Hi,
On Tuesday 06 March 2012 08:41 PM, Tero Kristo wrote:
From: Vishwanath BS<vishwanath.bs@xxxxxx>
IO Daisychain feature has to be triggered whenever there is a change in
device's mux configuration (See section 3.9.4 in OMAP4 Public TRM vP).
Now devices can idle independent of the powerdomain, there can be a
window where device is idled and corresponding powerdomain can be
ON/INACTIVE state. In such situations, since both module wake up is
enabled at padlevel as well as io daisychain sequence is triggered,
there will be 2 PRCM interrupts (Module async wake up via swakeup and
IO Pad interrupt). But as PRCM Interrupt handler clears the Module
Padlevel WKST bit in the first interrupt, module specific interrupt
handler will not triggered for the second time
Also look at detailed explanation given by Rajendra at
http://www.spinics.net/lists/linux-serial/msg04480.html
Signed-off-by: Vishwanath BS<vishwanath.bs@xxxxxx>
Signed-off-by: Tero Kristo<t-kristo@xxxxxx>
---
arch/arm/mach-omap2/omap_hwmod.c | 9 +++++++--
arch/arm/mach-omap2/pm.c | 21 +++++++++++++++++++++
arch/arm/mach-omap2/pm.h | 1 +
3 files changed, 29 insertions(+), 2 deletions(-)
/* Types of sleep_switch used in omap_set_pwrdm_state */
#define FORCEWAKEUP_SWITCH 0
#define LOWPOWERSTATE_SWITCH 1
@@ -221,6 +236,12 @@ static int __init omap2_common_pm_init(void)
omap2_init_processor_devices();
omap_pm_if_init();
+ if (cpu_is_omap34xx()&& omap3_has_io_chain_ctrl())
+ io_chain_trigger_func = omap3_trigger_io_chain;
While testing with one of Tero's OMAP4 OFF mode support branches (which
also include these patches) I found a OMAP4 standalone build fails
here..
CC arch/arm/mach-omap2/omap_hwmod.o
arch/arm/mach-omap2/omap_hwmod.c: In function '_reconfigure_io_chain':
arch/arm/mach-omap2/omap_hwmod.c:1797: error: implicit declaration of
function 'omap3xxx_prm_reconfigure_io_chain'
make[1]: *** [arch/arm/mach-omap2/omap_hwmod.o] Error 1
make: *** [arch/arm/mach-omap2] Error 2
regards,
Rajendra
+
+ if (cpu_is_omap44xx())
+ io_chain_trigger_func = omap4_trigger_io_chain;
+
return 0;
}
postcore_initcall(omap2_common_pm_init);
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index b737b11..f9dac40 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -22,6 +22,7 @@ extern int omap3_can_sleep(void);
extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
extern int omap3_idle_init(void);
extern int omap4_idle_init(void);
+extern void omap_trigger_io_chain(void);
#if defined(CONFIG_PM_OPP)
extern int omap3_opp_init(void);
--
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