ARM: shmobile: Set PM domain on/off latencies directly

The results of adaptive latency computations in __pm_genpd_poweron()
and pm_genpd_poweroff() show that the power on/power off latencies
of all power domains in SH7372 are a little below 250 us.  Therefore,
if 250 us is used as the common initial value of the latency fields
in struct generic_pm_domain for all domains, the latency values
will never have to change at run time and there won't be any overhead
related to re-computation of the corresponding PM QoS data.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index 0d722b5b5219..9d055a9f27c8 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -71,6 +71,8 @@
 
 #ifdef CONFIG_PM
 
+#define PM_DOMAIN_ON_OFF_LATENCY_NS     250000
+
 static int sh7372_a4r_pd_suspend(void)
 {
         sh7372_intcs_suspend();
@@ -110,32 +112,46 @@ static int sh7372_a3sp_pd_suspend(void)
 static struct rmobile_pm_domain sh7372_pm_domains[] = {
         {
                 .genpd.name = "A4LC",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 1,
         },
         {
                 .genpd.name = "A4MP",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 2,
         },
         {
                 .genpd.name = "D4",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 3,
         },
         {
                 .genpd.name = "A4R",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 5,
                 .suspend = sh7372_a4r_pd_suspend,
                 .resume = sh7372_intcs_resume,
         },
         {
                 .genpd.name = "A3RV",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 6,
         },
         {
                 .genpd.name = "A3RI",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 8,
         },
         {
                 .genpd.name = "A4S",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 10,
                 .gov = &pm_domain_always_on_gov,
                 .no_debug = true,
@@ -144,6 +160,8 @@ static struct rmobile_pm_domain sh7372_pm_domains[] = {
         },
         {
                 .genpd.name = "A3SP",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 11,
                 .gov = &pm_domain_always_on_gov,
                 .no_debug = true,
@@ -151,6 +169,8 @@ static struct rmobile_pm_domain sh7372_pm_domains[] = {
         },
         {
                 .genpd.name = "A3SG",
+                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
+                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
                 .bit_shift = 13,
         },
 };