diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-05 09:38:39 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-05 09:38:39 -0700 |
commit | 3c89adb0d11117f64d5b501730be7fb2bf53a479 (patch) | |
tree | c259aec20deed6c0a0773cfda3a11f58ec9a077d /drivers/cpufreq/qcom-cpufreq-kryo.c | |
parent | 11e7c21880617b8383ad8ad059ae9a07e5abe68e (diff) | |
parent | a24e16b1310ce7f474aa0caca0e66f0f174c022f (diff) |
Merge tag 'pm-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki:
"These include a significant update of the generic power domains
(genpd) and Operating Performance Points (OPP) frameworks, mostly
related to the introduction of power domain performance levels,
cpufreq updates (new driver for Qualcomm Kryo processors, updates of
the existing drivers, some core fixes, schedutil governor
improvements), PCI power management fixes, ACPI workaround for
EC-based wakeup events handling on resume from suspend-to-idle, and
major updates of the turbostat and pm-graph utilities.
Specifics:
- Introduce power domain performance levels into the the generic
power domains (genpd) and Operating Performance Points (OPP)
frameworks (Viresh Kumar, Rajendra Nayak, Dan Carpenter).
- Fix two issues in the runtime PM framework related to the
initialization and removal of devices using device links (Ulf
Hansson).
- Clean up the initialization of drivers for devices in PM domains
(Ulf Hansson, Geert Uytterhoeven).
- Fix a cpufreq core issue related to the policy sysfs interface
causing CPU online to fail for CPUs sharing one cpufreq policy in
some situations (Tao Wang).
- Make it possible to use platform-specific suspend/resume hooks in
the cpufreq-dt driver and make the Armada 37xx DVFS use that
feature (Viresh Kumar, Miquel Raynal).
- Optimize policy transition notifications in cpufreq (Viresh Kumar).
- Improve the iowait boost mechanism in the schedutil cpufreq
governor (Patrick Bellasi).
- Improve the handling of deferred frequency updates in the schedutil
cpufreq governor (Joel Fernandes, Dietmar Eggemann, Rafael Wysocki,
Viresh Kumar).
- Add a new cpufreq driver for Qualcomm Kryo (Ilia Lin).
- Fix and clean up some cpufreq drivers (Colin Ian King, Dmitry
Osipenko, Doug Smythies, Luc Van Oostenryck, Simon Horman, Viresh
Kumar).
- Fix the handling of PCI devices with the DPM_SMART_SUSPEND flag set
and update stale comments in the PCI core PM code (Rafael Wysocki).
- Work around an issue related to the handling of EC-based wakeup
events in the ACPI PM core during resume from suspend-to-idle if
the EC has been put into the low-power mode (Rafael Wysocki).
- Improve the handling of wakeup source objects in the PM core (Doug
Berger, Mahendran Ganesh, Rafael Wysocki).
- Update the driver core to prevent deferred probe from breaking
suspend/resume ordering (Feng Kan).
- Clean up the PM core somewhat (Bjorn Helgaas, Ulf Hansson, Rafael
Wysocki).
- Make the core suspend/resume code and cpufreq support the RT patch
(Sebastian Andrzej Siewior, Thomas Gleixner).
- Consolidate the PM QoS handling in cpuidle governors (Rafael
Wysocki).
- Fix a possible crash in the hibernation core (Tetsuo Handa).
- Update the rockchip-io Adaptive Voltage Scaling (AVS) driver (David
Wu).
- Update the turbostat utility (fixes, cleanups, new CPU IDs, new
command line options, built-in "Low Power Idle" counters support,
new POLL and POLL% columns) and add an entry for it to MAINTAINERS
(Len Brown, Artem Bityutskiy, Chen Yu, Laura Abbott, Matt Turner,
Prarit Bhargava, Srinivas Pandruvada).
- Update the pm-graph to version 5.1 (Todd Brandt).
- Update the intel_pstate_tracer utility (Doug Smythies)"
* tag 'pm-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (128 commits)
tools/power turbostat: update version number
tools/power turbostat: Add Node in output
tools/power turbostat: add node information into turbostat calculations
tools/power turbostat: remove num_ from cpu_topology struct
tools/power turbostat: rename num_cores_per_pkg to num_cores_per_node
tools/power turbostat: track thread ID in cpu_topology
tools/power turbostat: Calculate additional node information for a package
tools/power turbostat: Fix node and siblings lookup data
tools/power turbostat: set max_num_cpus equal to the cpumask length
tools/power turbostat: if --num_iterations, print for specific number of iterations
tools/power turbostat: Add Cannon Lake support
tools/power turbostat: delete duplicate #defines
x86: msr-index.h: Correct SNB_C1/C3_AUTO_UNDEMOTE defines
tools/power turbostat: Correct SNB_C1/C3_AUTO_UNDEMOTE defines
tools/power turbostat: add POLL and POLL% column
tools/power turbostat: Fix --hide Pk%pc10
tools/power turbostat: Build-in "Low Power Idle" counters support
tools/power turbostat: Don't make man pages executable
tools/power turbostat: remove blank lines
tools/power turbostat: a small C-states dump readability immprovement
...
Diffstat (limited to 'drivers/cpufreq/qcom-cpufreq-kryo.c')
-rw-r--r-- | drivers/cpufreq/qcom-cpufreq-kryo.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c new file mode 100644 index 000000000000..d049fe4b80c4 --- /dev/null +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c @@ -0,0 +1,212 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, The Linux Foundation. All rights reserved. + */ + +/* + * In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors, + * the CPU frequency subset and voltage value of each OPP varies + * based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables + * defines the voltage and frequency value based on the msm-id in SMEM + * and speedbin blown in the efuse combination. + * The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC + * to provide the OPP framework with required information. + * This is used to determine the voltage and frequency value for each OPP of + * operating-points-v2 table when it is parsed by the OPP framework. + */ + +#include <linux/cpu.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/nvmem-consumer.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_opp.h> +#include <linux/slab.h> +#include <linux/soc/qcom/smem.h> + +#define MSM_ID_SMEM 137 + +enum _msm_id { + MSM8996V3 = 0xF6ul, + APQ8096V3 = 0x123ul, + MSM8996SG = 0x131ul, + APQ8096SG = 0x138ul, +}; + +enum _msm8996_version { + MSM8996_V3, + MSM8996_SG, + NUM_OF_MSM8996_VERSIONS, +}; + +static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void) +{ + size_t len; + u32 *msm_id; + enum _msm8996_version version; + + msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len); + if (IS_ERR(msm_id)) + return NUM_OF_MSM8996_VERSIONS; + + /* The first 4 bytes are format, next to them is the actual msm-id */ + msm_id++; + + switch ((enum _msm_id)*msm_id) { + case MSM8996V3: + case APQ8096V3: + version = MSM8996_V3; + break; + case MSM8996SG: + case APQ8096SG: + version = MSM8996_SG; + break; + default: + version = NUM_OF_MSM8996_VERSIONS; + } + + return version; +} + +static int qcom_cpufreq_kryo_probe(struct platform_device *pdev) +{ + struct opp_table *opp_tables[NR_CPUS] = {0}; + struct platform_device *cpufreq_dt_pdev; + enum _msm8996_version msm8996_version; + struct nvmem_cell *speedbin_nvmem; + struct device_node *np; + struct device *cpu_dev; + unsigned cpu; + u8 *speedbin; + u32 versions; + size_t len; + int ret; + + cpu_dev = get_cpu_device(0); + if (NULL == cpu_dev) + ret = -ENODEV; + + msm8996_version = qcom_cpufreq_kryo_get_msm_id(); + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) { + dev_err(cpu_dev, "Not Snapdragon 820/821!"); + return -ENODEV; + } + + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); + if (IS_ERR(np)) + return PTR_ERR(np); + + ret = of_device_is_compatible(np, "operating-points-v2-kryo-cpu"); + if (!ret) { + of_node_put(np); + return -ENOENT; + } + + speedbin_nvmem = of_nvmem_cell_get(np, NULL); + of_node_put(np); + if (IS_ERR(speedbin_nvmem)) { + dev_err(cpu_dev, "Could not get nvmem cell: %ld\n", + PTR_ERR(speedbin_nvmem)); + return PTR_ERR(speedbin_nvmem); + } + + speedbin = nvmem_cell_read(speedbin_nvmem, &len); + nvmem_cell_put(speedbin_nvmem); + + switch (msm8996_version) { + case MSM8996_V3: + versions = 1 << (unsigned int)(*speedbin); + break; + case MSM8996_SG: + versions = 1 << ((unsigned int)(*speedbin) + 4); + break; + default: + BUG(); + break; + } + + for_each_possible_cpu(cpu) { + cpu_dev = get_cpu_device(cpu); + if (NULL == cpu_dev) { + ret = -ENODEV; + goto free_opp; + } + + opp_tables[cpu] = dev_pm_opp_set_supported_hw(cpu_dev, + &versions, 1); + if (IS_ERR(opp_tables[cpu])) { + ret = PTR_ERR(opp_tables[cpu]); + dev_err(cpu_dev, "Failed to set supported hardware\n"); + goto free_opp; + } + } + + cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1, + NULL, 0); + if (!IS_ERR(cpufreq_dt_pdev)) + return 0; + + ret = PTR_ERR(cpufreq_dt_pdev); + dev_err(cpu_dev, "Failed to register platform device\n"); + +free_opp: + for_each_possible_cpu(cpu) { + if (IS_ERR_OR_NULL(opp_tables[cpu])) + break; + dev_pm_opp_put_supported_hw(opp_tables[cpu]); + } + + return ret; +} + +static struct platform_driver qcom_cpufreq_kryo_driver = { + .probe = qcom_cpufreq_kryo_probe, + .driver = { + .name = "qcom-cpufreq-kryo", + }, +}; + +static const struct of_device_id qcom_cpufreq_kryo_match_list[] __initconst = { + { .compatible = "qcom,apq8096", }, + { .compatible = "qcom,msm8996", }, +}; + +/* + * Since the driver depends on smem and nvmem drivers, which may + * return EPROBE_DEFER, all the real activity is done in the probe, + * which may be defered as well. The init here is only registering + * the driver and the platform device. + */ +static int __init qcom_cpufreq_kryo_init(void) +{ + struct device_node *np = of_find_node_by_path("/"); + const struct of_device_id *match; + int ret; + + if (!np) + return -ENODEV; + + match = of_match_node(qcom_cpufreq_kryo_match_list, np); + of_node_put(np); + if (!match) + return -ENODEV; + + ret = platform_driver_register(&qcom_cpufreq_kryo_driver); + if (unlikely(ret < 0)) + return ret; + + ret = PTR_ERR_OR_ZERO(platform_device_register_simple( + "qcom-cpufreq-kryo", -1, NULL, 0)); + if (0 == ret) + return 0; + + platform_driver_unregister(&qcom_cpufreq_kryo_driver); + return ret; +} +module_init(qcom_cpufreq_kryo_init); + +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver"); +MODULE_LICENSE("GPL v2"); |