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Commit a2197360 authored by David Collins's avatar David Collins
Browse files

regulator: cpr3-hmss-regulator: add support for the partial binning fuse 



Some parts are not able to operate at voltages below SVS Fmax or
NOM Fmax.  Add support to limit the voltages allowed for lower
corners based upon the value of the partial binning fuse.

Change-Id: If216d780af411c86afc0fb6d4432ab42e9d894f7
Signed-off-by: default avatarDavid Collins <collinsd@codeaurora.org>
parent 77813844

drivers/regulator/cpr3-hmss-regulator.c

+83 −0
Original line number Diff line number Diff line
@@ -54,6 +54,8 @@ 
 * @cpr_fusing_rev:	CPR fusing revision fuse parameter value

 * @redundant_fusing:	Redundant fusing select fuse parameter value

 * @limitation:		CPR limitation select fuse parameter value

 * @partial_binning:	Chip partial binning fuse parameter value which defines

 *			limitations found on a given chip

 *

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

 * values for ro_sel, init_voltage, target_quot, and quot_offset come from
@@ -69,6 +71,7 @@ struct cpr3_msm8996_hmss_fuses { 
	u64	cpr_fusing_rev;

	u64	redundant_fusing;

	u64	limitation;

	u64	partial_binning;

};



/**
@@ -315,6 +318,11 @@ static const struct cpr3_fuse_param msm8996_cpr_limitation_param[] = { 
	{},

};



static const struct cpr3_fuse_param msm8996_cpr_partial_binning_param[] = {

	{39, 55, 59},

	{},

};



/*

 * Some initial msm8996 parts cannot be used in a meaningful way by software.

 * Other parts can only be used when operating with CPR disabled (i.e. at the
@@ -327,6 +335,15 @@ enum msm8996_cpr_limitation { 
	MSM8996_CPR_LIMITATION_NO_CPR_OR_INTERPOLATION = 3,

};



/*

 * Some initial msm8996 parts cannot be operated at low voltages.  A fuse

 * parameter is provided so that software can properly handle these limitations.

 */

enum msm8996_cpr_partial_binning {

	MSM8996_CPR_PARTIAL_BINNING_SVS = 11,

	MSM8996_CPR_PARTIAL_BINNING_NOM = 12,

};



/* Additional MSM8996 specific data: */



/* Open loop voltage fuse reference voltages in microvolts for MSM8996 v1/v2 */
@@ -422,6 +439,20 @@ static int cpr3_msm8996_hmss_read_fuse_data(struct cpr3_regulator *vreg) 
			  == MSM8996_CPR_LIMITATION_NO_CPR_OR_INTERPOLATION

		? "CPR disabled and no interpolation" : "none");



	rc = cpr3_read_fuse_param(base, msm8996_cpr_partial_binning_param,

				&fuse->partial_binning);

	if (rc) {

		cpr3_err(vreg, "Unable to read partial binning fuse, rc=%d\n",

			rc);

		return rc;

	}

	cpr3_info(vreg, "CPR partial binning limitation = %s\n",

		fuse->partial_binning == MSM8996_CPR_PARTIAL_BINNING_SVS

			? "SVS min voltage"

		: fuse->partial_binning == MSM8996_CPR_PARTIAL_BINNING_NOM

			? "NOM min voltage"

		: "none");



	id = vreg->thread->thread_id;



	for (i = 0; i < MSM8996_HMSS_FUSE_CORNERS; i++) {
@@ -1105,6 +1136,51 @@ done: 
	return rc;

}



/**

 * cpr3_msm8996_partial_binning_override() - override the voltage and quotient

 *		settings for low corners based upon the value of the partial

 *		binning fuse

 * @vreg:		Pointer to the CPR3 regulator

 *

 * Some parts are not able to operate at low voltages.  The partial binning

 * fuse specifies if a given part has such limitations.

 *

 * Return: 0 on success, errno on failure

 */

static int cpr3_msm8996_partial_binning_override(struct cpr3_regulator *vreg)

{

	struct cpr3_msm8996_hmss_fuses *fuse = vreg->platform_fuses;

	int i, fuse_corner, fmax_corner;



	if (fuse->partial_binning == MSM8996_CPR_PARTIAL_BINNING_SVS)

		fuse_corner = CPR3_MSM8996_HMSS_FUSE_CORNER_SVS;

	else if (fuse->partial_binning == MSM8996_CPR_PARTIAL_BINNING_NOM)

		fuse_corner = CPR3_MSM8996_HMSS_FUSE_CORNER_NOM;

	else

		return 0;



	cpr3_info(vreg, "overriding voltages and quotients for all corners below %s Fmax\n",

		cpr3_msm8996_hmss_fuse_corner_name[fuse_corner]);



	fmax_corner = -1;

	for (i = vreg->corner_count - 1; i >= 0; i--) {

		if (vreg->corner[i].cpr_fuse_corner == fuse_corner) {

			fmax_corner = i;

			break;

		}

	}

	if (fmax_corner < 0) {

		cpr3_err(vreg, "could not find %s Fmax corner\n",

			cpr3_msm8996_hmss_fuse_corner_name[fuse_corner]);

		return -EINVAL;

	}



	for (i = 0; i < fmax_corner; i++)

		vreg->corner[i] = vreg->corner[fmax_corner];



	return 0;

}



/**

 * cpr3_hmss_print_settings() - print out HMSS CPR configuration settings into

 *		the kernel log for debugging purposes
@@ -1233,6 +1309,13 @@ static int cpr3_hmss_init_regulator(struct cpr3_regulator *vreg) 
		return rc;

	}



	rc = cpr3_msm8996_partial_binning_override(vreg);

	if (rc) {

		cpr3_err(vreg, "unable to override voltages and quotients based on partial binning fuse, rc=%d\n",

			rc);

		return rc;

	}



	cpr3_hmss_print_settings(vreg);



	return 0;