ufs/phy: qcom: Refactor to use phy_init call

Refactor ufs_qcom_power_up_sequence() to get rid of ugly
exported phy APIs and use the phy_init() and phy_power_on()
to do the phy initialization.

Signed-off-by: Vivek Gautam <[e-mail]>
Reviewed-by: Subhash Jadavani <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/qualcomm/phy-qcom-ufs-i.h

···
 	struct ufs_qcom_phy_calibration *cached_regs;
 	int cached_regs_table_size;
 	bool is_powered_on;
+	bool is_started;
 	struct ufs_qcom_phy_specific_ops *phy_spec_ops;
 
 	enum phy_mode mode;
···
  * struct ufs_qcom_phy_specific_ops - set of pointers to functions which have a
  * specific implementation per phy. Each UFS phy, should implement
  * those functions according to its spec and requirements
- * @calibrate_phy: pointer to a function that calibrate the phy
  * @start_serdes: pointer to a function that starts the serdes
  * @is_physical_coding_sublayer_ready: pointer to a function that
  * checks pcs readiness. returns 0 for success and non-zero for error.
···
  * and writes to QSERDES_RX_SIGDET_CNTRL attribute
  */
 struct ufs_qcom_phy_specific_ops {
-	int (*calibrate_phy)(struct ufs_qcom_phy *phy, bool is_rate_B);
 	void (*start_serdes)(struct ufs_qcom_phy *phy);
 	int (*is_physical_coding_sublayer_ready)(struct ufs_qcom_phy *phy);
 	void (*set_tx_lane_enable)(struct ufs_qcom_phy *phy, u32 val);

drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c

···
 
 static int ufs_qcom_phy_qmp_14nm_init(struct phy *generic_phy)
 {
-	return 0;
+	struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
+	bool is_rate_B = false;
+	int ret;
+
+	if (phy_common->mode == PHY_MODE_UFS_HS_B)
+		is_rate_B = true;
+
+	ret = ufs_qcom_phy_qmp_14nm_phy_calibrate(phy_common, is_rate_B);
+	if (!ret)
+		/* phy calibrated, but yet to be started */
+		phy_common->is_started = false;
+
+	return ret;
 }
 
 static int ufs_qcom_phy_qmp_14nm_exit(struct phy *generic_phy)
···
 };
 
 static struct ufs_qcom_phy_specific_ops phy_14nm_ops = {
-	.calibrate_phy		= ufs_qcom_phy_qmp_14nm_phy_calibrate,
 	.start_serdes		= ufs_qcom_phy_qmp_14nm_start_serdes,
 	.is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_14nm_is_pcs_ready,
 	.set_tx_lane_enable	= ufs_qcom_phy_qmp_14nm_set_tx_lane_enable,

drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c

···
 
 static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
 {
-	return 0;
+	struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
+	bool is_rate_B = false;
+	int ret;
+
+	if (phy_common->mode == PHY_MODE_UFS_HS_B)
+		is_rate_B = true;
+
+	ret = ufs_qcom_phy_qmp_20nm_phy_calibrate(phy_common, is_rate_B);
+	if (!ret)
+		/* phy calibrated, but yet to be started */
+		phy_common->is_started = false;
+
+	return ret;
 }
 
 static int ufs_qcom_phy_qmp_20nm_exit(struct phy *generic_phy)
···
 };
 
 static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
-	.calibrate_phy		= ufs_qcom_phy_qmp_20nm_phy_calibrate,
 	.start_serdes		= ufs_qcom_phy_qmp_20nm_start_serdes,
 	.is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
 	.set_tx_lane_enable	= ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,

drivers/phy/qualcomm/phy-qcom-ufs.c

···
 	}
 }
 
-int ufs_qcom_phy_start_serdes(struct phy *generic_phy)
+static int ufs_qcom_phy_start_serdes(struct ufs_qcom_phy *ufs_qcom_phy)
 {
-	struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 	int ret = 0;
 
 	if (!ufs_qcom_phy->phy_spec_ops->start_serdes) {
···
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(ufs_qcom_phy_start_serdes);
 
 int ufs_qcom_phy_set_tx_lane_enable(struct phy *generic_phy, u32 tx_lanes)
 {
···
 }
 EXPORT_SYMBOL_GPL(ufs_qcom_phy_save_controller_version);
 
-int ufs_qcom_phy_calibrate_phy(struct phy *generic_phy, bool is_rate_B)
+static int ufs_qcom_phy_is_pcs_ready(struct ufs_qcom_phy *ufs_qcom_phy)
 {
-	struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
-	int ret = 0;
-
-	if (!ufs_qcom_phy->phy_spec_ops->calibrate_phy) {
-		dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy() callback is not supported\n",
-			__func__);
-		ret = -ENOTSUPP;
-	} else {
-		ret = ufs_qcom_phy->phy_spec_ops->
-				calibrate_phy(ufs_qcom_phy, is_rate_B);
-		if (ret)
-			dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy() failed %d\n",
-				__func__, ret);
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(ufs_qcom_phy_calibrate_phy);
-
-int ufs_qcom_phy_is_pcs_ready(struct phy *generic_phy)
-{
-	struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
-
 	if (!ufs_qcom_phy->phy_spec_ops->is_physical_coding_sublayer_ready) {
 		dev_err(ufs_qcom_phy->dev, "%s: is_physical_coding_sublayer_ready() callback is not supported\n",
 			__func__);
···
 	return ufs_qcom_phy->phy_spec_ops->
 			is_physical_coding_sublayer_ready(ufs_qcom_phy);
 }
-EXPORT_SYMBOL_GPL(ufs_qcom_phy_is_pcs_ready);
 
 int ufs_qcom_phy_power_on(struct phy *generic_phy)
 {
···
 
 	if (phy_common->is_powered_on)
 		return 0;
+
+	if (!phy_common->is_started) {
+		err = ufs_qcom_phy_start_serdes(phy_common);
+		if (err)
+			return err;
+
+		err = ufs_qcom_phy_is_pcs_ready(phy_common);
+		if (err)
+			return err;
+
+		phy_common->is_started = true;
+	}
 
 	err = ufs_qcom_phy_enable_vreg(dev, &phy_common->vdda_phy);
 	if (err) {

drivers/scsi/ufs/ufs-qcom.c

···
 	/* provide 1ms delay to let the reset pulse propagate */
 	usleep_range(1000, 1100);
 
-	ret = ufs_qcom_phy_calibrate_phy(phy, is_rate_B);
-
+	/* phy initialization - calibrate the phy */
+	ret = phy_init(phy);
 	if (ret) {
-		dev_err(hba->dev, "%s: ufs_qcom_phy_calibrate_phy() failed, ret = %d\n",
+		dev_err(hba->dev, "%s: phy init failed, ret = %d\n",
 			__func__, ret);
 		goto out;
 	}
···
 	 * voltage, current to settle down before starting serdes.
 	 */
 	usleep_range(1000, 1100);
-	ret = ufs_qcom_phy_start_serdes(phy);
-	if (ret) {
-		dev_err(hba->dev, "%s: ufs_qcom_phy_start_serdes() failed, ret = %d\n",
-			__func__, ret);
-		goto out;
-	}
 
-	ret = ufs_qcom_phy_is_pcs_ready(phy);
-	if (ret)
-		dev_err(hba->dev,
-			"%s: is_physical_coding_sublayer_ready() failed, ret = %d\n",
+	/* power on phy - start serdes and phy's power and clocks */
+	ret = phy_power_on(phy);
+	if (ret) {
+		dev_err(hba->dev, "%s: phy power on failed, ret = %d\n",
 			__func__, ret);
+		goto out_disable_phy;
+	}
 
 	ufs_qcom_select_unipro_mode(host);
 
+	return 0;
+
+out_disable_phy:
+	ufs_qcom_assert_reset(hba);
+	phy_exit(phy);
 out:
 	return ret;
 }
···
 	ufs_qcom_phy_save_controller_version(host->generic_phy,
 		host->hw_ver.major, host->hw_ver.minor, host->hw_ver.step);
 
-	phy_init(host->generic_phy);
-	err = phy_power_on(host->generic_phy);
-	if (err)
-		goto out_unregister_bus;
-
 	err = ufs_qcom_init_lane_clks(host);
 	if (err)
-		goto out_disable_phy;
+		goto out_variant_clear;
 
 	ufs_qcom_set_caps(hba);
 	ufs_qcom_advertise_quirks(hba);
···
 
 	goto out;
 
-out_disable_phy:
-	phy_power_off(host->generic_phy);
-out_unregister_bus:
-	phy_exit(host->generic_phy);
 out_variant_clear:
 	ufshcd_set_variant(hba, NULL);
 out:

include/linux/phy/phy-qcom-ufs.h

···
  */
 void ufs_qcom_phy_disable_dev_ref_clk(struct phy *phy);
 
-int ufs_qcom_phy_start_serdes(struct phy *phy);
 int ufs_qcom_phy_set_tx_lane_enable(struct phy *phy, u32 tx_lanes);
-int ufs_qcom_phy_calibrate_phy(struct phy *phy, bool is_rate_B);
-int ufs_qcom_phy_is_pcs_ready(struct phy *phy);
 void ufs_qcom_phy_save_controller_version(struct phy *phy,
 			u8 major, u16 minor, u16 step);