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cpufreq: speedstep-smi: enable interrupts when waiting 

commit d4d4eda23794c701442e55129dd4f8f2fefd5e4d upstream.

On Dell Latitude C600 laptop with Pentium 3 850MHz processor, the
speedstep-smi driver sometimes loads and sometimes doesn't load with
"change to state X failed" message.

The hardware sometimes refuses to change frequency and in this case, we
need to retry later. I found out that we need to enable interrupts while
waiting. When we enable interrupts, the hardware blockage that prevents
frequency transition resolves and the transition is possible. With
disabled interrupts, the blockage doesn't resolve (no matter how long do
we wait). The exact reasons for this hardware behavior are unknown.

This patch enables interrupts in the function speedstep_set_state that can
be called with disabled interrupts. However, this function is called with
disabled interrupts only from speedstep_get_freqs, so it shouldn't cause
any problem.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2015-02-09 13:38:17 -05:00 committed by Greg Kroah-Hartman
parent c1b940de40
commit ea9bc74573
2 changed files with 15 additions and 0 deletions
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3
drivers/cpufreq/speedstep-lib.c
View File

@ -400,6 +400,7 @@ unsigned int speedstep_get_freqs(enum speedstep_processor processor,
pr_debug("previous speed is %u\n", prev_speed);
preempt_disable();
local_irq_save(flags);
/* switch to low state */
@ -464,6 +465,8 @@ unsigned int speedstep_get_freqs(enum speedstep_processor processor,
out:
local_irq_restore(flags);
preempt_enable();
return ret;
}
EXPORT_SYMBOL_GPL(speedstep_get_freqs);

12
drivers/cpufreq/speedstep-smi.c
View File

@ -188,6 +188,7 @@ static void speedstep_set_state(unsigned int state)
return;
/* Disable IRQs */
preempt_disable();
local_irq_save(flags);
command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
@ -198,9 +199,19 @@ static void speedstep_set_state(unsigned int state)
do {
if (retry) {
/*
* We need to enable interrupts, otherwise the blockage
* won't resolve.
*
* We disable preemption so that other processes don't
* run. If other processes were running, they could
* submit more DMA requests, making the blockage worse.
*/
pr_debug("retry %u, previous result %u, waiting...\n",
retry, result);
local_irq_enable();
mdelay(retry * 50);
local_irq_disable();
}
retry++;
__asm__ __volatile__(
@ -217,6 +228,7 @@ static void speedstep_set_state(unsigned int state)
/* enable IRQs */
local_irq_restore(flags);
preempt_enable();
if (new_state == state)
pr_debug("change to %u MHz succeeded after %u tries "