@@ -39,6 +39,7 @@ static struct hc_driver __read_mostly exynos_ehci_hc_driver;
struct exynos_ehci_hcd {
struct clk *clk;
+ struct device_node *of_node;
struct phy *phy[PHY_NUMBER];
};
@@ -203,6 +204,13 @@ static int exynos_ehci_probe(struct platform_device *pdev)
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
+ /*
+ * Workaround: reset of_node pointer to avoid conflict between Exynos
+ * EHCI port subnodes and generic USB device bindings
+ */
+ exynos_ehci->of_node = pdev->dev.of_node;
+ pdev->dev.of_node = NULL;
+
/* DMA burst Enable */
writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
@@ -219,6 +227,7 @@ static int exynos_ehci_probe(struct platform_device *pdev)
fail_add_hcd:
exynos_ehci_phy_disable(&pdev->dev);
+ pdev->dev.of_node = exynos_ehci->of_node;
fail_io:
clk_disable_unprepare(exynos_ehci->clk);
fail_clk:
@@ -231,6 +240,8 @@ static int exynos_ehci_remove(struct platform_device *pdev)
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+ pdev->dev.of_node = exynos_ehci->of_node;
+
usb_remove_hcd(hcd);
exynos_ehci_phy_disable(&pdev->dev);
@@ -30,6 +30,7 @@ static struct hc_driver __read_mostly exynos_ohci_hc_driver;
struct exynos_ohci_hcd {
struct clk *clk;
+ struct device_node *of_node;
struct phy *phy[PHY_NUMBER];
};
@@ -170,6 +171,13 @@ static int exynos_ohci_probe(struct platform_device *pdev)
goto fail_io;
}
+ /*
+ * Workaround: reset of_node pointer to avoid conflict between Exynos
+ * OHCI port subnodes and generic USB device bindings
+ */
+ exynos_ohci->of_node = pdev->dev.of_node;
+ pdev->dev.of_node = NULL;
+
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err) {
dev_err(&pdev->dev, "Failed to add USB HCD\n");
@@ -180,6 +188,7 @@ static int exynos_ohci_probe(struct platform_device *pdev)
fail_add_hcd:
exynos_ohci_phy_disable(&pdev->dev);
+ pdev->dev.of_node = exynos_ohci->of_node;
fail_io:
clk_disable_unprepare(exynos_ohci->clk);
fail_clk:
@@ -192,6 +201,8 @@ static int exynos_ohci_remove(struct platform_device *pdev)
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ pdev->dev.of_node = exynos_ohci->of_node;
+
usb_remove_hcd(hcd);
exynos_ohci_phy_disable(&pdev->dev);
Commit 69bec7259853 ("USB: core: let USB device know device node") added support for attaching devicetree node for USB devices. Those nodes are children of their USB host controller. However Exynos EHCI and OHCI driver bindings already define child-nodes for each physical root hub port and assigns respective PHY controller and parameters to them. Those bindings predates support for USB device tree nodes. To mitigate the side-effects of the conflict between those bindings, lets reset Exynos host controller of_node pointer before registering it to USB subsystem. This fixes the issue raised by the commit 01fdf179f4b0 ("usb: core: skip interfaces disabled in devicetree"), which incorrectly disabled some devices on Exynos based boards. Reported-by: Markus Reichl <m.reichl@fivetechno.de> Suggested-by: Måns Rullgård <mans@mansr.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- v5: - fixed error path handling as pointed by Alan v4: https://patchwork.kernel.org/patch/10947773/ - moved workaround to Exynos OHCI/EHCI drivers as suggested by Måns v3: https://lkml.org/lkml/2019/5/9/119 - replaced ad hoc checks by proper test for proper value of the compatible string in drivers/usb/core/of.c v2: https://lkml.org/lkml/2019/5/8/321 v1: https://lkml.org/lkml/2019/5/7/715 --- drivers/usb/host/ehci-exynos.c | 11 +++++++++++ drivers/usb/host/ohci-exynos.c | 11 +++++++++++ 2 files changed, 22 insertions(+)