[v3 1/2] ARM: Add API to detect SCU base address from CP15

[v3 1/2] ARM: Add API to detect SCU base address from CP15

[Hiroshi Doyu]

Add API to detect SCU base address from CP15.

Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
Update: Use Russell's suggestion,
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/143321.html
---
 arch/arm/include/asm/smp_scu.h |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h
index 4eb6d00..006f026 100644
--- a/arch/arm/include/asm/smp_scu.h
+++ b/arch/arm/include/asm/smp_scu.h
@@ -6,6 +6,23 @@
 #define SCU_PM_POWEROFF	3
 
 #ifndef __ASSEMBLER__
+
+#include <asm/cputype.h>
+
+static inline bool scu_a9_has_base(void)
+{
+	return read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9;
+}
+
+static inline unsigned long scu_a9_get_base(void)
+{
+	unsigned long pa;
+
+	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa));
+
+	return pa;
+}
+
 unsigned int scu_get_core_count(void __iomem *);
 void scu_enable(void __iomem *);
 int scu_power_mode(void __iomem *, unsigned int);
-- 
1.7.9.5

[v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
---
 arch/arm/mach-tegra/platsmp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 689ee4b..8853bd2 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -38,7 +38,6 @@
 extern void tegra_secondary_startup(void);
 
 static cpumask_t tegra_cpu_init_mask;
-static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE);
 
 #define EVP_CPU_RESET_VECTOR \
 	(IO_ADDRESS(TEGRA_EXCEPTION_VECTORS_BASE) + 0x100)
@@ -187,7 +186,8 @@ static void __init tegra_smp_prepare_cpus(unsigned int max_cpus)
 	/* Always mark the boot CPU (CPU0) as initialized. */
 	cpumask_set_cpu(0, &tegra_cpu_init_mask);
 
-	scu_enable(scu_base);
+	if (scu_a9_has_base())
+		scu_enable(IO_ADDRESS(scu_a9_get_base()));
 }
 
 struct smp_operations tegra_smp_ops __initdata = {
-- 
1.7.9.5

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Santosh Shilimkar]

On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>
> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
Looks fine. I will also update OMAP code with the new
interface. Thanks.

For the patch,
Acked-by: Santosh Shilimkar<santosh.shilimkar-l0cyMroinI0@public.gmane.org>

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Stephen Warren]

On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>
>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>> ---
> Looks fine. I will also update OMAP code with the new
> interface. Thanks.

OK, so patch 1/2 at least needs to get into a stable arm-soc branch
then. Unless there are violent objections, I'll forward patch 1/2 to
arm-soc and request it be added into a branch so that Tegra and OMAP can
both merge it into their branches as a dependency. I guess patch 2/2
could also be included; I don't think it has any complex dependencies
that'd prevent that, and would help to show how patch 1/2 gets used.

Hiroshi, is this series the only dependency you need for your Tegra114
series? So, I could merge your Tegra114 series once this series is applied?

> For the patch,
> Acked-by: Santosh Shilimkar<santosh.shilimkar-l0cyMroinI0@public.gmane.org>

Thanks.

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Olof Johansson]

On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>>
>>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>> ---
>> Looks fine. I will also update OMAP code with the new
>> interface. Thanks.
>
> OK, so patch 1/2 at least needs to get into a stable arm-soc branch
> then. Unless there are violent objections, I'll forward patch 1/2 to
> arm-soc and request it be added into a branch so that Tegra and OMAP can
> both merge it into their branches as a dependency. I guess patch 2/2
> could also be included; I don't think it has any complex dependencies
> that'd prevent that, and would help to show how patch 1/2 gets used.
>
> Hiroshi, is this series the only dependency you need for your Tegra114
> series? So, I could merge your Tegra114 series once this series is applied?

For something like this, it might make more sense for us to just apply
the patches for OMAP on top, i.e. we'll pull the short branch from
you, and then we can just apply patches (with maintainer acks) on top,
instead of doing a bunch of single-patch pulls.

Since Russell had comments on it earlier, I'd like him to give a nod
that he's happy with it too.


-Olof

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Santosh Shilimkar]

[-- Attachment #1: Type: text/plain, Size: 4154 bytes --]

On Tuesday 22 January 2013 10:34 PM, Olof Johansson wrote:
> On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
>> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
>>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>>>
>>>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>> ---
>>> Looks fine. I will also update OMAP code with the new
>>> interface. Thanks.
>>
>> OK, so patch 1/2 at least needs to get into a stable arm-soc branch
>> then. Unless there are violent objections, I'll forward patch 1/2 to
>> arm-soc and request it be added into a branch so that Tegra and OMAP can
>> both merge it into their branches as a dependency. I guess patch 2/2
>> could also be included; I don't think it has any complex dependencies
>> that'd prevent that, and would help to show how patch 1/2 gets used.
>>
>> Hiroshi, is this series the only dependency you need for your Tegra114
>> series? So, I could merge your Tegra114 series once this series is applied?
>
> For something like this, it might make more sense for us to just apply
> the patches for OMAP on top, i.e. we'll pull the short branch from
> you, and then we can just apply patches (with maintainer acks) on top,
> instead of doing a bunch of single-patch pulls.
>
In case you decide to apply patches, you can use patch in the end
of the email for OMAP. Attached the same in case mailer damages it.

Btw, I noticed the build error with patch 1/1. Since I wasn't using
the first interface in OMAP code, I just bypassed it for testing.
I might be missing some dependent patch which added
read_cpuid_part_number().

---------------
In file included from arch/arm/kernel/smp_scu.c:15:0:
linux-2.6/arch/arm/include/asm/smp_scu.h: In function 'scu_a9_has_base':
linux-2.6/arch/arm/include/asm/smp_scu.h:14:2: error: implicit 
declaration of function 'read_cpuid_part_number' 
[-Werror=implicit-function-declaration]
linux-2.6/arch/arm/include/asm/smp_scu.h:14:37: error: 
'ARM_CPU_PART_CORTEX_A9' undeclared (first use in this function)
linux-2.6/arch/arm/include/asm/smp_scu.h:14:37: note: each undeclared 
identifier is reported only once for each function it appears in
cc1: some warnings being treated as errors
make[1]: *** [arch/arm/kernel/smp_scu.o] Error 1
make: *** [arch/arm/kernel] Error 2
---------------------------------

Regards
Santosh

 From 9760cd0ed93b48ec22584e89979cd4a8ec65b938 Mon Sep 17 00:00:00 2001
From: Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org>
Date: Wed, 23 Jan 2013 13:56:19 +0530
Subject: [PATCH] ARM: OMAP: Make use of available scu_a9_get_base() 
interface

Drop the define and make use of scu_a9_get_base() which reads
the physical address of SCU from CP15 register.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org>
---
  arch/arm/mach-omap2/omap-smp.c |    2 +-
  arch/arm/mach-omap2/omap44xx.h |    1 -
  2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index cd42d92..e683d0d 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -215,7 +215,7 @@ static void __init omap4_smp_init_cpus(void)
  		 * Currently we can't call ioremap here because
  		 * SoC detection won't work until after init_early.
  		 */
-		scu_base =  OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
+		scu_base =  OMAP2_L4_IO_ADDRESS(scu_a9_get_base());
  		BUG_ON(!scu_base);
  		ncores = scu_get_core_count(scu_base);
  	} else if (cpu_id == CPU_CORTEX_A15) {
diff --git a/arch/arm/mach-omap2/omap44xx.h b/arch/arm/mach-omap2/omap44xx.h
index 43b927b..8a515bb 100644
--- a/arch/arm/mach-omap2/omap44xx.h
+++ b/arch/arm/mach-omap2/omap44xx.h
@@ -40,7 +40,6 @@
  #define OMAP44XX_GIC_DIST_BASE		0x48241000
  #define OMAP44XX_GIC_CPU_BASE		0x48240100
  #define OMAP44XX_IRQ_GIC_START		32
-#define OMAP44XX_SCU_BASE		0x48240000
  #define OMAP44XX_LOCAL_TWD_BASE		0x48240600
  #define OMAP44XX_L2CACHE_BASE		0x48242000
  #define OMAP44XX_WKUPGEN_BASE		0x48281000
-- 
1.7.9.5



[-- Attachment #2: 0001-ARM-OMAP-Make-use-of-available-scu_a9_get_base-inter.patch --]
[-- Type: text/x-patch, Size: 1670 bytes --]

From 9760cd0ed93b48ec22584e89979cd4a8ec65b938 Mon Sep 17 00:00:00 2001
From: Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org>
Date: Wed, 23 Jan 2013 13:56:19 +0530
Subject: [PATCH] ARM: OMAP: Make use of available scu_a9_get_base() interface

Drop the define and make use of scu_a9_get_base() which reads
the physical address of SCU from CP15 register.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org>
---
 arch/arm/mach-omap2/omap-smp.c |    2 +-
 arch/arm/mach-omap2/omap44xx.h |    1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index cd42d92..e683d0d 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -215,7 +215,7 @@ static void __init omap4_smp_init_cpus(void)
 		 * Currently we can't call ioremap here because
 		 * SoC detection won't work until after init_early.
 		 */
-		scu_base =  OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
+		scu_base =  OMAP2_L4_IO_ADDRESS(scu_a9_get_base());
 		BUG_ON(!scu_base);
 		ncores = scu_get_core_count(scu_base);
 	} else if (cpu_id == CPU_CORTEX_A15) {
diff --git a/arch/arm/mach-omap2/omap44xx.h b/arch/arm/mach-omap2/omap44xx.h
index 43b927b..8a515bb 100644
--- a/arch/arm/mach-omap2/omap44xx.h
+++ b/arch/arm/mach-omap2/omap44xx.h
@@ -40,7 +40,6 @@
 #define OMAP44XX_GIC_DIST_BASE		0x48241000
 #define OMAP44XX_GIC_CPU_BASE		0x48240100
 #define OMAP44XX_IRQ_GIC_START		32
-#define OMAP44XX_SCU_BASE		0x48240000
 #define OMAP44XX_LOCAL_TWD_BASE		0x48240600
 #define OMAP44XX_L2CACHE_BASE		0x48242000
 #define OMAP44XX_WKUPGEN_BASE		0x48281000
-- 
1.7.9.5

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org> wrote @ Wed, 23 Jan 2013 09:58:08 +0100:

> On Tuesday 22 January 2013 10:34 PM, Olof Johansson wrote:
> > On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
> >> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
> >>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
> >>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
> >>>>
> >>>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> >>>> ---
> >>> Looks fine. I will also update OMAP code with the new
> >>> interface. Thanks.
> >>
> >> OK, so patch 1/2 at least needs to get into a stable arm-soc branch
> >> then. Unless there are violent objections, I'll forward patch 1/2 to
> >> arm-soc and request it be added into a branch so that Tegra and OMAP can
> >> both merge it into their branches as a dependency. I guess patch 2/2
> >> could also be included; I don't think it has any complex dependencies
> >> that'd prevent that, and would help to show how patch 1/2 gets used.
> >>
> >> Hiroshi, is this series the only dependency you need for your Tegra114
> >> series? So, I could merge your Tegra114 series once this series is applied?
> >
> > For something like this, it might make more sense for us to just apply
> > the patches for OMAP on top, i.e. we'll pull the short branch from
> > you, and then we can just apply patches (with maintainer acks) on top,
> > instead of doing a bunch of single-patch pulls.
> >
> In case you decide to apply patches, you can use patch in the end
> of the email for OMAP. Attached the same in case mailer damages it.
> 
> Btw, I noticed the build error with patch 1/1. Since I wasn't using
> the first interface in OMAP code, I just bypassed it for testing.
> I might be missing some dependent patch which added
> read_cpuid_part_number().

The following one, which is in "next-20130123", is also necessary.

commit 59530adc3f1b802c275f0197fc3ac72dc014267a
Author: Christoffer Dall <c.dall-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
Date:   Tue Dec 18 04:06:37 2012 +0000

    ARM: Define CPU part numbers and implementors

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Santosh Shilimkar]

On Wednesday 23 January 2013 04:28 PM, Hiroshi Doyu wrote:
> Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org> wrote @ Wed, 23 Jan 2013 09:58:08 +0100:
>
>> On Tuesday 22 January 2013 10:34 PM, Olof Johansson wrote:
>>> On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
>>>> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
>>>>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>>>>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.

[..]

>> Btw, I noticed the build error with patch 1/1. Since I wasn't using
>> the first interface in OMAP code, I just bypassed it for testing.
>> I might be missing some dependent patch which added
>> read_cpuid_part_number().
>
> The following one, which is in "next-20130123", is also necessary.
>
> commit 59530adc3f1b802c275f0197fc3ac72dc014267a
> Author: Christoffer Dall <c.dall-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
> Date:   Tue Dec 18 04:06:37 2012 +0000
>
>      ARM: Define CPU part numbers and implementors
>
Thanks for the pointer Hiroshi.

Regards,
Santosh

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Stephen Warren]

On 01/23/2013 01:58 AM, Santosh Shilimkar wrote:
> On Tuesday 22 January 2013 10:34 PM, Olof Johansson wrote:
>> On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren
>> <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
>>> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
>>>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>>>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>>>>
>>>>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>>> ---
>>>> Looks fine. I will also update OMAP code with the new
>>>> interface. Thanks.
>>>
>>> OK, so patch 1/2 at least needs to get into a stable arm-soc branch
>>> then. Unless there are violent objections, I'll forward patch 1/2 to
>>> arm-soc and request it be added into a branch so that Tegra and OMAP can
>>> both merge it into their branches as a dependency. I guess patch 2/2
>>> could also be included; I don't think it has any complex dependencies
>>> that'd prevent that, and would help to show how patch 1/2 gets used.
>>>
>>> Hiroshi, is this series the only dependency you need for your Tegra114
>>> series? So, I could merge your Tegra114 series once this series is
>>> applied?
>>
>> For something like this, it might make more sense for us to just apply
>> the patches for OMAP on top, i.e. we'll pull the short branch from
>> you, and then we can just apply patches (with maintainer acks) on top,
>> instead of doing a bunch of single-patch pulls.
>
> In case you decide to apply patches, you can use patch in the end
> of the email for OMAP. Attached the same in case mailer damages it.
> 
> Btw, I noticed the build error with patch 1/1. Since I wasn't using
> the first interface in OMAP code, I just bypassed it for testing.
> I might be missing some dependent patch which added
> read_cpuid_part_number().

Thanks for the OMAP patch. I have pushed a couple of temporary and
non-stable branches to:

git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra.git

Branch scu-base-rework contains just the SCU base address patches. After
the few things listed below, I'll rename this branch and send a pull
request to arm-soc.

1) Olof asked that Russell Ack or otherwise OK Hiroshi's latest versions
of the following two patches since he commented on previous versions:

ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9
ARM: Add API to detect SCU base address from CP15

2) Lorenzo's last comment on "ARM: tegra: Use DT /cpu node to detect
number of CPU core" was:

Please add missing punctuation, reword the commit log to make it clearer.

... so that patch needs a reworded commit log.

3) This branch needs testing on both Tegra30 and OMAP (I'm away from the
office at the moment and can only test on Tegra20 here),

Branch test-test-hdoyu-t114 contains the most recent version of the
Tegra114 series from Hiroshi, mainly for my local testing etc. Hiroshi
said he will repost an updated version based on the latest Tegra common
clock framework changes. For the record, what I plan to do when applying
this is:

1) Merge the renamed tmp/scu-base-rework into Tegra's for-3.9/soc.

2) Apply the new posting of the Tegra114 patch series.

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Santosh Shilimkar]

Stephen,

On Thursday 24 January 2013 10:34 AM, Stephen Warren wrote:
> On 01/23/2013 01:58 AM, Santosh Shilimkar wrote:
>> On Tuesday 22 January 2013 10:34 PM, Olof Johansson wrote:
>>> On Tue, Jan 22, 2013 at 8:57 AM, Stephen Warren
>>> <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
>>>> On 01/21/2013 11:07 PM, Santosh Shilimkar wrote:
>>>>> On Tuesday 22 January 2013 11:22 AM, Hiroshi Doyu wrote:
>>>>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>>>>>
>>>>>> Signed-off-by: Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>>>> ---
>>>>> Looks fine. I will also update OMAP code with the new
>>>>> interface. Thanks.
>>>>
>>>> OK, so patch 1/2 at least needs to get into a stable arm-soc branch
>>>> then. Unless there are violent objections, I'll forward patch 1/2 to
>>>> arm-soc and request it be added into a branch so that Tegra and OMAP can
>>>> both merge it into their branches as a dependency. I guess patch 2/2
>>>> could also be included; I don't think it has any complex dependencies
>>>> that'd prevent that, and would help to show how patch 1/2 gets used.
>>>>
>>>> Hiroshi, is this series the only dependency you need for your Tegra114
>>>> series? So, I could merge your Tegra114 series once this series is
>>>> applied?
>>>
>>> For something like this, it might make more sense for us to just apply
>>> the patches for OMAP on top, i.e. we'll pull the short branch from
>>> you, and then we can just apply patches (with maintainer acks) on top,
>>> instead of doing a bunch of single-patch pulls.
>>
>> In case you decide to apply patches, you can use patch in the end
>> of the email for OMAP. Attached the same in case mailer damages it.
>>
>> Btw, I noticed the build error with patch 1/1. Since I wasn't using
>> the first interface in OMAP code, I just bypassed it for testing.
>> I might be missing some dependent patch which added
>> read_cpuid_part_number().
>
> Thanks for the OMAP patch. I have pushed a couple of temporary and
> non-stable branches to:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra.git
>
> Branch scu-base-rework contains just the SCU base address patches. After
> the few things listed below, I'll rename this branch and send a pull
> request to arm-soc.
>
> 1) Olof asked that Russell Ack or otherwise OK Hiroshi's latest versions
> of the following two patches since he commented on previous versions:
>
> ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9
> ARM: Add API to detect SCU base address from CP15
>
> 2) Lorenzo's last comment on "ARM: tegra: Use DT /cpu node to detect
> number of CPU core" was:
>
> Please add missing punctuation, reword the commit log to make it clearer.
>
> ... so that patch needs a reworded commit log.
>
> 3) This branch needs testing on both Tegra30 and OMAP (I'm away from the
> office at the moment and can only test on Tegra20 here),
>
Tested 'scu-base-rework' branch on OMAP and it works just fine. I
noticed that the OMAP patch subject got line wrapped. Can you
please fix that before sending pull request ?
Thanks for picking up the patch.

Regards,
Santosh

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote @ Thu, 24 Jan 2013 06:04:55 +0100:

> Branch scu-base-rework contains just the SCU base address patches. After
> the few things listed below, I'll rename this branch and send a pull
> request to arm-soc.
> 
....
> 2) Lorenzo's last comment on "ARM: tegra: Use DT /cpu node to detect
> number of CPU core" was:
> 
> Please add missing punctuation, reword the commit log to make it clearer.
> 
> ... so that patch needs a reworded commit log.

I fixed. I'll send this[1] as a part of the "Tegra114 series(v4)" today.

[1] ARM: tegra: Use DT /cpu node to detect number of CPU core

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Hi Russell,

On Tue, 22 Jan 2013 18:04:46 +0100
Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org> wrote:

> Since Russell had comments on it earlier, I'd like him to give a nod
> that he's happy with it too.

Is this ok for you?

The original patch is:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/143552.html

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Russell King - ARM Linux]

On Mon, Jan 28, 2013 at 09:18:55AM +0200, Hiroshi Doyu wrote:
> Hi Russell,
> 
> On Tue, 22 Jan 2013 18:04:46 +0100
> Olof Johansson <olof@lixom.net> wrote:
> 
> > Since Russell had comments on it earlier, I'd like him to give a nod
> > that he's happy with it too.
> 
> Is this ok for you?
> 
> The original patch is:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/143552.html

Yes, this version is much better, thanks.

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Stephen Warren <swarren@wwwdotorg.org> wrote @ Tue, 22 Jan 2013 17:57:39 +0100:

> Hiroshi, is this series the only dependency you need for your
> Tegra114

Basically yes.

> series? So, I could merge your Tegra114 series once this series is applied?

But now "CCF" seems to be in. Then, the HACK(*1) needs to be replaced
with "Tegra114 CCF". But "Tegra114 CCF" doesn't seem ready yet. I'll check
if this Tegra114 series would work without "Tegra114 CCF".

*1: http://patchwork.ozlabs.org/patch/212010/

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Hiroshi Doyu]

Hiroshi Doyu <hdoyu@nvidia.com> wrote @ Wed, 23 Jan 2013 08:04:57 +0200 (EET):

> Stephen Warren <swarren@wwwdotorg.org> wrote @ Tue, 22 Jan 2013 17:57:39 +0100:
> 
> > Hiroshi, is this series the only dependency you need for your
> > Tegra114
> 
> Basically yes.
> 
> > series? So, I could merge your Tegra114 series once this series is applied?
> 
> But now "CCF" seems to be in. Then, the HACK(*1) needs to be replaced
> with "Tegra114 CCF". But "Tegra114 CCF" doesn't seem ready yet. I'll check
> if this Tegra114 series would work without "Tegra114 CCF".
> 
> *1: http://patchwork.ozlabs.org/patch/212010/

Stephen,

Verified "Tegra114 series" worked with "for-3.9/soc" branch(inc CCF)
with a little tweak.

I can post Tegra114 series again. If you want them rebased onto
another branch, let me know.

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Stephen Warren]

On 01/23/2013 02:27 AM, Hiroshi Doyu wrote:
> Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> wrote @ Wed, 23 Jan 2013 08:04:57 +0200 (EET):
> 
>> Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote @ Tue, 22 Jan 2013 17:57:39 +0100:
>>
>>> Hiroshi, is this series the only dependency you need for your
>>> Tegra114
>>
>> Basically yes.
>>
>>> series? So, I could merge your Tegra114 series once this series is applied?
>>
>> But now "CCF" seems to be in. Then, the HACK(*1) needs to be replaced
>> with "Tegra114 CCF". But "Tegra114 CCF" doesn't seem ready yet. I'll check
>> if this Tegra114 series would work without "Tegra114 CCF".
>>
>> *1: http://patchwork.ozlabs.org/patch/212010/
> 
> Stephen,
> 
> Verified "Tegra114 series" worked with "for-3.9/soc" branch(inc CCF)
> with a little tweak.

Good news.

> I can post Tegra114 series again. If you want them rebased onto
> another branch, let me know.

Yes please. I will apply them to for-3.9/soc. Please assume that
for-3.9/soc will already contain "ARM: Define CPU part numbers and
implementors", and your two SCU-related patches. Include your "ARM:
tegra: Use DT /cpu node to detect number of CPU core" as the first patch
in the series. I assume that is all of the dependencies; if I've
forgotten anything, please point it out. Thanks.

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Stephen Warren]

On 01/21/2013 10:52 PM, Hiroshi Doyu wrote:
> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.

Will, is your for-next/perf branch stable; can I pull it into a branch
destined for arm-soc? Background below:

Uggh.

This patch (2/2) depends on "ARM: tegra: Use DT /cpu node to detect
number of CPU core" from your Tegra114 series, since that patch removes
the other use of scu_base, thus allowing this patch to remove that variable.

Then, that patch depends on "ARM: Define CPU part numbers and
implementors" from Will Deacon's ARM perf tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git for-next/perf

That means that in order to put this series into arm-soc, we would have
to pull in Will's perf branch first, then the following Tegra patches,
the latter two of which are already in Tegra's for-next, so I'd have to
pull them out:

0bb7bd9 ARM: tegra: Use DT /cpu node to detect number of CPU core
a8f5f25 ARM: tegra: Add CPU nodes to Tegra30 device tree
9975516 ARM: tegra: Add CPU nodes to Tegra20 device tree

Hiroshi, it would be extremely useful if you could explicitly specify
the dependencies of your series when posting them; it took me a long
time and a lot of searching to track all the dependencies down. :-(

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Will Deacon]

Hi Stephan,

On Tue, Jan 22, 2013 at 06:35:55PM +0000, Stephen Warren wrote:
> On 01/21/2013 10:52 PM, Hiroshi Doyu wrote:
> > Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
> 
> Will, is your for-next/perf branch stable; can I pull it into a branch
> destined for arm-soc? Background below:

I'm going to send a pull request to Russell tomorrow using my for-rmk/perf
branch, so *that* is stable. You might, however, want to wait for Russell to
push that out because it's also needed for kvm and, as such, will need to
be published anyway.

Sound ok?

Will

Re: [v3 2/2] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9

[Stephen Warren]

On 01/22/2013 11:46 AM, Will Deacon wrote:
> Hi Stephan,
> 
> On Tue, Jan 22, 2013 at 06:35:55PM +0000, Stephen Warren wrote:
>> On 01/21/2013 10:52 PM, Hiroshi Doyu wrote:
>>> Skip scu_enable(scu_base) if CPU is not Cortex A9 with SCU.
>>
>> Will, is your for-next/perf branch stable; can I pull it into a branch
>> destined for arm-soc? Background below:
> 
> I'm going to send a pull request to Russell tomorrow using my for-rmk/perf
> branch, so *that* is stable. You might, however, want to wait for Russell to
> push that out because it's also needed for kvm and, as such, will need to
> be published anyway.
> 
> Sound ok?

I'm assuming rmk's branch will be a stable base, so that sounds great,
thanks.

Re: [v3 1/2] ARM: Add API to detect SCU base address from CP15

[Stephen Warren]

On 01/21/2013 10:52 PM, Hiroshi Doyu wrote:
> Add API to detect SCU base address from CP15.

I've applied these 2 patches and Santosh's OMAP followup to Tegra's
for-3.9/scu-base-rework branch.