Loading Documentation/devicetree/bindings/arm/msm/lpm-workarounds.txt 0 → 100644 +23 −0 Original line number Diff line number Diff line * LPM Workarounds The required properties are: - compatible: "qcom,lpm-workarounds" The optional properties are: - qcom,lpm-wa-cx-turbo-unvote: Indicates the workaround to unvote CX turbo vote when system is coming out of rpm assisted power collaspe. lpm-cx-supply is required if this is present. - lpm-cx-supply: will hold handle for CX regulator supply which is used to unvote. Example: qcom,lpm-workarounds { compatible = "qcom,lpm-workarounds"; lpm-cx-supply = <&pm8916_s2_corner>; qcom,lpm-wa-cx-turbo-unvote; } drivers/cpuidle/Makefile +1 −1 Original line number Diff line number Diff line Loading @@ -7,4 +7,4 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o obj-$(CONFIG_CPU_IDLE_CALXEDA) += cpuidle-calxeda.o obj-$(CONFIG_ARCH_KIRKWOOD) += cpuidle-kirkwood.o obj-$(CONFIG_MSM_PM) += lpm-levels.o lpm-levels-of.o obj-$(CONFIG_MSM_PM) += lpm-levels.o lpm-levels-of.o lpm-workarounds.o drivers/cpuidle/lpm-levels.c +8 −0 Original line number Diff line number Diff line Loading @@ -43,6 +43,7 @@ #include <asm/arch_timer.h> #include <asm/cacheflush.h> #include "lpm-levels.h" #include "lpm-workarounds.h" #include <trace/events/power.h> #define CREATE_TRACE_POINTS #include <trace/events/trace_msm_low_power.h> Loading Loading @@ -593,6 +594,13 @@ static void cluster_unprepare(struct lpm_cluster *cluster, level = &cluster->levels[cluster->last_level]; if (level->notify_rpm) { msm_rpm_exit_sleep(); /* If RPM bumps up CX to turbo, unvote CX turbo vote * during exit of rpm assisted power collapse to * reduce the power impact */ lpm_wa_cx_unvote_send(); msm_mpm_exit_sleep(from_idle); } Loading drivers/cpuidle/lpm-workarounds.c 0 → 100644 +134 −0 Original line number Diff line number Diff line /* Copyright (c) 2014, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/err.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/regulator/rpm-smd-regulator.h> static struct regulator *lpm_cx_reg; static struct work_struct dummy_vote_work; static struct workqueue_struct *lpm_wa_wq; static bool lpm_wa_cx_turbo_unvote; /* While exiting from RPM assisted power collapse on some targets like MSM8939 * the CX is bumped to turbo mode by RPM. To reduce the power impact, APSS * low power driver need to remove the CX turbo vote. */ static void send_dummy_cx_vote(struct work_struct *w) { if (lpm_cx_reg) { regulator_set_voltage(lpm_cx_reg, RPM_REGULATOR_CORNER_SUPER_TURBO, RPM_REGULATOR_CORNER_SUPER_TURBO); regulator_set_voltage(lpm_cx_reg, RPM_REGULATOR_CORNER_NONE, RPM_REGULATOR_CORNER_SUPER_TURBO); } } /* * lpm_wa_cx_unvote_send(): Unvote for CX turbo mode */ void lpm_wa_cx_unvote_send(void) { if (lpm_wa_cx_turbo_unvote) queue_work(lpm_wa_wq, &dummy_vote_work); } EXPORT_SYMBOL(lpm_wa_cx_unvote_send); static int lpm_wa_cx_unvote_init(struct platform_device *pdev) { int ret = 0; lpm_cx_reg = devm_regulator_get(&pdev->dev, "lpm-cx"); if (IS_ERR(lpm_cx_reg)) { ret = PTR_ERR(lpm_cx_reg); if (ret != -EPROBE_DEFER) pr_err("Unable to get the CX regulator\n"); return ret; } INIT_WORK(&dummy_vote_work, send_dummy_cx_vote); lpm_wa_wq = alloc_workqueue("lpm-wa", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1); return ret; } static int lpm_wa_cx_unvote_exit(void) { if (lpm_wa_wq) destroy_workqueue(lpm_wa_wq); return 0; } static int lpm_wa_probe(struct platform_device *pdev) { int ret = 0; lpm_wa_cx_turbo_unvote = of_property_read_bool(pdev->dev.of_node, "qcom,lpm-wa-cx-turbo-unvote"); if (lpm_wa_cx_turbo_unvote) { ret = lpm_wa_cx_unvote_init(pdev); if (ret) { pr_err("%s: Failed to initialize lpm_wa_cx_unvote (%d)\n", __func__, ret); return ret; } } return ret; } static int lpm_wa_remove(struct platform_device *pdev) { int ret = 0; if (lpm_wa_cx_turbo_unvote) ret = lpm_wa_cx_unvote_exit(); return ret; } static struct of_device_id lpm_wa_mtch_tbl[] = { {.compatible = "qcom,lpm-workarounds"}, {}, }; static struct platform_driver lpm_wa_driver = { .probe = lpm_wa_probe, .remove = lpm_wa_remove, .driver = { .name = "lpm-workarounds", .owner = THIS_MODULE, .of_match_table = lpm_wa_mtch_tbl, }, }; static int __init lpm_wa_module_init(void) { int ret; ret = platform_driver_register(&lpm_wa_driver); if (ret) pr_info("Error registering %s\n", lpm_wa_driver.driver.name); return ret; } late_initcall(lpm_wa_module_init); drivers/cpuidle/lpm-workarounds.h 0 → 100644 +19 −0 Original line number Diff line number Diff line /* Copyright (c) 2014, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __LPM_WA_H #define __LPM_WA_H void lpm_wa_cx_unvote_send(void); #endif /* __LPM_WA_H */ Loading
Documentation/devicetree/bindings/arm/msm/lpm-workarounds.txt 0 → 100644 +23 −0 Original line number Diff line number Diff line * LPM Workarounds The required properties are: - compatible: "qcom,lpm-workarounds" The optional properties are: - qcom,lpm-wa-cx-turbo-unvote: Indicates the workaround to unvote CX turbo vote when system is coming out of rpm assisted power collaspe. lpm-cx-supply is required if this is present. - lpm-cx-supply: will hold handle for CX regulator supply which is used to unvote. Example: qcom,lpm-workarounds { compatible = "qcom,lpm-workarounds"; lpm-cx-supply = <&pm8916_s2_corner>; qcom,lpm-wa-cx-turbo-unvote; }
drivers/cpuidle/Makefile +1 −1 Original line number Diff line number Diff line Loading @@ -7,4 +7,4 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o obj-$(CONFIG_CPU_IDLE_CALXEDA) += cpuidle-calxeda.o obj-$(CONFIG_ARCH_KIRKWOOD) += cpuidle-kirkwood.o obj-$(CONFIG_MSM_PM) += lpm-levels.o lpm-levels-of.o obj-$(CONFIG_MSM_PM) += lpm-levels.o lpm-levels-of.o lpm-workarounds.o
drivers/cpuidle/lpm-levels.c +8 −0 Original line number Diff line number Diff line Loading @@ -43,6 +43,7 @@ #include <asm/arch_timer.h> #include <asm/cacheflush.h> #include "lpm-levels.h" #include "lpm-workarounds.h" #include <trace/events/power.h> #define CREATE_TRACE_POINTS #include <trace/events/trace_msm_low_power.h> Loading Loading @@ -593,6 +594,13 @@ static void cluster_unprepare(struct lpm_cluster *cluster, level = &cluster->levels[cluster->last_level]; if (level->notify_rpm) { msm_rpm_exit_sleep(); /* If RPM bumps up CX to turbo, unvote CX turbo vote * during exit of rpm assisted power collapse to * reduce the power impact */ lpm_wa_cx_unvote_send(); msm_mpm_exit_sleep(from_idle); } Loading
drivers/cpuidle/lpm-workarounds.c 0 → 100644 +134 −0 Original line number Diff line number Diff line /* Copyright (c) 2014, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/err.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/regulator/rpm-smd-regulator.h> static struct regulator *lpm_cx_reg; static struct work_struct dummy_vote_work; static struct workqueue_struct *lpm_wa_wq; static bool lpm_wa_cx_turbo_unvote; /* While exiting from RPM assisted power collapse on some targets like MSM8939 * the CX is bumped to turbo mode by RPM. To reduce the power impact, APSS * low power driver need to remove the CX turbo vote. */ static void send_dummy_cx_vote(struct work_struct *w) { if (lpm_cx_reg) { regulator_set_voltage(lpm_cx_reg, RPM_REGULATOR_CORNER_SUPER_TURBO, RPM_REGULATOR_CORNER_SUPER_TURBO); regulator_set_voltage(lpm_cx_reg, RPM_REGULATOR_CORNER_NONE, RPM_REGULATOR_CORNER_SUPER_TURBO); } } /* * lpm_wa_cx_unvote_send(): Unvote for CX turbo mode */ void lpm_wa_cx_unvote_send(void) { if (lpm_wa_cx_turbo_unvote) queue_work(lpm_wa_wq, &dummy_vote_work); } EXPORT_SYMBOL(lpm_wa_cx_unvote_send); static int lpm_wa_cx_unvote_init(struct platform_device *pdev) { int ret = 0; lpm_cx_reg = devm_regulator_get(&pdev->dev, "lpm-cx"); if (IS_ERR(lpm_cx_reg)) { ret = PTR_ERR(lpm_cx_reg); if (ret != -EPROBE_DEFER) pr_err("Unable to get the CX regulator\n"); return ret; } INIT_WORK(&dummy_vote_work, send_dummy_cx_vote); lpm_wa_wq = alloc_workqueue("lpm-wa", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1); return ret; } static int lpm_wa_cx_unvote_exit(void) { if (lpm_wa_wq) destroy_workqueue(lpm_wa_wq); return 0; } static int lpm_wa_probe(struct platform_device *pdev) { int ret = 0; lpm_wa_cx_turbo_unvote = of_property_read_bool(pdev->dev.of_node, "qcom,lpm-wa-cx-turbo-unvote"); if (lpm_wa_cx_turbo_unvote) { ret = lpm_wa_cx_unvote_init(pdev); if (ret) { pr_err("%s: Failed to initialize lpm_wa_cx_unvote (%d)\n", __func__, ret); return ret; } } return ret; } static int lpm_wa_remove(struct platform_device *pdev) { int ret = 0; if (lpm_wa_cx_turbo_unvote) ret = lpm_wa_cx_unvote_exit(); return ret; } static struct of_device_id lpm_wa_mtch_tbl[] = { {.compatible = "qcom,lpm-workarounds"}, {}, }; static struct platform_driver lpm_wa_driver = { .probe = lpm_wa_probe, .remove = lpm_wa_remove, .driver = { .name = "lpm-workarounds", .owner = THIS_MODULE, .of_match_table = lpm_wa_mtch_tbl, }, }; static int __init lpm_wa_module_init(void) { int ret; ret = platform_driver_register(&lpm_wa_driver); if (ret) pr_info("Error registering %s\n", lpm_wa_driver.driver.name); return ret; } late_initcall(lpm_wa_module_init);
drivers/cpuidle/lpm-workarounds.h 0 → 100644 +19 −0 Original line number Diff line number Diff line /* Copyright (c) 2014, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __LPM_WA_H #define __LPM_WA_H void lpm_wa_cx_unvote_send(void); #endif /* __LPM_WA_H */
