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authorJon Hunter <jonathanh@nvidia.com>2018-05-16 16:48:53 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-24 19:23:02 +0300
commitf468b55cb72ddd69b08ecfc791046a6db5fde7b0 (patch)
tree45612f87480a83d530c9c580141a096aec3797c8 /drivers/usb
parentca7d9515d0e6825351ce106066cea1f60e40b1c8 (diff)
downloadlinux-f468b55cb72ddd69b08ecfc791046a6db5fde7b0.tar.xz
usb: xhci: tegra: Prepare for adding runtime PM support
When adding runtime PM support to the Tegra XHCI driver, it is desirable to move the function calls to enable the clocks, regulators and PHY from the tegra_xusb_probe into the runtime PM handlers. Currently, the clocks, regulators and PHY are all enabled before we call usb_create_hcd() in tegra_xusb_probe(), however, we cannot call pm_runtime_get_sync() at this point because the platform device data is not yet initialised. Fortunately, the function usb_create_hcd() can be called before we enable the clocks, regulators and PHY and so prepare for adding runtime PM support, by moving the call to usb_create_hcd() before we enable the hardware. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci-tegra.c34
1 files changed, 17 insertions, 17 deletions
diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 2c076ea80522..02b0b24faa58 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -1054,10 +1054,23 @@ static int tegra_xusb_probe(struct platform_device *pdev)
}
}
+ tegra->hcd = usb_create_hcd(&tegra_xhci_hc_driver, &pdev->dev,
+ dev_name(&pdev->dev));
+ if (!tegra->hcd) {
+ err = -ENOMEM;
+ goto put_padctl;
+ }
+
+ /*
+ * This must happen after usb_create_hcd(), because usb_create_hcd()
+ * will overwrite the drvdata of the device with the hcd it creates.
+ */
+ platform_set_drvdata(pdev, tegra);
+
err = tegra_xusb_clk_enable(tegra);
if (err) {
dev_err(&pdev->dev, "failed to enable clocks: %d\n", err);
- goto put_padctl;
+ goto put_usb2;
}
err = regulator_bulk_enable(tegra->soc->num_supplies, tegra->supplies);
@@ -1080,19 +1093,6 @@ static int tegra_xusb_probe(struct platform_device *pdev)
goto disable_phy;
}
- tegra->hcd = usb_create_hcd(&tegra_xhci_hc_driver, &pdev->dev,
- dev_name(&pdev->dev));
- if (!tegra->hcd) {
- err = -ENOMEM;
- goto disable_phy;
- }
-
- /*
- * This must happen after usb_create_hcd(), because usb_create_hcd()
- * will overwrite the drvdata of the device with the hcd it creates.
- */
- platform_set_drvdata(pdev, tegra);
-
tegra->hcd->regs = tegra->regs;
tegra->hcd->rsrc_start = regs->start;
tegra->hcd->rsrc_len = resource_size(regs);
@@ -1100,7 +1100,7 @@ static int tegra_xusb_probe(struct platform_device *pdev)
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 put_usb2;
+ goto disable_phy;
}
device_wakeup_enable(tegra->hcd->self.controller);
@@ -1155,14 +1155,14 @@ put_usb3:
usb_put_hcd(xhci->shared_hcd);
remove_usb2:
usb_remove_hcd(tegra->hcd);
-put_usb2:
- usb_put_hcd(tegra->hcd);
disable_phy:
tegra_xusb_phy_disable(tegra);
disable_regulator:
regulator_bulk_disable(tegra->soc->num_supplies, tegra->supplies);
disable_clk:
tegra_xusb_clk_disable(tegra);
+put_usb2:
+ usb_put_hcd(tegra->hcd);
put_padctl:
tegra_xusb_padctl_put(tegra->padctl);
return err;