Commit f676678f authored Oct 28, 2011 by Myron Stowe Committed by Jesse Barnes Jan 06, 2012

PCI: latency timer doesn't apply to PCIe



The latency timer is read-only and hardwired to zero for all PCIe
devices, both Type 0 and Type 1, so don't bother trying to update it
and cluttering the dmesg log with meaningless "setting latency timer
to 64" messages.

Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

parent b9a276ad

drivers/pci/pci.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2613,6 +2613,10 @@ void __weak pcibios_set_master(struct pci_dev *dev)
		{
		u8 lat;

		/* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
		if (pci_is_pcie(dev))
		return;

		pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
		if (lat < 16)
		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;

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