Re: [PATCH 08/10] ARM: OMAP5/DRA7: PM: cpuidle MPU CSWR support
From: Daniel Lezcano
Date: Wed Sep 17 2014 - 14:49:40 EST
On 08/22/2014 07:02 AM, Nishanth Menon wrote:
From: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Add OMAP5/DRA74/72 CPUIDLE support.
This patch adds MPUSS low power states in cpuidle.
C1 - CPU0 WFI + CPU1 WFI + MPU ON
C2 - CPU0 RET + CPU1 RET + MPU CSWR
Tested on DRA74/72-EVM for C1 and C2 states.
NOTE: DRA7 does not do voltage scaling as part of retention transition
and has Mercury which speeds up transition paths - Latency numbers are
based on measurements done by toggling GPIOs.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
[ j-keerthy@xxxxxx rework on 3.14]
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
[nm@xxxxxx: updates based on profiling, OMAP5 squashed]
Signed-off-by: Nishanth Menon <nm@xxxxxx>
---
arch/arm/mach-omap2/cpuidle44xx.c | 82 ++++++++++++++++++++++++++++++++++++-
arch/arm/mach-omap2/pm44xx.c | 2 +-
2 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-omap2/cpuidle44xx.c b/arch/arm/mach-omap2/cpuidle44xx.c
index 2498ab0..8ad4f44 100644
--- a/arch/arm/mach-omap2/cpuidle44xx.c
+++ b/arch/arm/mach-omap2/cpuidle44xx.c
@@ -22,6 +22,7 @@
#include "common.h"
#include "pm.h"
#include "prm.h"
+#include "soc.h"
#include "clockdomain.h"
#define MAX_CPUS 2
@@ -31,6 +32,7 @@ struct idle_statedata {
u32 cpu_state;
u32 mpu_logic_state;
u32 mpu_state;
+ u32 mpu_state_vote;
};
static struct idle_statedata omap4_idle_data[] = {
@@ -51,12 +53,26 @@ static struct idle_statedata omap4_idle_data[] = {
},
};
+static struct idle_statedata dra7_idle_data[] = {
+ {
+ .cpu_state = PWRDM_POWER_ON,
+ .mpu_state = PWRDM_POWER_ON,
+ .mpu_logic_state = PWRDM_POWER_ON,
+ },
+ {
+ .cpu_state = PWRDM_POWER_RET,
+ .mpu_state = PWRDM_POWER_RET,
+ .mpu_logic_state = PWRDM_POWER_RET,
+ },
+};
+
static struct powerdomain *mpu_pd, *cpu_pd[MAX_CPUS];
static struct clockdomain *cpu_clkdm[MAX_CPUS];
static atomic_t abort_barrier;
static bool cpu_done[MAX_CPUS];
static struct idle_statedata *state_ptr = &omap4_idle_data[0];
+static DEFINE_RAW_SPINLOCK(mpu_lock);
/* Private functions */
@@ -78,6 +94,32 @@ static int omap_enter_idle_simple(struct cpuidle_device *dev,
return index;
}
+static int omap_enter_idle_smp(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ struct idle_statedata *cx = state_ptr + index;
+ unsigned long flag;
+
+ raw_spin_lock_irqsave(&mpu_lock, flag);
Why do you need this spin_lock_irqsave ? Aren't the local irqs already
disabled ?
+ cx->mpu_state_vote++;
+ if (cx->mpu_state_vote == num_online_cpus()) {
+ pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
+ omap_set_pwrdm_state(mpu_pd, cx->mpu_state);
+ }
+ raw_spin_unlock_irqrestore(&mpu_lock, flag);
+
+ omap4_enter_lowpower(dev->cpu, cx->cpu_state);
+
+ raw_spin_lock_irqsave(&mpu_lock, flag);
+ if (cx->mpu_state_vote == num_online_cpus())
+ omap_set_pwrdm_state(mpu_pd, PWRDM_POWER_ON);
+ cx->mpu_state_vote--;
+ raw_spin_unlock_irqrestore(&mpu_lock, flag);
I am not sure that will work. What happens if a cpu exits idle and then
re-enter idle immediately ?
Could you try a long run of this little program:
https://git.linaro.org/power/pm-qa.git/blob/HEAD:/cpuidle/cpuidle_killer.c
+ return index;
+}
+
static int omap_enter_idle_coupled(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
@@ -224,6 +266,34 @@ static struct cpuidle_driver omap4_idle_driver = {
.safe_state_index = 0,
};
+static struct cpuidle_driver dra7_idle_driver = {
+ .name = "dra7_idle",
+ .owner = THIS_MODULE,
+ .states = {
+ {
+ /* C1 - CPU0 ON + CPU1 ON + MPU ON */
+ .exit_latency = 2 + 2,
+ .target_residency = 5,
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .enter = omap_enter_idle_simple,
+ .name = "C1",
+ .desc = "CPUx WFI, MPUSS ON"
+ },
+ {
+ /* C2 - CPU0 RET + CPU1 RET + MPU CSWR */
+ .exit_latency = 48 + 60,
+ .target_residency = 100,
+ .flags = CPUIDLE_FLAG_TIME_VALID
+ | CPUIDLE_FLAG_TIMER_STOP,
+ .enter = omap_enter_idle_smp,
+ .name = "C2",
+ .desc = "CPUx CSWR, MPUSS CSWR",
+ },
+ },
+ .state_count = ARRAY_SIZE(dra7_idle_data),
+ .safe_state_index = 0,
+};
+
/* Public functions */
/**
@@ -234,6 +304,16 @@ static struct cpuidle_driver omap4_idle_driver = {
*/
int __init omap4_idle_init(void)
{
+ struct cpuidle_driver *idle_driver;
+
+ if (soc_is_dra7xx() || soc_is_omap54xx()) {
+ state_ptr = &dra7_idle_data[0];
+ idle_driver = &dra7_idle_driver;
+ } else {
+ state_ptr = &omap4_idle_data[0];
+ idle_driver = &omap4_idle_driver;
+ }
+
mpu_pd = pwrdm_lookup("mpu_pwrdm");
cpu_pd[0] = pwrdm_lookup("cpu0_pwrdm");
cpu_pd[1] = pwrdm_lookup("cpu1_pwrdm");
@@ -248,5 +328,5 @@ int __init omap4_idle_init(void)
/* Configure the broadcast timer on each cpu */
on_each_cpu(omap_setup_broadcast_timer, NULL, 1);
- return cpuidle_register(&omap4_idle_driver, cpu_online_mask);
+ return cpuidle_register(idle_driver, cpu_online_mask);
}
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index c063833..1d22162 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -293,7 +293,7 @@ int __init omap4_pm_init(void)
/* Overwrite the default cpu_do_idle() */
arm_pm_idle = omap_default_idle;
- if (cpu_is_omap44xx())
+ if (cpu_is_omap44xx() || soc_is_dra7xx() || soc_is_omap54xx())
omap4_idle_init();
err2:
--
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