X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=drivers%2Fpci%2Fpcie%2Faspm.c;h=851f5b83cdbc3f62f352627d0ee91848fc9923c0;hp=f82495583e63c123a89a41e23af1b658ac509a62;hb=708244b3f3d5dad958059729c384a068ecd46161;hpb=e4e0fadcd929138aa82130a1c5f22206d86d7bb2

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index f82495583e63..851f5b83cdbc 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -55,7 +55,7 @@ struct pcie_link_state {
 	struct endpoint_state endpoints[8];
 };
 
-static int aspm_disabled;
+static int aspm_disabled, aspm_force;
 static DEFINE_MUTEX(aspm_lock);
 static LIST_HEAD(link_list);
 
@@ -510,6 +510,7 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
 {
 	struct pci_dev *child_dev;
 	int child_pos;
+	u32 reg32;
 
 	/*
 	 * Some functions in a slot might not all be PCIE functions, very
@@ -519,6 +520,19 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
 		child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
 		if (!child_pos)
 			return -EINVAL;
+
+		/*
+		 * Disable ASPM for pre-1.1 PCIe device, we follow MS to use
+		 * RBER bit to determine if a function is 1.1 version device
+		 */
+		pci_read_config_dword(child_dev, child_pos + PCI_EXP_DEVCAP,
+			&reg32);
+		if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) {
+			printk("Pre-1.1 PCIe device detected, "
+				"disable ASPM for %s. It can be enabled forcedly"
+				" with 'pcie_aspm=force'\n", pci_name(pdev));
+			return -EINVAL;
+		}
 	}
 	return 0;
 }
@@ -802,11 +816,23 @@ void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
 
 static int __init pcie_aspm_disable(char *str)
 {
-	aspm_disabled = 1;
+	if (!strcmp(str, "off")) {
+		aspm_disabled = 1;
+		printk(KERN_INFO "PCIe ASPM is disabled\n");
+	} else if (!strcmp(str, "force")) {
+		aspm_force = 1;
+		printk(KERN_INFO "PCIe ASPM is forcedly enabled\n");
+	}
 	return 1;
 }
 
-__setup("pcie_noaspm", pcie_aspm_disable);
+__setup("pcie_aspm=", pcie_aspm_disable);
+
+void pcie_no_aspm(void)
+{
+	if (!aspm_force)
+		aspm_disabled = 1;
+}
 
 #ifdef CONFIG_ACPI
 #include <acpi/acpi_bus.h>