linux-kernel - Re: [Linux-stm32] [BUG] Error applying setting, reverse things back on lot of devices

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Date:   Wed, 4 Nov 2020 11:50:09 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:     <lgirdwood@...il.com>, <mripard@...nel.org>,
        <linux-kernel@...r.kernel.org>, <wens@...e.org>,
        <broonie@...nel.org>, Corentin Labbe <clabbe.montjoie@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linux-stm32] [BUG] Error applying setting, reverse things back
 on lot of devices

Hi Ahmad

On 11/4/20 11:28 AM, Ahmad Fatoum wrote:
> Hello,
> 
> On 11/2/20 9:27 PM, Michał Mirosław wrote:
>> On Mon, Nov 02, 2020 at 01:48:54PM +0100, Ahmad Fatoum wrote:
>>> Hello Michał,
>>>
>>> CC += linux-stm32
>>>
>>> On 10/24/20 1:53 PM, Michał Mirosław wrote:
>>>> On Fri, Oct 23, 2020 at 10:39:43PM +0200, Corentin Labbe wrote:
>>>>> On Fri, Oct 23, 2020 at 03:42:01PM +0200, Corentin Labbe wrote:
>>>>>> On Wed, Oct 21, 2020 at 08:31:49PM +0200, Corentin Labbe wrote:
>>>>>> I have just saw thoses 3 lines which are probably the real problem.
>>>>>> I have started a new bisect with this error, but it is hitting the same "crash range" the first one.
>>>>>>
>>>>>
>>>>> I have bisected the problem to commit aea6cb99703e17019e025aa71643b4d3e0a24413 ("regulator: resolve supply after creating regulator")
>>>>> Reverting this fix my problem.
>>>
>>> The change broke boot on all the STM32MP1 boards, because the STPMIC driver
>>> has a vref_ddr regulator, which does not have a dedicated supply, but without
>>> a vref_ddr-supply property the system now no longer boots.
>> [...]
>>
>> Can you catch debug logs for the bootup in question? I'm not sure what's
>> the failure mode in your case. I guess this is not a bypassed regulator?
> 
> Boot up with v5.10-rc2 + your cf1ad559a2 ("regulator: defer probe when trying
> to get voltage from unresolved supply") hangs:
> 
> [    1.151489] stm32f7-i2c 40015000.i2c: STM32F7 I2C-0 bus adapter
> [    1.180698] stpmic1 1-0033: PMIC Chip Version: 0x10
> [    1.189526] vddcore: supplied by regulator-dummy
> [    1.195633] vdd_ddr: supplied by regulator-dummy
> [    1.201672] vdd: supplied by regulator-dummy
> [    1.207452] v3v3: supplied by 5V2
> [    1.211997] v1v8_audio: supplied by v3v3
> [    1.218036] v3v3_hdmi: supplied by 5V2
> [    1.223626] vtt_ddr: supplied by regulator-dummy
> [    1.227107] vdd_usb: supplied by regulator-dummy
> [    1.234532] vdda: supplied by 5V2
> [    1.239497] v1v2_hdmi: supplied by v3v3
> 
> Boot up with v5.10-rc2 with aea6cb99 ("regulator: resolve supply after
> creating regulator") reverted boots correctly:
> 
> [    1.151458] stm32f7-i2c 40015000.i2c: STM32F7 I2C-0 bus adapter
> [    1.180668] stpmic1 1-0033: PMIC Chip Version: 0x10
> [    1.186629] BUCK1: supplied by regulator-dummy
> [    1.192628] BUCK2: supplied by regulator-dummy
> [    1.198667] BUCK3: supplied by regulator-dummy
> [    1.204623] BUCK4: supplied by 5V2
> [    1.209424] LDO1: supplied by v3v3
> [    1.214931] LDO2: supplied by 5V2
> [    1.219897] LDO3: supplied by regulator-dummy
> [    1.225784] LDO4: supplied by regulator-dummy
> [    1.229239] LDO5: supplied by 5V2
> [    1.235097] LDO6: supplied by v3v3
> [    1.240164] VREF_DDR: supplied by regulator-dummy
> [    1.246130] BOOST: supplied by 5V2
> [    1.248617] VBUS_OTG: supplied by bst_out
> [    1.252698] SW_OUT: supplied by bst_out
> 
> Boot up with v5.10-rc2 + your cf1ad559a2 + &pmic { regulators { vref_ddr-supply = <&reg_5v2>; }

Just to know, Did you test v5.10-rc2 + vref_ddr-supply = <&reg_5v2>; ? 
(which seems to correspond to the patch I sent for DK/EV STM32 boards)

> boots correctly as well:
> 
> [    1.151531] stm32f7-i2c 40015000.i2c: STM32F7 I2C-0 bus adapter
> [    1.180759] stpmic1 1-0033: PMIC Chip Version: 0x10
> [    1.189543] vddcore: supplied by regulator-dummy
> [    1.195651] vdd_ddr: supplied by regulator-dummy
> [    1.201687] vdd: supplied by regulator-dummy
> [    1.207470] v3v3: supplied by 5V2
> [    1.212015] v1v8_audio: supplied by v3v3
> [    1.218053] v3v3_hdmi: supplied by 5V2
> [    1.223647] vtt_ddr: supplied by regulator-dummy
> [    1.227128] vdd_usb: supplied by regulator-dummy
> [    1.234553] vdda: supplied by 5V2
> [    1.239510] v1v2_hdmi: supplied by v3v3
> [    1.244932] vref_ddr: supplied by 5V2
> [    1.247397] bst_out: supplied by 5V2
> [    1.251338] vbus_otg: supplied by bst_out
> [    1.255416] vbus_sw: supplied by bst_out
> 
> 
> Cheers
> Ahmad
> 
>>
>> Best Regards,
>> Michał Mirosław
>>
>>
>