Merge "regulator: cpr3-hmss-regulator: add support for the partial binning fuse" (aaedd696) · Commits · e / devices / android_kernel_xiaomi_markw

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;