From: Alan Stern Date: Mon, 18 Mar 2013 16:05:42 +0000 (-0400) Subject: USB: EHCI: don't turn on PORT_SUSPEND during port resume X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=24b90814fb133bb7971aef8ea5e642d9f9bc4b0b;p=linux-beck.git USB: EHCI: don't turn on PORT_SUSPEND during port resume This patch (as1637) cleans up the way ehci-hcd handles end-of-resume port signalling. When the PORT_RESUME bit in the port's status and control register is cleared, we shouldn't be setting the PORT_SUSPEND bit at the same time. Not doing this doesn't seem to have hurt so far, but we might as well do the right thing. Also, the patch replaces an estimated value for what the port status should be following a resume with the actual register value. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 576b735f49b6..0df45d933a10 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -464,7 +464,7 @@ static int ehci_bus_resume (struct usb_hcd *hcd) while (i--) { temp = ehci_readl(ehci, &ehci->regs->port_status [i]); if (test_bit(i, &resume_needed)) { - temp &= ~(PORT_RWC_BITS | PORT_RESUME); + temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME); ehci_writel(ehci, temp, &ehci->regs->port_status [i]); ehci_vdbg (ehci, "resumed port %d\n", i + 1); } @@ -871,10 +871,9 @@ static int ehci_hub_control ( usb_hcd_end_port_resume(&hcd->self, wIndex); /* stop resume signaling */ - temp = ehci_readl(ehci, status_reg); - ehci_writel(ehci, - temp & ~(PORT_RWC_BITS | PORT_RESUME), - status_reg); + temp &= ~(PORT_RWC_BITS | + PORT_SUSPEND | PORT_RESUME); + ehci_writel(ehci, temp, status_reg); clear_bit(wIndex, &ehci->resuming_ports); retval = handshake(ehci, status_reg, PORT_RESUME, 0, 2000 /* 2msec */); @@ -884,7 +883,7 @@ static int ehci_hub_control ( wIndex + 1, retval); goto error; } - temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); + temp = ehci_readl(ehci, status_reg); } }