Re: [PATCH 0/5] PCI/pwrctl: Ensure that the pwrctl drivers are probed before PCI client drivers

[Bartosz Golaszewski]

On Tue, 22 Oct 2024 at 12:28, Manivannan Sadhasivam via B4 Relay
<devnull+manivannan.sadhasivam.linaro.org@xxxxxxxxxx> wrote:
>
> Hi,
>
> This series reworks the PCI/pwrctl integration to ensure that the pwrctl drivers
> are always probed before the PCI client drivers. This series addresses a race
> condition when both pwrctl and pwrctl/pwrseq drivers probe parallely (even when
> the later one probes last). One such issue was reported for the Qcom X13s
> platform with WLAN module and fixed with 'commit a9aaf1ff88a8 ("power:
> sequencing: request the WLAN enable GPIO as-is")'.
>
> Though the issue was fixed with a hack in the pwrseq driver, it was clear that
> the issue is applicable to all pwrctl drivers. Hence, this series tries to
> address the issue in the PCI/pwrctl integration.
>
> - Mani
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> ---
> Manivannan Sadhasivam (5):
>       PCI/pwrctl: Use of_platform_device_create() to create pwrctl devices
>       PCI/pwrctl: Create pwrctl devices only if at least one power supply is present
>       PCI/pwrctl: Ensure that the pwrctl drivers are probed before the PCI client drivers
>       PCI/pwrctl: Move pwrctl device creation to its own helper function
>       PCI/pwrctl: Remove pwrctl device without iterating over all children of pwrctl parent
>
>  drivers/pci/bus.c         | 64 +++++++++++++++++++++++++++++++++++++++++------
>  drivers/pci/of.c          | 27 ++++++++++++++++++++
>  drivers/pci/pci.h         |  5 ++++
>  drivers/pci/pwrctl/core.c | 10 --------
>  drivers/pci/remove.c      | 17 ++++++-------
>  5 files changed, 96 insertions(+), 27 deletions(-)
> ---
> base-commit: 48dc7986beb60522eb217c0016f999cc7afaf0b7
> change-id: 20241022-pci-pwrctl-rework-a1b024158555
>
> Best regards,
> --
> Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
>
>

Excellent work, thanks for doing this.

Tested on: sc8280xp-crd, RB5 and sm8450-hdk.

Tested-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

Just a couple nits from my side under respective patches.

Bart