[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains... | linux-arm-kernel

[PATCH 00/12] ARM: OMAP2+: powerdomain updates after the functional power state conversion · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 01/12] ARM: OMAP2+: powerdomain: consolidate arch_pwrdm check code · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 02/12] ARM: OMAP2+: PM/powerdomain: move the power state time tracking into the powerdomain code · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 03/12] ARM: OMAP2+: powerdomain: split pwrdm_state_switch() · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 04/12] ARM: OMAP2+: PM: clean up some debugfs functions · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 06/12] ARM: OMAP2+: CM: use the cached copy of the clockdomain's hwsup state · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 07/12] ARM: OMAP2+: powerdomain: cache the powerdomain next power state · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 08/12] ARM: OMAP2+: powerdomain: cache the powerdomain's previous power state · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · Vaibhav Hiremath <hidden> · 2012-12-12
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · Jon Hunter <hidden> · 2012-12-19
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · paul@pwsan.com (Paul Walmsley) · 2012-12-20
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · Santosh Shilimkar <hidden> · 2012-12-21
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · Bedia, Vaibhav <hidden> · 2012-12-26
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · Bedia, Vaibhav <hidden> · 2012-12-26
[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on · paul@pwsan.com (Paul Walmsley) · 2012-12-26
[PATCH 10/12] ARM: OMAP2+: powerdomain: skip previous-power-state read if next_pwrst is ON · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 11/12] ARM: OMAP2xxx: powerdomain: add previous power state tracking · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 12/12] ARM: OMAP2xxx: PM: add pwrdm_(pre|post)_transition() calls to the 2xxx PM code · paul@pwsan.com (Paul Walmsley) · 2012-12-09
[PATCH 00/12] ARM: OMAP2+: powerdomain updates after the functional power state conversion · Tero Kristo <hidden> · 2013-01-04

STALE4931d

[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on

From: Bedia, Vaibhav <hidden>
Date: 2012-12-26 06:21:46
Also in: linux-omap

Hi Paul,

On Mon, Dec 10, 2012 at 01:33:28, Paul Walmsley wrote:

There's no need to determine the current power state for powerdomains
that must be on while the kernel is running.  We mark these
powerdomains with a new flag, PWRDM_ACTIVE_WITH_KERNEL.  Any
powerdomain marked with that flag is reported as being in the ON power
state while the kernel is running.

[...]

quoted hunk ↗ jump to hunk

diff --git a/arch/arm/mach-omap2/powerdomains33xx_data.c b/arch/arm/mach-omap2/powerdomains33xx_data.c
index 869adb8..acb148a 100644
--- a/arch/arm/mach-omap2/powerdomains33xx_data.c
+++ b/arch/arm/mach-omap2/powerdomains33xx_data.c

@@ -123,7 +123,8 @@ static struct powerdomain mpu_33xx_pwrdm = {
 	.pwrstst_offs		= AM33XX_PM_MPU_PWRSTST_OFFSET,
 	.pwrsts			= PWRSTS_OFF_RET_ON,
 	.pwrsts_logic_ret	= PWRSTS_OFF_RET,
-	.flags			= PWRDM_HAS_LOWPOWERSTATECHANGE,
+	.flags			= (PWRDM_HAS_LOWPOWERSTATECHANGE |
+				   PWRDM_ACTIVE_WITH_KERNEL),

In case of AM33xx, this flag should be set for PER and WKUP pwrdms also.
EMIF, L3, L4 etc come under PER so this domain can't transition on an active
system. PRCM and Control module come under WKUP, so the WKUP should the kernel
should attempt to transition WKUP domain also.

Regards,
Vaibhav

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