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Message-ID: <4af7c132-1100-3d48-2311-e6be3bdf3629@gmail.com>
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 WilczyĆski <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)
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