On 09/15/2013 04:34 PM, Gregory CLEMENT wrote:

Hi Daniel,

thanks for you review,

On 13/09/2013 17:36, Daniel Lezcano wrote:

quoted

On 09/13/2013 12:06 PM, Gregory CLEMENT wrote:

quoted

Add the wfi, cpu idle and cpu deep idle power states support for the
Armada XP SoCs.

All the latencies and the power consumption values used at the
"armada_370_xp_idle_driver" structure are preliminary and will be
modified in the future after running some measurements and analysis.

Based on the work of Nadav Haklai.

Signed-off-by: Nadav Haklai <redacted>
Signed-off-by: Gregory CLEMENT <redacted>
---
 drivers/cpuidle/Kconfig.arm             |   5 ++
 drivers/cpuidle/Makefile                |   1 +
 drivers/cpuidle/cpuidle-armada-370-xp.c | 103 ++++++++++++++++++++++++++++++++
 drivers/cpuidle/suspend-armada-370-xp.S |  91 ++++++++++++++++++++++++++++

Somehow, you will have to move "suspend-armada-370-xp.S" into arch/arm.

Does it mean that you want I move it for the next version?

Yes please.

[ ... ]

quoted

quoted

+static struct cpuidle_driver armada_370_xp_idle_driver = {
+	.name			= "armada_370_xp_idle",
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.states[1]		= {
+		.enter			= armada_370_xp_enter_idle,
+		.exit_latency		= 10,
+		.power_usage		= 50,
+		.target_residency	= 100,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "MV CPU IDLE",
+		.desc			= "CPU power down",
+	},
+	.states[2]		= {
+		.enter			= armada_370_xp_enter_idle,
+		.exit_latency		= 100,
+		.power_usage		= 5,
+		.target_residency	= 1000,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "MV CPU DEEP IDLE",
+		.desc			= "CPU and L2 Fabric power down",
+	},
+	.state_count = ARMADA_370_XP_MAX_STATES,
+};

What about the local timers ? Are they shutdown ?

I need to chekc it.

Ok, if it is the case, there is the flag CPUIDLE_FLAG_TIMER_STOP to tell
the cpuidle framework to switch to the broadcast timer with this state.

quoted

quoted

+static int __init armada_370_xp_cpuidle_init(void)
+{
+	if (!of_find_compatible_node(NULL, NULL, "marvell,armada-370-xp-pmsu"))
+		return -ENODEV;
+
+	if (!of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+		return -ENODEV;
+
+	pr_info("Initializing Armada-XP CPU power management ");
+
+	armada_370_xp_pmsu_enable_l2_powerdown_onidle();
+
+	return cpuidle_register(&armada_370_xp_idle_driver, NULL);
+}
+
+module_init(armada_370_xp_cpuidle_init);

Isn't it possible to replace it by module_platform_driver ? like ux500
or kirkwood ?

It should be possible indeed, I will check it.

That would be great. It is a nicer approach for the single zImage IMHO.

Thanks !
  -- Daniel

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