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Commit 9bc8edeb authored by Ashay Jaiswal's avatar Ashay Jaiswal Committed by Umang Agrawal
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power: smb1355: add support for die-temp based mitigation 



Add support to configure/enable hardware controlled mitigation
based on DIE temperature. H/W controlled scheme manipulates
charge current(FCC) going though the charger whenever
die temperature crosses configured threshold.

Change-Id: Icc7ed6d0f5464ba6223745db440087d9aa4909eb
Signed-off-by: default avatarAshay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: default avatarUmang Agrawal <uagrawal@codeaurora.org>
parent d836ead7

Documentation/devicetree/bindings/power/supply/qcom/smb1355-charger.txt

+12 −0
Original line number Diff line number Diff line
@@ -51,6 +51,18 @@ Charger specific properties: 
	      stacked one after the other and thus all the charge current

	      (FCC) flows through main. In a non-stacked configuration each

	      charger controls the charge current (FCC) separately.



- qcom,die-temp-threshold-degc

  Usage:      optional

  Value type: <u32>

  Definition: Specifies DIE temp threshold beyond which h/w starts mitigation.

	      If not sepcified, 90 degrees centigrade is used.



- qcom,hw-die-temp-mitigation

  Usage:      optional

  Value type: bool

  Definition: Boolean property to enable h/w controlled die temp mitigation.



================================================

Second Level Nodes - SMB1355 Charger Peripherals

================================================

drivers/power/supply/qcom/smb1355-charger.c

+91 −29
Original line number Diff line number Diff line
@@ -85,8 +85,12 @@ 
#define BATIF_CFG_SMISC_BATID_REG		(BATIF_BASE + 0x73)

#define CFG_SMISC_RBIAS_EXT_CTRL_BIT		BIT(2)



#define SMB2CHGS_BATIF_ENG_SMISC_DIETEMP	(BATIF_BASE + 0xC0)

#define SMB2CHG_BATIF_ENG_SMISC_DIETEMP	(BATIF_BASE + 0xC0)

#define TDIE_COMPARATOR_THRESHOLD		GENMASK(5, 0)

#define DIE_LOW_RANGE_BASE_DEGC			34

#define DIE_LOW_RANGE_DELTA			16

#define DIE_LOW_RANGE_MAX_DEGC			97

#define DIE_LOW_RANGE_SHIFT			4



#define BATIF_ENG_SCMISC_SPARE1_REG		(BATIF_BASE + 0xC2)

#define EXT_BIAS_PIN_BIT			BIT(2)
@@ -96,13 +100,10 @@ 
#define VALLEY_COMPARATOR_EN_BIT		BIT(0)



#define TEMP_COMP_STATUS_REG			(MISC_BASE + 0x07)

#define SKIN_TEMP_RST_HOT_BIT			BIT(6)

#define SKIN_TEMP_UB_HOT_BIT			BIT(5)

#define SKIN_TEMP_LB_HOT_BIT			BIT(4)

#define DIE_TEMP_TSD_HOT_BIT			BIT(3)

#define DIE_TEMP_RST_HOT_BIT			BIT(2)

#define DIE_TEMP_UB_HOT_BIT			BIT(1)

#define DIE_TEMP_LB_HOT_BIT			BIT(0)

#define TEMP_RST_HOT_BIT			BIT(2)

#define TEMP_UB_HOT_BIT				BIT(1)

#define TEMP_LB_HOT_BIT				BIT(0)

#define SKIN_TEMP_SHIFT				4



#define MISC_RT_STS_REG				(MISC_BASE + 0x10)

#define HARD_ILIMIT_RT_STS_BIT			BIT(5)
@@ -224,6 +225,8 @@ struct smb_dt_props { 
	bool	disable_ctm;

	int	pl_mode;

	int	pl_batfet_mode;

	bool	hw_die_temp_mitigation;

	u32	die_temp_threshold;

};



struct smb1355 {
@@ -251,6 +254,11 @@ struct smb1355 { 
	struct votable		*irq_disable_votable;

};



enum {

	CONNECTOR_TEMP = 0,

	DIE_TEMP,

};



static bool is_secure(struct smb1355 *chip, int addr)

{

	if (addr == CLOCK_REQUEST_REG)
@@ -380,8 +388,7 @@ static void die_temp_work(struct work_struct *work) 
	u8 temp_stat;



	for (i = 0; i < BIT(5); i++) {

		rc = smb1355_masked_write(chip,

				SMB2CHGS_BATIF_ENG_SMISC_DIETEMP,

		rc = smb1355_masked_write(chip, SMB2CHG_BATIF_ENG_SMISC_DIETEMP,

				TDIE_COMPARATOR_THRESHOLD, i);

		if (rc < 0) {

			pr_err("Couldn't set temp comp threshold rc=%d\n", rc);
@@ -400,7 +407,7 @@ static void die_temp_work(struct work_struct *work) 
			continue;

		}



		if (!(temp_stat & DIE_TEMP_UB_HOT_BIT)) {

		if (!(temp_stat & TEMP_UB_HOT_BIT)) {

			/* found the temp */

			break;

		}
@@ -466,6 +473,7 @@ static int smb1355_determine_initial_status(struct smb1355 *chip) 
	return 0;

}



#define DEFAULT_DIE_TEMP_LOW_THRESHOLD		90

static int smb1355_parse_dt(struct smb1355 *chip)

{

	struct device_node *node = chip->dev->of_node;
@@ -496,6 +504,15 @@ static int smb1355_parse_dt(struct smb1355 *chip) 
	if (of_property_read_bool(node, "qcom,stacked-batfet"))

		chip->dt.pl_batfet_mode = POWER_SUPPLY_PL_STACKED_BATFET;



	chip->dt.hw_die_temp_mitigation = of_property_read_bool(node,

					"qcom,hw-die-temp-mitigation");



	chip->dt.die_temp_threshold = DEFAULT_DIE_TEMP_LOW_THRESHOLD;

	of_property_read_u32(node, "qcom,die-temp-threshold-degc",

				&chip->dt.die_temp_threshold);

	if (chip->dt.die_temp_threshold > DIE_LOW_RANGE_MAX_DEGC)

		chip->dt.die_temp_threshold = DIE_LOW_RANGE_MAX_DEGC;



	return 0;

}
@@ -521,6 +538,7 @@ static enum power_supply_property smb1355_parallel_props[] = { 
	POWER_SUPPLY_PROP_MIN_ICL,

	POWER_SUPPLY_PROP_CURRENT_MAX,

	POWER_SUPPLY_PROP_SET_SHIP_MODE,

	POWER_SUPPLY_PROP_DIE_HEALTH,

};



static int smb1355_get_prop_batt_charge_type(struct smb1355 *chip,
@@ -547,10 +565,13 @@ static int smb1355_get_prop_batt_charge_type(struct smb1355 *chip, 
	return rc;

}



static int smb1355_get_prop_connector_health(struct smb1355 *chip)

static int smb1355_get_prop_health(struct smb1355 *chip, int type)

{

	u8 temp;

	int rc;

	int rc, shift;



	/* Connector-temp uses skin-temp configuration */

	shift = (type == CONNECTOR_TEMP) ? SKIN_TEMP_SHIFT : 0;



	rc = smb1355_read(chip, TEMP_COMP_STATUS_REG, &temp);

	if (rc < 0) {
@@ -558,13 +579,13 @@ static int smb1355_get_prop_connector_health(struct smb1355 *chip) 
		return POWER_SUPPLY_HEALTH_UNKNOWN;

	}



	if (temp & SKIN_TEMP_RST_HOT_BIT)

	if (temp & (TEMP_RST_HOT_BIT << shift))

		return POWER_SUPPLY_HEALTH_OVERHEAT;



	if (temp & SKIN_TEMP_UB_HOT_BIT)

	if (temp & (TEMP_UB_HOT_BIT << shift))

		return POWER_SUPPLY_HEALTH_HOT;



	if (temp & SKIN_TEMP_LB_HOT_BIT)

	if (temp & (TEMP_LB_HOT_BIT << shift))

		return POWER_SUPPLY_HEALTH_WARM;



	return POWER_SUPPLY_HEALTH_COOL;
@@ -597,6 +618,16 @@ static int smb1355_parallel_get_prop(struct power_supply *psy, 
		val->intval = chip->die_temp_deciDegC;

		break;

	case POWER_SUPPLY_PROP_CHARGER_TEMP_MAX:

		/*

		 * In case of h/w controlled die_temp mitigation,

		 * die_temp/die_temp_max can not be reported as this

		 * requires run time manipulation of DIE_TEMP low

		 * threshold which will interfere with h/w mitigation

		 * scheme.

		 */

		if (chip->dt.hw_die_temp_mitigation)

			val->intval = -EINVAL;

		else

			val->intval = chip->c_charger_temp_max;

		break;

	case POWER_SUPPLY_PROP_INPUT_SUSPEND:
@@ -618,10 +649,14 @@ static int smb1355_parallel_get_prop(struct power_supply *psy, 
		break;

	case POWER_SUPPLY_PROP_CONNECTOR_HEALTH:

		if (chip->c_health == -EINVAL)

			val->intval = smb1355_get_prop_connector_health(chip);

			val->intval = smb1355_get_prop_health(chip,

						CONNECTOR_TEMP);

		else

			val->intval = chip->c_health;

		break;

	case POWER_SUPPLY_PROP_DIE_HEALTH:

		val->intval = smb1355_get_prop_health(chip, DIE_TEMP);

		break;

	case POWER_SUPPLY_PROP_PARALLEL_BATFET_MODE:

		val->intval = chip->dt.pl_batfet_mode;

		break;
@@ -691,6 +726,8 @@ static int smb1355_set_parallel_charging(struct smb1355 *chip, bool disable) 
	}



	chip->die_temp_deciDegC = -EINVAL;

	/* Only enable temperature measurement for s/w based mitigation */

	if (!chip->dt.hw_die_temp_mitigation) {

		if (disable) {

			chip->exit_die_temp = true;

			cancel_delayed_work_sync(&chip->die_temp_work);
@@ -699,6 +736,7 @@ static int smb1355_set_parallel_charging(struct smb1355 *chip, bool disable) 
			chip->exit_die_temp = false;

			schedule_delayed_work(&chip->die_temp_work, 0);

		}

	}



	if (chip->irq_disable_votable)

		vote(chip->irq_disable_votable, PARALLEL_ENABLE_VOTER,
@@ -964,6 +1002,7 @@ static int smb1355_tskin_sensor_config(struct smb1355 *chip) 
static int smb1355_init_hw(struct smb1355 *chip)

{

	int rc;

	u8 val, range;



	/* request clock always on */

	rc = smb1355_clk_request(chip, true);
@@ -1040,13 +1079,35 @@ static int smb1355_init_hw(struct smb1355 *chip) 
		return rc;

	}



	/* Configure DIE temp Low threshold */

	if (chip->dt.hw_die_temp_mitigation) {

		range = (chip->dt.die_temp_threshold - DIE_LOW_RANGE_BASE_DEGC)

						/ (DIE_LOW_RANGE_DELTA);

		val = (chip->dt.die_temp_threshold

				- ((range * DIE_LOW_RANGE_DELTA)

						+ DIE_LOW_RANGE_BASE_DEGC))

				% DIE_LOW_RANGE_DELTA;



		rc = smb1355_masked_write(chip, SMB2CHG_BATIF_ENG_SMISC_DIETEMP,

				TDIE_COMPARATOR_THRESHOLD,

				(range << DIE_LOW_RANGE_SHIFT) | val);

		if (rc < 0) {

			pr_err("Couldn't set temp comp threshold rc=%d\n", rc);

			return rc;

		}

	}



	/*

	 * Enable thermal Die temperature comparator source and disable hw

	 * mitigation for skin/die

	 * Enable thermal Die temperature comparator source and

	 * enable hardware controlled current adjustment for die temp

	 * if charger is configured in h/w controlled die temp mitigation.

	 */

	val = THERMREG_DIE_CMP_SRC_EN_BIT;

	if (!chip->dt.hw_die_temp_mitigation)

		val |= BYP_THERM_CHG_CURR_ADJUST_BIT;

	rc = smb1355_masked_write(chip, MISC_THERMREG_SRC_CFG_REG,

		THERMREG_DIE_CMP_SRC_EN_BIT | BYP_THERM_CHG_CURR_ADJUST_BIT,

		THERMREG_DIE_CMP_SRC_EN_BIT | BYP_THERM_CHG_CURR_ADJUST_BIT);

		val);

	if (rc < 0) {

		pr_err("Couldn't set Skin temperature comparator src rc=%d\n",

			rc);
@@ -1057,8 +1118,9 @@ static int smb1355_init_hw(struct smb1355 *chip) 
	 * Disable hysterisis for die temperature. This is so that sw can run

	 * stepping scheme quickly

	 */

	val = chip->dt.hw_die_temp_mitigation ? DIE_TEMP_COMP_HYST_BIT : 0;

	rc = smb1355_masked_write(chip, BATIF_ENG_SCMISC_SPARE1_REG,

				DIE_TEMP_COMP_HYST_BIT, 0);

				DIE_TEMP_COMP_HYST_BIT, val);

	if (rc < 0) {

		pr_err("Couldn't disable hyst. for die rc=%d\n", rc);

		return rc;