From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933579Ab1J1Vvy (ORCPT ); Fri, 28 Oct 2011 17:51:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:8414 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933502Ab1J1Vvw (ORCPT ); Fri, 28 Oct 2011 17:51:52 -0400 From: Myron Stowe Subject: [PATCH -v2 16/16] PCI: latency timer doesn't apply to PCIe To: jbarnes@virtuousgeek.org Cc: linux-pci@vger.kernel.org, linux@arm.linux.org.uk, vapier@gentoo.org, dhowells@redhat.com, ysato@users.sourceforge.jp, tony.luck@intel.com, fenghua.yu@intel.com, monstr@monstr.eu, ralf@linux-mips.org, benh@kernel.crashing.org, paulus@samba.org, lethal@linux-sh.org, davem@davemloft.net, cmetcalf@tilera.com, gxt@mprc.pku.edu.cn, tglx@linutronix.de, mingo@redhat.com, chris@zankel.net, linux-kernel@vger.kernel.org Date: Fri, 28 Oct 2011 15:49:20 -0600 Message-ID: <20111028214920.20088.85205.stgit@amt.stowe> In-Reply-To: <20111028214726.20088.30551.stgit@amt.stowe> References: <20111028214726.20088.30551.stgit@amt.stowe> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Myron Stowe 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 --- drivers/pci/pci.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index a50e643..a20c01a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2607,6 +2607,10 @@ 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;