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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-pci@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 65/78] PCI/PM: Add pcie_wait_for_link_delay()
Date: Sat, 18 Apr 2020 10:40:34 -0400	[thread overview]
Message-ID: <20200418144047.9013-65-sashal@kernel.org> (raw)
In-Reply-To: <20200418144047.9013-1-sashal@kernel.org>

From: Mika Westerberg <mika.westerberg@linux.intel.com>

[ Upstream commit 4827d63891b6a839dac49c6ab62e61c4b011c4f2 ]

Add pcie_wait_for_link_delay().  Similar to pcie_wait_for_link() but allows
passing custom activation delay in milliseconds.

Link: https://lore.kernel.org/r/20191112091617.70282-2-mika.westerberg@linux.intel.com
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/pci.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 981ae16f935bc..94d6e120b4734 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4605,14 +4605,17 @@ static int pci_pm_reset(struct pci_dev *dev, int probe)
 
 	return pci_dev_wait(dev, "PM D3->D0", PCIE_RESET_READY_POLL_MS);
 }
+
 /**
- * pcie_wait_for_link - Wait until link is active or inactive
+ * pcie_wait_for_link_delay - Wait until link is active or inactive
  * @pdev: Bridge device
  * @active: waiting for active or inactive?
+ * @delay: Delay to wait after link has become active (in ms)
  *
  * Use this to wait till link becomes active or inactive.
  */
-bool pcie_wait_for_link(struct pci_dev *pdev, bool active)
+static bool pcie_wait_for_link_delay(struct pci_dev *pdev, bool active,
+				     int delay)
 {
 	int timeout = 1000;
 	bool ret;
@@ -4649,13 +4652,25 @@ bool pcie_wait_for_link(struct pci_dev *pdev, bool active)
 		timeout -= 10;
 	}
 	if (active && ret)
-		msleep(100);
+		msleep(delay);
 	else if (ret != active)
 		pci_info(pdev, "Data Link Layer Link Active not %s in 1000 msec\n",
 			active ? "set" : "cleared");
 	return ret == active;
 }
 
+/**
+ * pcie_wait_for_link - Wait until link is active or inactive
+ * @pdev: Bridge device
+ * @active: waiting for active or inactive?
+ *
+ * Use this to wait till link becomes active or inactive.
+ */
+bool pcie_wait_for_link(struct pci_dev *pdev, bool active)
+{
+	return pcie_wait_for_link_delay(pdev, active, 100);
+}
+
 void pci_reset_secondary_bus(struct pci_dev *dev)
 {
 	u16 ctrl;
-- 
2.20.1


  parent reply	other threads:[~2020-04-18 14:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200418144047.9013-1-sashal@kernel.org>
2020-04-18 14:39 ` [PATCH AUTOSEL 5.4 30/78] drm/nouveau: workaround runpm fail by disabling PCI power management on certain intel bridges Sasha Levin
2020-04-18 14:40 ` Sasha Levin [this message]
2020-04-18 14:40 ` [PATCH AUTOSEL 5.4 67/78] PCI: pciehp: Prevent deadlock on disconnect Sasha Levin
2020-04-18 14:40 ` [PATCH AUTOSEL 5.4 70/78] pci/hotplug/pnv-php: Remove erroneous warning Sasha Levin
2020-04-21 11:03   ` Frederic Barrat
2020-04-18 14:40 ` [PATCH AUTOSEL 5.4 77/78] PCI/ASPM: Allow re-enabling Clock PM Sasha Levin
2020-04-18 14:40 ` [PATCH AUTOSEL 5.4 78/78] PCI/PM: Add missing link delays required by the PCIe spec Sasha Levin

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