Re: [PATCH 1/3] PM / Domains: Initial PM clock support for genpd
On 19 November 2014 18:25, Dmitry Torokhov dmitry.torok...@gmail.com wrote:
On Wed, Nov 19, 2014 at 03:00:36PM +0100, Ulf Hansson wrote:
It's quite common for PM domains to use PM clocks. Typically from SOC
specific code, the per device PM clock list is created and
pm_clk_suspend|resume() are invoked to handle clock gating/ungating.
A step towards consolidation is to integrate PM clock support into
genpd, which is what this patch does.
In this initial step, the calls to the pm_clk_suspend|resume() are
handled within genpd, but the per device PM clock list still needs to
be created from SOC specific code. It seems reasonable to have gendp to
handle that as well, but that left to future patches to address.
It's not every users of genpd that are keen on using PM clocks thus we
need to provide this a configuration option for genpd. Therefore let's
add flag field in the genpd struct to keep this information and define
a new PM_DOMAIN_PM_CLK bit can then be set at initialization.
Signed-off-by: Ulf Hansson ulf.hans...@linaro.org
---
drivers/base/power/domain.c | 7 +++
include/linux/pm_domain.h | 3 +++
2 files changed, 10 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3989eb6..42e328c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -12,6 +12,7 @@
#include linux/pm_runtime.h
#include linux/pm_domain.h
#include linux/pm_qos.h
+#include linux/pm_clock.h
#include linux/slab.h
#include linux/err.h
#include linux/sched.h
@@ -1948,6 +1949,12 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd-domain.ops.complete = pm_genpd_complete;
genpd-dev_ops.save_state = pm_genpd_default_save_state;
genpd-dev_ops.restore_state = pm_genpd_default_restore_state;
+
+ if (genpd-flags PM_DOMAIN_PM_CLK) {
+ genpd-dev_ops.stop = pm_clk_suspend;
+ genpd-dev_ops.start = pm_clk_suspend;
The 2nd one is wrong.
Huh, thanks for spotting this.
+ }
+
mutex_lock(gpd_list_lock);
list_add(genpd-gpd_list_node, gpd_list);
mutex_unlock(gpd_list_lock);
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 9d254e2..44c6931 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -14,6 +14,7 @@
#include linux/pm.h
#include linux/err.h
#include linux/of.h
+#include linux/bitops.h
#include linux/notifier.h
#include linux/cpuidle.h
@@ -76,6 +77,8 @@ struct generic_pm_domain {
struct device *dev);
void (*detach_dev)(struct generic_pm_domain *domain,
struct device *dev);
+ unsigned int flags; /* Bit field of configs for genpd */
+#define PM_DOMAIN_PM_CLK BIT(0) /* PM domain use PM clk */
s/use/uses ?
Are you planning on adding a separate flag for collecting clocks from OF
on attach/detach?
Yes, I am thinking on that approach. Do you have any suggestions around this?
Kind regards
Uffe
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Re: [PATCH 1/3] PM / Domains: Initial PM clock support for genpd
On Wed, Nov 19, 2014 at 03:00:36PM +0100, Ulf Hansson wrote:
It's quite common for PM domains to use PM clocks. Typically from SOC
specific code, the per device PM clock list is created and
pm_clk_suspend|resume() are invoked to handle clock gating/ungating.
A step towards consolidation is to integrate PM clock support into
genpd, which is what this patch does.
In this initial step, the calls to the pm_clk_suspend|resume() are
handled within genpd, but the per device PM clock list still needs to
be created from SOC specific code. It seems reasonable to have gendp to
handle that as well, but that left to future patches to address.
It's not every users of genpd that are keen on using PM clocks thus we
need to provide this a configuration option for genpd. Therefore let's
add flag field in the genpd struct to keep this information and define
a new PM_DOMAIN_PM_CLK bit can then be set at initialization.
Signed-off-by: Ulf Hansson ulf.hans...@linaro.org
---
drivers/base/power/domain.c | 7 +++
include/linux/pm_domain.h | 3 +++
2 files changed, 10 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3989eb6..42e328c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -12,6 +12,7 @@
#include linux/pm_runtime.h
#include linux/pm_domain.h
#include linux/pm_qos.h
+#include linux/pm_clock.h
#include linux/slab.h
#include linux/err.h
#include linux/sched.h
@@ -1948,6 +1949,12 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd-domain.ops.complete = pm_genpd_complete;
genpd-dev_ops.save_state = pm_genpd_default_save_state;
genpd-dev_ops.restore_state = pm_genpd_default_restore_state;
+
+ if (genpd-flags PM_DOMAIN_PM_CLK) {
+ genpd-dev_ops.stop = pm_clk_suspend;
+ genpd-dev_ops.start = pm_clk_suspend;
The 2nd one is wrong.
+ }
+
mutex_lock(gpd_list_lock);
list_add(genpd-gpd_list_node, gpd_list);
mutex_unlock(gpd_list_lock);
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 9d254e2..44c6931 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -14,6 +14,7 @@
#include linux/pm.h
#include linux/err.h
#include linux/of.h
+#include linux/bitops.h
#include linux/notifier.h
#include linux/cpuidle.h
@@ -76,6 +77,8 @@ struct generic_pm_domain {
struct device *dev);
void (*detach_dev)(struct generic_pm_domain *domain,
struct device *dev);
+ unsigned int flags; /* Bit field of configs for genpd */
+#define PM_DOMAIN_PM_CLK BIT(0) /* PM domain use PM clk */
s/use/uses ?
Are you planning on adding a separate flag for collecting clocks from OF
on attach/detach?
};
static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
--
1.9.1
Thanks.
--
Dmitry
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