| Message ID | 5f61b819733127ddc7d41e82bf703a355c845b49.1491324640.git.leonard.crestez@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Am Dienstag, den 04.04.2017, 20:04 +0300 schrieb Leonard Crestez: > 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> > --- > drivers/cpufreq/imx6q-cpufreq.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c > index be90ee3..786122e 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)
On 04-04-17, 20:04, Leonard Crestez wrote: > 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> > --- > drivers/cpufreq/imx6q-cpufreq.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) I have already Acked this earlier, why didn't you add it ?
On Tue, 2017-04-11 at 12:07 +0530, Viresh Kumar wrote: > On 04-04-17, 20:04, Leonard Crestez wrote: > > 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> > > --- > > drivers/cpufreq/imx6q-cpufreq.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > I have already Acked this earlier, why didn't you add it ? Because v2 is different based on comments from Lucas. It didn't seem appropriate to keep an old "Acked-by" in this case.
On 04-04-17, 20:04, Leonard Crestez wrote: > 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> > --- > drivers/cpufreq/imx6q-cpufreq.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c > index be90ee3..786122e 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) Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c index be90ee3..786122e 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)
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> --- drivers/cpufreq/imx6q-cpufreq.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)