From: Peng Fan peng.fan@nxp.com
When moving to support partition reboot or android auto on XEN, linux kernel will runs into runtime suspend state, and the usb will be configured to low power suspend state by Linux.
Then we reboot and runs into U-Boot, however the usb already in suspended state and uboot not able to lock the phy pll, after clearing PHCD to out of suspended state, the phy pll could be locked and fastboot works.
Suggested-by: Li Jun jun.li@nxp.com Reviewed-by: Ye Li ye.li@nxp.com Signed-off-by: Peng Fan peng.fan@nxp.com --- drivers/usb/host/ehci-mx6.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c index ca015ef2f3..de0b0c3156 100644 --- a/drivers/usb/host/ehci-mx6.c +++ b/drivers/usb/host/ehci-mx6.c @@ -414,10 +414,17 @@ int __weak board_ehci_power(int port, int on) int ehci_mx6_common_init(struct usb_ehci *ehci, int index) { int ret; + u32 portsc;
enable_usboh3_clk(1); mdelay(1);
+ portsc = readl(&ehci->portsc); + if (portsc & PORT_PTS_PHCD) { + debug("suspended: portsc %x, enabled it.\n", portsc); + clrbits_le32(&ehci->portsc, PORT_PTS_PHCD); + } + /* Do board specific initialization */ ret = board_ehci_hcd_init(index); if (ret)