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Commit f676678f authored by Myron Stowe's avatar Myron Stowe Committed by Jesse Barnes
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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: default avatarMyron Stowe <myron.stowe@redhat.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent b9a276ad

drivers/pci/pci.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -2613,6 +2613,10 @@ void __weak pcibios_set_master(struct pci_dev *dev) 
{

{

	u8 lat;

	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);

	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);

	if (lat < 16)

	if (lat < 16)

		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;

		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;