[PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
driver to work correctly, so enable support for this.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

---
Kukjin and Krzysztof,

As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
whose firmware is broken due leaving CCI in secure mode which means that the
kernel MCPM support can't properly manage CCI.

So if you pick this patch, it should be tested in kernelci before appearing
in linux-next to prevent any boot issues.

But if that happens, I believe that is better to do a fix / workaround in
those broken platforms since nothing prevents users to enable this option
anyways. For example the CCI device node could be disabled in the DTS.

 arch/arm/configs/exynos_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
index 729e2fae3e58..228ee945b8ed 100644
--- a/arch/arm/configs/exynos_defconfig
+++ b/arch/arm/configs/exynos_defconfig
@@ -30,6 +30,7 @@ CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
 CONFIG_CPUFREQ_DT=y
 CONFIG_CPU_IDLE=y
+CONFIG_ARM_BIG_LITTLE_CPUIDLE=y
 CONFIG_ARM_EXYNOS_CPUIDLE=y
 CONFIG_VFP=y
 CONFIG_NEON=y
-- 
2.4.3

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Sjoerd Simons]

On Fri, 2015-08-28 at 10:16 +0200, Javier Martinez Canillas wrote:
> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
> driver to work correctly, so enable support for this.
> 
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> 
> ---
> Kukjin and Krzysztof,
> 
> As you know there are other boards like the Exynos5422 based Odroid 
> XU{3,4}
> whose firmware is broken due leaving CCI in secure mode which means 
> that the
> kernel MCPM support can't properly manage CCI.
> 
> So if you pick this patch, it should be tested in kernelci before 
> appearing
> in linux-next to prevent any boot issues.

I've pushed this patch into Collabora's for-next branch, which should
get picked up by kernelci soonish.

-- 
Sjoerd Simons
Collabora Ltd.

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Hello Sjoerd,

On 08/28/2015 10:51 AM, Sjoerd Simons wrote:
> On Fri, 2015-08-28 at 10:16 +0200, Javier Martinez Canillas wrote:
>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>> driver to work correctly, so enable support for this.
>>
>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>
>> ---
>> Kukjin and Krzysztof,
>>
>> As you know there are other boards like the Exynos5422 based Odroid 
>> XU{3,4}
>> whose firmware is broken due leaving CCI in secure mode which means 
>> that the
>> kernel MCPM support can't properly manage CCI.
>>
>> So if you pick this patch, it should be tested in kernelci before 
>> appearing
>> in linux-next to prevent any boot issues.
> 
> I've pushed this patch into Collabora's for-next branch, which should
> get picked up by kernelci soonish.
>

Awesome, thanks a lot for your help!
 
Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Krzysztof Kozlowski]

W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
> driver to work correctly, so enable support for this.
> 
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> 
> ---
> Kukjin and Krzysztof,
> 
> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
> whose firmware is broken due leaving CCI in secure mode which means that the
> kernel MCPM support can't properly manage CCI.
> 
> So if you pick this patch, it should be tested in kernelci before appearing
> in linux-next to prevent any boot issues.
> 
> But if that happens, I believe that is better to do a fix / workaround in
> those broken platforms since nothing prevents users to enable this option
> anyways. For example the CCI device node could be disabled in the DTS.
> 
>  arch/arm/configs/exynos_defconfig | 1 +
>  1 file changed, 1 insertion(+)

On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:

[    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
assuming 1 slot is available

... so no. NACK :). First the boards, firmware, bootloader or kernel
code have to be fixed.

Best regards,
Krzysztof

> 
> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
> index 729e2fae3e58..228ee945b8ed 100644
> --- a/arch/arm/configs/exynos_defconfig
> +++ b/arch/arm/configs/exynos_defconfig
> @@ -30,6 +30,7 @@ CONFIG_CPU_FREQ=y
>  CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
>  CONFIG_CPUFREQ_DT=y
>  CONFIG_CPU_IDLE=y
> +CONFIG_ARM_BIG_LITTLE_CPUIDLE=y
>  CONFIG_ARM_EXYNOS_CPUIDLE=y
>  CONFIG_VFP=y
>  CONFIG_NEON=y
> 

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Hello Krzysztof,

On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>> driver to work correctly, so enable support for this.
>>
>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>
>> ---
>> Kukjin and Krzysztof,
>>
>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>> whose firmware is broken due leaving CCI in secure mode which means that the
>> kernel MCPM support can't properly manage CCI.
>>
>> So if you pick this patch, it should be tested in kernelci before appearing
>> in linux-next to prevent any boot issues.
>>
>> But if that happens, I believe that is better to do a fix / workaround in
>> those broken platforms since nothing prevents users to enable this option
>> anyways. For example the CCI device node could be disabled in the DTS.
>>
>>  arch/arm/configs/exynos_defconfig | 1 +
>>  1 file changed, 1 insertion(+)
> 
> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>

Thanks for testing, I was expecting that is just that I don't have a
Odroid XU{3,4} board for test here, I guess I should get one.
 
> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
> assuming 1 slot is available
> 
> ... so no. NACK :). First the boards, firmware, bootloader or kernel

Agreed with the nack :)

> code have to be fixed.
>

Or disable CCI, could you please test the following patch [0] so I
can post it properly?
 
> Best regards,
> Krzysztof
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America

[0]:
>From 0fc5649b8d939ccfb7d3be1aa09df5e1f89a5a82 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javier@osg.samsung.com>
Date: Sat, 29 Aug 2015 11:21:39 +0200
Subject: [RFT PATCH] ARM: dts: Disable CCI support for Odroid XU{3,4} boards

The Exynos5422 based Odroid XU{3,4} boards have a broken firmware that
leaves CCI in secure mode which means that the kernel MCPM support can
not properly manage CCI. This causes the machine to hang when entering
into low power states for example triggered by the b.L CPUidle driver.

The patch is based on commit 25217fef3551 ("ARM: dts: disable CCI on
exynos5420 based arndale-octa")

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
index dd8bc86d9de4..1e076458fab6 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
@@ -525,3 +525,7 @@
 	vdd33-supply = <&ldo9_reg>;
 	vdd10-supply = <&ldo11_reg>;
 };
+
+&cci {
+	status = "disabled";
+};
-- 
2.4.3

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Krzysztof Kozlowski]

2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
> Hello Krzysztof,
>
> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>> driver to work correctly, so enable support for this.
>>>
>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>
>>> ---
>>> Kukjin and Krzysztof,
>>>
>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>> kernel MCPM support can't properly manage CCI.
>>>
>>> So if you pick this patch, it should be tested in kernelci before appearing
>>> in linux-next to prevent any boot issues.
>>>
>>> But if that happens, I believe that is better to do a fix / workaround in
>>> those broken platforms since nothing prevents users to enable this option
>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>
>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>
>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>
>
> Thanks for testing, I was expecting that is just that I don't have a
> Odroid XU{3,4} board for test here, I guess I should get one.
>
>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>> assuming 1 slot is available
>>
>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>
> Agreed with the nack :)
>
>> code have to be fixed.
>>
>
> Or disable CCI, could you please test the following patch [0] so I
> can post it properly?

It fixes the boot hang but causes other issues. Not all CPUs boot (I
tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
[    0.010781] CPU0: update cpu_capacity 448
[    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
[    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
[    0.056329] CPU1: update cpu_capacity 448
[    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.071100] CPU2: update cpu_capacity 448
[    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.086103] CPU3: update cpu_capacity 448
[    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.101100] CPU4: update cpu_capacity 1535
[    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
[    1.115009] CPU5: failed to boot: -110
[    2.130019] CPU6: failed to boot: -110
[    3.145049] CPU7: failed to boot: -110
[    3.145151] Brought up 5 CPUs
[    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
[    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
modes (primary CPU mode 0x13)
[    3.145327] CPU: This may indicate a broken bootloader or firmware.
[    3.149347] devtmpfs: initialized

Best regards,
Krzysztof


>
>> Best regards,
>> Krzysztof
>>
>
> Best regards,
> --
> Javier Martinez Canillas
> Open Source Group
> Samsung Research America
>
> [0]:
> From 0fc5649b8d939ccfb7d3be1aa09df5e1f89a5a82 Mon Sep 17 00:00:00 2001
> From: Javier Martinez Canillas <javier@osg.samsung.com>
> Date: Sat, 29 Aug 2015 11:21:39 +0200
> Subject: [RFT PATCH] ARM: dts: Disable CCI support for Odroid XU{3,4} boards
>
> The Exynos5422 based Odroid XU{3,4} boards have a broken firmware that
> leaves CCI in secure mode which means that the kernel MCPM support can
> not properly manage CCI. This causes the machine to hang when entering
> into low power states for example triggered by the b.L CPUidle driver.
>
> The patch is based on commit 25217fef3551 ("ARM: dts: disable CCI on
> exynos5420 based arndale-octa")
>
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> ---
>  arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index dd8bc86d9de4..1e076458fab6 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -525,3 +525,7 @@
>         vdd33-supply = <&ldo9_reg>;
>         vdd10-supply = <&ldo11_reg>;
>  };
> +
> +&cci {
> +       status = "disabled";
> +};
> --
> 2.4.3
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Hello Krzysztof,

On Sat, Aug 29, 2015 at 11:55 AM, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> 2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
>> Hello Krzysztof,
>>
>> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>>> driver to work correctly, so enable support for this.
>>>>
>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>>
>>>> ---
>>>> Kukjin and Krzysztof,
>>>>
>>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>>> kernel MCPM support can't properly manage CCI.
>>>>
>>>> So if you pick this patch, it should be tested in kernelci before appearing
>>>> in linux-next to prevent any boot issues.
>>>>
>>>> But if that happens, I believe that is better to do a fix / workaround in
>>>> those broken platforms since nothing prevents users to enable this option
>>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>>
>>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>
>>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>>
>>
>> Thanks for testing, I was expecting that is just that I don't have a
>> Odroid XU{3,4} board for test here, I guess I should get one.
>>
>>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>>> assuming 1 slot is available
>>>
>>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>>
>> Agreed with the nack :)
>>
>>> code have to be fixed.
>>>
>>
>> Or disable CCI, could you please test the following patch [0] so I
>> can post it properly?
>
> It fixes the boot hang but causes other issues. Not all CPUs boot (I

Thanks for testing.

> tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
> [    0.010781] CPU0: update cpu_capacity 448
> [    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
> [    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
> [    0.056329] CPU1: update cpu_capacity 448
> [    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
> [    0.071100] CPU2: update cpu_capacity 448
> [    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
> [    0.086103] CPU3: update cpu_capacity 448
> [    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
> [    0.101100] CPU4: update cpu_capacity 1535
> [    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
> [    1.115009] CPU5: failed to boot: -110
> [    2.130019] CPU6: failed to boot: -110
> [    3.145049] CPU7: failed to boot: -110
> [    3.145151] Brought up 5 CPUs
> [    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
> [    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
> modes (primary CPU mode 0x13)
> [    3.145327] CPU: This may indicate a broken bootloader or firmware.
> [    3.149347] devtmpfs: initialized
>

Sigh, such an inconsistent behavior between Exynos5420/5422/5800 boards :-/

Any ideas? I agree that the b.L CPUidle support shouldn't be enabled
by default in exynos_defconfig but as I said nothing prevents the user
to enable that option and make the board to hang on boot.

> Best regards,
> Krzysztof
>

Best regards,
Javier

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Krzysztof Kozlowski]

2015-08-29 19:07 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
> Hello Krzysztof,
>
> On Sat, Aug 29, 2015 at 11:55 AM, Krzysztof Kozlowski
> <k.kozlowski@samsung.com> wrote:
>> 2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
>>> Hello Krzysztof,
>>>
>>> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>>>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>>>> driver to work correctly, so enable support for this.
>>>>>
>>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>>>
>>>>> ---
>>>>> Kukjin and Krzysztof,
>>>>>
>>>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>>>> kernel MCPM support can't properly manage CCI.
>>>>>
>>>>> So if you pick this patch, it should be tested in kernelci before appearing
>>>>> in linux-next to prevent any boot issues.
>>>>>
>>>>> But if that happens, I believe that is better to do a fix / workaround in
>>>>> those broken platforms since nothing prevents users to enable this option
>>>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>>>
>>>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>>>
>>>
>>> Thanks for testing, I was expecting that is just that I don't have a
>>> Odroid XU{3,4} board for test here, I guess I should get one.
>>>
>>>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>>>> assuming 1 slot is available
>>>>
>>>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>>>
>>> Agreed with the nack :)
>>>
>>>> code have to be fixed.
>>>>
>>>
>>> Or disable CCI, could you please test the following patch [0] so I
>>> can post it properly?
>>
>> It fixes the boot hang but causes other issues. Not all CPUs boot (I
>
> Thanks for testing.
>
>> tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
>> [    0.010781] CPU0: update cpu_capacity 448
>> [    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
>> [    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
>> [    0.056329] CPU1: update cpu_capacity 448
>> [    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>> [    0.071100] CPU2: update cpu_capacity 448
>> [    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>> [    0.086103] CPU3: update cpu_capacity 448
>> [    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>> [    0.101100] CPU4: update cpu_capacity 1535
>> [    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
>> [    1.115009] CPU5: failed to boot: -110
>> [    2.130019] CPU6: failed to boot: -110
>> [    3.145049] CPU7: failed to boot: -110
>> [    3.145151] Brought up 5 CPUs
>> [    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
>> [    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
>> modes (primary CPU mode 0x13)
>> [    3.145327] CPU: This may indicate a broken bootloader or firmware.
>> [    3.149347] devtmpfs: initialized
>>
>
> Sigh, such an inconsistent behavior between Exynos5420/5422/5800 boards :-/

I put all my hope into Przemyslaw's work :)

>
> Any ideas? I agree that the b.L CPUidle support shouldn't be enabled
> by default in exynos_defconfig but as I said nothing prevents the user
> to enable that option and make the board to hang on boot.

I think these are actually two different issues:
1. If user enables b.L cpuidle manually, some of the Exynos542x boards
would work (Peach Pi, AFAIU?) and some would not (Odroid XU3, probably
also Arndale Octa). If we cannot fix firmware then we could implement
a workaround in Exynos code. However it shouldn't be DTS but rather
the mach code.
2. The default config should be a reference config so it should work
on all boards and should offer all necessary features on them (or even
all features). Enabling the b.L in it makes sense only if it does not
introduce regressions to other boards. If we cannot achieve that
(Odroid XU3 will be affected negatively) then still we could fix issue
#1 so user's manual setting would work.

BR,
Krzysztof

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Hello Krzysztof,

On Sat, Aug 29, 2015 at 12:22 PM, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> 2015-08-29 19:07 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
>> Hello Krzysztof,
>>
>> On Sat, Aug 29, 2015 at 11:55 AM, Krzysztof Kozlowski
>> <k.kozlowski@samsung.com> wrote:
>>> 2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
>>>> Hello Krzysztof,
>>>>
>>>> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>>>>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>>>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>>>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>>>>> driver to work correctly, so enable support for this.
>>>>>>
>>>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>>>>
>>>>>> ---
>>>>>> Kukjin and Krzysztof,
>>>>>>
>>>>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>>>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>>>>> kernel MCPM support can't properly manage CCI.
>>>>>>
>>>>>> So if you pick this patch, it should be tested in kernelci before appearing
>>>>>> in linux-next to prevent any boot issues.
>>>>>>
>>>>>> But if that happens, I believe that is better to do a fix / workaround in
>>>>>> those broken platforms since nothing prevents users to enable this option
>>>>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>>>>
>>>>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>>>>  1 file changed, 1 insertion(+)
>>>>>
>>>>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>>>>
>>>>
>>>> Thanks for testing, I was expecting that is just that I don't have a
>>>> Odroid XU{3,4} board for test here, I guess I should get one.
>>>>
>>>>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>>>>> assuming 1 slot is available
>>>>>
>>>>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>>>>
>>>> Agreed with the nack :)
>>>>
>>>>> code have to be fixed.
>>>>>
>>>>
>>>> Or disable CCI, could you please test the following patch [0] so I
>>>> can post it properly?
>>>
>>> It fixes the boot hang but causes other issues. Not all CPUs boot (I
>>
>> Thanks for testing.
>>
>>> tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
>>> [    0.010781] CPU0: update cpu_capacity 448
>>> [    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
>>> [    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
>>> [    0.056329] CPU1: update cpu_capacity 448
>>> [    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>>> [    0.071100] CPU2: update cpu_capacity 448
>>> [    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>>> [    0.086103] CPU3: update cpu_capacity 448
>>> [    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>>> [    0.101100] CPU4: update cpu_capacity 1535
>>> [    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
>>> [    1.115009] CPU5: failed to boot: -110
>>> [    2.130019] CPU6: failed to boot: -110
>>> [    3.145049] CPU7: failed to boot: -110
>>> [    3.145151] Brought up 5 CPUs
>>> [    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
>>> [    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
>>> modes (primary CPU mode 0x13)
>>> [    3.145327] CPU: This may indicate a broken bootloader or firmware.
>>> [    3.149347] devtmpfs: initialized
>>>
>>
>> Sigh, such an inconsistent behavior between Exynos5420/5422/5800 boards :-/
>
> I put all my hope into Przemyslaw's work :)
>

Me too :)

>>
>> Any ideas? I agree that the b.L CPUidle support shouldn't be enabled
>> by default in exynos_defconfig but as I said nothing prevents the user
>> to enable that option and make the board to hang on boot.
>
> I think these are actually two different issues:
> 1. If user enables b.L cpuidle manually, some of the Exynos542x boards
> would work (Peach Pi, AFAIU?) and some would not (Odroid XU3, probably

Yes, Exynos5800 Peach Pi and Exynos5420 Peach Pit IIRC.

> also Arndale Octa). If we cannot fix firmware then we could implement
> a workaround in Exynos code. However it shouldn't be DTS but rather
> the mach code.

Agreed about adding a workaround in mach code.

> 2. The default config should be a reference config so it should work
> on all boards and should offer all necessary features on them (or even
> all features). Enabling the b.L in it makes sense only if it does not
> introduce regressions to other boards. If we cannot achieve that
> (Odroid XU3 will be affected negatively) then still we could fix issue
> #1 so user's manual setting would work.
>

Yes but if we achieve #1, then I think that b.L CPUidle support should
be enabled by default in exynos_defconfig even when it does not work
on some boards (as long as don't affect negatively) so users of boards
that do work can have that feature out of the box without figuring out
what additional config options needs to be enabled.

Or that's what you meant and I misunderstood?

> BR,
> Krzysztof

Best regards,
Javier

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Krzysztof Kozlowski]

2015-08-29 19:31 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
> Hello Krzysztof,
>
> On Sat, Aug 29, 2015 at 12:22 PM, Krzysztof Kozlowski
> <k.kozlowski@samsung.com> wrote:
>> 2015-08-29 19:07 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
>>> Hello Krzysztof,
>>>
>>> On Sat, Aug 29, 2015 at 11:55 AM, Krzysztof Kozlowski
>>> <k.kozlowski@samsung.com> wrote:
>>>> 2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
>>>>> Hello Krzysztof,
>>>>>
>>>>> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>>>>>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>>>>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>>>>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>>>>>> driver to work correctly, so enable support for this.
>>>>>>>
>>>>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>>>>>
>>>>>>> ---
>>>>>>> Kukjin and Krzysztof,
>>>>>>>
>>>>>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>>>>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>>>>>> kernel MCPM support can't properly manage CCI.
>>>>>>>
>>>>>>> So if you pick this patch, it should be tested in kernelci before appearing
>>>>>>> in linux-next to prevent any boot issues.
>>>>>>>
>>>>>>> But if that happens, I believe that is better to do a fix / workaround in
>>>>>>> those broken platforms since nothing prevents users to enable this option
>>>>>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>>>>>
>>>>>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>>>>>  1 file changed, 1 insertion(+)
>>>>>>
>>>>>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>>>>>
>>>>>
>>>>> Thanks for testing, I was expecting that is just that I don't have a
>>>>> Odroid XU{3,4} board for test here, I guess I should get one.
>>>>>
>>>>>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>>>>>> assuming 1 slot is available
>>>>>>
>>>>>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>>>>>
>>>>> Agreed with the nack :)
>>>>>
>>>>>> code have to be fixed.
>>>>>>
>>>>>
>>>>> Or disable CCI, could you please test the following patch [0] so I
>>>>> can post it properly?
>>>>
>>>> It fixes the boot hang but causes other issues. Not all CPUs boot (I
>>>
>>> Thanks for testing.
>>>
>>>> tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
>>>> [    0.010781] CPU0: update cpu_capacity 448
>>>> [    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
>>>> [    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
>>>> [    0.056329] CPU1: update cpu_capacity 448
>>>> [    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>>>> [    0.071100] CPU2: update cpu_capacity 448
>>>> [    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>>>> [    0.086103] CPU3: update cpu_capacity 448
>>>> [    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>>>> [    0.101100] CPU4: update cpu_capacity 1535
>>>> [    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
>>>> [    1.115009] CPU5: failed to boot: -110
>>>> [    2.130019] CPU6: failed to boot: -110
>>>> [    3.145049] CPU7: failed to boot: -110
>>>> [    3.145151] Brought up 5 CPUs
>>>> [    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
>>>> [    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
>>>> modes (primary CPU mode 0x13)
>>>> [    3.145327] CPU: This may indicate a broken bootloader or firmware.
>>>> [    3.149347] devtmpfs: initialized
>>>>
>>>
>>> Sigh, such an inconsistent behavior between Exynos5420/5422/5800 boards :-/
>>
>> I put all my hope into Przemyslaw's work :)
>>
>
> Me too :)
>
>>>
>>> Any ideas? I agree that the b.L CPUidle support shouldn't be enabled
>>> by default in exynos_defconfig but as I said nothing prevents the user
>>> to enable that option and make the board to hang on boot.
>>
>> I think these are actually two different issues:
>> 1. If user enables b.L cpuidle manually, some of the Exynos542x boards
>> would work (Peach Pi, AFAIU?) and some would not (Odroid XU3, probably
>
> Yes, Exynos5800 Peach Pi and Exynos5420 Peach Pit IIRC.
>
>> also Arndale Octa). If we cannot fix firmware then we could implement
>> a workaround in Exynos code. However it shouldn't be DTS but rather
>> the mach code.
>
> Agreed about adding a workaround in mach code.
>
>> 2. The default config should be a reference config so it should work
>> on all boards and should offer all necessary features on them (or even
>> all features). Enabling the b.L in it makes sense only if it does not
>> introduce regressions to other boards. If we cannot achieve that
>> (Odroid XU3 will be affected negatively) then still we could fix issue
>> #1 so user's manual setting would work.
>>
>
> Yes but if we achieve #1, then I think that b.L CPUidle support should
> be enabled by default in exynos_defconfig even when it does not work
> on some boards (as long as don't affect negatively) so users of boards
> that do work can have that feature out of the box without figuring out
> what additional config options needs to be enabled.
>
> Or that's what you meant and I misunderstood?

If there won't be negative impact then sure, it could be enabled.
However as we saw above, disabling CCI (which is a fix for cpuidle b.L
on XU3) has negative impact. Of course there could be other
workarounds...

Best regards,
Krzysztof

Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support

[Javier Martinez Canillas]

Hello Krzysztof,

On Sat, Aug 29, 2015 at 12:39 PM, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> 2015-08-29 19:31 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
>> Hello Krzysztof,
>>
>> On Sat, Aug 29, 2015 at 12:22 PM, Krzysztof Kozlowski
>> <k.kozlowski@samsung.com> wrote:
>>> 2015-08-29 19:07 GMT+09:00 Javier Martinez Canillas <javier@dowhile0.org>:
>>>> Hello Krzysztof,
>>>>
>>>> On Sat, Aug 29, 2015 at 11:55 AM, Krzysztof Kozlowski
>>>> <k.kozlowski@samsung.com> wrote:
>>>>> 2015-08-29 18:33 GMT+09:00 Javier Martinez Canillas <javier@osg.samsung.com>:
>>>>>> Hello Krzysztof,
>>>>>>
>>>>>> On 08/29/2015 11:01 AM, Krzysztof Kozlowski wrote:
>>>>>>> W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze:
>>>>>>>> Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based
>>>>>>>> Chromebooks) have proper firmware that allow the big.LITTLE CPUidle
>>>>>>>> driver to work correctly, so enable support for this.
>>>>>>>>
>>>>>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>>>>>>
>>>>>>>> ---
>>>>>>>> Kukjin and Krzysztof,
>>>>>>>>
>>>>>>>> As you know there are other boards like the Exynos5422 based Odroid XU{3,4}
>>>>>>>> whose firmware is broken due leaving CCI in secure mode which means that the
>>>>>>>> kernel MCPM support can't properly manage CCI.
>>>>>>>>
>>>>>>>> So if you pick this patch, it should be tested in kernelci before appearing
>>>>>>>> in linux-next to prevent any boot issues.
>>>>>>>>
>>>>>>>> But if that happens, I believe that is better to do a fix / workaround in
>>>>>>>> those broken platforms since nothing prevents users to enable this option
>>>>>>>> anyways. For example the CCI device node could be disabled in the DTS.
>>>>>>>>
>>>>>>>>  arch/arm/configs/exynos_defconfig | 1 +
>>>>>>>>  1 file changed, 1 insertion(+)
>>>>>>>
>>>>>>> On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
>>>>>>>
>>>>>>
>>>>>> Thanks for testing, I was expecting that is just that I don't have a
>>>>>> Odroid XU{3,4} board for test here, I guess I should get one.
>>>>>>
>>>>>>> [    2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found,
>>>>>>> assuming 1 slot is available
>>>>>>>
>>>>>>> ... so no. NACK :). First the boards, firmware, bootloader or kernel
>>>>>>
>>>>>> Agreed with the nack :)
>>>>>>
>>>>>>> code have to be fixed.
>>>>>>>
>>>>>>
>>>>>> Or disable CCI, could you please test the following patch [0] so I
>>>>>> can post it properly?
>>>>>
>>>>> It fixes the boot hang but causes other issues. Not all CPUs boot (I
>>>>
>>>> Thanks for testing.
>>>>
>>>>> tested it on Chanho Park's patch for fixing CPU boot with SWRESET):
>>>>> [    0.010781] CPU0: update cpu_capacity 448
>>>>> [    0.010839] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
>>>>> [    0.011098] Setting up static identity map for 0x40008280 - 0x400082d8
>>>>> [    0.056329] CPU1: update cpu_capacity 448
>>>>> [    0.056337] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>>>>> [    0.071100] CPU2: update cpu_capacity 448
>>>>> [    0.071107] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>>>>> [    0.086103] CPU3: update cpu_capacity 448
>>>>> [    0.086111] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>>>>> [    0.101100] CPU4: update cpu_capacity 1535
>>>>> [    0.101108] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
>>>>> [    1.115009] CPU5: failed to boot: -110
>>>>> [    2.130019] CPU6: failed to boot: -110
>>>>> [    3.145049] CPU7: failed to boot: -110
>>>>> [    3.145151] Brought up 5 CPUs
>>>>> [    3.145196] SMP: Total of 5 processors activated (240.00 BogoMIPS).
>>>>> [    3.145251] CPU: WARNING: CPU(s) started in wrong/inconsistent
>>>>> modes (primary CPU mode 0x13)
>>>>> [    3.145327] CPU: This may indicate a broken bootloader or firmware.
>>>>> [    3.149347] devtmpfs: initialized
>>>>>
>>>>
>>>> Sigh, such an inconsistent behavior between Exynos5420/5422/5800 boards :-/
>>>
>>> I put all my hope into Przemyslaw's work :)
>>>
>>
>> Me too :)
>>
>>>>
>>>> Any ideas? I agree that the b.L CPUidle support shouldn't be enabled
>>>> by default in exynos_defconfig but as I said nothing prevents the user
>>>> to enable that option and make the board to hang on boot.
>>>
>>> I think these are actually two different issues:
>>> 1. If user enables b.L cpuidle manually, some of the Exynos542x boards
>>> would work (Peach Pi, AFAIU?) and some would not (Odroid XU3, probably
>>
>> Yes, Exynos5800 Peach Pi and Exynos5420 Peach Pit IIRC.
>>
>>> also Arndale Octa). If we cannot fix firmware then we could implement
>>> a workaround in Exynos code. However it shouldn't be DTS but rather
>>> the mach code.
>>
>> Agreed about adding a workaround in mach code.
>>
>>> 2. The default config should be a reference config so it should work
>>> on all boards and should offer all necessary features on them (or even
>>> all features). Enabling the b.L in it makes sense only if it does not
>>> introduce regressions to other boards. If we cannot achieve that
>>> (Odroid XU3 will be affected negatively) then still we could fix issue
>>> #1 so user's manual setting would work.
>>>
>>
>> Yes but if we achieve #1, then I think that b.L CPUidle support should
>> be enabled by default in exynos_defconfig even when it does not work
>> on some boards (as long as don't affect negatively) so users of boards
>> that do work can have that feature out of the box without figuring out
>> what additional config options needs to be enabled.
>>
>> Or that's what you meant and I misunderstood?
>
> If there won't be negative impact then sure, it could be enabled.
> However as we saw above, disabling CCI (which is a fix for cpuidle b.L
> on XU3) has negative impact. Of course there could be other
> workarounds...
>

Yeah, I meant after / if we find a workaround in mach code as you
explained in #1.

> Best regards,
> Krzysztof

Best regards,
Javier