From stern@rowland.harvard.edu Thu Jan 25 13:15:01 2007 From: Alan Stern Date: Mon, 22 Jan 2007 16:08:53 -0500 (EST) Subject: EHCI: fix interrupt-driven remote wakeup To: Greg KH Cc: David Brownell , Marcelo Tosatti Message-ID: Now that port status change notifications are interrupt-driven, ehci-hcd needs to tell usbcore when a remote-wakeup resume operation is finished -- we can no longer rely on the core to poll and find out. This patch (as843) uses the root-hub status timer to force a poll after the resume is complete. The patch also changes the test for detecting when the TDRSMDN resume period has expired. It's necessary to use time_after_eq() instead of time_after(), since the polling is triggered precisely by a timer. The same change is made for TDRSTR reset expiration, for consistency. Signed-off-by: Alan Stern Cc: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hub.c | 50 ++++++++++++++++++++++++++++---------------- 1 file changed, 32 insertions(+), 18 deletions(-) --- gregkh-2.6.orig/drivers/usb/host/ehci-hub.c +++ gregkh-2.6/drivers/usb/host/ehci-hub.c @@ -379,8 +379,8 @@ ehci_hub_status_data (struct usb_hcd *hc ehci->reset_done [i] = 0; if ((temp & mask) != 0 || ((temp & PORT_RESUME) != 0 - && time_after (jiffies, - ehci->reset_done [i]))) { + && time_after_eq(jiffies, + ehci->reset_done[i]))) { if (i < 7) buf [0] |= 1 << (i + 1); else @@ -554,31 +554,45 @@ static int ehci_hub_control ( status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT; /* whoever resumes must GetPortStatus to complete it!! */ - if ((temp & PORT_RESUME) - && time_after (jiffies, - ehci->reset_done [wIndex])) { - status |= 1 << USB_PORT_FEAT_C_SUSPEND; - ehci->reset_done [wIndex] = 0; + if (temp & PORT_RESUME) { - /* stop resume signaling */ - temp = ehci_readl(ehci, status_reg); - ehci_writel(ehci, + /* Remote Wakeup received? */ + if (!ehci->reset_done[wIndex]) { + /* resume signaling for 20 msec */ + ehci->reset_done[wIndex] = jiffies + + msecs_to_jiffies(20); + /* check the port again */ + mod_timer(&ehci_to_hcd(ehci)->rh_timer, + ehci->reset_done[wIndex]); + } + + /* resume completed? */ + else if (time_after_eq(jiffies, + ehci->reset_done[wIndex])) { + status |= 1 << USB_PORT_FEAT_C_SUSPEND; + ehci->reset_done[wIndex] = 0; + + /* stop resume signaling */ + temp = ehci_readl(ehci, status_reg); + ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESUME), status_reg); - retval = handshake(ehci, status_reg, + retval = handshake(ehci, status_reg, PORT_RESUME, 0, 2000 /* 2msec */); - if (retval != 0) { - ehci_err (ehci, "port %d resume error %d\n", - wIndex + 1, retval); - goto error; + if (retval != 0) { + ehci_err(ehci, + "port %d resume error %d\n", + wIndex + 1, retval); + goto error; + } + temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); } - temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); } /* whoever resets must GetPortStatus to complete it!! */ if ((temp & PORT_RESET) - && time_after (jiffies, - ehci->reset_done [wIndex])) { + && time_after_eq(jiffies, + ehci->reset_done[wIndex])) { status |= 1 << USB_PORT_FEAT_C_RESET; ehci->reset_done [wIndex] = 0;