linux-kernel - [PATCH v3 0/3] PCI: apple: Assorted #PERST fixes

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Date:   Tue, 23 Nov 2021 18:06:33 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org
Cc:     Pali Rohár <pali@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Luca Ceresoli <luca@...aceresoli.net>, kernel-team@...roid.com
Subject: [PATCH v3 0/3] PCI: apple: Assorted #PERST fixes

Apologies for the rapid fire (I tend to be much more conservative when
resending series), but given that this series has a direct impact on
other projects (such as u-boot), I'm trying to converge as quickly as
possible.

This series aims at fixing a number of issues for the recently merged
Apple PCIe driver, all revolving around the mishandling of #PERST:

- we didn't properly drive #PERST, and we didn't follow the specified
  timings
  
- the DT had the wrong polarity, which has impacts on the driver
  itself

Hopefully, this should address all the issues reported so far.

* From v2:
  - Fixed DT
  - Fixed #PERST polarity in the driver
  - Collected Pali's ack on patch #1

[1] https://lore.kernel.org/r/20211122104156.518063-1-maz@kernel.org

Marc Zyngier (3):
  PCI: apple: Follow the PCIe specifications when resetting the port
  arm64: dts: apple: t8103: Fix PCIe #PERST polarity
  PCI: apple: Fix #PERST polarity

 arch/arm64/boot/dts/apple/t8103.dtsi |  7 ++++---
 drivers/pci/controller/pcie-apple.c  | 12 +++++++++++-
 2 files changed, 15 insertions(+), 4 deletions(-)

-- 
2.30.2