linux-kernel - Re: [PATCH v6 1/5] PCI: Don't disable decoding when mmio_always

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Message-ID: <CAAdtpL59=bpmEUgY56=xHS3w5ddtdVGjKnnW7i++a5sTzPs+3Q@mail.gmail.com>
Date:   Mon, 27 Apr 2020 09:42:32 +0200
From:   Philippe Mathieu-Daudé <f4bug@...at.org>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Paul Burton <paulburton@...nel.org>, linux-pci@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/5] PCI: Don't disable decoding when mmio_always_on is set

On Mon, Apr 27, 2020 at 8:08 AM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>
> Don't disable MEM/IO decoing when a device have both non_compliant_bars

Typo "decoing" -> "decoding"

> and mmio_always_on.
>
> That would allow us quirk devices with junk in BARs but can't disable
> their decoding.
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>  drivers/pci/probe.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 77b8a145c39b..d9c2c3301a8a 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1822,7 +1822,7 @@ int pci_setup_device(struct pci_dev *dev)
>         /* Device class may be changed after fixup */
>         class = dev->class >> 8;
>
> -       if (dev->non_compliant_bars) {
> +       if (dev->non_compliant_bars && !dev->mmio_always_on) {
>                 pci_read_config_word(dev, PCI_COMMAND, &cmd);
>                 if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
>                         pci_info(dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
> --
> 2.26.0.rc2
>