redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

PM / OPP: Parse clock-latency and voltage-tolerance for v1 bindings 

V2 bindings have better support for clock-latency and voltage-tolerance
and doesn't need special care. To use callbacks, like
dev_pm_opp_get_max_{transition|volt}_latency(), irrespective of the
bindings, the core needs to know clock-latency/voltage-tolerance for the
earlier bindings.

This patch reads clock-latency/voltage-tolerance from the device node,
irrespective of the bindings (to keep it simple) and use them only for
V1 bindings.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Viresh Kumar 2016-02-09 10:30:37 +05:30 committed by Rafael J. Wysocki
parent 2174344765
commit 50f8cfbd58
2 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/base/power/opp/core.c
View File

@ -582,6 +582,7 @@ static struct device_opp *_add_device_opp(struct device *dev)
{
struct device_opp *dev_opp;
struct device_list_opp *list_dev;
struct device_node *np;
/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
@ -604,6 +605,21 @@ static struct device_opp *_add_device_opp(struct device *dev)
return NULL;
}
/*
* Only required for backward compatibility with v1 bindings, but isn't
* harmful for other cases. And so we do it unconditionally.
*/
np = of_node_get(dev->of_node);
if (np) {
u32 val;
if (!of_property_read_u32(np, "clock-latency", &val))
dev_opp->clock_latency_ns_max = val;
of_property_read_u32(np, "voltage-tolerance",
&dev_opp->voltage_tolerance_v1);
of_node_put(np);
}
srcu_init_notifier_head(&dev_opp->srcu_head);
INIT_LIST_HEAD(&dev_opp->opp_list);
@ -861,6 +877,7 @@ static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
{
struct device_opp *dev_opp;
struct dev_pm_opp *new_opp;
unsigned long tol;
int ret;
/* Hold our list modification lock here */
@ -874,7 +891,10 @@ static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
/* populate the opp table */
new_opp->rate = freq;
tol = u_volt * dev_opp->voltage_tolerance_v1 / 100;
new_opp->u_volt = u_volt;
new_opp->u_volt_min = u_volt - tol;
new_opp->u_volt_max = u_volt + tol;
new_opp->available = true;
new_opp->dynamic = dynamic;

6
drivers/base/power/opp/opp.h
View File

@ -138,6 +138,8 @@ struct device_list_opp {
* @dentry: debugfs dentry pointer of the real device directory (not links).
* @dentry_name: Name of the real dentry.
*
* @voltage_tolerance_v1: In percentage, for v1 bindings only.
*
* This is an internal data structure maintaining the link to opps attached to
* a device. This structure is not meant to be shared to users as it is
* meant for book keeping and private to OPP library.
@ -156,6 +158,10 @@ struct device_opp {
struct device_node *np;
unsigned long clock_latency_ns_max;
/* For backward compatibility with v1 bindings */
unsigned int voltage_tolerance_v1;
bool shared_opp;
struct dev_pm_opp *suspend_opp;