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usb: ehci: add rockchip relinquishing port quirk support

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Add a quirk to support rockchip relinquishing port from abnormal ohci
to ehci when FS/LS devices plug in.

To support this function, the rockchip-relinquish-port property must be
specified in ehci node of dt.

Change-Id: I91b58905132282ef2a836d54a1c7ace1e334d119
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
This commit is contained in:
Frank Wang
2017-03-29 18:26:34 +08:00
committed by Huang, Tao
parent e3b77467de
commit cfe6f1dd57
1 changed files with 17 additions and 0 deletions
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17
drivers/usb/host/ehci-platform.c
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@@ -51,6 +51,18 @@ struct ehci_platform_priv {
static const char hcd_name[] = "ehci-platform";
static void ehci_rockchip_relinquish_port(struct usb_hcd *hcd, int portnum)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
u32 __iomem *status_reg = &ehci->regs->port_status[--portnum];
u32 portsc;
portsc = ehci_readl(ehci, status_reg);
portsc &= ~(PORT_OWNER | PORT_RWC_BITS);
ehci_writel(ehci, portsc, status_reg);
}
static int ehci_platform_reset(struct usb_hcd *hcd)
{
struct platform_device *pdev = to_platform_device(hcd->self.controller);
@@ -202,6 +214,11 @@ static int ehci_platform_probe(struct platform_device *dev)
"has-transaction-translator"))
hcd->has_tt = 1;
if (of_property_read_bool(dev->dev.of_node,
"rockchip-relinquish-port"))
ehci_platform_hc_driver.relinquish_port =
ehci_rockchip_relinquish_port;
priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
"phys", "#phy-cells");