From f676678f8952d5e2bfc03903dba410c856ae3f3d Mon Sep 17 00:00:00 2001 From: Myron Stowe Date: Fri, 28 Oct 2011 15:49:20 -0600 Subject: [PATCH] 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 Signed-off-by: Jesse Barnes --- drivers/pci/pci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index f9abe84cf5e0..5c5adef85bd7 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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; -- 2.20.1