linux-stable.git/drivers/cpufreq, branch v5.8.2

cpufreq: dt: fix oops on armada37xx

2020-08-19T06:27:05+00:00

commit 10470dec3decaf5ed3c596f85debd7c42777ae12 upstream.

Commit 0c868627e617e43a295d8 (cpufreq: dt: Allow platform specific
intermediate callbacks) added two function pointers to the
struct cpufreq_dt_platform_data. However, armada37xx_cpufreq_driver_init()
has this struct (pdata) located on the stack and uses only "suspend"
and "resume" fields. So these newly added "get_intermediate" and
"target_intermediate" pointers are uninitialized and contain arbitrary
non-null values, causing all kinds of trouble.

For instance, here is an oops on espressobin after an attempt to change
the cpefreq governor:

[   29.174554] Unable to handle kernel execute from non-executable memory at virtual address ffff00003f87bdc0
...
[   29.269373] pc : 0xffff00003f87bdc0
[   29.272957] lr : __cpufreq_driver_target+0x138/0x580
...

Fixed by zeroing out pdata before use.

Cc:  # v5.7+
Signed-off-by: Ivan Kokshaysky 
Reviewed-by: Andrew Lunn 
Signed-off-by: Viresh Kumar 
Signed-off-by: Greg Kroah-Hartman

cpufreq: Fix locking issues with governors

2020-08-19T06:27:05+00:00

commit 8cc46ae565c393f77417cb9530b1265eb50f5d2e upstream.

The locking around governors handling isn't adequate currently.

The list of governors should never be traversed without the locking
in place. Also governor modules must not be removed while the code
in them is still in use.

Reported-by: Quentin Perret 
Signed-off-by: Viresh Kumar 
Cc: All applicable 
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Greg Kroah-Hartman

cpufreq: ap806: fix cpufreq driver needs ap cpu clk

2020-08-19T06:26:49+00:00

[ Upstream commit 8c37ad2f523396e15cf002b29f8f796447c71932 ]

The Armada 8K cpufreq driver needs the Armada AP CPU CLK
to work. This dependency is currently not satisfied and
the ARMADA_AP_CPU_CLK can not be selected independently.

Add it to the cpufreq Armada8k driver.

Fixes: f525a670533d ("cpufreq: ap806: add cpufreq driver for Armada 8K")
Signed-off-by: Sven Auhagen 
Signed-off-by: Viresh Kumar 
Signed-off-by: Sasha Levin

cpufreq: intel_pstate: Fix active mode setting from command line

2020-07-13T15:55:57+00:00

If intel_pstate starts in the passive mode by default (that happens
when the processor in the system doesn't support HWP), passing
intel_pstate=active in the kernel command line doesn't work, so
fix that.

Fixes: 33aa46f252c7 ("cpufreq: intel_pstate: Use passive mode by default without HWP")
Reported-by: Doug Smythies 
Signed-off-by: Rafael J. Wysocki 
Acked-by: Doug Smythies

cpufreq: intel_pstate: Add one more OOB control bit

2020-06-23T15:24:32+00:00

Add one more bit for OOB (Out Of Band) enabling of P-states.

If OOB handling of P-states is enabled, intel_pstate shouldn't load.
Currently, only "BIT(8) == 1" of the MSR MSR_MISC_PWR_MGMT is
considered as OOB, but "BIT(18) == 1" needs to be taken into
consideration as OOB condition too.

Signed-off-by: Srinivas Pandruvada 
[ rjw: Add an empty code line, edit subject and changelog ]
Signed-off-by: Rafael J. Wysocki

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-13T16:57:21+00:00

Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over
'---help---'"), the number of '---help---' has been gradually
decreasing, but there are still more than 2400 instances.

This commit finishes the conversion. While I touched the lines,
I also fixed the indentation.

There are a variety of indentation styles found.

  a) 4 spaces + '---help---'
  b) 7 spaces + '---help---'
  c) 8 spaces + '---help---'
  d) 1 space + 1 tab + '---help---'
  e) 1 tab + '---help---'    (correct indentation)
  f) 1 tab + 1 space + '---help---'
  g) 1 tab + 2 spaces + '---help---'

In order to convert all of them to 1 tab + 'help', I ran the
following commend:

  $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/'

Signed-off-by: Masahiro Yamada

Merge tag 'pm-5.8-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2020-06-10T21:04:39+00:00

Pull more power management updates from Rafael Wysocki:
 "These are operating performance points (OPP) framework updates mostly,
  including support for interconnect bandwidth in the OPP core, plus a
  few cpufreq changes, including boost support in the CPPC cpufreq
  driver, an ACPI device power management fix and a hibernation code
  cleanup.

  Specifics:

   - Add support for interconnect bandwidth to the OPP core (Georgi
     Djakov, Saravana Kannan, Sibi Sankar, Viresh Kumar).

   - Add support for regulator enable/disable to the OPP core (Kamil
     Konieczny).

   - Add boost support to the CPPC cpufreq driver (Xiongfeng Wang).

   - Make the tegra186 cpufreq driver set the
     CPUFREQ_NEED_INITIAL_FREQ_CHECK flag (Mian Yousaf Kaukab).

   - Prevent the ACPI power management from using power resources with
     devices where the list of power resources for power state D0 (full
     power) is missing (Rafael Wysocki).

   - Annotate a hibernation-related function with __init (Christophe
     JAILLET)"

* tag 'pm-5.8-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: PM: Avoid using power resources if there are none for D0
  cpufreq: CPPC: add SW BOOST support
  cpufreq: change '.set_boost' to act on one policy
  PM: hibernate: Add __init annotation to swsusp_header_init()
  opp: Don't parse icc paths unnecessarily
  opp: Remove bandwidth votes when target_freq is zero
  opp: core: add regulators enable and disable
  opp: Reorder the code for !target_freq case
  opp: Expose bandwidth information via debugfs
  cpufreq: dt: Add support for interconnect bandwidth scaling
  opp: Update the bandwidth on OPP frequency changes
  opp: Add sanity checks in _read_opp_key()
  opp: Add support for parsing interconnect bandwidth
  cpufreq: tegra186: add CPUFREQ_NEED_INITIAL_FREQ_CHECK flag
  OPP: Add helpers for reading the binding properties
  dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings

Merge branches 'pm-cpufreq' and 'pm-acpi'

2020-06-10T15:10:40+00:00

* pm-cpufreq:
  cpufreq: CPPC: add SW BOOST support
  cpufreq: change '.set_boost' to act on one policy
  cpufreq: tegra186: add CPUFREQ_NEED_INITIAL_FREQ_CHECK flag

* pm-acpi:
  ACPI: PM: Avoid using power resources if there are none for D0

Merge branch 'pm-opp'

2020-06-10T15:10:30+00:00

* pm-opp:
  opp: Don't parse icc paths unnecessarily
  opp: Remove bandwidth votes when target_freq is zero
  opp: core: add regulators enable and disable
  opp: Reorder the code for !target_freq case
  opp: Expose bandwidth information via debugfs
  cpufreq: dt: Add support for interconnect bandwidth scaling
  opp: Update the bandwidth on OPP frequency changes
  opp: Add sanity checks in _read_opp_key()
  opp: Add support for parsing interconnect bandwidth
  interconnect: Remove unused module exit code from core
  interconnect: Disallow interconnect core to be built as a module
  interconnect: Add of_icc_get_by_index() helper function
  OPP: Add helpers for reading the binding properties
  dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings

cpufreq: CPPC: add SW BOOST support

2020-06-05T12:20:02+00:00

To add SW BOOST support for CPPC, we need to get the max frequency of
boost mode and non-boost mode. ACPI spec 6.2 section 8.4.7.1 describes
the following two CPC registers.

"Highest performance is the absolute maximum performance an individual
processor may reach, assuming ideal conditions. This performance level
may not be sustainable for long durations, and may only be achievable if
other platform components are in a specific state; for example, it may
require other processors be in an idle state.

Nominal Performance is the maximum sustained performance level of the
processor, assuming ideal operating conditions. In absence of an
external constraint (power, thermal, etc.) this is the performance level
the platform is expected to be able to maintain continuously. All
processors are expected to be able to sustain their nominal performance
state simultaneously."

To add SW BOOST support for CPPC, we can use Highest Performance as the
max performance in boost mode and Nominal Performance as the max
performance in non-boost mode. If the Highest Performance is greater
than the Nominal Performance, we assume SW BOOST is supported.

The current CPPC driver does not support SW BOOST and use 'Highest
Performance' as the max performance the CPU can achieve. 'Nominal
Performance' is used to convert 'performance' to 'frequency'. That
means, if firmware enable boost and provide a value for Highest
Performance which is greater than Nominal Performance, boost feature is
enabled by default.

Because SW BOOST is disabled by default, so, after this patch, boost
feature is disabled by default even if boost is enabled by firmware.

Signed-off-by: Xiongfeng Wang 
Suggested-by: Viresh Kumar 
Acked-by: Viresh Kumar 
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki