linux-kernel - Re: [PATCH v2 3/3] PCI: brcmstb: Set PCIe transaction completion timeout

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Date:   Wed, 12 Apr 2023 02:26:21 +0200
From:   Cyril Brulebois <kibi@...ian.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>,
        Phil Elwell <phil@...pberrypi.com>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] PCI: brcmstb: Set PCIe transaction completion
 timeout

Hi Jim,

Jim Quinlan <jim2101024@...il.com> (2023-04-11):
> Since the STB PCIe HW will cause a CPU abort on a PCIe transaction
> completion timeout abort, we might as well extend the default timeout
> limit.  Further, different devices and systems may requires a larger or
> smaller amount commensurate with their L1SS exit time, so the property
> "brcm,completion-abort-us" may be used to set a custom timeout value.
   ^^^^^^^^^^^^^^^^^^^^^^^^

> +	ret = of_property_read_u32(pcie->np, "brcm,completion-timeout-us",
> +				   &timeout_us);
> +	if (ret && ret != -EINVAL)
> +		dev_err(pcie->dev, "malformed/invalid 'brcm,completion-timeout-us'\n");

v2 renames brcm,completion-abort-msecs into brcm,completion-timeout-us
but the commit message mentions the half-way brcm,completion-abort-us
property instead.

(Also spotted “immplementation” in 2/3 but I thought I'd spare everyone
an extra mail.)


Cheers,
-- 
Cyril Brulebois (kibi@...ian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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