linux-kernel - [PATCH V5 0/3] PCI: designware-ep: Fix DBI access before core init

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Date:   Thu, 13 Oct 2022 23:27:09 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lpieralisi@...nel.org>, <robh@...nel.org>, <kw@...ux.com>,
        <bhelgaas@...gle.com>, <mani@...nel.org>,
        <Sergey.Semin@...kalelectronics.ru>, <dmitry.baryshkov@...aro.org>,
        <linmq006@...il.com>, <ffclaire1224@...il.com>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V5 0/3] PCI: designware-ep: Fix DBI access before core init

This series attempts to fix the issue with core register (Ex:- DBI) accesses
causing system hang issues in platforms where there is a dependency on the
availability of PCIe Reference clock from the host for their core
initialization.
This series is verified on Tegra194 & Tegra234 platforms.

Manivannan, could you please verify on qcom platforms?

V5:
* Addressed review comments from Bjorn
* Changed dw_pcie_ep_init_complete() to dw_pcie_ep_init_late()
* Skipped memory allocation if done already. This is to avoid freeing and then
  allocating again during PERST# toggles from the host.

V4:
* Addressed review comments from Bjorn and Manivannan
* Added .ep_init_late() ops
* Added patches to refactor code in qcom and tegra platforms

Vidya Sagar (3):
  PCI: designware-ep: Fix DBI access before core init
  PCI: qcom-ep: Refactor EP initialization completion
  PCI: tegra194: Refactor EP initialization completion

 .../pci/controller/dwc/pcie-designware-ep.c   | 125 +++++++++++-------
 drivers/pci/controller/dwc/pcie-designware.h  |  10 +-
 drivers/pci/controller/dwc/pcie-qcom-ep.c     |  27 ++--
 drivers/pci/controller/dwc/pcie-tegra194.c    |   4 +-
 4 files changed, 97 insertions(+), 69 deletions(-)

-- 
2.17.1