linux-kernel - Re: [PATCH v3 0/7] PCI: brcmstb: Re-submit reverted patchset

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Message-ID: <20220726220303.GA109624@bhelgaas>
Date:   Tue, 26 Jul 2022 17:03:03 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Krzysztof Wilczyński <kw@...ux.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 0/7] PCI: brcmstb: Re-submit reverted patchset

On Mon, Jul 25, 2022 at 11:12:49AM -0400, Jim Quinlan wrote:
> ...
> Jim Quinlan (7):
>   PCI: brcmstb: Remove unnecessary forward declarations
>   PCI: brcmstb: Split brcm_pcie_setup() into two funcs
>   PCI: brcmstb: Gate config space access on link status
>   PCI: brcmstb: Add mechanism to turn on subdev regulators
>   PCI: brcmstb: Add control of subdevice voltage regulators
>   PCI: brcmstb: Do not turn off WOL regulators on suspend
>   PCI: brcmstb: Have .map_bus function names end with 'map_bus'
> 
>  drivers/pci/controller/pcie-brcmstb.c | 476 ++++++++++++++++++--------
>  1 file changed, 341 insertions(+), 135 deletions(-)

I reworked these and put them on pci/ctrl/brcm for v5.20.  This is a
proposal, not something set in stone.  But time is of the essence to
figure out how we want to proceed.

I changed a lot of stuff and it's likely I broke something in the
process, so please take a look and test this out.  Here's an outline
of what I changed:

  - Moved the config access "link up" check earlier because it's not
    related to the power regulator patches.

  - Changed config access "link up" checks to use PCIE_ECAM_REG()
    instead of hard-coding 0xfff masks.  The 32-bit accessors already
    mask out the low two bits, so we don't need to do that here.

  - Squashed pci_subdev_regulators_add_bus() directly into
    brcm_pcie_add_bus() for readability.  Similarly for
    pci_subdev_regulators_remove_bus().

  - This makes a clear split between:

    * A patch that adds get/enable of regulators, and starting the
      link after enabling regulators, and

    * A patch that disables/enables regulators for suspend/resume.

  - Since we only support one set of subregulator info (for one Root
    Port, and brcm_pcie_suspend_noirq() depends on this since it uses
    the pcie->sr pointer), use pcie->sr always instead of
    dev->driver_data.

  - Squashed wakeup device checking into the suspend/resume patch so
    there's not a time when suspend might turn off power to a wakeup
    device.

  - Renamed brcm_pcie_map_bus32() to brcm7425_pcie_map_bus() so it
    ends in "_map_bus()" like other drivers.  Also,
    brcm7425_pcie_map_bus() doesn't actually depend on the 32-bitness.

Bjorn