From patchwork Tue Aug 30 16:56:54 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Myron Stowe X-Patchwork-Id: 1113562 X-Patchwork-Delegate: bhelgaas@google.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p7UGubjH013240 for ; Tue, 30 Aug 2011 16:57:12 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754262Ab1H3Q5M (ORCPT ); Tue, 30 Aug 2011 12:57:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:9448 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752296Ab1H3Q5L (ORCPT ); Tue, 30 Aug 2011 12:57:11 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p7UGuth7019558 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 30 Aug 2011 12:56:55 -0400 Received: from amt.stowe (ovpn-113-21.phx2.redhat.com [10.3.113.21]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id p7UGuscF021684; Tue, 30 Aug 2011 12:56:54 -0400 From: Myron Stowe Subject: [PATCH 7/7] PCI: latency timer doesn't apply to PCIe To: jbarnes@virtuousgeek.org Cc: linux-pci@vger.kernel.org, dhowells@redhat.com, ralf@linux-mips.org, yasutake.koichi@jp.panasonic.com, lethal@linux-sh.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Date: Tue, 30 Aug 2011 10:56:54 -0600 Message-ID: <20110830165654.337.31849.stgit@amt.stowe> In-Reply-To: <20110830165609.337.22206.stgit@amt.stowe> References: <20110830165609.337.22206.stgit@amt.stowe> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Tue, 30 Aug 2011 16:57:12 +0000 (UTC) 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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html 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;