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Commit 0901f3e8 authored by Anirudh Ghayal's avatar Anirudh Ghayal Committed by Gerrit - the friendly Code Review server
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regulator: cpr-regulator: Add support for mem-acc regulator requests 



The memory accelerator controls delays while accessing
memories. These delays vary based on the power-mode.
Provide the power-mode (corner) information from CPR
to the memory accelerator driver through the regulator
interface.

Change-Id: I9c13df1695d760aa7b4797f3ba5dc65590cf21e6
Signed-off-by: default avatarAnirudh Ghayal <aghayal@codeaurora.org>
parent ced3bc99

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

+3 −0
Original line number Diff line number Diff line
@@ -275,6 +275,9 @@ Optional properties: 
- qcom,cpr-init-voltage-step:	The voltage step size in microvolts of the CPR initial voltage fuses described by the

				qcom,cpr-fuse-init-voltage property.

				This property is required if qcom,cpr-fuse-init-voltage is present.

- mem-acc-supply:		Regulator to vote for the memory accelerator configuration.

				Not Present: memory accelerator configuration not supported.



Example:

	apc_vreg_corner: regulator@f9018000 {

		status = "okay";

drivers/regulator/cpr-regulator.c

+39 −7
Original line number Diff line number Diff line
@@ -189,6 +189,9 @@ struct cpr_regulator { 
	int			vdd_mx_vmin;

	int			vdd_mx_corner_map[CPR_FUSE_CORNER_MAX];



	/* mem-acc regulator */

	struct regulator	*mem_acc_vreg;



	/* CPR parameters */

	u64		cpr_fuse_bits;

	bool		cpr_fuse_disable;
@@ -550,15 +553,15 @@ static int cpr_scale_voltage(struct cpr_regulator *cpr_vreg, int corner, 
			     int new_apc_volt, enum voltage_change_dir dir)

{

	int rc = 0, vdd_mx_vmin = 0;

	int fuse_corner = cpr_vreg->corner_map[corner];



	/* No MX scaling if no vdd_mx */

	if (cpr_vreg->vdd_mx == NULL)

		dir = NO_CHANGE;



	if (dir != NO_CHANGE) {

	/* Determine the vdd_mx voltage */

	if (dir != NO_CHANGE && cpr_vreg->vdd_mx != NULL)

		vdd_mx_vmin = cpr_mx_get(cpr_vreg, corner, new_apc_volt);

	}



	if (cpr_vreg->mem_acc_vreg && dir == DOWN)

		rc = regulator_set_voltage(cpr_vreg->mem_acc_vreg,

					fuse_corner, fuse_corner);



	if (vdd_mx_vmin && dir == UP) {

		if (vdd_mx_vmin != cpr_vreg->vdd_mx_vmin)
@@ -568,6 +571,10 @@ static int cpr_scale_voltage(struct cpr_regulator *cpr_vreg, int corner, 
	if (!rc)

		rc = cpr_apc_set(cpr_vreg, new_apc_volt);



	if (!rc && cpr_vreg->mem_acc_vreg && dir == UP)

		rc = regulator_set_voltage(cpr_vreg->mem_acc_vreg,

					fuse_corner, fuse_corner);



	if (!rc && vdd_mx_vmin && dir == DOWN) {

		if (vdd_mx_vmin != cpr_vreg->vdd_mx_vmin)

			rc = cpr_mx_set(cpr_vreg, corner, vdd_mx_vmin);
@@ -2145,6 +2152,25 @@ static int cpr_voltage_plan_init(struct platform_device *pdev, 
	return 0;

}



static int cpr_mem_acc_init(struct platform_device *pdev,

				struct cpr_regulator *cpr_vreg)

{

	int rc;



	if (of_property_read_bool(pdev->dev.of_node, "mem-acc-supply")) {

		cpr_vreg->mem_acc_vreg = devm_regulator_get(&pdev->dev,

							"mem-acc");

		if (IS_ERR_OR_NULL(cpr_vreg->mem_acc_vreg)) {

			rc = PTR_RET(cpr_vreg->mem_acc_vreg);

			if (rc != -EPROBE_DEFER)

				pr_err("devm_regulator_get: mem-acc: rc=%d\n",

				       rc);

			return rc;

		}

	}

	return 0;

}



#if defined(CONFIG_DEBUG_FS)



static ssize_t cpr_debugfs_read(struct file *file, char __user *buff,
@@ -2291,6 +2317,12 @@ static int cpr_regulator_probe(struct platform_device *pdev) 
		return -ENOMEM;

	}



	rc = cpr_mem_acc_init(pdev, cpr_vreg);

	if (rc) {

		pr_err("mem_acc intialization error rc=%d\n", rc);

		return rc;

	}



	rc = cpr_efuse_init(pdev, cpr_vreg);

	if (rc) {

		pr_err("Wrong eFuse address specified: rc=%d\n", rc);