linux-stable.git/drivers/cpufreq, branch v5.3.8

cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown

2019-10-29T08:22:45+00:00

commit 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 upstream.

It is incorrect to set the cpufreq syscore shutdown callback pointer
to cpufreq_suspend(), because that function cannot be run in the
syscore stage of system shutdown for two reasons: (a) it may attempt
to carry out actions depending on devices that have already been shut
down at that point and (b) the RCU synchronization carried out by it
may not be able to make progress then.

The latter issue has been present since commit 45975c7d21a1 ("rcu:
Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds"),
but the former one has been there since commit 90de2a4aa9f3 ("cpufreq:
suspend cpufreq governors on shutdown") regardless.

Fix that by dropping cpufreq_syscore_ops altogether and making
device_shutdown() call cpufreq_suspend() directly before shutting
down devices, which is along the lines of what system-wide power
management does.

Fixes: 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")
Fixes: 90de2a4aa9f3 ("cpufreq: suspend cpufreq governors on shutdown")
Reported-by: Ville Syrjälä 
Tested-by: Ville Syrjälä 
Signed-off-by: Rafael J. Wysocki 
Acked-by: Viresh Kumar 
Cc: 4.0+  # 4.0+
Signed-off-by: Greg Kroah-Hartman

cpufreq: imx-cpufreq-dt: Add i.MX8MN support

2019-10-05T13:11:50+00:00

[ Upstream commit 75c000c4bcbe2b0eb82baf90c7dd75c7380cc3fd ]

i.MX8MN has different speed grading definition as below, it has 4 bits
to define speed grading, add support for it.

 SPEED_GRADE[3:0]    MHz
    0000            2300
    0001            2200
    0010            2100
    0011            2000
    0100            1900
    0101            1800
    0110            1700
    0111            1600
    1000            1500
    1001            1400
    1010            1300
    1011            1200
    1100            1100
    1101            1000
    1110             900
    1111             800

Signed-off-by: Anson Huang 
Reviewed-by: Leonard Crestez 
Signed-off-by: Viresh Kumar 
Signed-off-by: Sasha Levin

cpufreq: ap806: Add NULL check after kcalloc

2019-10-05T13:11:24+00:00

[ Upstream commit 3355c91b79394593ebbb197c8e930a91826f4ff3 ]

Add NULL check  after kcalloc.

Fix below issue reported by coccicheck
./drivers/cpufreq/armada-8k-cpufreq.c:138:1-12: alloc with no test,
possible model on line 151

Signed-off-by: Hariprasad Kelam 
Signed-off-by: Viresh Kumar 
Signed-off-by: Sasha Levin

cpufreq: dev_pm_qos_update_request() can return 1 on success

2019-08-10T11:39:47+00:00

dev_pm_qos_update_request() can return 1 on success, so don't treat
it as an error.

Fixes: 18c49926c4bf ("cpufreq: Add QoS requests for userspace constraints")
Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init()

2019-07-23T07:49:10+00:00

The cpu variable is still being used in the of_get_property() call
after the of_node_put() call, which may result in use-after-free.

Fixes: a9acc26b75f6 ("cpufreq/pasemi: fix possible object reference leak")
Signed-off-by: Wen Yang 
Acked-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

Merge branch 'pm-cpufreq'

2019-07-18T07:49:30+00:00

* pm-cpufreq:
  cpufreq: Make cpufreq_generic_init() return void
  cpufreq: imx-cpufreq-dt: Add i.MX8MN support
  cpufreq: Add QoS requests for userspace constraints
  cpufreq: intel_pstate: Reuse refresh_frequency_limits()
  cpufreq: Register notifiers with the PM QoS framework
  PM / QoS: Add support for MIN/MAX frequency constraints
  PM / QOS: Pass request type to dev_pm_qos_read_value()
  PM / QOS: Rename __dev_pm_qos_read_value() and dev_pm_qos_raw_read_value()
  PM / QOS: Pass request type to dev_pm_qos_{add|remove}_notifier()

cpufreq: Make cpufreq_generic_init() return void

2019-07-16T08:20:11+00:00

It always returns 0 (success) and its return type should really be void.

Over that, many drivers have added error handling code based on its
return value, which is not required at all.

Change its return type to void and update all the callers.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: imx-cpufreq-dt: Add i.MX8MN support

2019-07-08T21:58:01+00:00

i.MX8MN is a new SoC of i.MX8M series, it also uses speed
grading and market segment fuses for OPP definitions, add
support for this SoC.

Signed-off-by: Anson Huang 
Acked-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Add QoS requests for userspace constraints

2019-07-08T21:56:39+00:00

This implements QoS requests to manage userspace configuration of min
and max frequency.

Reviewed-by: Matthias Kaehlcke 
Reviewed-by: Ulf Hansson 
Signed-off-by: Viresh Kumar 
Tested-by: syzbot 
Signed-off-by: Rafael J. Wysocki

cpufreq: intel_pstate: Reuse refresh_frequency_limits()

2019-07-08T21:56:39+00:00

The implementation of intel_pstate_update_max_freq() is quite similar to
refresh_frequency_limits(), lets reuse it.

Finding minimum of policy->user_policy.max and policy->cpuinfo.max_freq
in intel_pstate_update_max_freq() is redundant as cpufreq_set_policy()
will call the ->verify() callback of intel-pstate driver, which will do
this comparison anyway and so dropping it from
intel_pstate_update_max_freq() doesn't harm.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki