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

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Date:   Tue, 26 Jul 2022 16:41:09 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        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 7/26/22 15:03, Bjorn Helgaas wrote:
> 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.

Attached is the diff between Jim's and your branch just so it is easier to see what moved around.

Initial testing on an ARCH_BRCMSTB system with PCIe appears to be good, we don't have any regulator on that board so the dummy ones get picked up which is expected. Same thing with a Raspberry Pi 4B system.

I could unbind and bind again and there were no reference count leaks on the regulators, so this looks good to me.

Tested-by: Florian Fainelli <f.fainelli@...il.com>

of course, we should have Jim's test results as well as Cyril's ideally to make sure there are no regressions on the CM4 board.

Thanks Bjorn!
-- 
Florian
View attachment "jq-vs-bh.diff" of type "text/x-patch" (8082 bytes)