| Message ID | 20190517105702.4522-1-m.szyprowski@samsung.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [v4] usb: exynos: add workaround for the USB device bindings conflict | expand |
On Fri, 17 May 2019, Marek Szyprowski wrote: > 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> > --- > v4: > - 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 | 10 ++++++++++ > drivers/usb/host/ohci-exynos.c | 10 ++++++++++ > 2 files changed, 20 insertions(+) > > diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c > index 8e3bab1e0c1f..b127642332ee 100644 > --- a/drivers/usb/host/ehci-exynos.c > +++ b/drivers/usb/host/ehci-exynos.c > @@ -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)); > You forgot to adjust the fail_add_hcd: error pathway in exynos_ehci_probe(). > @@ -231,6 +239,8 @@ 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); > diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c > index c0c4dcca6f3c..29f65963af3b 100644 > --- a/drivers/usb/host/ohci-exynos.c > +++ b/drivers/usb/host/ohci-exynos.c > @@ -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"); And same here. Alan Stern > @@ -192,6 +200,8 @@ 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); >
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c index 8e3bab1e0c1f..b127642332ee 100644 --- a/drivers/usb/host/ehci-exynos.c +++ b/drivers/usb/host/ehci-exynos.c @@ -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)); @@ -231,6 +239,8 @@ 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); diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c index c0c4dcca6f3c..29f65963af3b 100644 --- a/drivers/usb/host/ohci-exynos.c +++ b/drivers/usb/host/ohci-exynos.c @@ -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"); @@ -192,6 +200,8 @@ 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> --- v4: - 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 | 10 ++++++++++ drivers/usb/host/ohci-exynos.c | 10 ++++++++++ 2 files changed, 20 insertions(+)