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

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Message-Id: <20241022-pci-pwrctl-rework-v1-0-94a7e90f58c5@linaro.org>
Date: Tue, 22 Oct 2024 15:57:28 +0530
From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.linaro.org@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Johan Hovold <johan+linaro@...nel.org>, Abel Vesa <abel.vesa@...aro.org>, 
 Stephan Gerhold <stephan.gerhold@...aro.org>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Bjorn Andersson <bjorn.andersson@....qualcomm.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 stable+noautosel@...nel.org
Subject: [PATCH 0/5] PCI/pwrctl: Ensure that the pwrctl drivers are probed
 before PCI client drivers

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@...aro.org>
---
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@...aro.org>