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authorLeonard Crestez <leonard.crestez@nxp.com>2017-04-04 20:04:12 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-04-19 23:22:01 +0200
commit5aa1599ff039a68a5c43e9aa74973f40b1065746 (patch)
treef22f034b46d8657aea8dafae29b4734f9b09f831
parent54cad2fce71f3ed2995bfc6d17d4ea5c898f20b1 (diff)
downloadleg-kernel-5aa1599ff039a68a5c43e9aa74973f40b1065746.tar.gz
cpufreq: imx6q: Set max suspend_freq to avoid changes during suspend
If the cpufreq driver tries to modify voltage/freq during suspend/resume it might need to control an external PMIC via I2C or SPI but those devices might be already suspended. This issue is likely to happen whenever the LDOs have their vin-supply set. To avoid this scenario we just increase cpufreq to the maximum before suspend. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/cpufreq/imx6q-cpufreq.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index be90ee3810bf..786122e0455e 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -161,8 +161,13 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
{
+ int ret;
+
policy->clk = arm_clk;
- return cpufreq_generic_init(policy, freq_table, transition_latency);
+ ret = cpufreq_generic_init(policy, freq_table, transition_latency);
+ policy->suspend_freq = policy->max;
+
+ return ret;
}
static struct cpufreq_driver imx6q_cpufreq_driver = {
@@ -173,6 +178,7 @@ static struct cpufreq_driver imx6q_cpufreq_driver = {
.init = imx6q_cpufreq_init,
.name = "imx6q-cpufreq",
.attr = cpufreq_generic_attr,
+ .suspend = cpufreq_generic_suspend,
};
static int imx6q_cpufreq_probe(struct platform_device *pdev)