cpufreq: brcmstb-avs-cpufreq: properly retrieve P-state upon suspend

The AVS GET_PMAP command does return a P-state along with the P-map
information. However, that P-state is the initial P-state when the
P-map was first downloaded to AVS. It is *not* the current P-state.

Therefore, we explicitly retrieve the P-state using the GET_PSTATE
command.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/brcmstb-avs-cpufreq.c b/drivers/cpufreq/brcmstb-avs-cpufreq.c
index 2c6e325..c943606 100644 (file)
--- a/drivers/cpufreq/brcmstb-avs-cpufreq.c
+++ b/drivers/cpufreq/brcmstb-avs-cpufreq.c
@@ -784,8 +784,19 @@ static int brcm_avs_target_index(struct cpufreq_policy *policy,
 static int brcm_avs_suspend(struct cpufreq_policy *policy)
 {
        struct private_data *priv = policy->driver_data;
+       int ret;
+
+       ret = brcm_avs_get_pmap(priv, &priv->pmap);
+       if (ret)
+               return ret;
 
-       return brcm_avs_get_pmap(priv, &priv->pmap);
+       /*
+        * We can't use the P-state returned by brcm_avs_get_pmap(), since
+        * that's the initial P-state from when the P-map was downloaded to the
+        * AVS co-processor, not necessarily the P-state we are running at now.
+        * So, we get the current P-state explicitly.
+        */
+       return brcm_avs_get_pstate(priv, &priv->pmap.state);
 }
 
 static int brcm_avs_resume(struct cpufreq_policy *policy)