linux-toradex.git/drivers/clocksource/em_sti.c, branch v4.20

clocksource/drivers/em_sti: Fix error return codes in em_sti_probe()

2017-08-10T12:48:18+00:00

Propagate the return values of platform_get_irq and devm_request_irq on
failure.

Cc: Frans Klaver 
Signed-off-by: Gustavo A. R. Silva 
Signed-off-by: Daniel Lezcano

clocksource: em_sti: Compute rate before registration

2017-03-23T19:14:03+00:00

With the upcoming NTP correction related rate adjustments to be implemented
in the clockevents core, the latter needs to get informed about every rate
change of a clockevent device made after its registration.

Currently, em_sti violates this requirement in that it registers its
clockevent device with a dummy rate and sets its final rate through
clockevents_config() called from its ->set_state_oneshot().

This patch moves the setting of the clockevent device's rate to its
registration.

I checked all current em_sti users in arch/arm/mach-shmobile and right now,
none of them changes any rate in any clock tree relevant to em_sti after
their respective time_init(). Since all em_sti instances are created after
time_init(), none of them should ever observe any clock rate changes.

- Determine the ->rate value in em_sti_probe() at device probing rather
  than at first usage.
- Set the clockevent device's rate at its registration.
- Although not strictly necessary for the upcoming clockevent core changes,
  set the clocksource's rate at its registration for consistency.

Signed-off-by: Nicolai Stange 
Signed-off-by: John Stultz

clocksource: em_sti: Split clock prepare and enable steps

2017-03-23T19:14:02+00:00

Currently, the em_sti driver prepares and enables the needed clock in
em_sti_enable(), potentially called through its clockevent device's
->set_state_oneshot().

However, the clk_prepare() step may sleep whereas tick_program_event() and
thus, ->set_state_oneshot(), can be called in atomic context.

Split the clk_prepare_enable() in em_sti_enable() into two steps:
- prepare the clock at device probing via clk_prepare()
- and enable it in em_sti_enable() via clk_enable().
Slightly reorder resource initialization in em_sti_probe() in order to
facilitate error handling in later patches.

Signed-off-by: Nicolai Stange 
Signed-off-by: John Stultz

clocksource: Use a plain u64 instead of cycle_t

2016-12-25T10:04:12+00:00

There is no point in having an extra type for extra confusion. u64 is
unambiguous.

Conversion was done with the following coccinelle script:

@rem@
@@
-typedef u64 cycle_t;

@fix@
typedef cycle_t;
@@
-cycle_t
+u64

Signed-off-by: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: John Stultz

clocksource/drivers/em_sti: Remove unneeded memset()s

2015-10-15T15:41:59+00:00

Memory for cs and ced fields in struct em_sti_priv is allocated
by devm_kzalloc() in the beginning of em_sti_probe() so they
don't need to be zeroed one more time in
em_sti_register_clocksource() and in em_sti_register_clockevent().

Signed-off-by: Alexey Klimov 
Signed-off-by: Daniel Lezcano

clockevents/drivers/em_sti: Migrate to new 'set-state' interface

2015-08-06T10:16:42+00:00

Migrate em_sti driver to the new 'set-state' interface provided by
the clockevents core, the earlier 'set-mode' interface is marked
obsolete now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

NOTE: This also drops a special check:

	if (old_mode == CLOCK_EVT_MODE_ONESHOT)
		em_sti_stop(p, USER_CLOCKEVENT);

as it doesn't look like that important. This driver only supports
ONESHOT and we can only move only to SHUTDOWN from ONESHOT and.
Also on second call (on shutdown), em_sti_stop() would return without
disabling the device again.

Acked-by: Daniel Lezcano 
Cc: Magnus Damm 
Signed-off-by: Viresh Kumar 
Signed-off-by: Daniel Lezcano

clocksource: Rename __clocksource_updatefreq_() to __clocksource_update_freq_()

2015-03-13T07:07:08+00:00

Ingo requested this function be renamed to improve readability,
so I've renamed __clocksource_updatefreq_scale() as well as the
__clocksource_updatefreq_hz/khz() functions to avoid
squishedtogethernames.

This touches some of the sh clocksources, which I've not tested.

The arch/arm/plat-omap change is just a comment change for
consistency.

Signed-off-by: John Stultz 
Cc: Daniel Lezcano 
Cc: Dave Jones 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Prarit Bhargava 
Cc: Richard Cochran 
Cc: Stephen Boyd 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1426133800-29329-13-git-send-email-john.stultz@linaro.org
Signed-off-by: Ingo Molnar

clocksource: em_sti: Remove unnecessary OOM messages

2014-05-23T07:23:10+00:00

The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han 
Signed-off-by: Daniel Lezcano

clocksource: em_sti: convert to clk_prepare/unprepare

2013-10-22T20:36:24+00:00

Add calls to clk_prepare and unprepare so that EMMA Mobile EV2 can
migrate to the common clock framework.

Signed-off-by: Shinya Kuribayashi 
Acked-by: Daniel Lezcano 
Acked-by: Laurent Pinchart 
Acked-by: Magnus Damm 
Signed-off-by: Simon Horman 
Signed-off-by: Daniel Lezcano

clocksource: em_sti: Set cpu_possible_mask to fix SMP broadcast

2013-09-26T00:31:04+00:00

Update the STI driver by setting cpu_possible_mask to make EMEV2
SMP work as expected together with the ARM broadcast timer.

This breakage was introduced by:

f7db706 ARM: 7674/1: smp: Avoid dummy clockevent being preferred over real hardware clock-event

Without this fix SMP operation is broken on EMEV2 since no
broadcast timer interrupts trigger on the secondary CPU cores.

Signed-off-by: Magnus Damm 
Tested-by: Simon Horman 
Reviewed-by: Stephen Boyd 
Signed-off-by: Simon Horman 
Signed-off-by: Daniel Lezcano