linux-kernel - Re: [PATCH v7 1/5] PCI: Don't disable decoding when mmio_always

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Date:   Fri, 8 May 2020 13:51:38 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     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,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/5] PCI: Don't disable decoding when mmio_always_on
 is set

On Tue, Apr 28, 2020 at 09:14:16AM +0800, Jiaxun Yang wrote:
> Don't disable MEM/IO decoding when a device have both non_compliant_bars
> 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>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.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
>