[PATCH] PCI: Add Broadcom 4331 reset quirk to prevent IRQ storm

[Michael Büsch]

On Tue, 29 Mar 2016 19:41:30 +0200
Lukas Wunner <lukas at wunner.de> wrote:

> +static void quirk_apple_b43_reset(struct pci_dev *dev)
> +{
> +	void __iomem *mmio;
> +
> +	if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc.") || !dev->bus->self ||
> +	    pci_pcie_type(dev->bus->self) != PCI_EXP_TYPE_ROOT_PORT)
> +		return;
> +
> +	mmio = pci_iomap(dev, 0, 0);
> +	if (!mmio) {
> +		pr_err("b43 quirk: Cannot iomap device, IRQ storm ahead\n");
> +		return;
> +	}
> +	iowrite32(BCMA_RESET_CTL_RESET,
> +		  mmio + (1 * BCMA_CORE_SIZE) + BCMA_RESET_CTL);
> +	pci_iounmap(dev, mmio);
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, 0x4331, quirk_apple_b43_reset);

Looks good, as long as the wireless core is always guaranteed to be
the second core on that PCI device.

-- 
Michael
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