| Message ID | 1447799871-56374-8-git-send-email-lina.iyer@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 17 November 2015 at 23:37, Lina Iyer <lina.iyer@linaro.org> wrote: > Domains that have expensive suspend resume operations, may require a > certain amount of time be spent in an idle state to reap the power > saving benefit. Such domains, may provide the residency requirement for > a domain state. > > Read the residency for a domain state from the DT. A domain governor may > use this information in determining the state for the domain. > > Cc: Axel Haslam <ahaslam@baylibre.com> > Cc: Marc Titinger <mtitinger@baylibre.com> > Signed-off-by: Lina Iyer <lina.iyer@linaro.org> > --- > Documentation/devicetree/bindings/power/power_domain.txt | 7 +++++++ Please split DT documentation into a separate patch preceding $subject patch. Don't forget to send it to the DT maintainers as well. > drivers/base/power/domain.c | 6 ++++++ > include/linux/pm_domain.h | 1 + > 3 files changed, 14 insertions(+) > > diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt > index ecfaf44..d71da29 100644 > --- a/Documentation/devicetree/bindings/power/power_domain.txt > +++ b/Documentation/devicetree/bindings/power/power_domain.txt > @@ -67,6 +67,13 @@ have the following properties - > If omitted, this is assumed to be equal to: > entry-latency-us + exit-latency-us > > + - residency-us: > + Usage: Optional > + Value type: <prop-encoded-array> > + Definition: A u32 value representing the time for which a > + domain must be idle in the state to reap power saving benefits > + of entering the state. > + > - state-param: > Usage: Optional > Value type: <prop-encoded-array> > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index 9a0df09..abc81bd 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -1245,6 +1245,7 @@ static int genpd_alloc_states_data(struct generic_pm_domain *genpd, > st[i].power_on_latency_ns; > genpd->states[i].power_off_latency_ns = > st[i].power_off_latency_ns; > + genpd->states[i].residency_ns = st[i].residency_ns; > genpd->states[i].param = st[i].param; > } > > @@ -1513,6 +1514,7 @@ static int of_get_genpd_power_state(struct genpd_power_state *genpd_state, > const struct of_device_id *match_id; > int err = 0; > u32 latency; > + u32 residency; > u32 param; > > match_id = of_match_node(power_state_match, state_node); > @@ -1554,6 +1556,10 @@ static int of_get_genpd_power_state(struct genpd_power_state *genpd_state, > return -EINVAL; > } > > + err = of_property_read_u32(state_node, "residency-us", &residency); > + if (!err) > + genpd_state->residency_ns = 1000 * residency; > + > err = of_property_read_u32(state_node, "state-param", ¶m); > if (!err) > genpd_state->param = param; > diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h > index 108a4b3..fed024a 100644 > --- a/include/linux/pm_domain.h > +++ b/include/linux/pm_domain.h > @@ -41,6 +41,7 @@ struct genpd_power_state { > char *name; > s64 power_off_latency_ns; > s64 power_on_latency_ns; > + s64 residency_ns; > u32 param; > }; > > -- > 2.1.4 > A general comment. I would as step prior $subject patch, add the mechanism in genpd to deal with this new concept of residency values. When *all* that mechanism is in place (perhaps it needs more than one patch), then add the DT parts. Kind regards Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt index ecfaf44..d71da29 100644 --- a/Documentation/devicetree/bindings/power/power_domain.txt +++ b/Documentation/devicetree/bindings/power/power_domain.txt @@ -67,6 +67,13 @@ have the following properties - If omitted, this is assumed to be equal to: entry-latency-us + exit-latency-us + - residency-us: + Usage: Optional + Value type: <prop-encoded-array> + Definition: A u32 value representing the time for which a + domain must be idle in the state to reap power saving benefits + of entering the state. + - state-param: Usage: Optional Value type: <prop-encoded-array> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 9a0df09..abc81bd 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1245,6 +1245,7 @@ static int genpd_alloc_states_data(struct generic_pm_domain *genpd, st[i].power_on_latency_ns; genpd->states[i].power_off_latency_ns = st[i].power_off_latency_ns; + genpd->states[i].residency_ns = st[i].residency_ns; genpd->states[i].param = st[i].param; } @@ -1513,6 +1514,7 @@ static int of_get_genpd_power_state(struct genpd_power_state *genpd_state, const struct of_device_id *match_id; int err = 0; u32 latency; + u32 residency; u32 param; match_id = of_match_node(power_state_match, state_node); @@ -1554,6 +1556,10 @@ static int of_get_genpd_power_state(struct genpd_power_state *genpd_state, return -EINVAL; } + err = of_property_read_u32(state_node, "residency-us", &residency); + if (!err) + genpd_state->residency_ns = 1000 * residency; + err = of_property_read_u32(state_node, "state-param", ¶m); if (!err) genpd_state->param = param; diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 108a4b3..fed024a 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -41,6 +41,7 @@ struct genpd_power_state { char *name; s64 power_off_latency_ns; s64 power_on_latency_ns; + s64 residency_ns; u32 param; };
Domains that have expensive suspend resume operations, may require a certain amount of time be spent in an idle state to reap the power saving benefit. Such domains, may provide the residency requirement for a domain state. Read the residency for a domain state from the DT. A domain governor may use this information in determining the state for the domain. Cc: Axel Haslam <ahaslam@baylibre.com> Cc: Marc Titinger <mtitinger@baylibre.com> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> --- Documentation/devicetree/bindings/power/power_domain.txt | 7 +++++++ drivers/base/power/domain.c | 6 ++++++ include/linux/pm_domain.h | 1 + 3 files changed, 14 insertions(+) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html