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Commit 1bcb64f5 authored by Tirupathi Reddy's avatar Tirupathi Reddy Committed by Kiran Gunda
Browse files

regulator: cpr4: add support for aging voltage margin adjustment 



Add support for increasing the closed-loop voltage margin over
time based upon the results of aging sensor measurements.  The
aging ring oscillators (ROs) are arranging in pairs such that
one is constantly stressed by the vdd-supply voltage and the
other is never stressed.  The difference between the quotients
measured by these ROs gives an indication of how much the silicon
has aged.

CRs-Fixed: 1025832
Change-Id: I2948c227153569d3c785ea3ac6d75453525db7e1
Signed-off-by: default avatarTirupathi Reddy <tirupath@codeaurora.org>
parent e3950ebc

Documentation/devicetree/bindings/regulator/cpr4-apss-regulator.txt

+10 −0
Original line number Original line Diff line number Diff line
@@ -414,6 +414,8 @@ apc_cpr: cpr4-ctrl@b018000 { 
			"APCS_ALIAS0_APM_CTLER_STATUS",

			"APCS_ALIAS0_APM_CTLER_STATUS",

			"APCS0_CPR_CORE_ADJ_MODE_REG";

			"APCS0_CPR_CORE_ADJ_MODE_REG";





	qcom,cpr-aging-ref-voltage = <990000>; /* Turbo corner */



	thread@0 {

	thread@0 {

		qcom,cpr-thread-id = <0>;

		qcom,cpr-thread-id = <0>;

		qcom,cpr-consecutive-up = <1>;

		qcom,cpr-consecutive-up = <1>;
@@ -517,6 +519,14 @@ apc_cpr: cpr4-ctrl@b018000 { 
				<(-20000) (-15000) (-10000) 0>;

				<(-20000) (-15000) (-10000) 0>;

			qcom,allow-boost =

			qcom,allow-boost =

				<1>;

				<1>;



			qcom,cpr-aging-max-voltage-adjustment = <15000>;

			qcom,cpr-aging-ref-corner = <6>; /* Turbo corner */

			qcom,cpr-aging-ro-scaling-factor = <2800>;

			qcom,cpr-aging-derate =

				<1000 1000 1000 1000 1000

				 1000 1000 1000>;

			qcom,allow-aging-voltage-adjustment = <1>;

		};

		};

	};

	};

};
 
};

drivers/regulator/cpr4-apss-regulator.c

+107 −0
Original line number Original line Diff line number Diff line
@@ -54,6 +54,8 @@ 
 * @boost_cfg:		CPR boost configuration fuse parameter value

 * @boost_cfg:		CPR boost configuration fuse parameter value

 * @boost_voltage:	CPR boost voltage fuse parameter value (raw, not

 * @boost_voltage:	CPR boost voltage fuse parameter value (raw, not

 *			converted to a voltage)

 *			converted to a voltage)

 * @aging_init_quot_diff:	Initial quotient difference between CPR aging

 *			min and max sensors measured at time of manufacturing

 *

 *

 * This struct holds the values for all of the fuses read from memory.

 * This struct holds the values for all of the fuses read from memory.

 */

 */
@@ -67,6 +69,7 @@ struct cpr4_msm8953_apss_fuses { 
	u64	boost_cfg;

	u64	boost_cfg;

	u64	boost_voltage;

	u64	boost_voltage;

	u64	misc;

	u64	misc;

	u64	aging_init_quot_diff;

};

};





/*

/*
@@ -161,6 +164,12 @@ static const struct cpr3_fuse_param msm8953_misc_fuse_volt_adj_param[] = { 
	{},

	{},

};

};





static const struct cpr3_fuse_param msm8953_apss_aging_init_quot_diff_param[]

= {

	{72, 0, 7},

	{},

};



/*

/*

 * The number of possible values for misc fuse is

 * The number of possible values for misc fuse is

 * 2^(#bits defined for misc fuse)

 * 2^(#bits defined for misc fuse)
@@ -206,6 +215,14 @@ static const int msm8953_apss_fuse_ref_volt 
 */

 */

static bool boost_fuse[MAX_BOOST_CONFIG_FUSE_VALUE] = {0, 1, 1, 1, 1, 1, 1, 1};

static bool boost_fuse[MAX_BOOST_CONFIG_FUSE_VALUE] = {0, 1, 1, 1, 1, 1, 1, 1};





/* CPR Aging parameters for msm8953 */

#define MSM8953_APSS_AGING_INIT_QUOT_DIFF_SCALE	1

#define MSM8953_APSS_AGING_INIT_QUOT_DIFF_SIZE	8

#define MSM8953_APSS_AGING_SENSOR_ID		6



/* Use a very high value for max aging margin to be applied */

#define MSM8953_APSS_AGING_MAX_AGE_MARGIN_QUOT	(-1000)



/**

/**

 * cpr4_msm8953_apss_read_fuse_data() - load APSS specific fuse parameter values

 * cpr4_msm8953_apss_read_fuse_data() - load APSS specific fuse parameter values

 * @vreg:		Pointer to the CPR3 regulator

 * @vreg:		Pointer to the CPR3 regulator
@@ -257,6 +274,14 @@ static int cpr4_msm8953_apss_read_fuse_data(struct cpr3_regulator *vreg) 
		return -EINVAL;

		return -EINVAL;

	}

	}





	rc = cpr3_read_fuse_param(base, msm8953_apss_aging_init_quot_diff_param,

				&fuse->aging_init_quot_diff);

	if (rc) {

		cpr3_err(vreg, "Unable to read aging initial quotient difference fuse, rc=%d\n",

			rc);

		return rc;

	}



	for (i = 0; i < MSM8953_APSS_FUSE_CORNERS; i++) {

	for (i = 0; i < MSM8953_APSS_FUSE_CORNERS; i++) {

		rc = cpr3_read_fuse_param(base,

		rc = cpr3_read_fuse_param(base,

				msm8953_apss_init_voltage_param[i],

				msm8953_apss_init_voltage_param[i],
@@ -1211,6 +1236,81 @@ static int cpr4_apss_init_regulator(struct cpr3_regulator *vreg) 
	return rc;

	return rc;

}

}





/**

 * cpr4_apss_init_aging() - perform APSS CPR4 controller specific

 *		aging initializations

 * @ctrl:		Pointer to the CPR3 controller

 *

 * Return: 0 on success, errno on failure

 */

static int cpr4_apss_init_aging(struct cpr3_controller *ctrl)

{

	struct cpr4_msm8953_apss_fuses *fuse = NULL;

	struct cpr3_regulator *vreg;

	u32 aging_ro_scale;

	int i, j, rc;



	for (i = 0; i < ctrl->thread_count; i++) {

		for (j = 0; j < ctrl->thread[i].vreg_count; j++) {

			if (ctrl->thread[i].vreg[j].aging_allowed) {

				ctrl->aging_required = true;

				vreg = &ctrl->thread[i].vreg[j];

				fuse = vreg->platform_fuses;

				break;

			}

		}

	}



	if (!ctrl->aging_required || !fuse)

		return 0;



	rc = cpr3_parse_array_property(vreg, "qcom,cpr-aging-ro-scaling-factor",

					1, &aging_ro_scale);

	if (rc)

		return rc;



	if (aging_ro_scale == 0) {

		cpr3_err(ctrl, "aging RO scaling factor is invalid: %u\n",

			aging_ro_scale);

		return -EINVAL;

	}



	ctrl->aging_vdd_mode = REGULATOR_MODE_NORMAL;

	ctrl->aging_complete_vdd_mode = REGULATOR_MODE_IDLE;



	ctrl->aging_sensor_count = 1;

	ctrl->aging_sensor = kzalloc(sizeof(*ctrl->aging_sensor), GFP_KERNEL);

	if (!ctrl->aging_sensor)

		return -ENOMEM;



	ctrl->aging_sensor->sensor_id = MSM8953_APSS_AGING_SENSOR_ID;

	ctrl->aging_sensor->ro_scale = aging_ro_scale;



	ctrl->aging_sensor->init_quot_diff

		= cpr3_convert_open_loop_voltage_fuse(0,

			MSM8953_APSS_AGING_INIT_QUOT_DIFF_SCALE,

			fuse->aging_init_quot_diff,

			MSM8953_APSS_AGING_INIT_QUOT_DIFF_SIZE);



	if (ctrl->aging_sensor->init_quot_diff == 0) {

		/*

		 * Initial quotient difference value '0' has a special meaning

		 * in MSM8953 fusing scheme. Use max age margin quotient

		 * difference to consider full aging margin of 15 mV.

		 */

		ctrl->aging_sensor->init_quot_diff

			= MSM8953_APSS_AGING_MAX_AGE_MARGIN_QUOT;

		cpr3_debug(ctrl, "Init quotient diff = 0, use max age margin quotient\n");

	}



	cpr3_info(ctrl, "sensor %u aging init quotient diff = %d, aging RO scale = %u QUOT/V\n",

		ctrl->aging_sensor->sensor_id,

		ctrl->aging_sensor->init_quot_diff,

		ctrl->aging_sensor->ro_scale);



	return 0;

}



/**

/**

 * cpr4_apss_init_controller() - perform APSS CPR4 controller specific

 * cpr4_apss_init_controller() - perform APSS CPR4 controller specific

 *		initializations

 *		initializations
@@ -1390,6 +1490,13 @@ static int cpr4_apss_regulator_probe(struct platform_device *pdev) 
		}

		}

	}

	}





	rc = cpr4_apss_init_aging(ctrl);

	if (rc) {

		cpr3_err(ctrl, "failed to initialize aging configurations, rc=%d\n",

			rc);

		return rc;

	}



	platform_set_drvdata(pdev, ctrl);

	platform_set_drvdata(pdev, ctrl);





	return cpr3_regulator_register(pdev, ctrl);

	return cpr3_regulator_register(pdev, ctrl);