_setup_clocks
> to suspend/resume func.
> 
> To have a better power saving, remove the phy_power_on/off calls from
> resume/suspend path and put them back to ufs_qcom_setup_clocks, so that
> PHY's regulators & clks can be turned on/off along with UFS's clocks.
> 
> Since phy phy_power_on is separated out from phy calibrate, make
> separate calls to phy_power_on and phy_calibrate calls from ufs qcom
> driver.
> 
> Also add a mutex lock to protect the usage of is_phy_pwr_on against
> possible racing.
> 
> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
> ---
>  drivers/ufs/host/ufs-qcom.c | 104 +++++++++++++++++++++++-------------
>  drivers/ufs/host/ufs-qcom.h |   4 ++
>  2 files changed, 72 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 39eef470f8fa..2721a30f0db8 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -338,6 +338,46 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
>  	return UFS_HS_G3;
>  }
> 
> +static int ufs_qcom_phy_power_on(struct ufs_hba *hba)
> +{
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +	struct phy *phy = host->generic_phy;
> +	int ret = 0;
> +
> +	mutex_lock(&host->phy_mutex);

guard(mutex)(&host->phy_mutex);

and you can drop the _unlock calls

> +	if (!host->is_phy_pwr_on) {
> +		ret = phy_power_on(phy);
> +		if (ret) {
> +			mutex_unlock(&host->phy_mutex);
> +			return ret;

And with the _unlock now being unnecessary, you can rewrite this
as:

if (!host->is_phy_pwr_on) {
	ret = phy_power_on(phy);
	if (!ret)
		host->is_phy_pwr_on = true;
}

return ret
> +		}
> +		host->is_phy_pwr_on = true;
> +	}
> +	mutex_unlock(&host->phy_mutex);
> +
> +	return ret;
> +}

[...]

>  static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>  {
>  	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> @@ -378,13 +418,18 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>  		goto out_disable_phy;
> 
>  	/* power on phy - start serdes and phy's power and clocks */
> -	ret = phy_power_on(phy);
> +	ret = ufs_qcom_phy_power_on(hba);
>  	if (ret) {
>  		dev_err(hba->dev, "%s: phy power on failed, ret = %d\n",
>  			__func__, ret);
>  		goto out_disable_phy;
>  	}
> 
> +	ret = phy_calibrate(phy);
> +	if (ret) {
> +		dev_err(hba->dev, "%s: Failed to calibrate PHY %d\n",
> +				  __func__, ret);
> +	}

You can drop the overly verbose __func__, unwrap the line and remove the
curly braces, similar for dev_err-s below

Actually, shouldn't this error out if calibrate fails??

Konrad

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Re: [PATCH V1 2/2] phy: qcom: Refactor phy_power_on and phy_calibrate callbacks

[Vinod Koul]

On 12-01-24, 21:03, Nitin Rawat wrote:
> 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 enable PHY regulators & clks in phy_power_on and
> move rest of the code to phy_calibrate function.
> 
> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 183 +++++++++---------------
>  1 file changed, 67 insertions(+), 116 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> index 3c2e6255e26f..ae0218738b0b 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> @@ -32,14 +32,15 @@
>  /* QPHY_SW_RESET bit */
>  #define SW_RESET				BIT(0)
>  /* QPHY_POWER_DOWN_CONTROL */
> -#define SW_PWRDN				BIT(0)
> +#define SW_PWRUP				BIT(0)
> +#define SW_PWRDN				0

why change this? so which bit is for PWR control, it is still bit 0
right?

>  /* QPHY_START_CONTROL bits */
>  #define SERDES_START				BIT(0)
>  #define PCS_START				BIT(1)
>  /* QPHY_PCS_READY_STATUS bit */
>  #define PCS_READY				BIT(0)
> 
> -#define PHY_INIT_COMPLETE_TIMEOUT		10000
> +#define PHY_INIT_COMPLETE_TIMEOUT		1000000

why change timeout? this should be explained in log, even better a
individual patch explaining why this was changed

> 
>  struct qmp_phy_init_tbl {
>  	unsigned int offset;
> @@ -1464,8 +1465,25 @@ static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg
>  		qmp_ufs_pcs_init(qmp, &cfg->tbls_hs_g4);
>  }
> 
> -static int qmp_ufs_com_init(struct qmp_ufs *qmp)
> +static int qmp_ufs_power_off(struct phy *phy)
> +{
> +	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> +	const struct qmp_phy_cfg *cfg = qmp->cfg;
> +
> +	/* Put PHY into POWER DOWN state: active low */
> +	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> +			SW_PWRDN);

this will clear the bit, i think you are interpreting this as right
which this is not

> +
> +	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
> +
> +	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
> +
> +	return 0;
> +}
> +
> +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;
>  	void __iomem *pcs = qmp->pcs;
>  	int ret;
> @@ -1480,8 +1498,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
>  	if (ret)
>  		goto err_disable_regulators;
> 
> -	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN);
> -
> +	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP);


>  	return 0;
> 
>  err_disable_regulators:
> @@ -1490,61 +1507,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
>  	return ret;
>  }
> 
> -static int qmp_ufs_com_exit(struct qmp_ufs *qmp)
> -{
> -	const struct qmp_phy_cfg *cfg = qmp->cfg;
> -
> -	reset_control_assert(qmp->ufs_reset);
> -
> -	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
> -
> -	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
> -
> -	return 0;
> -}
> -
> -static int qmp_ufs_init(struct phy *phy)
> -{
> -	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> -	const struct qmp_phy_cfg *cfg = qmp->cfg;
> -	int ret;
> -	dev_vdbg(qmp->dev, "Initializing QMP phy\n");
> -
> -	if (cfg->no_pcs_sw_reset) {
> -		/*
> -		 * Get UFS reset, which is delayed until now to avoid a
> -		 * circular dependency where UFS needs its PHY, but the PHY
> -		 * needs this UFS reset.
> -		 */
> -		if (!qmp->ufs_reset) {
> -			qmp->ufs_reset =
> -				devm_reset_control_get_exclusive(qmp->dev,
> -								 "ufsphy");
> -
> -			if (IS_ERR(qmp->ufs_reset)) {
> -				ret = PTR_ERR(qmp->ufs_reset);
> -				dev_err(qmp->dev,
> -					"failed to get UFS reset: %d\n",
> -					ret);
> -
> -				qmp->ufs_reset = NULL;
> -				return ret;
> -			}
> -		}
> -
> -		ret = reset_control_assert(qmp->ufs_reset);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	ret = qmp_ufs_com_init(qmp);
> -	if (ret)
> -		return ret;
> -
> -	return 0;
> -}
> -
> -static int qmp_ufs_power_on(struct phy *phy)
> +static int qmp_ufs_phy_calibrate(struct phy *phy)
>  {
>  	struct qmp_ufs *qmp = phy_get_drvdata(phy);
>  	const struct qmp_phy_cfg *cfg = qmp->cfg;
> @@ -1553,11 +1516,21 @@ static int qmp_ufs_power_on(struct phy *phy)
>  	unsigned int val;
>  	int ret;
> 
> +	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP);
> +
> +	ret = reset_control_assert(qmp->ufs_reset);
> +	if (ret) {
> +		dev_err(qmp->dev, "Failed to assert UFS PHY reset %d\n", ret);
> +		return ret;
> +	}
> +
>  	qmp_ufs_init_registers(qmp, cfg);
> 
>  	ret = reset_control_deassert(qmp->ufs_reset);
> -	if (ret)
> +	if (ret) {
> +		dev_err(qmp->dev, "Failed to deassert UFS PHY reset %d\n", ret);
>  		return ret;
> +	}
> 
>  	/* Pull PHY out of reset state */
>  	if (!cfg->no_pcs_sw_reset)
> @@ -1577,59 +1550,6 @@ static int qmp_ufs_power_on(struct phy *phy)
>  	return 0;
>  }
> 
> -static int qmp_ufs_power_off(struct phy *phy)
> -{
> -	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> -	const struct qmp_phy_cfg *cfg = qmp->cfg;
> -
> -	/* PHY reset */
> -	if (!cfg->no_pcs_sw_reset)
> -		qphy_setbits(qmp->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
> -
> -	/* stop SerDes */
> -	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_START_CTRL], SERDES_START);
> -
> -	/* Put PHY into POWER DOWN state: active low */
> -	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> -			SW_PWRDN);
> -
> -	return 0;
> -}
> -
> -static int qmp_ufs_exit(struct phy *phy)
> -{
> -	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> -
> -	qmp_ufs_com_exit(qmp);
> -
> -	return 0;
> -}
> -
> -static int qmp_ufs_enable(struct phy *phy)
> -{
> -	int ret;
> -
> -	ret = qmp_ufs_init(phy);
> -	if (ret)
> -		return ret;
> -
> -	ret = qmp_ufs_power_on(phy);
> -	if (ret)
> -		qmp_ufs_exit(phy);
> -
> -	return ret;
> -}
> -
> -static int qmp_ufs_disable(struct phy *phy)
> -{
> -	int ret;
> -
> -	ret = qmp_ufs_power_off(phy);
> -	if (ret)
> -		return ret;
> -	return qmp_ufs_exit(phy);
> -}
> -
>  static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode)
>  {
>  	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> @@ -1641,9 +1561,10 @@ 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_enable,
> -	.power_off	= qmp_ufs_disable,
> +	.power_on	= qmp_ufs_power_on,
> +	.power_off	= qmp_ufs_power_off,
>  	.set_mode	= qmp_ufs_set_mode,
> +	.calibrate	= qmp_ufs_phy_calibrate,
>  	.owner		= THIS_MODULE,
>  };
> 
> @@ -1809,6 +1730,32 @@ static int qmp_ufs_parse_dt(struct qmp_ufs *qmp)
>  	return 0;
>  }
> 
> +static int qmp_ufs_get_phy_reset(struct qmp_ufs *qmp)
> +{
> +	const struct qmp_phy_cfg *cfg = qmp->cfg;
> +	int ret;
> +
> +	if (!cfg->no_pcs_sw_reset)
> +		return 0;
> +
> +	/*
> +	 * Get UFS reset, which is delayed until now to avoid a
> +	 * circular dependency where UFS needs its PHY, but the PHY
> +	 * needs this UFS reset.
> +	 */
> +
> +	qmp->ufs_reset = devm_reset_control_get_exclusive(qmp->dev,
> +							  "ufsphy");
> +	if (IS_ERR(qmp->ufs_reset)) {
> +		ret = PTR_ERR(qmp->ufs_reset);
> +		dev_err(qmp->dev, "failed to get UFS reset: %d\n", ret);
> +		qmp->ufs_reset = NULL;
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int qmp_ufs_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -1835,6 +1782,10 @@ static int qmp_ufs_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
> 
> +	ret = qmp_ufs_get_phy_reset(qmp);
> +	if (ret)
> +		return ret;
> +

I think this patch should be split to moving code around to helper fn
and then add logic for moving power up/down calls, pls dont mix
everything in single patch


>  	/* Check for legacy binding with child node. */
>  	np = of_get_next_available_child(dev->of_node, NULL);
>  	if (np) {
> --
> 2.43.0

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Re: [PATCH V1 1/2] scsi: ufs: qcom : Refactor phy_power_on/off calls

[Manivannan Sadhasivam]

On Fri, Jan 12, 2024 at 09:03:47PM +0530, Nitin Rawat wrote:
> Commit 3f6d1767b1a0 ("phy: ufs-qcom: Refactor all init steps into
> phy_poweron") removes the phy_power_on/off from ufs_qcom_setup_clocks

s/removes/moved

> to suspend/resume func.
> 
> To have a better power saving, remove the phy_power_on/off calls from
> resume/suspend path and put them back to ufs_qcom_setup_clocks, so that
> PHY's regulators & clks can be turned on/off along with UFS's clocks.
> 
> Since phy phy_power_on is separated out from phy calibrate, make
> separate calls to phy_power_on and phy_calibrate calls from ufs qcom
> driver.
> 

Above change should be in a separate patch.

> Also add a mutex lock to protect the usage of is_phy_pwr_on against
> possible racing.
> 
> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
> ---
>  drivers/ufs/host/ufs-qcom.c | 104 +++++++++++++++++++++++-------------
>  drivers/ufs/host/ufs-qcom.h |   4 ++
>  2 files changed, 72 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 39eef470f8fa..2721a30f0db8 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -338,6 +338,46 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
>  	return UFS_HS_G3;
>  }
> 
> +static int ufs_qcom_phy_power_on(struct ufs_hba *hba)
> +{
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +	struct phy *phy = host->generic_phy;
> +	int ret = 0;
> +
> +	mutex_lock(&host->phy_mutex);

You do not need mutex to protect a variable. If you want to ensure that the
access to the flag is atomic, you can use test_and_{set/clear}_bit helpers.

> +	if (!host->is_phy_pwr_on) {
> +		ret = phy_power_on(phy);
> +		if (ret) {
> +			mutex_unlock(&host->phy_mutex);
> +			return ret;
> +		}
> +		host->is_phy_pwr_on = true;
> +	}
> +	mutex_unlock(&host->phy_mutex);
> +
> +	return ret;
> +}
> +
> +static int ufs_qcom_phy_power_off(struct ufs_hba *hba)
> +{
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +	struct phy *phy = host->generic_phy;
> +	int ret = 0;
> +
> +	mutex_lock(&host->phy_mutex);
> +	if (host->is_phy_pwr_on) {
> +		ret = phy_power_off(phy);
> +		if (ret) {
> +			mutex_unlock(&host->phy_mutex);
> +			return ret;
> +		}
> +		host->is_phy_pwr_on = false;
> +	}
> +	mutex_unlock(&host->phy_mutex);
> +
> +	return ret;
> +}
> +
>  static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>  {
>  	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> @@ -378,13 +418,18 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>  		goto out_disable_phy;
> 
>  	/* power on phy - start serdes and phy's power and clocks */
> -	ret = phy_power_on(phy);
> +	ret = ufs_qcom_phy_power_on(hba);
>  	if (ret) {
>  		dev_err(hba->dev, "%s: phy power on failed, ret = %d\n",
>  			__func__, ret);
>  		goto out_disable_phy;
>  	}
> 
> +	ret = phy_calibrate(phy);
> +	if (ret) {
> +		dev_err(hba->dev, "%s: Failed to calibrate PHY %d\n",
> +				  __func__, ret);

Even though the driver already has a lot of "__func__" to print the function
names in error log, please do not add more. I will get rid of the existing ones
at some point.

- Mani

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Re: [PATCH V1 2/2] phy: qcom: Refactor phy_power_on and phy_calibrate callbacks

[Manivannan Sadhasivam]

On Fri, Jan 12, 2024 at 09:03:48PM +0530, Nitin Rawat wrote:
> 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 enable PHY regulators & clks in phy_power_on and
> move rest of the code to phy_calibrate function.
> 

This patch should come before UFS patch since you are introducing the
calibrate() callback here only.

> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 183 +++++++++---------------
>  1 file changed, 67 insertions(+), 116 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> index 3c2e6255e26f..ae0218738b0b 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> @@ -32,14 +32,15 @@
>  /* QPHY_SW_RESET bit */
>  #define SW_RESET				BIT(0)
>  /* QPHY_POWER_DOWN_CONTROL */
> -#define SW_PWRDN				BIT(0)
> +#define SW_PWRUP				BIT(0)
> +#define SW_PWRDN				0

Why 0?

>  /* QPHY_START_CONTROL bits */
>  #define SERDES_START				BIT(0)
>  #define PCS_START				BIT(1)
>  /* QPHY_PCS_READY_STATUS bit */
>  #define PCS_READY				BIT(0)
> 
> -#define PHY_INIT_COMPLETE_TIMEOUT		10000
> +#define PHY_INIT_COMPLETE_TIMEOUT		1000000

Why? This is not mentioned in the commit message. If it is not related to this
refactoring, then it should be a separate patch with justification.

> 
>  struct qmp_phy_init_tbl {
>  	unsigned int offset;
> @@ -1464,8 +1465,25 @@ static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg
>  		qmp_ufs_pcs_init(qmp, &cfg->tbls_hs_g4);
>  }
> 
> -static int qmp_ufs_com_init(struct qmp_ufs *qmp)
> +static int qmp_ufs_power_off(struct phy *phy)
> +{
> +	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> +	const struct qmp_phy_cfg *cfg = qmp->cfg;
> +
> +	/* Put PHY into POWER DOWN state: active low */
> +	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> +			SW_PWRDN);
> +
> +	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
> +
> +	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
> +
> +	return 0;
> +}
> +
> +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;
>  	void __iomem *pcs = qmp->pcs;
>  	int ret;
> @@ -1480,8 +1498,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
>  	if (ret)
>  		goto err_disable_regulators;
> 
> -	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN);
> -
> +	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP);

Newline please. As mentioned above, why can't you use existing SW_PWRDN macro.

>  	return 0;
> 
>  err_disable_regulators:
> @@ -1490,61 +1507,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp)
>  	return ret;
>  }
> 

[...]

> +static int qmp_ufs_get_phy_reset(struct qmp_ufs *qmp)
> +{
> +	const struct qmp_phy_cfg *cfg = qmp->cfg;
> +	int ret;
> +
> +	if (!cfg->no_pcs_sw_reset)
> +		return 0;
> +
> +	/*
> +	 * Get UFS reset, which is delayed until now to avoid a
> +	 * circular dependency where UFS needs its PHY, but the PHY
> +	 * needs this UFS reset.
> +	 */
> +
> +	qmp->ufs_reset = devm_reset_control_get_exclusive(qmp->dev,
> +							  "ufsphy");

You have moved this to probe from power_on() without any justification. What
about the circular dependency mentioned in the comment.

- Mani

-- 
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