regulator: labibb: fix standalone mode configuration

Currently, standalone mode is treated as a mode along with other
modes, LCD and AMOLED. Rather than keeping it like that, LCD and
AMOLED mode configurations should be allowed along with the way
LAB and IBB modules are controlled, i.e. standalone or dual.

Remove the standalone mode from the list of modes and keep it as
a configurable parameter via device tree. This way, LCD and
AMOLED modes can be configured along with the way LAB/IBB needs
to be controlled (dual or standalone).

Add support for parent supply to LABIBB device so that LAB and
IBB regulators can vote for MBG when operating in standalone
mode.

CRs-Fixed: 996961
Change-Id: I56882e3a5a01b017e1ba9cd63ab36933a3d469e7
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>

Documentation/devicetree/bindings/regulator/qpnp-labibb-regulator.txt

@@ -10,14 +10,11 @@ Main node required properties:
 - compatible:			Must be "qcom,qpnp-labibb-regulator"
 - qpnp,qpnp-labibb-mode:	A string used to specify the working mode of LAB/IBB
 				regulators when bootloader does not turned on the
-				display panel. Could be "lcd", "amoled" or
-				"stand-alone".
+				display panel. Could be "lcd" or "amoled".
 				"lcd" means using LAB and IBB regulators are
-				configured for LCD mode together.
+				configured for LCD mode.
 				"amoled" means using LAB and IBB regulators are
-				configured for AMOLED mode together.
-				"stand-alone" means using LAB and IBB regulators
-				as stand alone regulators.
+				configured for AMOLED mode.
 - qcom,pmic-revid:		Specifies the phandle of the PMIC revid module.
 				Used to identify the PMIC subtype.
 
@@ -41,6 +38,14 @@ Main node optional properties:
 					SWIRE command. If not specified this value
 					defaults to 20ms. This delay is applied only
 					if 'qpnp,skip-2nd-swire-cmd' is defined.
+- qcom,labibb-standalone:		A boolean property which forces LAB and
+					IBB to operate in standalone mode. If
+					this is not specified, then LAB and IBB
+					are controlled together in dual mode.
+- parent-supply:			Parent supply that is needed for LAB
+					and IBB regulators. This will be mostly
+					needed when LAB and IBB are operating
+					in standalone mode to vote for MBG.
 
 LAB subnode required properties:
 

drivers/regulator/qpnp-labibb-regulator.c

@@ -260,8 +260,6 @@ enum pmic_subtype {
 
 /**
  * enum qpnp_labibb_mode - working mode of LAB/IBB regulators
- * %QPNP_LABIBB_STANDALONE_MODE:	configure LAB/IBB regulator as a
- * standalone regulator
  * %QPNP_LABIBB_LCD_MODE:		configure LAB and IBB regulators
  * together to provide power supply for LCD
  * %QPNP_LABIBB_AMOLED_MODE:		configure LAB and IBB regulators
@@ -270,7 +268,6 @@ enum pmic_subtype {
  * supported by qpnp_labibb_regulator
  */
 enum qpnp_labibb_mode {
-	QPNP_LABIBB_STANDALONE_MODE = 1,
 	QPNP_LABIBB_LCD_MODE,
 	QPNP_LABIBB_AMOLED_MODE,
 	QPNP_LABIBB_MAX_MODE,
@@ -481,7 +478,8 @@ struct qpnp_labibb {
 	u16				ibb_base;
 	struct lab_regulator		lab_vreg;
 	struct ibb_regulator		ibb_vreg;
-	int				mode;
+	enum qpnp_labibb_mode		mode;
+	bool				standalone;
 	bool				ttw_en;
 	bool				in_ttw_mode;
 	bool				ibb_settings_saved;
@@ -686,7 +684,6 @@ static int qpnp_lab_dt_init(struct qpnp_labibb *labibb,
 	u8 i, val;
 	u32 tmp;
 
-	if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE) {
 	if (labibb->mode == QPNP_LABIBB_LCD_MODE)
 		val = REG_LAB_IBB_LCD_MODE;
 	else
@@ -701,17 +698,6 @@ static int qpnp_lab_dt_init(struct qpnp_labibb *labibb,
 		return rc;
 	}
 
-		val = LAB_IBB_EN_RDY_EN;
-		rc = qpnp_labibb_sec_write(labibb, labibb->lab_base,
-				REG_LAB_IBB_EN_RDY, &val, 1);
-
-		if (rc) {
-			pr_err("qpnp_lab_sec_write register %x failed rc = %d\n",
-				REG_LAB_IBB_EN_RDY, rc);
-			return rc;
-		}
-	}
-
 	val = 0;
 
 	if (of_property_read_bool(of_node, "qcom,qpnp-lab-full-pull-down"))
@@ -1454,7 +1440,7 @@ static int qpnp_lab_regulator_enable(struct regulator_dev *rdev)
 
 	if (!labibb->lab_vreg.vreg_enabled && !labibb->swire_control) {
 
-		if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE)
+		if (!labibb->standalone)
 			return qpnp_labibb_regulator_enable(labibb);
 
 		val = LAB_ENABLE_CTL_EN;
@@ -1495,7 +1481,7 @@ static int qpnp_lab_regulator_disable(struct regulator_dev *rdev)
 
 	if (labibb->lab_vreg.vreg_enabled && !labibb->swire_control) {
 
-		if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE)
+		if (!labibb->standalone)
 			return qpnp_labibb_regulator_disable(labibb);
 
 		val = 0;
@@ -1809,6 +1795,16 @@ static int register_qpnp_lab_regulator(struct qpnp_labibb *labibb,
 		}
 	}
 
+	val = (labibb->standalone) ? 0 : LAB_IBB_EN_RDY_EN;
+	rc = qpnp_labibb_sec_write(labibb, labibb->lab_base,
+			REG_LAB_IBB_EN_RDY, &val, 1);
+
+	if (rc) {
+		pr_err("qpnp_lab_sec_write register %x failed rc = %d\n",
+			REG_LAB_IBB_EN_RDY, rc);
+		return rc;
+	}
+
 	rc = qpnp_labibb_read(labibb, &val,
 				labibb->ibb_base + REG_IBB_ENABLE_CTL, 1);
 	if (rc) {
@@ -1884,8 +1880,7 @@ static int register_qpnp_lab_regulator(struct qpnp_labibb *labibb,
 		return rc;
 	}
 
-	if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE &&
-			!(val & LAB_MODULE_RDY_EN)) {
+	if (!(val & LAB_MODULE_RDY_EN)) {
 		val = LAB_MODULE_RDY_EN;
 
 		rc = qpnp_labibb_write(labibb, labibb->lab_base +
@@ -1909,6 +1904,10 @@ static int register_qpnp_lab_regulator(struct qpnp_labibb *labibb,
 		cfg.driver_data = labibb;
 		cfg.of_node = of_node;
 
+		if (of_get_property(labibb->dev->of_node, "parent-supply",
+				NULL))
+			init_data->supply_regulator = "parent";
+
 		init_data->constraints.valid_ops_mask
 				|= REGULATOR_CHANGE_VOLTAGE |
 					REGULATOR_CHANGE_STATUS;
@@ -1938,7 +1937,6 @@ static int qpnp_ibb_dt_init(struct qpnp_labibb *labibb,
 	u32 i, tmp;
 	u8 val;
 
-	if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE) {
 	if (labibb->mode == QPNP_LABIBB_LCD_MODE)
 		val = REG_LAB_IBB_LCD_MODE;
 	else
@@ -1952,7 +1950,6 @@ static int qpnp_ibb_dt_init(struct qpnp_labibb *labibb,
 			REG_IBB_LCD_AMOLED_SEL, rc);
 		return rc;
 	}
-	}
 
 	rc = of_property_read_u32(of_node, "qcom,qpnp-ibb-lab-pwrdn-delay",
 					&tmp);
@@ -1999,7 +1996,6 @@ static int qpnp_ibb_dt_init(struct qpnp_labibb *labibb,
 	if (of_property_read_bool(of_node, "qcom,qpnp-ibb-en-discharge"))
 		val |= PWRUP_PWRDN_CTL_1_DISCHARGE_EN;
 
-	if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE)
 	val |= (IBB_PWRUP_PWRDN_CTL_1_EN_DLY1 |
 			IBB_PWRUP_PWRDN_CTL_1_LAB_VREG_OK);
 
@@ -2219,14 +2215,13 @@ static int qpnp_ibb_dt_init(struct qpnp_labibb *labibb,
 
 static int qpnp_ibb_regulator_enable(struct regulator_dev *rdev)
 {
-	int rc;
+	int rc, delay, retries = 10;
 	u8 val;
-
 	struct qpnp_labibb *labibb  = rdev_get_drvdata(rdev);
 
 	if (!labibb->ibb_vreg.vreg_enabled && !labibb->swire_control) {
 
-		if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE)
+		if (!labibb->standalone)
 			return qpnp_labibb_regulator_enable(labibb);
 
 		rc = qpnp_ibb_set_mode(labibb, IBB_SW_CONTROL_EN);
@@ -2235,7 +2230,10 @@ static int qpnp_ibb_regulator_enable(struct regulator_dev *rdev)
 			return rc;
 		}
 
-		udelay(labibb->ibb_vreg.soft_start);
+		delay = labibb->ibb_vreg.soft_start;
+		while (retries--) {
+			/* Wait for a small period before reading IBB_STATUS1 */
+			usleep_range(delay, delay + 100);
 
 			rc = qpnp_labibb_read(labibb, &val,
 					labibb->ibb_base + REG_IBB_STATUS1, 1);
@@ -2245,7 +2243,11 @@ static int qpnp_ibb_regulator_enable(struct regulator_dev *rdev)
 				return rc;
 			}
 
-		if ((val & IBB_STATUS1_VREG_OK_MASK) != IBB_STATUS1_VREG_OK) {
+			if (val & IBB_STATUS1_VREG_OK)
+				break;
+		}
+
+		if (!(val & IBB_STATUS1_VREG_OK)) {
 			pr_err("qpnp_ibb_regulator_enable failed\n");
 			return -EINVAL;
 		}
@@ -2262,7 +2264,7 @@ static int qpnp_ibb_regulator_disable(struct regulator_dev *rdev)
 
 	if (labibb->ibb_vreg.vreg_enabled && !labibb->swire_control) {
 
-		if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE)
+		if (!labibb->standalone)
 			return qpnp_labibb_regulator_disable(labibb);
 
 		rc = qpnp_ibb_set_mode(labibb, IBB_SW_CONTROL_DIS);
@@ -2590,6 +2592,19 @@ static int register_qpnp_ibb_regulator(struct qpnp_labibb *labibb,
 		}
 	}
 
+	if (labibb->standalone) {
+		val = 0;
+		rc = qpnp_labibb_sec_write(labibb, labibb->ibb_base,
+				REG_IBB_PWRUP_PWRDN_CTL_1, &val, 1);
+		if (rc) {
+			pr_err("qpnp_labibb_sec_write register %x failed rc = %d\n",
+				REG_IBB_PWRUP_PWRDN_CTL_1, rc);
+			return rc;
+		}
+		labibb->ibb_vreg.pwrup_dly = 0;
+		labibb->ibb_vreg.pwrdn_dly = 0;
+	}
+
 	rc = qpnp_labibb_read(labibb, &val,
 			labibb->ibb_base + REG_IBB_MODULE_RDY, 1);
 	if (rc) {
@@ -2598,8 +2613,7 @@ static int register_qpnp_ibb_regulator(struct qpnp_labibb *labibb,
 		return rc;
 	}
 
-	if (labibb->mode != QPNP_LABIBB_STANDALONE_MODE &&
-			!(val & IBB_MODULE_RDY_EN)) {
+	if (!(val & IBB_MODULE_RDY_EN)) {
 		val = IBB_MODULE_RDY_EN;
 
 		rc = qpnp_labibb_write(labibb, labibb->ibb_base +
@@ -2623,6 +2637,10 @@ static int register_qpnp_ibb_regulator(struct qpnp_labibb *labibb,
 		cfg.driver_data = labibb;
 		cfg.of_node = of_node;
 
+		if (of_get_property(labibb->dev->of_node, "parent-supply",
+				 NULL))
+			init_data->supply_regulator = "parent";
+
 		init_data->constraints.valid_ops_mask
 				|= REGULATOR_CHANGE_VOLTAGE |
 					REGULATOR_CHANGE_STATUS;
@@ -2741,8 +2759,6 @@ static int qpnp_labibb_regulator_probe(struct platform_device *pdev)
 			labibb->mode = QPNP_LABIBB_LCD_MODE;
 		} else if (strcmp("amoled", mode_name) == 0) {
 			labibb->mode = QPNP_LABIBB_AMOLED_MODE;
-		} else if (strcmp("stand-alone", mode_name) == 0) {
-			labibb->mode = QPNP_LABIBB_STANDALONE_MODE;
 		} else {
 			pr_err("Invalid device property in qpnp,qpnp-labibb-mode: %s\n",
 				mode_name);
@@ -2753,6 +2769,9 @@ static int qpnp_labibb_regulator_probe(struct platform_device *pdev)
 		return rc;
 	}
 
+	labibb->standalone = of_property_read_bool(labibb->dev->of_node,
+				"qcom,labibb-standalone");
+
 	labibb->ttw_en = of_property_read_bool(labibb->dev->of_node,
 				"qcom,labibb-touch-to-wake-en");
 	if (labibb->ttw_en && labibb->mode != QPNP_LABIBB_LCD_MODE) {