Merge branch 'pci/pm'

- Reduce wait time for secondary bus to be ready to speed up resume (Mika
  Westerberg)

- Avoid putting EloPOS E2/S2/H2 (as well as Elo i2) PCIe Ports in D3cold
  (Ondrej Zary)

- Call _REG when transitioning D-states so AML that uses the PCI config
  space OpRegion works, which fixes some ASMedia GPIO controllers (Mario
  Limonciello)

* pci/pm:
  PCI/ACPI: Call _REG when transitioning D-states
  PCI/ACPI: Validate acpi_pci_set_power_state() parameter
  PCI/PM: Avoid putting EloPOS E2/S2/H2 PCIe Ports in D3cold
  PCI/PM: Shorten pci_bridge_wait_for_secondary_bus() wait time for slow links

1 files changed, 42 insertions, 17 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9afb6114a4cf..60230da957e0 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -65,6 +65,13 @@ struct pci_pme_device {
 #define PME_TIMEOUT 1000 /* How long between PME checks */
 
 /*
+ * Following exit from Conventional Reset, devices must be ready within 1 sec
+ * (PCIe r6.0 sec 6.6.1).  A D3cold to D0 transition implies a Conventional
+ * Reset (PCIe r6.0 sec 5.8).
+ */
+#define PCI_RESET_WAIT 1000 /* msec */
+
+/*
  * Devices may extend the 1 sec period through Request Retry Status
  * completions (PCIe r6.0 sec 2.3.1).  The spec does not provide an upper
  * limit, but 60 sec ought to be enough for any device to become
@@ -2968,13 +2975,13 @@ static const struct dmi_system_id bridge_d3_blacklist[] = {
 	{
 		/*
 		 * Downstream device is not accessible after putting a root port
-		 * into D3cold and back into D0 on Elo i2.
+		 * into D3cold and back into D0 on Elo Continental Z2 board
 		 */
-		.ident = "Elo i2",
+		.ident = "Elo Continental Z2",
 		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Elo Touch Solutions"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Elo i2"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "RevB"),
+			DMI_MATCH(DMI_BOARD_VENDOR, "Elo Touch Solutions"),
+			DMI_MATCH(DMI_BOARD_NAME, "Geminilake"),
+			DMI_MATCH(DMI_BOARD_VERSION, "Continental Z2"),
 		},
 	},
 #endif
@@ -5102,11 +5109,9 @@ int pci_bridge_wait_for_secondary_bus(struct pci_dev *dev, char *reset_type)
 	 *
 	 * However, 100 ms is the minimum and the PCIe spec says the
 	 * software must allow at least 1s before it can determine that the
-	 * device that did not respond is a broken device. There is
-	 * evidence that 100 ms is not always enough, for example certain
-	 * Titan Ridge xHCI controller does not always respond to
-	 * configuration requests if we only wait for 100 ms (see
-	 * https://bugzilla.kernel.org/show_bug.cgi?id=203885).
+	 * device that did not respond is a broken device. Also device can
+	 * take longer than that to respond if it indicates so through Request
+	 * Retry Status completions.
 	 *
 	 * Therefore we wait for 100 ms and check for the device presence
 	 * until the timeout expires.
@@ -5115,16 +5120,36 @@ int pci_bridge_wait_for_secondary_bus(struct pci_dev *dev, char *reset_type)
 		return 0;
 
 	if (pcie_get_speed_cap(dev) <= PCIE_SPEED_5_0GT) {
+		u16 status;
+
 		pci_dbg(dev, "waiting %d ms for downstream link\n", delay);
 		msleep(delay);
-	} else {
-		pci_dbg(dev, "waiting %d ms for downstream link, after activation\n",
-			delay);
-		if (!pcie_wait_for_link_delay(dev, true, delay)) {
-			/* Did not train, no need to wait any further */
-			pci_info(dev, "Data Link Layer Link Active not set in 1000 msec\n");
+
+		if (!pci_dev_wait(child, reset_type, PCI_RESET_WAIT - delay))
+			return 0;
+
+		/*
+		 * If the port supports active link reporting we now check
+		 * whether the link is active and if not bail out early with
+		 * the assumption that the device is not present anymore.
+		 */
+		if (!dev->link_active_reporting)
 			return -ENOTTY;
-		}
+
+		pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &status);
+		if (!(status & PCI_EXP_LNKSTA_DLLLA))
+			return -ENOTTY;
+
+		return pci_dev_wait(child, reset_type,
+				    PCIE_RESET_READY_POLL_MS - PCI_RESET_WAIT);
+	}
+
+	pci_dbg(dev, "waiting %d ms for downstream link, after activation\n",
+		delay);
+	if (!pcie_wait_for_link_delay(dev, true, delay)) {
+		/* Did not train, no need to wait any further */
+		pci_info(dev, "Data Link Layer Link Active not set in 1000 msec\n");
+		return -ENOTTY;
 	}
 
 	return pci_dev_wait(child, reset_type,