[PATCH 07/10] usb: host: xhci-tegra: Enable runtime PM as late as possible

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Thierry Reding <treding@xxxxxxxxxx>

A number of things can currently go wrong after the XUSB controller has
been enabled, which means that it might need to be disabled again before
it has ever been used.

Avoid this by delaying runtime PM enablement until it's really required
right before registers are accessed for the first time.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
 drivers/usb/host/xhci-tegra.c | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 5eca3ea0e8b2..f043aab7bf53 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -1246,19 +1246,6 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 		goto put_hcd;
 	}
 
-	pm_runtime_enable(&pdev->dev);
-	if (pm_runtime_enabled(&pdev->dev))
-		err = pm_runtime_get_sync(&pdev->dev);
-	else
-		err = tegra_xusb_runtime_resume(&pdev->dev);
-
-	if (err < 0) {
-		dev_err(&pdev->dev, "failed to enable device: %d\n", err);
-		goto disable_phy;
-	}
-
-	tegra_xusb_config(tegra);
-
 	/*
 	 * The XUSB Falcon microcontroller can only address 40 bits, so set
 	 * the DMA mask accordingly.
@@ -1266,7 +1253,7 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 	err = dma_set_mask_and_coherent(tegra->dev, DMA_BIT_MASK(40));
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to set DMA mask: %d\n", err);
-		goto put_rpm;
+		goto disable_phy;
 	}
 
 	err = tegra_xusb_request_firmware(tegra);
@@ -1275,16 +1262,30 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 		goto disable_phy;
 	}
 
+	pm_runtime_enable(&pdev->dev);
+
+	if (!pm_runtime_enabled(&pdev->dev))
+		err = tegra_xusb_runtime_resume(&pdev->dev);
+	else
+		err = pm_runtime_get_sync(&pdev->dev);
+
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to enable device: %d\n", err);
+		goto free_firmware;
+	}
+
+	tegra_xusb_config(tegra);
+
 	err = tegra_xusb_load_firmware(tegra);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to load firmware: %d\n", err);
-		goto free_firmware;
+		goto put_rpm;
 	}
 
 	err = usb_add_hcd(tegra->hcd, tegra->xhci_irq, IRQF_SHARED);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to add USB HCD: %d\n", err);
-		goto free_firmware;
+		goto put_rpm;
 	}
 
 	device_wakeup_enable(tegra->hcd->self.controller);
-- 
2.23.0




[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux