2 files changed, 16 insertions, 7 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1808f1157f30..82d6aeb5228f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2048,7 +2048,9 @@ and is between 256 and 4096 characters. It is defined in the file
                         WARNING: Forcing ASPM on may cause system lockups.
 
         pcie_pme=       [PCIE,PM] Native PCIe PME signaling options:
-                off     Do not use native PCIe PME signaling.
+                        Format: {auto|force}[,nomsi]
+                auto    Use native PCIe PME signaling if the BIOS allows the
+                        kernel to control PCIe config registers of root ports.
                 force   Use native PCIe PME signaling even if the BIOS refuses
                         to allow the kernel to control the relevant PCIe config
                         registers.
diff --git a/drivers/pci/pcie/pme/pcie_pme.c b/drivers/pci/pcie/pme/pcie_pme.c
index aac285a16b62..d672a0a63816 100644
--- a/drivers/pci/pcie/pme/pcie_pme.c
+++ b/drivers/pci/pcie/pme/pcie_pme.c
@@ -34,7 +34,7 @@
  * being registered.  Consequently, the interrupt-based PCIe PME signaling will
  * not be used by any PCIe root ports in that case.
  */
-static bool pcie_pme_disabled;
+static bool pcie_pme_disabled = true;
 
 /*
  * The PCI Express Base Specification 2.0, Section 6.1.8, states the following:
@@ -64,12 +64,19 @@ bool pcie_pme_msi_disabled;
 
 static int __init pcie_pme_setup(char *str)
 {
-        if (!strcmp(str, "off"))
-                pcie_pme_disabled = true;
-        else if (!strcmp(str, "force"))
+        if (!strncmp(str, "auto", 4))
+                pcie_pme_disabled = false;
+        else if (!strncmp(str, "force", 5))
                 pcie_pme_force_enable = true;
-        else if (!strcmp(str, "nomsi"))
-                pcie_pme_msi_disabled = true;
+
+        str = strchr(str, ',');
+        if (str) {
+                str++;
+                str += strspn(str, " \t");
+                if (*str && !strcmp(str, "nomsi"))
+                        pcie_pme_msi_disabled = true;
+        }
+
         return 1;
 }
 __setup("pcie_pme=", pcie_pme_setup);