[PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Gregory CLEMENT]

The clock parenting was not setup properly when DVFS was enabled. It was
expected that the same clock source was used with and without DVFS which
was not the case.

This patch fixes this issue, allowing to make the cpufreq support work
when the CPU clocks source are not the default ones.

Fixes: 92ce45fb875d ("cpufreq: Add DVFS support for Armada 37xx")
Cc: <stable@vger.kernel.org>
Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
 drivers/clk/mvebu/armada-37xx-periph.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
index 1f1cff428d78..26ed3c18a239 100644
--- a/drivers/clk/mvebu/armada-37xx-periph.c
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -671,6 +671,17 @@ static int armada_3700_add_composite_clk(const struct clk_periph_data *data,
 		map = syscon_regmap_lookup_by_compatible(
 				"marvell,armada-3700-nb-pm");
 		pmcpu_clk->nb_pm_base = map;
+
+		/*
+		 * Use the same parent when DVFS is enabled that the
+		 * default parent received at boot time. When this
+		 * function is called, DVFS is not enabled yet, so we
+		 * get the default parent and we can set the parent
+		 * for DVFS.
+		 */
+		if (clk_pm_cpu_set_parent(muxrate_hw,
+					  clk_pm_cpu_get_parent(muxrate_hw)))
+			dev_warn(dev, "Failed to setup default parent clock for DVFS\n");
 	}
 
 	*hw = clk_hw_register_composite(dev, data->name, data->parent_names,
-- 
2.20.1

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi Gregory, 
> The clock parenting was not setup properly when DVFS was enabled. It was
> expected that the same clock source was used with and without DVFS which
> was not the case.
> 
> This patch fixes this issue, allowing to make the cpufreq support work
> when the CPU clocks source are not the default ones.
> 
> Fixes: 92ce45fb875d ("cpufreq: Add DVFS support for Armada 37xx")
> Cc: <stable@vger.kernel.org>
> Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
> Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> ---
>  drivers/clk/mvebu/armada-37xx-periph.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
> index 1f1cff428d78..26ed3c18a239 100644
> --- a/drivers/clk/mvebu/armada-37xx-periph.c
> +++ b/drivers/clk/mvebu/armada-37xx-periph.c
> @@ -671,6 +671,17 @@ static int armada_3700_add_composite_clk(const struct clk_periph_data *data,
>  		map = syscon_regmap_lookup_by_compatible(
>  				"marvell,armada-3700-nb-pm");
>  		pmcpu_clk->nb_pm_base = map;
> +
> +		/*
> +		 * Use the same parent when DVFS is enabled that the
> +		 * default parent received at boot time. When this
> +		 * function is called, DVFS is not enabled yet, so we
> +		 * get the default parent and we can set the parent
> +		 * for DVFS.
> +		 */
> +		if (clk_pm_cpu_set_parent(muxrate_hw,
> +					  clk_pm_cpu_get_parent(muxrate_hw)))
> +			dev_warn(dev, "Failed to setup default parent clock for DVFS\n");
>  	}
>  
>  	*hw = clk_hw_register_composite(dev, data->name, data->parent_names,
> -- 
> 2.20.1
> 
Applied this and selected only

CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y

After changing the governor from 'powersave' to 'performance' the board
completely froze (i even lost access to the serial port)

Cheers
/Ilias

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hello Christian,
> Hi,
> 
> I assume you use the 1000 MHz firmware. This does also not work on my Rev 7
> board. But I'm pretty sure this is not a problem of the patches, because if
> I take a newer kernel (4.19.20/27) without the patches it also does not
> work. A kernel 4.19.17 does work for me. My opinion on that is that this is
> another problem which does just occure now because now the cpu frequency
> scaling is working with the right frequencies.
I am not sure which firmware i am running, i did all my tests on 5.0.0 and
changing between governors worked fine without the patches

Regards
/Ilias
> 
> Ilias Apalodimas <ilias.apalodimas@linaro.org> schrieb am Do., 14. März
> 2019, 13:15:
> 
> > Hi Gregory,
> > > The clock parenting was not setup properly when DVFS was enabled. It was
> > > expected that the same clock source was used with and without DVFS which
> > > was not the case.
> > >
> > > This patch fixes this issue, allowing to make the cpufreq support work
> > > when the CPU clocks source are not the default ones.
> > >
> > > Fixes: 92ce45fb875d ("cpufreq: Add DVFS support for Armada 37xx")
> > > Cc: <stable@vger.kernel.org>
> > > Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
> > > Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> > > Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> > > ---
> > >  drivers/clk/mvebu/armada-37xx-periph.c | 11 +++++++++++
> > >  1 file changed, 11 insertions(+)
> > >
> > > diff --git a/drivers/clk/mvebu/armada-37xx-periph.c
> > b/drivers/clk/mvebu/armada-37xx-periph.c
> > > index 1f1cff428d78..26ed3c18a239 100644
> > > --- a/drivers/clk/mvebu/armada-37xx-periph.c
> > > +++ b/drivers/clk/mvebu/armada-37xx-periph.c
> > > @@ -671,6 +671,17 @@ static int armada_3700_add_composite_clk(const
> > struct clk_periph_data *data,
> > >               map = syscon_regmap_lookup_by_compatible(
> > >                               "marvell,armada-3700-nb-pm");
> > >               pmcpu_clk->nb_pm_base = map;
> > > +
> > > +             /*
> > > +              * Use the same parent when DVFS is enabled that the
> > > +              * default parent received at boot time. When this
> > > +              * function is called, DVFS is not enabled yet, so we
> > > +              * get the default parent and we can set the parent
> > > +              * for DVFS.
> > > +              */
> > > +             if (clk_pm_cpu_set_parent(muxrate_hw,
> > > +
> >  clk_pm_cpu_get_parent(muxrate_hw)))
> > > +                     dev_warn(dev, "Failed to setup default parent
> > clock for DVFS\n");
> > >       }
> > >
> > >       *hw = clk_hw_register_composite(dev, data->name,
> > data->parent_names,
> > > --
> > > 2.20.1
> > >
> > Applied this and selected only
> >
> > CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> > CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> > CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> >
> > After changing the governor from 'powersave' to 'performance' the board
> > completely froze (i even lost access to the serial port)
> >
> > Cheers
> > /Ilias
> >

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi,
> Hi,
> 
> the cpu frequency scaling never worked right (only on the 4.4 kernel from
> marvell). If you use the 1000 MHz firmware you are running with just 800
> MHz (this is the case on my board with a current firmware).
>
> Just have a look what the kernel thinks it is running at (frequency).
Ok, probably my bad here. By 'worked fine' i mean that this didn't lead to any 
freezes or panics. I know the actual frequency wasn't set properly

Regards
/Ilias
> 
> Regards,
> Christian
> 
> Ilias Apalodimas <ilias.apalodimas@linaro.org> schrieb am Do., 14. März
> 2019, 14:44:
> 
> > Hello Christian,
> > > Hi,
> > >
> > > I assume you use the 1000 MHz firmware. This does also not work on my
> > Rev 7
> > > board. But I'm pretty sure this is not a problem of the patches, because
> > if
> > > I take a newer kernel (4.19.20/27) without the patches it also does not
> > > work. A kernel 4.19.17 does work for me. My opinion on that is that this
> > is
> > > another problem which does just occure now because now the cpu frequency
> > > scaling is working with the right frequencies.
> > I am not sure which firmware i am running, i did all my tests on 5.0.0 and
> > changing between governors worked fine without the patches
> >
> > Regards
> > /Ilias
> > >
> > > Ilias Apalodimas <ilias.apalodimas@linaro.org> schrieb am Do., 14. März
> > > 2019, 13:15:
> > >
> > > > Hi Gregory,
> > > > > The clock parenting was not setup properly when DVFS was enabled. It
> > was
> > > > > expected that the same clock source was used with and without DVFS
> > which
> > > > > was not the case.
> > > > >
> > > > > This patch fixes this issue, allowing to make the cpufreq support
> > work
> > > > > when the CPU clocks source are not the default ones.
> > > > >
> > > > > Fixes: 92ce45fb875d ("cpufreq: Add DVFS support for Armada 37xx")
> > > > > Cc: <stable@vger.kernel.org>
> > > > > Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
> > > > > Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> > > > > Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> > > > > ---
> > > > >  drivers/clk/mvebu/armada-37xx-periph.c | 11 +++++++++++
> > > > >  1 file changed, 11 insertions(+)
> > > > >
> > > > > diff --git a/drivers/clk/mvebu/armada-37xx-periph.c
> > > > b/drivers/clk/mvebu/armada-37xx-periph.c
> > > > > index 1f1cff428d78..26ed3c18a239 100644
> > > > > --- a/drivers/clk/mvebu/armada-37xx-periph.c
> > > > > +++ b/drivers/clk/mvebu/armada-37xx-periph.c
> > > > > @@ -671,6 +671,17 @@ static int armada_3700_add_composite_clk(const
> > > > struct clk_periph_data *data,
> > > > >               map = syscon_regmap_lookup_by_compatible(
> > > > >                               "marvell,armada-3700-nb-pm");
> > > > >               pmcpu_clk->nb_pm_base = map;
> > > > > +
> > > > > +             /*
> > > > > +              * Use the same parent when DVFS is enabled that the
> > > > > +              * default parent received at boot time. When this
> > > > > +              * function is called, DVFS is not enabled yet, so we
> > > > > +              * get the default parent and we can set the parent
> > > > > +              * for DVFS.
> > > > > +              */
> > > > > +             if (clk_pm_cpu_set_parent(muxrate_hw,
> > > > > +
> > > >  clk_pm_cpu_get_parent(muxrate_hw)))
> > > > > +                     dev_warn(dev, "Failed to setup default parent
> > > > clock for DVFS\n");
> > > > >       }
> > > > >
> > > > >       *hw = clk_hw_register_composite(dev, data->name,
> > > > data->parent_names,
> > > > > --
> > > > > 2.20.1
> > > > >
> > > > Applied this and selected only
> > > >
> > > > CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> > > > CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> > > > CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> > > >
> > > > After changing the governor from 'powersave' to 'performance' the board
> > > > completely froze (i even lost access to the serial port)
> > > >
> > > > Cheers
> > > > /Ilias
> > > >
> >

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Gregory CLEMENT]

Hi Ilias,
 
 On jeu., mars 14 2019, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:

> Hello Christian,
>> Hi,
>> 
>> I assume you use the 1000 MHz firmware. This does also not work on my Rev 7
>> board. But I'm pretty sure this is not a problem of the patches, because if
>> I take a newer kernel (4.19.20/27) without the patches it also does not
>> work. A kernel 4.19.17 does work for me. My opinion on that is that this is
>> another problem which does just occure now because now the cpu frequency
>> scaling is working with the right frequencies.
> I am not sure which firmware i am running, i did all my tests on 5.0.0 and
> changing between governors worked fine without the patches

Curently my espressobin is broken so I tested the patches on the Armada
3700 DB and I didn't observe the issue you had.

The 3700 DB I used is configured to run at 800MHz.

Could you apply the following patch and sent me the boot log?

diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
index 26ed3c18a239..f814ade5cd80 100644
--- a/drivers/clk/mvebu/armada-37xx-periph.c
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -452,14 +452,17 @@ static int clk_pm_cpu_set_parent(struct clk_hw *hw, u8 index)
 
        /* Set the parent clock for all the load level */
        for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
-               unsigned int reg, mask,  val,
+               unsigned int reg, mask,  val, old,
                        offset = ARMADA_37XX_NB_TBG_SEL_OFF;
 
                armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
 
                val = index << offset;
                mask = ARMADA_37XX_NB_TBG_SEL_MASK << offset;
+               regmap_read(base, reg, &old);
                regmap_update_bits(base, reg, mask, val);
+               pr_err("%s old=%X -> val=0x%X load_level=%d\n",
+                      __func__, old,  val, load_level);
        }
        return 0;
 }



>
> Regards
> /Ilias
>> 
>> Ilias Apalodimas <ilias.apalodimas@linaro.org> schrieb am Do., 14. März
>> 2019, 13:15:
>> 
>> > Hi Gregory,
>> > > The clock parenting was not setup properly when DVFS was enabled. It was
>> > > expected that the same clock source was used with and without DVFS which
>> > > was not the case.
>> > >
>> > > This patch fixes this issue, allowing to make the cpufreq support work
>> > > when the CPU clocks source are not the default ones.
>> > >
>> > > Fixes: 92ce45fb875d ("cpufreq: Add DVFS support for Armada 37xx")
>> > > Cc: <stable@vger.kernel.org>
>> > > Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
>> > > Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
>> > > Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
>> > > ---
>> > >  drivers/clk/mvebu/armada-37xx-periph.c | 11 +++++++++++
>> > >  1 file changed, 11 insertions(+)
>> > >
>> > > diff --git a/drivers/clk/mvebu/armada-37xx-periph.c
>> > b/drivers/clk/mvebu/armada-37xx-periph.c
>> > > index 1f1cff428d78..26ed3c18a239 100644
>> > > --- a/drivers/clk/mvebu/armada-37xx-periph.c
>> > > +++ b/drivers/clk/mvebu/armada-37xx-periph.c
>> > > @@ -671,6 +671,17 @@ static int armada_3700_add_composite_clk(const
>> > struct clk_periph_data *data,
>> > >               map = syscon_regmap_lookup_by_compatible(
>> > >                               "marvell,armada-3700-nb-pm");
>> > >               pmcpu_clk->nb_pm_base = map;
>> > > +
>> > > +             /*
>> > > +              * Use the same parent when DVFS is enabled that the
>> > > +              * default parent received at boot time. When this
>> > > +              * function is called, DVFS is not enabled yet, so we
>> > > +              * get the default parent and we can set the parent
>> > > +              * for DVFS.
>> > > +              */
>> > > +             if (clk_pm_cpu_set_parent(muxrate_hw,
>> > > +
>> >  clk_pm_cpu_get_parent(muxrate_hw)))
>> > > +                     dev_warn(dev, "Failed to setup default parent
>> > clock for DVFS\n");
>> > >       }
>> > >
>> > >       *hw = clk_hw_register_composite(dev, data->name,
>> > data->parent_names,
>> > > --
>> > > 2.20.1
>> > >
>> > Applied this and selected only
>> >
>> > CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
>> > CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
>> > CONFIG_CPU_FREQ_GOV_POWERSAVE=y
>> >
>> > After changing the governor from 'powersave' to 'performance' the board
>> > completely froze (i even lost access to the serial port)
>> >
>> > Cheers
>> > /Ilias
>> >

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi Gregory, 
> Hi Ilias,
>  
>  On jeu., mars 14 2019, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:
> 
> > Hello Christian,
> >> Hi,
> >> 
> >> I assume you use the 1000 MHz firmware. This does also not work on my Rev 7
> >> board. But I'm pretty sure this is not a problem of the patches, because if
> >> I take a newer kernel (4.19.20/27) without the patches it also does not
> >> work. A kernel 4.19.17 does work for me. My opinion on that is that this is
> >> another problem which does just occure now because now the cpu frequency
> >> scaling is working with the right frequencies.
> > I am not sure which firmware i am running, i did all my tests on 5.0.0 and
> > changing between governors worked fine without the patches
> 
> Curently my espressobin is broken so I tested the patches on the Armada
> 3700 DB and I didn't observe the issue you had.
> 
> The 3700 DB I used is configured to run at 800MHz.
> 
> Could you apply the following patch and sent me the boot log?
> 
> diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
> index 26ed3c18a239..f814ade5cd80 100644
> --- a/drivers/clk/mvebu/armada-37xx-periph.c
> +++ b/drivers/clk/mvebu/armada-37xx-periph.c
> @@ -452,14 +452,17 @@ static int clk_pm_cpu_set_parent(struct clk_hw *hw, u8 index)
>  
>         /* Set the parent clock for all the load level */
>         for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
> -               unsigned int reg, mask,  val,
> +               unsigned int reg, mask,  val, old,
>                         offset = ARMADA_37XX_NB_TBG_SEL_OFF;
>  
>                 armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
>  
>                 val = index << offset;
>                 mask = ARMADA_37XX_NB_TBG_SEL_MASK << offset;
> +               regmap_read(base, reg, &old);
>                 regmap_update_bits(base, reg, mask, val);
> +               pr_err("%s old=%X -> val=0x%X load_level=%d\n",
> +                      __func__, old,  val, load_level);
>         }
>         return 0;
>  }
> 
> 
> 
[   14.909524] clk_pm_cpu_set_parent old=28004840 -> val=0x6000000 load_level=0
[   14.916424] clk_pm_cpu_set_parent old=2E004840 -> val=0x600 load_level=1
[   14.923315] clk_pm_cpu_set_parent old=8880A8C0 -> val=0x6000000 load_level=2
[   14.930572] clk_pm_cpu_set_parent old=8E80A8C0 -> val=0x600 load_level=3


Let me know if you need anything else

Regards
/Ilias

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Gregory CLEMENT]

Hi Ilias,
 
 On lun., mars 18 2019, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:

> Hi Gregory, 
>> Hi Ilias,
>>  
>>  On jeu., mars 14 2019, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:
>> 
>> > Hello Christian,
>> >> Hi,
>> >> 
>> >> I assume you use the 1000 MHz firmware. This does also not work on my Rev 7
>> >> board. But I'm pretty sure this is not a problem of the patches, because if
>> >> I take a newer kernel (4.19.20/27) without the patches it also does not
>> >> work. A kernel 4.19.17 does work for me. My opinion on that is that this is
>> >> another problem which does just occure now because now the cpu frequency
>> >> scaling is working with the right frequencies.
>> > I am not sure which firmware i am running, i did all my tests on 5.0.0 and
>> > changing between governors worked fine without the patches
>> 
>> Curently my espressobin is broken so I tested the patches on the Armada
>> 3700 DB and I didn't observe the issue you had.
>> 
>> The 3700 DB I used is configured to run at 800MHz.
>> 
>> Could you apply the following patch and sent me the boot log?
>> 
>> diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
>> index 26ed3c18a239..f814ade5cd80 100644
>> --- a/drivers/clk/mvebu/armada-37xx-periph.c
>> +++ b/drivers/clk/mvebu/armada-37xx-periph.c
>> @@ -452,14 +452,17 @@ static int clk_pm_cpu_set_parent(struct clk_hw *hw, u8 index)
>>  
>>         /* Set the parent clock for all the load level */
>>         for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
>> -               unsigned int reg, mask,  val,
>> +               unsigned int reg, mask,  val, old,
>>                         offset = ARMADA_37XX_NB_TBG_SEL_OFF;
>>  
>>                 armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
>>  
>>                 val = index << offset;
>>                 mask = ARMADA_37XX_NB_TBG_SEL_MASK << offset;
>> +               regmap_read(base, reg, &old);
>>                 regmap_update_bits(base, reg, mask, val);
>> +               pr_err("%s old=%X -> val=0x%X load_level=%d\n",
>> +                      __func__, old,  val, load_level);
>>         }
>>         return 0;
>>  }
>> 
>> 
>> 
> [   14.909524] clk_pm_cpu_set_parent old=28004840 -> val=0x6000000 load_level=0
> [   14.916424] clk_pm_cpu_set_parent old=2E004840 -> val=0x600 load_level=1
> [   14.923315] clk_pm_cpu_set_parent old=8880A8C0 -> val=0x6000000 load_level=2
> [   14.930572] clk_pm_cpu_set_parent old=8E80A8C0 -> val=0x600 load_level=3
>
>
> Let me know if you need anything else

Could you show me the output of "cat /sys/kernel/debug/clk/clk_summary"

Also, during this week-end, Christian suggested that the issue might
come from the AVS support.

Could you disable it and check you still have the issue?

For this, you just have to remove the avs node in
arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.

Thanks,

Gregory

>
> Regards
> /Ilias

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi Gregory, 

> >> 
> > [   14.909524] clk_pm_cpu_set_parent old=28004840 -> val=0x6000000 load_level=0
> > [   14.916424] clk_pm_cpu_set_parent old=2E004840 -> val=0x600 load_level=1
> > [   14.923315] clk_pm_cpu_set_parent old=8880A8C0 -> val=0x6000000 load_level=2
> > [   14.930572] clk_pm_cpu_set_parent old=8E80A8C0 -> val=0x600 load_level=3
> >
> >
> > Let me know if you need anything else
> 
> Could you show me the output of "cat /sys/kernel/debug/clk/clk_summary"
> 
root@localhost ~ # cat /sys/kernel/debug/clk/clk_summary
                                 enable  prepare  protect                                duty
   clock                          count    count    count        rate   accuracy phase  cycle
---------------------------------------------------------------------------------------------
 xtal                                 2        3        0    25000000          0     0  50000
    i2c_1                             0        0        0    25000000          0     0  50000
    i2c_2                             0        0        0    25000000          0     0  50000
    avs                               0        0        0    25000000          0     0  50000
    TBG-B-S                           2        2        0  1000000000          0     0  50000
       cpu                            0        0        0   200000000          0     0  50000
       usb32_ss_sys                   1        1        0   125000000          0     0  50000
       usb32_usb2_sys                 0        0        0   100000000          0     0  50000
       gbe_125                        0        0        0   125000000          0     0  50000
          gbe0_125                    0        0        0   125000000          0     0  50000
          gbe1_125                    0        0        0   125000000          0     0  50000
       gbe_core                       1        1        0   250000000          0     0  50000
          gbe_bm                      0        0        0   250000000          0     0  50000
          gbe0_core                   1        1        0   250000000          0     0  50000
          gbe1_core                   0        0        0   250000000          0     0  50000
       eip97                          0        0        0   500000000          0     0  50000
       trace                          0        0        0  1000000000          0     0  50000
       ddr_fclk                       0        0        0   125000000          0     0  50000
       pwm                            0        0        0    50000000          0     0  50000
       tscem_tmx                      0        0        0  1000000000          0     0  50000
       sec_dap                        0        0        0   100000000          0     0  50000
       sec_at                         0        0        0   200000000          0     0  50000
    TBG-A-S                           0        0        0  1600000000          0     0  50000
       sdio                           0        0        0   400000000          0     0  50000
       ddr_phy                        0        0        0   400000000          0     0  50000
       mmc                            0        0        0   400000000          0     0  50000
    TBG-B-P                           0        0        0   500000000          0     0  50000
       gbe_50                         0        0        0    50000000          0     0  50000
          gbe0_50                     0        0        0    50000000          0     0  50000
          gbe1_50                     0        0        0    50000000          0     0  50000
    TBG-A-P                           0        1        0   800000000          0     0  50000
       counter                        0        0        0   160000000          0     0  50000
       sqf                            0        1        0   200000000          0     0  50000
       tscem                          0        0        0   200000000          0     0  50000
       sata_host                      0        0        0   200000000          0     0  50000
root@localhost ~ # 

> Also, during this week-end, Christian suggested that the issue might
> come from the AVS support.
> 
> Could you disable it and check you still have the issue?
> 
> For this, you just have to remove the avs node in
> arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
 once i return


Cheers
/Ilias

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Viresh Kumar]

On 18-03-19, 14:21, Ilias Apalodimas wrote:
> Hi Gregory, 
> 
> > >> 
> > > [   14.909524] clk_pm_cpu_set_parent old=28004840 -> val=0x6000000 load_level=0
> > > [   14.916424] clk_pm_cpu_set_parent old=2E004840 -> val=0x600 load_level=1
> > > [   14.923315] clk_pm_cpu_set_parent old=8880A8C0 -> val=0x6000000 load_level=2
> > > [   14.930572] clk_pm_cpu_set_parent old=8E80A8C0 -> val=0x600 load_level=3
> > >
> > >
> > > Let me know if you need anything else
> > 
> > Could you show me the output of "cat /sys/kernel/debug/clk/clk_summary"
> > 
> root@localhost ~ # cat /sys/kernel/debug/clk/clk_summary
>                                  enable  prepare  protect                                duty
>    clock                          count    count    count        rate   accuracy phase  cycle
> ---------------------------------------------------------------------------------------------
>  xtal                                 2        3        0    25000000          0     0  50000
>     i2c_1                             0        0        0    25000000          0     0  50000
>     i2c_2                             0        0        0    25000000          0     0  50000
>     avs                               0        0        0    25000000          0     0  50000
>     TBG-B-S                           2        2        0  1000000000          0     0  50000
>        cpu                            0        0        0   200000000          0     0  50000
>        usb32_ss_sys                   1        1        0   125000000          0     0  50000
>        usb32_usb2_sys                 0        0        0   100000000          0     0  50000
>        gbe_125                        0        0        0   125000000          0     0  50000
>           gbe0_125                    0        0        0   125000000          0     0  50000
>           gbe1_125                    0        0        0   125000000          0     0  50000
>        gbe_core                       1        1        0   250000000          0     0  50000
>           gbe_bm                      0        0        0   250000000          0     0  50000
>           gbe0_core                   1        1        0   250000000          0     0  50000
>           gbe1_core                   0        0        0   250000000          0     0  50000
>        eip97                          0        0        0   500000000          0     0  50000
>        trace                          0        0        0  1000000000          0     0  50000
>        ddr_fclk                       0        0        0   125000000          0     0  50000
>        pwm                            0        0        0    50000000          0     0  50000
>        tscem_tmx                      0        0        0  1000000000          0     0  50000
>        sec_dap                        0        0        0   100000000          0     0  50000
>        sec_at                         0        0        0   200000000          0     0  50000
>     TBG-A-S                           0        0        0  1600000000          0     0  50000
>        sdio                           0        0        0   400000000          0     0  50000
>        ddr_phy                        0        0        0   400000000          0     0  50000
>        mmc                            0        0        0   400000000          0     0  50000
>     TBG-B-P                           0        0        0   500000000          0     0  50000
>        gbe_50                         0        0        0    50000000          0     0  50000
>           gbe0_50                     0        0        0    50000000          0     0  50000
>           gbe1_50                     0        0        0    50000000          0     0  50000
>     TBG-A-P                           0        1        0   800000000          0     0  50000
>        counter                        0        0        0   160000000          0     0  50000
>        sqf                            0        1        0   200000000          0     0  50000
>        tscem                          0        0        0   200000000          0     0  50000
>        sata_host                      0        0        0   200000000          0     0  50000
> root@localhost ~ # 
> 
> > Also, during this week-end, Christian suggested that the issue might
> > come from the AVS support.
> > 
> > Could you disable it and check you still have the issue?
> > 
> > For this, you just have to remove the avs node in
> > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
>  once i return

@Ilias: Can you please try this now and confirm to Gregory ?

-- 
viresh

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi Viresh,

> > > Also, during this week-end, Christian suggested that the issue might
> > > come from the AVS support.
> > > 
> > > Could you disable it and check you still have the issue?
> > > 
> > > For this, you just have to remove the avs node in
> > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> >  once i return
> 
> @Ilias: Can you please try this now and confirm to Gregory ?
I am more overloaded than usual and totally forgot about this. Apologies.
I'll try finding some time and do this.

Thanks
/Ilias

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Viresh Kumar]

On 25-04-19, 15:33, Ilias Apalodimas wrote:
> Hi Viresh,
> 
> > > > Also, during this week-end, Christian suggested that the issue might
> > > > come from the AVS support.
> > > > 
> > > > Could you disable it and check you still have the issue?
> > > > 
> > > > For this, you just have to remove the avs node in
> > > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> > >  once i return
> > 
> > @Ilias: Can you please try this now and confirm to Gregory ?
> I am more overloaded than usual and totally forgot about this. Apologies.
> I'll try finding some time and do this.

Ping Ilias.

-- 
viresh

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Ilias Apalodimas]

Hi Viresh, Gregory
On Mon, May 20, 2019 at 04:50:42PM +0530, Viresh Kumar wrote:
> On 25-04-19, 15:33, Ilias Apalodimas wrote:
> > Hi Viresh,
> > 
> > > > > Also, during this week-end, Christian suggested that the issue might
> > > > > come from the AVS support.
> > > > > 
> > > > > Could you disable it and check you still have the issue?
> > > > > 
> > > > > For this, you just have to remove the avs node in
> > > > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > > > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> > > >  once i return
> > > 
> > > @Ilias: Can you please try this now and confirm to Gregory ?
> > I am more overloaded than usual and totally forgot about this. Apologies.
> > I'll try finding some time and do this.
> 
> Ping Ilias.
Sorry for the huge delay. 
Applying this patch and removing tha 'avs' node from
arch/arm64/boot/dts/marvell/armada-37xx.dtsi seems to work.
Changing between governors does not freeze the board any more. I haven't checked
the actual impact on the CPU speed but the values on 
/sys/devices/system/cpu/cpufreq/policy0/scaling_governor are correct

Cheers
/Ilias

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Viresh Kumar]

On 22-05-19, 10:03, Ilias Apalodimas wrote:
> Hi Viresh, Gregory
> On Mon, May 20, 2019 at 04:50:42PM +0530, Viresh Kumar wrote:
> > On 25-04-19, 15:33, Ilias Apalodimas wrote:
> > > Hi Viresh,
> > > 
> > > > > > Also, during this week-end, Christian suggested that the issue might
> > > > > > come from the AVS support.
> > > > > > 
> > > > > > Could you disable it and check you still have the issue?
> > > > > > 
> > > > > > For this, you just have to remove the avs node in
> > > > > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > > > > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> > > > >  once i return
> > > > 
> > > > @Ilias: Can you please try this now and confirm to Gregory ?
> > > I am more overloaded than usual and totally forgot about this. Apologies.
> > > I'll try finding some time and do this.
> > 
> > Ping Ilias.
> Sorry for the huge delay. 
> Applying this patch and removing tha 'avs' node from
> arch/arm64/boot/dts/marvell/armada-37xx.dtsi seems to work.
> Changing between governors does not freeze the board any more. I haven't checked
> the actual impact on the CPU speed but the values on 
> /sys/devices/system/cpu/cpufreq/policy0/scaling_governor are correct

Thanks for testing it out. Lets see what Gregory has to say now.

-- 
viresh

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Viresh Kumar]

On 22-05-19, 12:36, Viresh Kumar wrote:
> On 22-05-19, 10:03, Ilias Apalodimas wrote:
> > Hi Viresh, Gregory
> > On Mon, May 20, 2019 at 04:50:42PM +0530, Viresh Kumar wrote:
> > > On 25-04-19, 15:33, Ilias Apalodimas wrote:
> > > > Hi Viresh,
> > > > 
> > > > > > > Also, during this week-end, Christian suggested that the issue might
> > > > > > > come from the AVS support.
> > > > > > > 
> > > > > > > Could you disable it and check you still have the issue?
> > > > > > > 
> > > > > > > For this, you just have to remove the avs node in
> > > > > > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > > > > > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> > > > > >  once i return
> > > > > 
> > > > > @Ilias: Can you please try this now and confirm to Gregory ?
> > > > I am more overloaded than usual and totally forgot about this. Apologies.
> > > > I'll try finding some time and do this.
> > > 
> > > Ping Ilias.
> > Sorry for the huge delay. 
> > Applying this patch and removing tha 'avs' node from
> > arch/arm64/boot/dts/marvell/armada-37xx.dtsi seems to work.
> > Changing between governors does not freeze the board any more. I haven't checked
> > the actual impact on the CPU speed but the values on 
> > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor are correct
> 
> Thanks for testing it out. Lets see what Gregory has to say now.

@Gregory: Do you have any further advice for Ilias ?

-- 
viresh

Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

[Viresh Kumar]

On 10-06-19, 15:49, Viresh Kumar wrote:
> On 22-05-19, 12:36, Viresh Kumar wrote:
> > On 22-05-19, 10:03, Ilias Apalodimas wrote:
> > > Hi Viresh, Gregory
> > > On Mon, May 20, 2019 at 04:50:42PM +0530, Viresh Kumar wrote:
> > > > On 25-04-19, 15:33, Ilias Apalodimas wrote:
> > > > > Hi Viresh,
> > > > > 
> > > > > > > > Also, during this week-end, Christian suggested that the issue might
> > > > > > > > come from the AVS support.
> > > > > > > > 
> > > > > > > > Could you disable it and check you still have the issue?
> > > > > > > > 
> > > > > > > > For this, you just have to remove the avs node in
> > > > > > > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi and rebuild the dtb.
> > > > > > > Sure. You'll have to wait for a week though. Currently on a trip. I'll run that
> > > > > > >  once i return
> > > > > > 
> > > > > > @Ilias: Can you please try this now and confirm to Gregory ?
> > > > > I am more overloaded than usual and totally forgot about this. Apologies.
> > > > > I'll try finding some time and do this.
> > > > 
> > > > Ping Ilias.
> > > Sorry for the huge delay. 
> > > Applying this patch and removing tha 'avs' node from
> > > arch/arm64/boot/dts/marvell/armada-37xx.dtsi seems to work.
> > > Changing between governors does not freeze the board any more. I haven't checked
> > > the actual impact on the CPU speed but the values on 
> > > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor are correct
> > 
> > Thanks for testing it out. Lets see what Gregory has to say now.
> 
> @Gregory: Do you have any further advice for Ilias ?

Ping.

-- 
viresh