PCI: Wait for up to 1000ms after FLR reset

}

EXPORT_SYMBOL(pci_wait_for_pending_transaction);

/*

 * We should only need to wait 100ms after FLR, but some devices take longer.

 * Wait for up to 1000ms for config space to return something other than -1.

 * Intel IGD requires this when an LCD panel is attached.  We read the 2nd

 * dword because VFs don't implement the 1st dword.

 */

static void pci_flr_wait(struct pci_dev *dev)

{

	int i = 0;

	u32 id;

	do {

		msleep(100);

		pci_read_config_dword(dev, PCI_COMMAND, &id);

	} while (i++ < 10 && id == ~0);

	if (id == ~0)

		dev_warn(&dev->dev, "Failed to return from FLR\n");

	else if (i > 1)

		dev_info(&dev->dev, "Required additional %dms to return from FLR\n",

			 (i - 1) * 100);

}

static int pcie_flr(struct pci_dev *dev, int probe)

{

	u32 cap;

		dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n");

	pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);

	msleep(100);

	pci_flr_wait(dev);

	return 0;

}

		dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n");

	pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);

	msleep(100);

	pci_flr_wait(dev);

	return 0;

}