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Commit 31a41c69 authored by David Collins's avatar David Collins
Browse files

regulator: cpr-regulator: add support for CPR ceiling voltage reduction 



Add support for a pair of device tree properties which specify
if the CPR ceiling voltage may be reduced to either the per-fuse-
corner initial voltage fuse value or the per-virtual-corner
interpolated initial voltage value (i.e. the open-loop voltage).

These properties can be used to save power on targets where the
closed-loop settled CPR voltage never needs to exceed the
open-loop initial voltage.

Change-Id: I359b6d8e0c98f4b7f00f7bd90efc72c2aa3865a7
Signed-off-by: default avatarDavid Collins <collinsd@codeaurora.org>
parent d2a8c71b

Documentation/devicetree/bindings/regulator/cpr-regulator.txt

+9 −0
Original line number Diff line number Diff line
@@ -334,6 +334,14 @@ Optional properties: 
				voltages will be used in place of the per-fuse-corner floor voltages defined in the

				qcom,cpr-voltage-floor property.  If this property is not specified, then the

				per-fuse-corner floor voltages will always be used.

- qcom,cpr-init-voltage-as-ceiling: Boolean which indicates that the ceiling voltage used for a given virtual

				corner may be reduced to the per-fuse-corner initial voltage fuse value.

- qcom,cpr-scaled-init-voltage-as-ceiling: Boolean which indicates that the ceiling voltage used for a given

				virtual corner may be reduced to the interpolated, per-virtual-corner initial

				voltage value.  Note that if both qcom,cpr-init-voltage-as-ceiling and

				qcom,cpr-scaled-init-voltage-as-ceiling are specified, then

				qcom,cpr-scaled-init-voltage-as-ceiling will take precedence since the interpolated

				voltages are necessarily less than or equal to the fused initial voltage values.

- qcom,cpr-voltage-scaling-factor-max: Array of values which define the maximum allowed scaling factor to apply

				when calculating per-corner initial voltage values for each fuse corner.  The

				array must be of length equal to the value of the qcom,cpr-fuse-corners property.
@@ -511,4 +519,5 @@ Example: 
				<1 1 1050000 1050000 1050000 1050000 1060000

				     1070000 1080000 1090000 1100000 1100000

				     1100000 1100000>;

		qcom,cpr-scaled-init-voltage-as-ceiling;

	};

drivers/regulator/cpr-regulator.c

+42 −0
Original line number Diff line number Diff line
@@ -1784,6 +1784,43 @@ static int cpr_populate_opp_table(struct cpr_regulator *cpr_vreg, 
	return 0;

}



/*

 * Conditionally reduce the per-virtual-corner ceiling voltages if certain

 * device tree flags are present.  This must be called only after the ceiling

 * array has been initialized and the open_loop_volt array values have been

 * initialized and limited to the existing floor to ceiling voltage range.

 */

static int cpr_reduce_ceiling_voltage(struct cpr_regulator *cpr_vreg,

				struct device *dev)

{

	bool reduce_to_fuse_open_loop, reduce_to_interpolated_open_loop;

	int i;



	reduce_to_fuse_open_loop = of_property_read_bool(dev->of_node,

				"qcom,cpr-init-voltage-as-ceiling");

	reduce_to_interpolated_open_loop = of_property_read_bool(dev->of_node,

				"qcom,cpr-scaled-init-voltage-as-ceiling");



	if (!reduce_to_fuse_open_loop && !reduce_to_interpolated_open_loop)

		return 0;



	for (i = CPR_CORNER_MIN; i <= cpr_vreg->num_corners; i++) {

		if (reduce_to_interpolated_open_loop &&

		    cpr_vreg->open_loop_volt[i] < cpr_vreg->ceiling_volt[i])

			cpr_vreg->ceiling_volt[i] = cpr_vreg->open_loop_volt[i];

		else if (reduce_to_fuse_open_loop &&

				cpr_vreg->pvs_corner_v[cpr_vreg->corner_map[i]]

				< cpr_vreg->ceiling_volt[i])

			cpr_vreg->ceiling_volt[i]

				= max((u32)cpr_vreg->floor_volt[i],

			       cpr_vreg->pvs_corner_v[cpr_vreg->corner_map[i]]);

		cpr_debug(cpr_vreg, "lowered ceiling[%d] = %d uV\n",

			i, cpr_vreg->ceiling_volt[i]);

	}



	return 0;

}



/*

 * cpr_get_corner_quot_adjustment() -- get the quot_adjust for each corner.

 *
@@ -2702,6 +2739,11 @@ static int cpr_init_cpr(struct platform_device *pdev, 
	if (rc)

		return rc;



	/* Reduce the ceiling voltage if allowed. */

	rc = cpr_reduce_ceiling_voltage(cpr_vreg, &pdev->dev);

	if (rc)

		return rc;



	/* Init all voltage set points of APC regulator for CPR */

	rc = cpr_init_cpr_voltages(cpr_vreg, &pdev->dev);

	if (rc)