On Mon, 9 Mar 2020, Lubomir Rintel wrote:
> Turns out the undocumented and reserved bits of port status/control
> register of the root port need to be set to use the HCI in HSIC mode.
>
> Typically the firmware does this, but that is not always good enough,
> because the bits get lost if the HSIC clock is disabled (e.g. when
> ehci-mv is build as a module).
>
> This supplements commit 7b104f890ade ("USB: EHCI: ehci-mv: add HSIC
> support").
>
> Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/host/ehci-mv.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/usb/host/ehci-mv.c b/drivers/usb/host/ehci-mv.c
> index bd4f6ef534d96..ddb668963955f 100644
> --- a/drivers/usb/host/ehci-mv.c
> +++ b/drivers/usb/host/ehci-mv.c
> @@ -110,6 +110,7 @@ static int mv_ehci_probe(struct platform_device *pdev)
> struct resource *r;
> int retval = -ENODEV;
> u32 offset;
> + u32 status;
>
> if (usb_disabled())
> return -ENODEV;
> @@ -213,6 +214,14 @@ static int mv_ehci_probe(struct platform_device *pdev)
> device_wakeup_enable(hcd->self.controller);
> }
>
> + if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC) {
> + status = ehci_readl(ehci, &ehci->regs->port_status[0]);
> + /* These "reserved" bits actually enable HSIC mode. */
> + status |= BIT(25);
> + status &= ~GENMASK(31, 30);
> + ehci_writel(ehci, status, &ehci->regs->port_status[0]);
> + }
> +
> dev_info(&pdev->dev,
> "successful find EHCI device with regs 0x%p irq %d"
> " working in %s mode\n", hcd->regs, hcd->irq,
>
