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usb: exynos: add workaround for the USB device bindings conflict

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Commit 69bec72598 ("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 01fdf179f4
("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>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Szyprowski 2019-05-20 11:08:23 +02:00 committed by Greg Kroah-Hartman
parent 3a38e874d7
commit 01d4071486
2 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/usb/host/ehci-exynos.c
View File

@ -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);

11
drivers/usb/host/ohci-exynos.c
View File

@ -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);