[PATCH 3.2 033/221] cpufreq: speedstep-smi: enable interrupts when waiting

From: Ben Hutchings
Date: Mon May 04 2015 - 21:47:36 EST


3.2.69-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Mikulas Patocka <mpatocka@xxxxxxxxxx>

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@xxxxxxxxxx
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/cpufreq/speedstep-lib.c | 3 +++
drivers/cpufreq/speedstep-smi.c | 12 ++++++++++++
2 files changed, 15 insertions(+)

--- a/drivers/cpufreq/speedstep-lib.c
+++ b/drivers/cpufreq/speedstep-lib.c
@@ -399,6 +399,7 @@ unsigned int speedstep_get_freqs(enum sp

pr_debug("previous speed is %u\n", prev_speed);

+ preempt_disable();
local_irq_save(flags);

/* switch to low state */
@@ -463,6 +464,8 @@ unsigned int speedstep_get_freqs(enum sp

out:
local_irq_restore(flags);
+ preempt_enable();
+
return ret;
}
EXPORT_SYMBOL_GPL(speedstep_get_freqs);
--- a/drivers/cpufreq/speedstep-smi.c
+++ b/drivers/cpufreq/speedstep-smi.c
@@ -187,6 +187,7 @@ static void speedstep_set_state(unsigned
return;

/* Disable IRQs */
+ preempt_disable();
local_irq_save(flags);

command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
@@ -197,9 +198,19 @@ static void speedstep_set_state(unsigned

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__(
@@ -216,6 +227,7 @@ static void speedstep_set_state(unsigned

/* enable IRQs */
local_irq_restore(flags);
+ preempt_enable();

if (new_state == state)
pr_debug("change to %u MHz succeeded after %u tries "

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