Граф коммитов

82 Коммитов

Автор SHA1 Сообщение Дата
YueHaibing 27ff8187f1 opp: Fix return in _opp_add_static_v2()
Fix sparse warning:
drivers/opp/of.c:924 _opp_add_static_v2() warn: passing zero to 'ERR_PTR'

For duplicate OPPs 'ret' be set to zero.

Fixes: deac8703da ("PM / OPP: _of_add_opp_table_v2(): increment count only if OPP is added")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-10-08 13:24:46 +05:30
Dmitry Osipenko e69709f686 opp: Add more resource-managed variants of dev_pm_opp_of_add_table()
Add resource-managed variants of dev_pm_opp_of_add_table_indexed() and
dev_pm_opp_of_add_table_noclk(), allowing drivers to remove boilerplate
code.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Added underscore to devm_of_add_table_indexed() ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-10-04 16:33:15 +05:30
Pavankumar Kondeti 8b7912f4cb opp: Fix required-opps phandle array count check
The 'required-opps' property is optional. So of_count_phandle_with_args()
can return -ENOENT when queried for required-opps. Handle this case.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-10-04 12:23:09 +05:30
Rafael J. Wysocki bc0d0b1dfe Merge back new PM domains material for v5.15. 2021-08-30 19:20:32 +02:00
Rajendra Nayak 020d86fc0d opp: Don't print an error if required-opps is missing
The 'required-opps' property is considered optional, hence remove
the pr_err() in of_parse_required_opp() when we find the property is
missing.
While at it, also fix the return value of
of_get_required_opp_performance_state() when of_parse_required_opp()
fails, return a -ENODEV instead of the -EINVAL.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-08-16 18:45:29 +02:00
Michał Mirosław 335ffab3ef opp: remove WARN when no valid OPPs remain
This WARN can be triggered per-core and the stack trace is not useful.
Replace it with plain dev_err(). Fix a comment while at it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-08-04 09:31:25 +05:30
Hsin-Yi Wang 4fa82a87ba opp: Allow required-opps to be used for non genpd use cases
Don't limit required_opp_table to genpd only. One possible use case is
cpufreq based devfreq governor, which can use required-opps property to
derive devfreq from cpufreq.

Though the OPP core still doesn't support non-genpd required-opps in
_set_required_opps().

Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
[ Viresh: Update _set_required_opps() to check for genpd ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-06-18 09:00:55 +05:30
Yang Yingliang ac9fd3c803 opp: use list_del_init instead of list_del/INIT_LIST_HEAD
Using list_del_init() instead of list_del() + INIT_LIST_HEAD()
to simpify the code.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-05-20 09:32:40 +05:30
Yangtao Li 3d5cfbb695 opp: Add devres wrapper for dev_pm_opp_of_add_table
Add devres wrapper for dev_pm_opp_of_add_table() to simplify drivers
code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-03-15 09:26:53 +05:30
Viresh Kumar 7eba0c7641 opp: Allow lazy-linking of required-opps
The OPP core currently requires the required opp tables to be available
before the dependent OPP table is added, as it needs to create links
from the dependent OPP table to the required ones. This may not be
convenient for all the platforms though, as this requires strict
ordering for probing the drivers.

This patch allows lazy-linking of the required-opps. The OPP tables for
which the required-opp-tables aren't available at the time of their
initialization, are added to a special list of OPP tables:
lazy_opp_tables. Later on, whenever a new OPP table is registered with
the OPP core, we check if it is required by an OPP table in the pending
list; if yes, then we complete the linking then and there.

An OPP table is marked unusable until the time all its required-opp
tables are available. And if lazy-linking fails for an OPP table, the
OPP core disables all of its OPPs to make sure no one can use them.

Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-02-02 10:30:53 +05:30
Dmitry Osipenko b6ecd5d4f6 opp: Print OPP level in debug message of _opp_add_static_v2()
Print OPP level in debug message of _opp_add_static_v2(). This helps to
chase GENPD bugs.

Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-02-02 10:27:36 +05:30
Viresh Kumar 559fef0dfd opp: Add dev_pm_opp_of_add_table_noclk()
A few drivers have device's clk but they don't want the OPP core to
handle that. Add a new helper for them, dev_pm_opp_of_add_table_noclk().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
2021-02-02 10:27:26 +05:30
Viresh Kumar 32439ac753 opp: Defer acquiring the clk until OPPs are added
We acquire the clk at the time the OPP table is allocated, though it
works fine, it is not the best place to do so. One of the main reason
being we may need to acquire it again from dev_pm_opp_set_clkname() if
the platform wants another clock to be acquired instead.

There is also requirement from some of the platforms where they do not
want the OPP core to manage the clock at all.

This patch hence defers acquiring the clk until the time we are certain
about which clk we need to acquire and if we really need to acquire one.
With this commit, the clk will get acquired either from
dev_pm_opp_set_clkname() or while we initialize the OPPs within the
table.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
2021-02-02 10:27:20 +05:30
Viresh Kumar 406e476521 opp: Create _of_add_table_indexed() to reduce code duplication
The implementation of dev_pm_opp_of_add_table() and
dev_pm_opp_of_add_table_indexed() are almost identical. Create
_of_add_table_indexed() to reduce code redundancy.

Also remove the duplication of the doc style comments by referring to
dev_pm_opp_of_add_table() from dev_pm_opp_of_add_table_indexed().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
2021-02-02 10:27:06 +05:30
Dmitry Osipenko d7b9d9b31a opp: Correct debug message in _opp_add_static_v2()
The debug message always prints rate=0 instead of a proper value, fix it.

Fixes: 6c591eec67 ("OPP: Add helpers for reading the binding properties")
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Added Fixes tag ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2021-02-02 10:26:56 +05:30
Rafael J. Wysocki e1f1320fc0 Merge branch 'pm-cpufreq'
* pm-cpufreq: (31 commits)
  cpufreq: Fix cpufreq_online() return value on errors
  cpufreq: Fix up several kerneldoc comments
  cpufreq: stats: Use local_clock() instead of jiffies
  cpufreq: schedutil: Simplify sugov_update_next_freq()
  cpufreq: intel_pstate: Simplify intel_cpufreq_update_pstate()
  cpufreq: arm_scmi: Discover the power scale in performance protocol
  firmware: arm_scmi: Add power_scale_mw_get() interface
  cpufreq: tegra194: Rename tegra194_get_speed_common function
  cpufreq: tegra194: Remove unnecessary frequency calculation
  cpufreq: tegra186: Simplify cluster information lookup
  cpufreq: tegra186: Fix sparse 'incorrect type in assignment' warning
  cpufreq: imx: fix NVMEM_IMX_OCOTP dependency
  cpufreq: vexpress-spc: Add missing MODULE_ALIAS
  cpufreq: scpi: Add missing MODULE_ALIAS
  cpufreq: loongson1: Add missing MODULE_ALIAS
  cpufreq: sun50i: Add missing MODULE_DEVICE_TABLE
  cpufreq: st: Add missing MODULE_DEVICE_TABLE
  cpufreq: qcom: Add missing MODULE_DEVICE_TABLE
  cpufreq: mediatek: Add missing MODULE_DEVICE_TABLE
  cpufreq: highbank: Add missing MODULE_DEVICE_TABLE
  ...
2020-12-15 15:24:52 +01:00
Viresh Kumar 2c07b0fd9b Merge branch 'opp/empty' into opp/linux-next 2020-12-09 11:24:12 +05:30
Nicola Mazzucato 6ee70e8c34 opp: of: Allow empty opp-table with opp-shared
The opp binding now allows to have an empty opp table and shared-opp to
still describe that devices share v/f lines.

When initialising an empty opp table, allow such case by:
- treating such conditions with warnings in place of errors
- don't fail on empty table

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-12-09 11:23:46 +05:30
Viresh Kumar e77dcb0b73 opp: Don't create an OPP table from dev_pm_opp_get_opp_table()
It has been found that some users (like cpufreq-dt and others on LKML)
have abused the helper dev_pm_opp_get_opp_table() to create the OPP
table instead of just finding it, which is the wrong thing to do. This
routine was meant for OPP core's internal working and exposed the whole
functionality by mistake.

Change the scope of dev_pm_opp_get_opp_table() to only finding the
table. The internal helpers _opp_get_opp_table*() are thus renamed to
_add_opp_table*(), dev_pm_opp_get_opp_table_indexed() is removed (as we
don't need the index field for finding the OPP table) and so the only
user, genpd, is updated.

Note that the prototype of _add_opp_table() was already left in opp.h by
mistake when it was removed earlier and so we weren't required to add it
now.

Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-12-09 11:21:11 +05:30
Lukasz Luba c250d50fe2 PM: EM: Add a flag indicating units of power values in Energy Model
There are different platforms and devices which might use different scale
for the power values. Kernel sub-systems might need to check if all
Energy Model (EM) devices are using the same scale. Address that issue and
store the information inside EM for each device. Thanks to that they can
be easily compared and proper action triggered.

Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Quentin Perret <qperret@google.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-11-10 20:22:00 +01:00
Viresh Kumar 27c09484dd opp: Allocate the OPP table outside of opp_table_lock
There is no critical section which needs protection with locks while
allocating an OPP table, except while adding it to the opp_tables list.
And taking the opp_table_lock for the entire duration causes circular
dependency issues like the one mentioned below.  This patch takes
another approach to reduce the size of the critical section to avoid
such issues, the details of that are present within the patch.

 ======================================================
 WARNING: possible circular locking dependency detected
 5.4.72 #14 Not tainted
 ------------------------------------------------------
 chrome/1865 is trying to acquire lock:
 ffffffdd34921750 (opp_table_lock){+.+.}, at: _find_opp_table+0x34/0x74

 but task is already holding lock:
 ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec

 fscrypt: AES-256-CTS-CBC using implementation "cts-cbc-aes-ce"
 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:
 -> #4 (reservation_ww_class_mutex){+.+.}:
        __mutex_lock_common+0xec/0xc0c
        ww_mutex_lock_interruptible+0x5c/0xc4
        msm_gem_fault+0x2c/0x124
        __do_fault+0x40/0x16c
        handle_mm_fault+0x7cc/0xd98
        do_page_fault+0x230/0x3b4
        do_translation_fault+0x5c/0x78
        do_mem_abort+0x4c/0xb4
        el0_da+0x1c/0x20
 -> #3 (&mm->mmap_sem){++++}:
        __might_fault+0x70/0x98
        compat_filldir+0xf8/0x48c
        dcache_readdir+0x70/0x1dc
        iterate_dir+0xd4/0x180
        __arm64_compat_sys_getdents+0xa0/0x19c
        el0_svc_common+0xa8/0x178
        el0_svc_compat_handler+0x2c/0x40
        el0_svc_compat+0x8/0x10
 -> #2 (&sb->s_type->i_mutex_key#3){++++}:
        down_write+0x54/0x16c
        start_creating+0x68/0x128
        debugfs_create_dir+0x28/0x114
        opp_debug_register+0x8c/0xc0
        _add_opp_dev_unlocked+0x5c/0x70
        _add_opp_dev+0x38/0x58
        _opp_get_opp_table+0xdc/0x1ac
        dev_pm_opp_get_opp_table_indexed+0x24/0x30
        dev_pm_opp_of_add_table_indexed+0x48/0x84
        of_genpd_add_provider_onecell+0xc0/0x1b8
        rpmhpd_probe+0x240/0x268
        platform_drv_probe+0x90/0xb0
        really_probe+0x134/0x2ec
        driver_probe_device+0x64/0xfc
        __device_attach_driver+0x8c/0xa4
        bus_for_each_drv+0x90/0xd8
        __device_attach+0xc0/0x148
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x34/0x94
        device_add+0x1fc/0x3b0
        of_device_add+0x3c/0x4c
        of_platform_device_create_pdata+0xb8/0xfc
        of_platform_bus_create+0x1e4/0x368
        of_platform_populate+0x70/0xbc
        devm_of_platform_populate+0x58/0xa0
        rpmh_rsc_probe+0x36c/0x3cc
        platform_drv_probe+0x90/0xb0
        really_probe+0x134/0x2ec
        driver_probe_device+0x64/0xfc
        __device_attach_driver+0x8c/0xa4
        bus_for_each_drv+0x90/0xd8
        __device_attach+0xc0/0x148
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x34/0x94
        device_add+0x1fc/0x3b0
        of_device_add+0x3c/0x4c
        of_platform_device_create_pdata+0xb8/0xfc
        of_platform_bus_create+0x1e4/0x368
        of_platform_bus_create+0x230/0x368
        of_platform_populate+0x70/0xbc
        of_platform_default_populate_init+0xa8/0xc0
        do_one_initcall+0x1c8/0x3fc
        do_initcall_level+0xb4/0x10c
        do_basic_setup+0x30/0x48
        kernel_init_freeable+0x124/0x1a4
        kernel_init+0x14/0x104
        ret_from_fork+0x10/0x18
 -> #1 (&opp_table->lock){+.+.}:
        __mutex_lock_common+0xec/0xc0c
        mutex_lock_nested+0x40/0x50
        _add_opp_dev+0x2c/0x58
        _opp_get_opp_table+0xdc/0x1ac
        dev_pm_opp_get_opp_table_indexed+0x24/0x30
        dev_pm_opp_of_add_table_indexed+0x48/0x84
        of_genpd_add_provider_onecell+0xc0/0x1b8
        rpmhpd_probe+0x240/0x268
        platform_drv_probe+0x90/0xb0
        really_probe+0x134/0x2ec
        driver_probe_device+0x64/0xfc
        __device_attach_driver+0x8c/0xa4
        bus_for_each_drv+0x90/0xd8
        __device_attach+0xc0/0x148
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x34/0x94
        device_add+0x1fc/0x3b0
        of_device_add+0x3c/0x4c
        of_platform_device_create_pdata+0xb8/0xfc
        of_platform_bus_create+0x1e4/0x368
        of_platform_populate+0x70/0xbc
        devm_of_platform_populate+0x58/0xa0
        rpmh_rsc_probe+0x36c/0x3cc
        platform_drv_probe+0x90/0xb0
        really_probe+0x134/0x2ec
        driver_probe_device+0x64/0xfc
        __device_attach_driver+0x8c/0xa4
        bus_for_each_drv+0x90/0xd8
        __device_attach+0xc0/0x148
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x34/0x94
        device_add+0x1fc/0x3b0
        of_device_add+0x3c/0x4c
        of_platform_device_create_pdata+0xb8/0xfc
        of_platform_bus_create+0x1e4/0x368
        of_platform_populate+0x70/0xbc
        devm_of_platform_populate+0x58/0xa0
        rpmh_rsc_probe+0x36c/0x3cc
        platform_drv_probe+0x90/0xb0
        really_probe+0x134/0x2ec
        driver_probe_device+0x64/0xfc
        __device_attach_driver+0x8c/0xa4
        bus_for_each_drv+0x90/0xd8
        __device_attach+0xc0/0x148
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x34/0x94
        device_add+0x1fc/0x3b0
        of_device_add+0x3c/0x4c
        of_platform_device_create_pdata+0xb8/0xfc
        of_platform_bus_create+0x1e4/0x368
        of_platform_bus_create+0x230/0x368
        of_platform_populate+0x70/0xbc
        of_platform_default_populate_init+0xa8/0xc0
        do_one_initcall+0x1c8/0x3fc
        do_initcall_level+0xb4/0x10c
        do_basic_setup+0x30/0x48
        kernel_init_freeable+0x124/0x1a4
        kernel_init+0x14/0x104
        ret_from_fork+0x10/0x18
 -> #0 (opp_table_lock){+.+.}:
        __lock_acquire+0xee4/0x2450
        lock_acquire+0x1cc/0x210
        __mutex_lock_common+0xec/0xc0c
        mutex_lock_nested+0x40/0x50
        _find_opp_table+0x34/0x74
        dev_pm_opp_find_freq_exact+0x2c/0xdc
        a6xx_gmu_resume+0xc8/0xecc
        a6xx_pm_resume+0x148/0x200
        adreno_resume+0x28/0x34
        pm_generic_runtime_resume+0x34/0x48
        __rpm_callback+0x70/0x10c
        rpm_callback+0x34/0x8c
        rpm_resume+0x414/0x550
        __pm_runtime_resume+0x7c/0xa0
        msm_gpu_submit+0x60/0x1c0
        msm_ioctl_gem_submit+0xadc/0xb60
        drm_ioctl_kernel+0x9c/0x118
        drm_ioctl+0x27c/0x408
        drm_compat_ioctl+0xcc/0xdc
        __se_compat_sys_ioctl+0x100/0x206c
        __arm64_compat_sys_ioctl+0x20/0x2c
        el0_svc_common+0xa8/0x178
        el0_svc_compat_handler+0x2c/0x40
        el0_svc_compat+0x8/0x10
 other info that might help us debug this:
 Chain exists of: opp_table_lock --> &mm->mmap_sem --> reservation_ww_class_mutex
  Possible unsafe locking scenario:
        CPU0                    CPU1
        ----                    ----
   lock(reservation_ww_class_mutex);
                                lock(&mm->mmap_sem);
                                lock(reservation_ww_class_mutex);
   lock(opp_table_lock);

 *** DEADLOCK ***

 3 locks held by chrome/1865:
  #0: ffffff81edecc0d8 (&dev->struct_mutex){+.+.}, at: msm_ioctl_gem_submit+0x264/0xb60
  #1: ffffff81d0000870 (reservation_ww_class_acquire){+.+.}, at: msm_ioctl_gem_submit+0x8e8/0xb60
  #2: ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec
 stack backtrace:
 CPU: 0 PID: 1865 Comm: chrome Not tainted 5.4.72 #14
 Hardware name: Google Lazor (rev1+) with LTE (DT)
 Call trace:
  dump_backtrace+0x0/0x158
  show_stack+0x20/0x2c
  dump_stack+0xc8/0x160
  print_circular_bug+0x2c4/0x2c8
  check_noncircular+0x1a8/0x1b0
  __lock_acquire+0xee4/0x2450
  lock_acquire+0x1cc/0x210
  __mutex_lock_common+0xec/0xc0c
  mutex_lock_nested+0x40/0x50
  _find_opp_table+0x34/0x74
  dev_pm_opp_find_freq_exact+0x2c/0xdc
  a6xx_gmu_resume+0xc8/0xecc
  a6xx_pm_resume+0x148/0x200
  adreno_resume+0x28/0x34
  pm_generic_runtime_resume+0x34/0x48
  __rpm_callback+0x70/0x10c
  rpm_callback+0x34/0x8c
  rpm_resume+0x414/0x550
  __pm_runtime_resume+0x7c/0xa0
  msm_gpu_submit+0x60/0x1c0
  msm_ioctl_gem_submit+0xadc/0xb60
  drm_ioctl_kernel+0x9c/0x118
  drm_ioctl+0x27c/0x408
  drm_compat_ioctl+0xcc/0xdc
  __se_compat_sys_ioctl+0x100/0x206c
  __arm64_compat_sys_ioctl+0x20/0x2c
  el0_svc_common+0xa8/0x178
  el0_svc_compat_handler+0x2c/0x40
  el0_svc_compat+0x8/0x10

Reported-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-11-06 12:50:02 +05:30
Viresh Kumar 1f6620f870 opp: Don't always remove static OPPs in _of_add_opp_table_v1()
The patch missed returning 0 early in case of success and hence the
static OPPs got removed by mistake. Fix it.

Fixes: 90d46d71cc ("opp: Handle multiple calls for same OPP table in _of_add_opp_table_v1()")
Reported-by: Aisheng Dong <aisheng.dong@nxp.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dong Aisheng <aisheng.dong@nxp.com>
2020-10-27 10:38:28 +05:30
Viresh Kumar a5663c9b1e opp: Allow opp-level to be set to 0
The DT bindings don't put such a constraint, nor should the kernel. It
is perfectly fine for opp-level to be set to 0, if we need to put the
performance state votes for a domain for a particular OPP.

Reported-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-09-16 14:02:34 +05:30
Viresh Kumar 0ff25c9904 opp: Allow opp-supported-hw to contain multiple versions
The bindings allow multiple versions to be passed to "opp-supported-hw"
property, either of which can result in enabling of the OPP.

Update code to allow that.

Tested-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-09-16 14:02:33 +05:30
Viresh Kumar 3a5578784d Merge branch 'opp/defer-probe' into HEAD 2020-09-16 14:02:23 +05:30
Viresh Kumar 90d46d71cc opp: Handle multiple calls for same OPP table in _of_add_opp_table_v1()
Until now for V1 OPP bindings we used to call
dev_pm_opp_of_cpumask_add_table() first and then
dev_pm_opp_set_sharing_cpus() in the cpufreq-dt driver.

A later patch will though update the cpufreq-dt driver to optimize the
code a bit and we will call dev_pm_opp_set_sharing_cpus() first followed
by dev_pm_opp_of_cpumask_add_table(), which doesn't work well today as
it tries to re parse the OPP entries. This should work nevertheless for
V1 bindings as the same works for V2 bindings.

Adapt the same approach from V2 bindings and fix this.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-09-16 13:56:08 +05:30
Stephan Gerhold dd461cd918 opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER
The OPP core manages various resources, e.g. clocks or interconnect paths.
These resources are looked up when the OPP table is allocated once
dev_pm_opp_get_opp_table() is called the first time (either directly
or indirectly through one of the many helper functions).

At this point, the resources may not be available yet, i.e. looking them
up will result in -EPROBE_DEFER. Unfortunately, dev_pm_opp_get_opp_table()
is currently unable to propagate this error code since it only returns
the allocated OPP table or NULL.

This means that all consumers of the OPP core are required to make sure
that all necessary resources are available. Usually this happens by
requesting them, checking the result and releasing them immediately after.

For example, we have added "dev_pm_opp_of_find_icc_paths(dev, NULL)" to
several drivers now just to make sure the interconnect providers are
ready before the OPP table is allocated. If this call is missing,
the OPP core will only warn about this and then attempt to continue
without interconnect. This will eventually fail horribly, e.g.:

    cpu cpu0: _allocate_opp_table: Error finding interconnect paths: -517
    ... later ...
    of: _read_bw: Mismatch between opp-peak-kBps and paths (1 0)
    cpu cpu0: _opp_add_static_v2: opp key field not found
    cpu cpu0: _of_add_opp_table_v2: Failed to add OPP, -22

This example happens when trying to use interconnects for a CPU OPP
table together with qcom-cpufreq-nvmem.c. qcom-cpufreq-nvmem calls
dev_pm_opp_set_supported_hw(), which ends up allocating the OPP table
early. To fix the problem with the current approach we would need to add
yet another call to dev_pm_opp_of_find_icc_paths(dev, NULL).
But actually qcom-cpufreq-nvmem.c has nothing to do with interconnects...

This commit attempts to make this more robust by allowing
dev_pm_opp_get_opp_table() to return an error pointer. Fixing all
the usages is trivial because the function is usually used indirectly
through another helper (e.g. dev_pm_opp_set_supported_hw() above).
These other helpers already return an error pointer.

The example above then works correctly because set_supported_hw() will
return -EPROBE_DEFER, and qcom-cpufreq-nvmem.c already propagates that
error. It should also be possible to remove the remaining usages of
"dev_pm_opp_of_find_icc_paths(dev, NULL)" from other drivers as well.

Note that this commit currently only handles -EPROBE_DEFER for the
clock/interconnects within _allocate_opp_table(). Other errors are just
ignored as before. Eventually those should be propagated as well.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
[ Viresh: skip checking return value of dev_pm_opp_get_opp_table() for
	  EPROBE_DEFER in domain.c, fix NULL return value and reorder
	  code a bit in core.c, and update exynos-asv.c ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-08-25 11:08:54 +05:30
Viresh Kumar 8aaf6264fc opp: Remove _dev_pm_opp_find_and_remove_table() wrapper
Remove the unnecessary wrapper and merge
_dev_pm_opp_find_and_remove_table() with dev_pm_opp_remove_table().

Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-08-24 17:04:37 +05:30
Rafael J. Wysocki 5b5642075c Merge branches 'pm-em' and 'pm-core'
* pm-em:
  OPP: refactor dev_pm_opp_of_register_em() and update related drivers
  Documentation: power: update Energy Model description
  PM / EM: change name of em_pd_energy to em_cpu_energy
  PM / EM: remove em_register_perf_domain
  PM / EM: add support for other devices than CPUs in Energy Model
  PM / EM: update callback structure and add device pointer
  PM / EM: introduce em_dev_register_perf_domain function
  PM / EM: change naming convention from 'capacity' to 'performance'

* pm-core:
  mmc: jz4740: Use pm_ptr() macro
  PM: Make *_DEV_PM_OPS macros use __maybe_unused
  PM: core: introduce pm_ptr() macro
2020-08-03 13:11:39 +02:00
Walter Lozano 6544abc520 opp: Increase parsed_static_opps in _of_add_opp_table_v1()
Currently, when using _of_add_opp_table_v2 parsed_static_opps is
increased and this value is used in _opp_remove_all_static() to
check if there are static opp entries that need to be freed.
Unfortunately this does not happen when using _of_add_opp_table_v1(),
which leads to warnings.

This patch increases parsed_static_opps in _of_add_opp_table_v1() in a
similar way as in _of_add_opp_table_v2().

Fixes: 03758d6026 ("opp: Replace list_kref with a local counter")
Cc: v5.6+ <stable@vger.kernel.org> # v5.6+
Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
[ Viresh: Do the operation with lock held and set the value to 1 instead
	  of incrementing it ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-07-16 08:50:54 +05:30
Lukasz Luba 0e0ffa855d OPP: refactor dev_pm_opp_of_register_em() and update related drivers
The Energy Model framework supports not only CPU devices. Drop the CPU
specific interface with cpumask and add struct device. Add also a return
value, user might use it. This new interface provides easy way to create
a simple Energy Model, which then might be used by e.g. thermal subsystem.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-06-24 17:16:42 +02:00
Lukasz Luba d0351cc3b0 PM / EM: update callback structure and add device pointer
The Energy Model framework is going to support devices other that CPUs. In
order to make this happen change the callback function and add pointer to
a device as an argument.

Update the related users to use new function and new callback from the
Energy Model.

Acked-by: Quentin Perret <qperret@google.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-06-24 17:14:07 +02:00
Sibi Sankar 45679f9b50 opp: Don't parse icc paths unnecessarily
The DT node of the device may contain interconnect paths while the OPP
table doesn't have the bandwidth values. There is no need to parse the
paths in such cases.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Tested-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
[ Viresh: Support the case of !opp_table and massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-06-01 13:10:15 +05:30
Georgi Djakov 120e117bdc opp: Add sanity checks in _read_opp_key()
When we read the OPP keys, it would be nice to do some sanity checks
of the values we get from DT and see if they match with the information
that is populated in the OPP table. Let's pass a pointer of the table,
so that we can do some validation.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
[ Viresh: Fix rebase conflicts ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-05-29 10:15:08 +05:30
Georgi Djakov 6d3f922c46 opp: Add support for parsing interconnect bandwidth
The OPP bindings now support bandwidth values, so add support to parse it
from device tree and store it into the new dev_pm_opp_icc_bw struct, which
is part of the dev_pm_opp.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
[ Viresh: Create _read_bw() and use it, renamed _of_find_icc_paths() to
	  dev_pm_opp_of_find_icc_paths(), exported it and made opp_table
	  argument optional. Also drop the depends on from Kconfig. ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-05-29 10:15:08 +05:30
Saravana Kannan 6c591eec67 OPP: Add helpers for reading the binding properties
The opp-hz DT property is not mandatory and we may use another property
as a key in the OPP table. Add helper functions to simplify the reading
and comparing the keys.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
[ Viresh: Removed an unnecessary comment ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-05-13 11:48:13 +05:30
Viresh Kumar 03758d6026 opp: Replace list_kref with a local counter
A kref or refcount isn't the right tool to be used here for counting
number of devices that are sharing the static OPPs created for the OPP
table. For example, we are reinitializing the kref again, after it
reaches a value of 0 and frees the resources, if the static OPPs get
added for the same OPP table structure (as the OPP table structure was
never freed). That is messy and very unclear.

This patch makes parsed_static_opps an unsigned integer and uses it to
count the number of users of the static OPPs. The increment and
decrement to parsed_static_opps is done under opp_table->lock now to
make sure no races are possible if the OPP table is getting added and
removed in parallel (which doesn't happen in practice, but can in
theory).

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-12-10 15:57:00 +05:30
Viresh Kumar ba00331921 opp: Free static OPPs on errors while adding them
The static OPPs aren't getting freed properly, if errors occur while
adding them. Fix that by calling _put_opp_list_kref() and putting their
reference on failures.

Fixes: 11e1a16482 ("opp: Don't decrement uninitialized list_kref")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-12-10 15:56:56 +05:30
Viresh Kumar b19c23551b opp: Reinitialize the list_kref before adding the static OPPs again
The list_kref reaches a count of 0 when all the static OPPs are removed,
for example when dev_pm_opp_of_cpumask_remove_table() is called, though
the actual OPP table may not get freed as it may still be referenced by
other parts of the kernel, like from a call to
dev_pm_opp_set_supported_hw(). And if we call
dev_pm_opp_of_cpumask_add_table() again at this point, we must
reinitialize the list_kref otherwise the kernel will hit a WARN() in
kref infrastructure for incrementing a kref with value 0.

Fixes: 11e1a16482 ("opp: Don't decrement uninitialized list_kref")
Reported-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-10-23 10:58:44 +05:30
Viresh Kumar f2edbb6699 opp: of: drop incorrect lockdep_assert_held()
_find_opp_of_np() doesn't traverse the list of OPP tables but instead
just the entries within an OPP table and so only requires to lock the
OPP table itself.

The lockdep_assert_held() was added there by mistake and isn't really
required.

Fixes: 5d6d106fa4 ("OPP: Populate required opp tables from "required-opps" property")
Cc: v5.0+ <stable@vger.kernel.org> # v5.0+
Reported-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-10-10 16:16:13 +05:30
Anson Huang 4527551750 opp: of: Support multiple suspend OPPs defined in DT
With property "opp-supported-hw" introduced, the OPP table
in DT could be a large OPP table and ONLY a subset of OPPs
are available, based on the version of the hardware running
on. That introduces restriction of using "opp-suspend"
property to define the suspend OPP, as we are NOT sure if the
OPP containing "opp-suspend" property is available for the
hardware running on, and the of opp core does NOT allow multiple
suspend OPPs defined in DT OPP table.

To eliminate this restrition, make of opp core allow multiple
suspend OPPs defined in DT, and pick the OPP with highest rate
and with "opp-suspend" property present to be suspend OPP, it
can speed up the suspend/resume process.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-07-26 13:25:52 +05:30
Viresh Kumar 11e1a16482 opp: Don't decrement uninitialized list_kref
The list_kref was added for static OPPs and to track their users. The
kref is initialized while the static OPPs are added, but removed
unconditionally even if the static OPPs were never added. This causes
refcount mismatch warnings currently.

Fix that by always initializing the kref when the OPP table is first
initialized. The refcount is later incremented only for the second user
onwards.

Fixes: d0e8ae6c26 ("OPP: Create separate kref for static OPPs list")
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-07-26 13:25:52 +05:30
Rafael J. Wysocki 41de256b6f Merge branch 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull operating performance points (OPP) framework changes for v5.3
from Viresh Kumar:

"This pull request contains:

 - OPP core changes to support a wider range of devices, like IO
   devices (Rajendra Nayak and Stehpen Boyd).
 - Fixes around genpd_virt_devs (Viresh Kumar).
 - Fix for platform with set_opp() callback (Dmitry Osipenko)."

* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
  opp: Don't use IS_ERR on invalid supplies
  opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes
  opp: Don't overwrite rounded clk rate
  opp: Allocate genpd_virt_devs from dev_pm_opp_attach_genpd()
  opp: Attach genpds to devices from within OPP core
2019-06-26 10:53:57 +02:00
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00
Viresh Kumar c0ab9e0812 opp: Allocate genpd_virt_devs from dev_pm_opp_attach_genpd()
Currently the space for the array of virtual devices is allocated along
with the OPP table, but that isn't going to work well from now onwards.
For single power domain case, a driver can either use the original
device structure for setting the performance state (if genpd attached
with dev_pm_domain_attach()) or use the virtual device structure (if
genpd attached with dev_pm_domain_attach_by_name(), which returns the
virtual device) and so we can't know in advance if we are going to need
genpd_virt_devs array or not.

Lets delay the allocation a bit and do it along with
dev_pm_opp_attach_genpd() rather. The deallocation is done from
dev_pm_opp_detach_genpd().

Tested-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-05-20 12:04:45 +05:30
Rajendra Nayak 55286a2938 OPP: Fix handling of multiple power domains
We seem to rely on the number of phandles specified in the
'required-opps' property to identify cases where a device is
associated with multiple power domains and hence would have
multiple virtual devices that have to be dealt with.

In cases where we do have devices with multiple power domains
but with only one of them being scalable, this logic seems to
fail.

Instead read the number of power domains from DT to identify
such cases.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-03-11 11:17:26 +01:00
Linus Torvalds ef8006846a Power management updates for 5.1-rc1
- Update the PM-runtime framework to use ktime instead of
    jiffies for accounting (Thara Gopinath, Vincent Guittot).
 
  - Optimize the autosuspend code in the PM-runtime framework
    somewhat (Ladislav Michl).
 
  - Add a PM core flag to mark devices that don't need any form of
    power management (Sudeep Holla).
 
  - Introduce driver API documentation for cpuidle and add a new
    cpuidle governor for tickless systems (Rafael Wysocki).
 
  - Add Jacobsville support to the intel_idle driver (Zhang Rui).
 
  - Clean up a cpuidle core header file and the cpuidle-dt and ACPI
    processor-idle drivers (Yangtao Li, Joseph Lo, Yazen Ghannam).
 
  - Add new cpufreq driver for Armada 8K (Gregory Clement).
 
  - Fix and clean up cpufreq core (Rafael Wysocki, Viresh Kumar,
    Amit Kucheria).
 
  - Add support for light-weight tear-down and bring-up of CPUs to the
    cpufreq core and use it in the cpufreq-dt driver (Viresh Kumar).
 
  - Fix cpu_cooling Kconfig dependencies, add support for CPU cooling
    auto-registration to the cpufreq core and use it in multiple
    cpufreq drivers (Amit Kucheria).
 
  - Fix some minor issues and do some cleanups in the davinci,
    e_powersaver, ap806, s5pv210, qcom and kryo cpufreq drivers
    (Bartosz Golaszewski, Gustavo Silva, Julia Lawall, Paweł Chmiel,
    Taniya Das, Viresh Kumar).
 
  - Add a Hisilicon CPPC quirk to the cppc_cpufreq driver (Xiongfeng
    Wang).
 
  - Clean up the intel_pstate and acpi-cpufreq drivers (Erwan Velu,
    Rafael Wysocki).
 
  - Clean up multiple cpufreq drivers (Yangtao Li).
 
  - Update cpufreq-related MAINTAINERS entries (Baruch Siach, Lukas
    Bulwahn).
 
  - Add support for exposing the Energy Model via debugfs and make
    multiple cpufreq drivers register an Energy Model to support
    energy-aware scheduling (Quentin Perret, Dietmar Eggemann,
    Matthias Kaehlcke).
 
  - Add Ice Lake mobile and Jacobsville support to the Intel RAPL
    power-capping driver (Gayatri Kammela, Zhang Rui).
 
  - Add a power estimation helper to the operating performance points
    (OPP) framework and clean up a core function in it (Quentin Perret,
    Viresh Kumar).
 
  - Make minor improvements in the generic power domains (genpd), OPP
    and system suspend frameworks and in the PM core (Aditya Pakki,
    Douglas Anderson, Greg Kroah-Hartman, Rafael Wysocki, Yangtao Li).
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Merge tag 'pm-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "These are PM-runtime framework changes to use ktime instead of jiffies
  for accounting, new PM core flag to mark devices that don't need any
  form of power management, cpuidle updates including driver API
  documentation and a new governor, cpufreq updates including a new
  driver for Armada 8K, thermal cleanups and more, some energy-aware
  scheduling (EAS) enabling changes, new chips support in the intel_idle
  and RAPL drivers and assorted cleanups in some other places.

  Specifics:

   - Update the PM-runtime framework to use ktime instead of jiffies for
     accounting (Thara Gopinath, Vincent Guittot)

   - Optimize the autosuspend code in the PM-runtime framework somewhat
     (Ladislav Michl)

   - Add a PM core flag to mark devices that don't need any form of
     power management (Sudeep Holla)

   - Introduce driver API documentation for cpuidle and add a new
     cpuidle governor for tickless systems (Rafael Wysocki)

   - Add Jacobsville support to the intel_idle driver (Zhang Rui)

   - Clean up a cpuidle core header file and the cpuidle-dt and ACPI
     processor-idle drivers (Yangtao Li, Joseph Lo, Yazen Ghannam)

   - Add new cpufreq driver for Armada 8K (Gregory Clement)

   - Fix and clean up cpufreq core (Rafael Wysocki, Viresh Kumar, Amit
     Kucheria)

   - Add support for light-weight tear-down and bring-up of CPUs to the
     cpufreq core and use it in the cpufreq-dt driver (Viresh Kumar)

   - Fix cpu_cooling Kconfig dependencies, add support for CPU cooling
     auto-registration to the cpufreq core and use it in multiple
     cpufreq drivers (Amit Kucheria)

   - Fix some minor issues and do some cleanups in the davinci,
     e_powersaver, ap806, s5pv210, qcom and kryo cpufreq drivers
     (Bartosz Golaszewski, Gustavo Silva, Julia Lawall, Paweł Chmiel,
     Taniya Das, Viresh Kumar)

   - Add a Hisilicon CPPC quirk to the cppc_cpufreq driver (Xiongfeng
     Wang)

   - Clean up the intel_pstate and acpi-cpufreq drivers (Erwan Velu,
     Rafael Wysocki)

   - Clean up multiple cpufreq drivers (Yangtao Li)

   - Update cpufreq-related MAINTAINERS entries (Baruch Siach, Lukas
     Bulwahn)

   - Add support for exposing the Energy Model via debugfs and make
     multiple cpufreq drivers register an Energy Model to support
     energy-aware scheduling (Quentin Perret, Dietmar Eggemann, Matthias
     Kaehlcke)

   - Add Ice Lake mobile and Jacobsville support to the Intel RAPL
     power-capping driver (Gayatri Kammela, Zhang Rui)

   - Add a power estimation helper to the operating performance points
     (OPP) framework and clean up a core function in it (Quentin Perret,
     Viresh Kumar)

   - Make minor improvements in the generic power domains (genpd), OPP
     and system suspend frameworks and in the PM core (Aditya Pakki,
     Douglas Anderson, Greg Kroah-Hartman, Rafael Wysocki, Yangtao Li)"

* tag 'pm-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (80 commits)
  cpufreq: kryo: Release OPP tables on module removal
  cpufreq: ap806: add missing of_node_put after of_device_is_available
  cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies
  cpufreq: Pass updated policy to driver ->setpolicy() callback
  cpufreq: Fix two debug messages in cpufreq_set_policy()
  cpufreq: Reorder and simplify cpufreq_update_policy()
  cpufreq: Add kerneldoc comments for two core functions
  PM / core: Add support to skip power management in device/driver model
  cpufreq: intel_pstate: Rework iowait boosting to be less aggressive
  cpufreq: intel_pstate: Eliminate intel_pstate_get_base_pstate()
  cpufreq: intel_pstate: Avoid redundant initialization of local vars
  powercap/intel_rapl: add Ice Lake mobile
  ACPI / processor: Set P_LVL{2,3} idle state descriptions
  cpufreq / cppc: Work around for Hisilicon CPPC cpufreq
  ACPI / CPPC: Add a helper to get desired performance
  cpufreq: davinci: move configuration to include/linux/platform_data
  cpufreq: speedstep: convert BUG() to BUG_ON()
  cpufreq: powernv: fix missing check of return value in init_powernv_pstates()
  cpufreq: longhaul: remove unneeded semicolon
  cpufreq: pcc-cpufreq: remove unneeded semicolon
  ..
2019-03-06 12:59:46 -08:00
Quentin Perret a4f342b960 PM / OPP: Introduce a power estimation helper
The Energy Model (EM) framework provides an API to let drivers register
the active power of CPUs. The drivers are expected to provide a callback
method which estimates the power consumed by a CPU at each available
performance levels. How exactly this should be implemented, however,
depends on the platform.

On some systems, PM_OPP knows the voltage and frequency at which CPUs
can run. When coupled with the CPU 'capacitance' (as provided by the
'dynamic-power-coefficient' devicetree binding), it is possible to
estimate the dynamic power consumption of a CPU as P = C * V^2 * f, with
C its capacitance and V and f respectively the voltage and frequency of
the OPP. The Intelligent Power Allocator (IPA) thermal governor already
implements that estimation method, in the thermal framework.

However, this power estimation method can be applied to any platform
where all the parameters are known (C, V and f), and not only those
suffering thermal issues. As such, the code implementing this feature
can be re-used to also populate the EM framework now used by EAS.

As a first step, introduce in PM_OPP a helper function which CPUFreq
drivers can use to register into the EM framework. This duplicates the
power estimation done in IPA until it can be migrated to using the EM
framework. This will be done later, once the EM framework has support
for at least all platforms currently supported by IPA.

Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2019-02-07 09:55:11 +05:30
Rajendra Nayak 5b93ac5423 OPP: Add support for parsing the 'opp-level' property
Now that the OPP bindings are updated to include an optional
'opp-level' property, add support to parse it from device tree
and store it as part of dev_pm_opp structure.
Also add and export an helper 'dev_pm_opp_get_level()' that can be
used to get the level value read from device tree when present.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
2019-01-22 15:06:11 -06:00
Viresh Kumar ade0c9493e Merge branch 'opp/genpd/propagation' into opp/linux-next 2018-12-14 16:28:52 +05:30