[PATCH 11/12] ARM: OMAP2xxx: powerdomain: add previous power state tracking

[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

STALE4927d

From: paul@pwsan.com (Paul Walmsley)
Date: 2012-12-09 20:03:31
Also in: linux-omap
Subsystem: arm port, omap powerdomain soc adaptation layer support, omap2+ support, the rest · Maintainers: Russell King, Paul Walmsley, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds

The OMAP2xxx PRM does support a form of powerdomain previous-power-state
tracking; so add it.  This allows the power state tracking and debugging
code to do something useful on this platform.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
---
 arch/arm/mach-omap2/prm2xxx.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
index e4cdb69..2d3c905 100644
--- a/arch/arm/mach-omap2/prm2xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx.c

@@ -180,10 +180,22 @@ static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
 	return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
 }
 
+static int omap2xxx_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+	u8 omap2xxx_pwrst;
+
+	omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+						       OMAP2_PM_PWSTST,
+						       OMAP24XX_LASTSTATEENTERED_MASK);
+
+	return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
+}
+
 struct pwrdm_ops omap2_pwrdm_operations = {
 	.pwrdm_set_next_pwrst	= omap2xxx_pwrdm_set_next_pwrst,
 	.pwrdm_read_next_pwrst	= omap2xxx_pwrdm_read_next_pwrst,
 	.pwrdm_read_pwrst	= omap2xxx_pwrdm_read_pwrst,
+	.pwrdm_read_prev_pwrst	= omap2xxx_pwrdm_read_prev_pwrst,
 	.pwrdm_set_logic_retst	= omap2_pwrdm_set_logic_retst,
 	.pwrdm_set_mem_onst	= omap2_pwrdm_set_mem_onst,
 	.pwrdm_set_mem_retst	= omap2_pwrdm_set_mem_retst,

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