Re: CONFIG_CPU_IDLE broken for N900

2010-08-10 Thread Ameya Palande 
On Tue, 2010-08-10 at 14:21 +0200, Palande Ameya (Nokia-MS/Helsinki)
wrote:
 Hi,
 
 When I enable CONFIG_CPU_IDLE and boot kernel, it hangs around the point
 when it switches to user space. I am able to reproduce this for 2.6.35
 on linux-omap and linux-2.6 trees.
 
 Has anyone else noticed the same thing for omap3 based boards?

Broken on linux-omap-pm as well!

Cheers,
Ameya.

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Re: CONFIG_CPU_IDLE broken for N900

2010-08-10 Thread Jarkko Nikula 
On Tue, 10 Aug 2010 15:35:18 +0300
Ameya Palande ameya.pala...@nokia.com wrote:

  When I enable CONFIG_CPU_IDLE and boot kernel, it hangs around the point
  when it switches to user space. I am able to reproduce this for 2.6.35
  on linux-omap and linux-2.6 trees.
  
  Has anyone else noticed the same thing for omap3 based boards?
 
 Broken on linux-omap-pm as well!
 
I'm able to reproduce with 2.6.35-rc1 but not with l-o head. It seems
that the commit below fixes this.

commit c786bcf12e092802496f1bc440b2b189144612a5
Author: Kevin Hilman khil...@deeprootsystems.com
Date:   Thu Jun 3 17:13:22 2010 +

OMAP3: PM: fix IO daisy chain enable to use PM_WKEN reg


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Re: CONFIG_CPU_IDLE broken for N900

2010-08-10 Thread Ameya Palande 
Hi Jarkko,

On Tue, 2010-08-10 at 15:03 +0200, ext Jarkko Nikula wrote:
 On Tue, 10 Aug 2010 15:35:18 +0300
 Ameya Palande ameya.pala...@nokia.com wrote:
 
   When I enable CONFIG_CPU_IDLE and boot kernel, it hangs around the point
   when it switches to user space. I am able to reproduce this for 2.6.35
   on linux-omap and linux-2.6 trees.
   
   Has anyone else noticed the same thing for omap3 based boards?
  
  Broken on linux-omap-pm as well!
  
 I'm able to reproduce with 2.6.35-rc1 but not with l-o head. It seems
 that the commit below fixes this.
 
 commit c786bcf12e092802496f1bc440b2b189144612a5
 Author: Kevin Hilman khil...@deeprootsystems.com
 Date:   Thu Jun 3 17:13:22 2010 +
 
 OMAP3: PM: fix IO daisy chain enable to use PM_WKEN reg

Just tested it on linux-omap with omap3_defconfig and found that it is
broken. When kernel bootup is complete, and it switches to user space,
device hangs. When I disable CPU IDLE, it works..

Cheers,
Ameya.

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Re: CONFIG_CPU_IDLE broken for N900

2010-08-10 Thread Jarkko Nikula 
On Tue, 10 Aug 2010 16:43:16 +0300
Ameya Palande ameya.pala...@nokia.com wrote:

  I'm able to reproduce with 2.6.35-rc1 but not with l-o head. It seems
  that the commit below fixes this.
  
  commit c786bcf12e092802496f1bc440b2b189144612a5
  Author: Kevin Hilman khil...@deeprootsystems.com
  Date:   Thu Jun 3 17:13:22 2010 +
  
  OMAP3: PM: fix IO daisy chain enable to use PM_WKEN reg
 
 Just tested it on linux-omap with omap3_defconfig and found that it is
 broken. When kernel bootup is complete, and it switches to user space,
 device hangs. When I disable CPU IDLE, it works..
 
And I was too fast, problem is there in l-o head but it seems to hang in
different places for me. Above commit removed Wake up daisy chain
activation failed. error that was slowing down the boot but this issue
seems to be different.

I can boot up to Debian console login but system hangs during user
space boot if I send something over serial. This happend with
omap3_defconfig in l-o head using N900. However, the same kernel works
fine on Beagle. Can this be some silicon dependent issue?


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Re: CONFIG_CPU_IDLE broken for N900

2010-08-10 Thread Kevin Hilman 
Ameya Palande ameya.pala...@nokia.com writes:

 When I enable CONFIG_CPU_IDLE and boot kernel, it hangs around the point
 when it switches to user space. I am able to reproduce this for 2.6.35
 on linux-omap and linux-2.6 trees.

 Has anyone else noticed the same thing for omap3 based boards?

I was able to reproduce on my n900 and found the problem.  I believe
this is the same problem that has been haunting the Overo folks in that
their console (on UART2 like n900) was not responding after suspend.

The patch below fixes the problem for me, and will post an official
version shortly.

Tested with l-o master (omap3_defconfig + CONFIG_CPU_IDLE=y) as well
with current PM branch.  PM branch (specifically pm-fixes sub-branch)
has been updated to include this fix.

Kevin


diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index fb4994a..7b03426 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -480,7 +480,9 @@ void omap_sram_idle(void)
}
 
/* Disable IO-PAD and IO-CHAIN wakeup */
-   if (omap3_has_io_wakeup()  core_next_state  PWRDM_POWER_ON) {
+   if (omap3_has_io_wakeup() 
+   (per_next_state  PWRDM_POWER_ON ||
+core_next_state  PWRDM_POWER_ON)) {
prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
omap3_disable_io_chain();
}
-- 
1.7.2.1



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