From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Colin Ian King , Bjorn Helgaas Subject: [ 03/15] PCI: Allow pcie_aspm=force even when FADT indicates it is unsupported Date: Thu, 24 Jan 2013 13:18:27 -0800 Message-Id: <20130124211724.627862088@linuxfoundation.org> In-Reply-To: <20130124211723.489089115@linuxfoundation.org> References: <20130124211723.489089115@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Colin Ian King commit 9e16721498b0c3d3ebfa0b503c63d35c0a4c0642 upstream. Right now using pcie_aspm=force will not enable ASPM if the FADT indicates ASPM is unsupported. However, the semantics of force should probably allow for this, especially as they did before 3c076351c4 ("PCI: Rework ASPM disable code") This patch just skips the clearing of any ASPM setup that the firmware has carried out on this bus if pcie_aspm=force is being used. Reference: http://bugs.launchpad.net/bugs/962038 Signed-off-by: Colin Ian King Signed-off-by: Bjorn Helgaas Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pcie/aspm.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -790,6 +790,9 @@ void pcie_clear_aspm(struct pci_bus *bus { struct pci_dev *child; + if (aspm_force) + return; + /* * Clear any ASPM setup that the firmware has carried out on this bus */