135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regulator/rpm-smd-regulator.h>
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static struct regulator *lpm_cx_reg;
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static struct work_struct dummy_vote_work;
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static struct workqueue_struct *lpm_wa_wq;
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static bool lpm_wa_cx_turbo_unvote;
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/* While exiting from RPM assisted power collapse on some targets like MSM8939
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* the CX is bumped to turbo mode by RPM. To reduce the power impact, APSS
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* low power driver need to remove the CX turbo vote.
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*/
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static void send_dummy_cx_vote(struct work_struct *w)
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{
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if (lpm_cx_reg) {
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regulator_set_voltage(lpm_cx_reg,
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RPM_REGULATOR_CORNER_SUPER_TURBO,
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RPM_REGULATOR_CORNER_SUPER_TURBO);
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regulator_set_voltage(lpm_cx_reg,
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RPM_REGULATOR_CORNER_NONE,
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RPM_REGULATOR_CORNER_SUPER_TURBO);
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}
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}
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/*
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* lpm_wa_cx_unvote_send(): Unvote for CX turbo mode
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*/
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void lpm_wa_cx_unvote_send(void)
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{
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if (lpm_wa_cx_turbo_unvote)
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queue_work(lpm_wa_wq, &dummy_vote_work);
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}
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EXPORT_SYMBOL(lpm_wa_cx_unvote_send);
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static int lpm_wa_cx_unvote_init(struct platform_device *pdev)
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{
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int ret = 0;
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lpm_cx_reg = devm_regulator_get(&pdev->dev, "lpm-cx");
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if (IS_ERR(lpm_cx_reg)) {
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ret = PTR_ERR(lpm_cx_reg);
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if (ret != -EPROBE_DEFER)
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pr_err("Unable to get the CX regulator\n");
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return ret;
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}
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INIT_WORK(&dummy_vote_work, send_dummy_cx_vote);
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lpm_wa_wq = alloc_workqueue("lpm-wa",
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WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1);
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return ret;
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}
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static int lpm_wa_cx_unvote_exit(void)
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{
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if (lpm_wa_wq)
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destroy_workqueue(lpm_wa_wq);
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return 0;
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}
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static int lpm_wa_probe(struct platform_device *pdev)
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{
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int ret = 0;
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lpm_wa_cx_turbo_unvote = of_property_read_bool(pdev->dev.of_node,
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"qcom,lpm-wa-cx-turbo-unvote");
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if (lpm_wa_cx_turbo_unvote) {
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ret = lpm_wa_cx_unvote_init(pdev);
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if (ret) {
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pr_err("%s: Failed to initialize lpm_wa_cx_unvote (%d)\n",
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__func__, ret);
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return ret;
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}
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}
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return ret;
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}
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static int lpm_wa_remove(struct platform_device *pdev)
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{
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int ret = 0;
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if (lpm_wa_cx_turbo_unvote)
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ret = lpm_wa_cx_unvote_exit();
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return ret;
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}
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static struct of_device_id lpm_wa_mtch_tbl[] = {
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{.compatible = "qcom,lpm-workarounds"},
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{},
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};
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static struct platform_driver lpm_wa_driver = {
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.probe = lpm_wa_probe,
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.remove = lpm_wa_remove,
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.driver = {
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.name = "lpm-workarounds",
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.owner = THIS_MODULE,
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.of_match_table = lpm_wa_mtch_tbl,
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},
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};
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static int __init lpm_wa_module_init(void)
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{
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int ret;
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ret = platform_driver_register(&lpm_wa_driver);
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if (ret)
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pr_info("Error registering %s\n", lpm_wa_driver.driver.name);
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return ret;
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}
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late_initcall(lpm_wa_module_init);
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