linux-kernel - Re: (subset) [PATCH v12 0/9] Add STM32MP25 PCIe drivers

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Message-ID: <01dbb6cf-3ab4-4922-b301-661464c9e56d@foss.st.com>
Date: Wed, 25 Jun 2025 12:18:16 +0200
From: Christian Bruel <christian.bruel@...s.st.com>
To: Manivannan Sadhasivam <mani@...nel.org>,
        Bjorn Helgaas
	<helgaas@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
CC: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <robh@...nel.org>,
        <bhelgaas@...gle.com>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...s.st.com>,
        <p.zabel@...gutronix.de>, <johan+linaro@...nel.org>,
        <cassel@...nel.org>, <shradha.t@...sung.com>,
        <thippeswamy.havalige@....com>, <quic_schintav@...cinc.com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: (subset) [PATCH v12 0/9] Add STM32MP25 PCIe drivers



On 6/25/25 06:00, Manivannan Sadhasivam wrote:
> On Tue, Jun 24, 2025 at 05:22:06PM -0500, Bjorn Helgaas wrote:
>> On Mon, Jun 23, 2025 at 06:13:07AM -0600, Manivannan Sadhasivam wrote:
>>> On Tue, 10 Jun 2025 11:07:05 +0200, Christian Bruel wrote:
>>>> Changes in v12;
>>>>     Fix warning reported by kernel test robot <lkp@...el.com>
>>>>
>>>> Changes in v11;
>>>>     Address comments from Manivanna:
>>>>     - RC driver: Do not call pm_runtime_get_noresume in probe
>>>>                  More uses of dev_err_probe
>>>>     - EP driver: Use level triggered PERST# irq
>>>>
>>>> [...]
>>>
>>> Applied, thanks!
>>>
>>> [1/9] dt-bindings: PCI: Add STM32MP25 PCIe Root Complex bindings
>>>        commit: 41d5cfbdda7a61c5d646a54035b697205cff1cf0
>>> [2/9] PCI: stm32: Add PCIe host support for STM32MP25
>>>        commit: f6111bc2d8fe6ffc741661126a2174523124dc11
>>> [3/9] dt-bindings: PCI: Add STM32MP25 PCIe Endpoint bindings
>>>        commit: 203cfc4a23506ffb9c48d1300348c290dbf9368e
>>> [4/9] PCI: stm32: Add PCIe Endpoint support for STM32MP25
>>>        commit: 8869fb36a107a9ff18dab8c224de6afff1e81dec
>>> [5/9] MAINTAINERS: add entry for ST STM32MP25 PCIe drivers
>>>        commit: 003902ed7778d62083120253cd282a9112674986
>>
>> This doesn't build for me with the attached config:
>>
>>    $ make drivers/pci/controller/dwc/pcie-stm32.o
>>      CALL    scripts/checksyscalls.sh
>>      DESCEND objtool
>>      INSTALL libsubcmd_headers
>>      CC      drivers/pci/controller/dwc/pcie-stm32.o
>>    drivers/pci/controller/dwc/pcie-stm32.c: In function ‘stm32_pcie_suspend_noirq’:
>>    drivers/pci/controller/dwc/pcie-stm32.c:83:16: error: implicit declaration of function ‘pinctrl_pm_select_sleep_state’ [-Werror=implicit-function-declaration]
>>       83 |         return pinctrl_pm_select_sleep_state(dev);
>> 	|                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    drivers/pci/controller/dwc/pcie-stm32.c: In function ‘stm32_pcie_resume_noirq’:
>>    drivers/pci/controller/dwc/pcie-stm32.c:96:24: error: ‘structdevice’ has no member named ‘pins’
>>       96 |         if (!IS_ERR(dev->pins->init_state))
>> 	|                        ^~
>>    drivers/pci/controller/dwc/pcie-stm32.c:97:23: error: implicit declaration of function ‘pinctrl_select_state’ [-Werror=implicit-function-declaration]
>>       97 |                 ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
>> 	|                       ^~~~~~~~~~~~~~~~~~~~
>>    drivers/pci/controller/dwc/pcie-stm32.c:97:47: error: ‘structdevice’ has no member named ‘pins’
>>       97 |                 ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
>> 	|                                               ^~
>>    drivers/pci/controller/dwc/pcie-stm32.c:97:61: error: ‘structdevice’ has no member named ‘pins’
>>       97 |                 ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
>> 	|                                                             ^~
>>    drivers/pci/controller/dwc/pcie-stm32.c:99:23: error: implicit declaration of function ‘pinctrl_pm_select_default_state’ [-Werror=implicit-function-declaration]
>>       99 |                 ret = pinctrl_pm_select_default_state(dev);
>> 	|                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
> 
> Hmm... I see two issues here. First is, wrong pinctrl header used. The correct
> one is:
> 
> #include <linux/pinctrl/consumer.h>

ah yes, the missing pinctrl_pm_select_default_state() should indeed be 
fixed by using the correct header.

> 
> Second issue is the driver accessing "struct device::pins" directly. The "pins"
> member won't be available if CONFIG_PINCTRL is not set (which is what your
> .config has). So either the member should not be accessed directly or the
> driver has to depend on CONFIG_PINCTRL. The latter one is not acceptable.It
> also looks weird that only this driver is accessing the "pins" member directly
> apart from the pinctrl core. So I think this part needs a revisit.
> 
> Christian?
The pinctrl "init" and "default" configurations are managed effectively 
by the probing code. The same approach is required in 
stm32_pcie_resume_noirq().

In this case, would introducing a new helper function, 
pinctrl_pm_select_init_state(), be preferable, even if we are the only 
consumer?

Thank you


> 
> - Mani
>