From 75d7cf72ab9fa01dc70877aa5c68e8ef477229dc Mon Sep 17 00:00:00 2001 From: Andiry Xu Date: Tue, 13 Sep 2011 16:41:11 -0700 Subject: [PATCH] usbcore: refine warm reset logic Current waiting time for warm(BH) reset in hub_port_warm_reset() is too short for xHC host to complete the warm reset and report a BH reset change. This patch increases the waiting time for warm reset and merges the function into hub_port_reset(), so it can handle both cold reset and warm reset, and factor out hub_port_finish_reset() to make the code looks cleaner. This fixes the issue that driver fails to clear BH reset change and port is "dead". Signed-off-by: Andiry Xu Acked-by: Alan Stern Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 216 +++++++++++++++++++++-------------------- 1 file changed, 112 insertions(+), 104 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 3edc01bc41f7..aa336f736f0c 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2025,11 +2025,12 @@ static unsigned hub_is_wusb(struct usb_hub *hub) #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ #define HUB_SHORT_RESET_TIME 10 +#define HUB_BH_RESET_TIME 50 #define HUB_LONG_RESET_TIME 200 #define HUB_RESET_TIMEOUT 500 static int hub_port_wait_reset(struct usb_hub *hub, int port1, - struct usb_device *udev, unsigned int delay) + struct usb_device *udev, unsigned int delay, bool warm) { int delay_time, ret; u16 portstatus; @@ -2046,28 +2047,39 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1, if (ret < 0) return ret; - /* Device went away? */ - if (!(portstatus & USB_PORT_STAT_CONNECTION)) - return -ENOTCONN; - - /* bomb out completely if the connection bounced */ - if ((portchange & USB_PORT_STAT_C_CONNECTION)) - return -ENOTCONN; - - /* if we`ve finished resetting, then break out of the loop */ - if (!(portstatus & USB_PORT_STAT_RESET) && - (portstatus & USB_PORT_STAT_ENABLE)) { - if (hub_is_wusb(hub)) - udev->speed = USB_SPEED_WIRELESS; - else if (hub_is_superspeed(hub->hdev)) - udev->speed = USB_SPEED_SUPER; - else if (portstatus & USB_PORT_STAT_HIGH_SPEED) - udev->speed = USB_SPEED_HIGH; - else if (portstatus & USB_PORT_STAT_LOW_SPEED) - udev->speed = USB_SPEED_LOW; - else - udev->speed = USB_SPEED_FULL; - return 0; + /* + * Some buggy devices require a warm reset to be issued even + * when the port appears not to be connected. + */ + if (!warm) { + /* Device went away? */ + if (!(portstatus & USB_PORT_STAT_CONNECTION)) + return -ENOTCONN; + + /* bomb out completely if the connection bounced */ + if ((portchange & USB_PORT_STAT_C_CONNECTION)) + return -ENOTCONN; + + /* if we`ve finished resetting, then break out of + * the loop + */ + if (!(portstatus & USB_PORT_STAT_RESET) && + (portstatus & USB_PORT_STAT_ENABLE)) { + if (hub_is_wusb(hub)) + udev->speed = USB_SPEED_WIRELESS; + else if (hub_is_superspeed(hub->hdev)) + udev->speed = USB_SPEED_SUPER; + else if (portstatus & USB_PORT_STAT_HIGH_SPEED) + udev->speed = USB_SPEED_HIGH; + else if (portstatus & USB_PORT_STAT_LOW_SPEED) + udev->speed = USB_SPEED_LOW; + else + udev->speed = USB_SPEED_FULL; + return 0; + } + } else { + if (portchange & USB_PORT_STAT_C_BH_RESET) + return 0; } /* switch to the long delay after two short delay failures */ @@ -2075,35 +2087,84 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1, delay = HUB_LONG_RESET_TIME; dev_dbg (hub->intfdev, - "port %d not reset yet, waiting %dms\n", - port1, delay); + "port %d not %sreset yet, waiting %dms\n", + port1, warm ? "warm " : "", delay); } return -EBUSY; } +static void hub_port_finish_reset(struct usb_hub *hub, int port1, + struct usb_device *udev, int *status, bool warm) +{ + switch (*status) { + case 0: + if (!warm) { + struct usb_hcd *hcd; + /* TRSTRCY = 10 ms; plus some extra */ + msleep(10 + 40); + update_devnum(udev, 0); + hcd = bus_to_hcd(udev->bus); + if (hcd->driver->reset_device) { + *status = hcd->driver->reset_device(hcd, udev); + if (*status < 0) { + dev_err(&udev->dev, "Cannot reset " + "HCD device state\n"); + break; + } + } + } + /* FALL THROUGH */ + case -ENOTCONN: + case -ENODEV: + clear_port_feature(hub->hdev, + port1, USB_PORT_FEAT_C_RESET); + /* FIXME need disconnect() for NOTATTACHED device */ + if (warm) { + clear_port_feature(hub->hdev, port1, + USB_PORT_FEAT_C_BH_PORT_RESET); + clear_port_feature(hub->hdev, port1, + USB_PORT_FEAT_C_PORT_LINK_STATE); + } else { + usb_set_device_state(udev, *status + ? USB_STATE_NOTATTACHED + : USB_STATE_DEFAULT); + } + break; + } +} + +/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ static int hub_port_reset(struct usb_hub *hub, int port1, - struct usb_device *udev, unsigned int delay) + struct usb_device *udev, unsigned int delay, bool warm) { int i, status; - struct usb_hcd *hcd; - hcd = bus_to_hcd(udev->bus); - /* Block EHCI CF initialization during the port reset. - * Some companion controllers don't like it when they mix. - */ - down_read(&ehci_cf_port_reset_rwsem); + if (!warm) { + /* Block EHCI CF initialization during the port reset. + * Some companion controllers don't like it when they mix. + */ + down_read(&ehci_cf_port_reset_rwsem); + } else { + if (!hub_is_superspeed(hub->hdev)) { + dev_err(hub->intfdev, "only USB3 hub support " + "warm reset\n"); + return -EINVAL; + } + } /* Reset the port */ for (i = 0; i < PORT_RESET_TRIES; i++) { - status = set_port_feature(hub->hdev, - port1, USB_PORT_FEAT_RESET); - if (status) + status = set_port_feature(hub->hdev, port1, (warm ? + USB_PORT_FEAT_BH_PORT_RESET : + USB_PORT_FEAT_RESET)); + if (status) { dev_err(hub->intfdev, - "cannot reset port %d (err = %d)\n", - port1, status); - else { - status = hub_port_wait_reset(hub, port1, udev, delay); + "cannot %sreset port %d (err = %d)\n", + warm ? "warm " : "", port1, status); + } else { + status = hub_port_wait_reset(hub, port1, udev, delay, + warm); if (status && status != -ENOTCONN) dev_dbg(hub->intfdev, "port_wait_reset: err = %d\n", @@ -2111,34 +2172,14 @@ static int hub_port_reset(struct usb_hub *hub, int port1, } /* return on disconnect or reset */ - switch (status) { - case 0: - /* TRSTRCY = 10 ms; plus some extra */ - msleep(10 + 40); - update_devnum(udev, 0); - if (hcd->driver->reset_device) { - status = hcd->driver->reset_device(hcd, udev); - if (status < 0) { - dev_err(&udev->dev, "Cannot reset " - "HCD device state\n"); - break; - } - } - /* FALL THROUGH */ - case -ENOTCONN: - case -ENODEV: - clear_port_feature(hub->hdev, - port1, USB_PORT_FEAT_C_RESET); - /* FIXME need disconnect() for NOTATTACHED device */ - usb_set_device_state(udev, status - ? USB_STATE_NOTATTACHED - : USB_STATE_DEFAULT); + if (status == 0 || status == -ENOTCONN || status == -ENODEV) { + hub_port_finish_reset(hub, port1, udev, &status, warm); goto done; } dev_dbg (hub->intfdev, - "port %d not enabled, trying reset again...\n", - port1); + "port %d not enabled, trying %sreset again...\n", + port1, warm ? "warm " : ""); delay = HUB_LONG_RESET_TIME; } @@ -2146,45 +2187,11 @@ static int hub_port_reset(struct usb_hub *hub, int port1, "Cannot enable port %i. Maybe the USB cable is bad?\n", port1); - done: - up_read(&ehci_cf_port_reset_rwsem); - return status; -} - -/* Warm reset a USB3 protocol port */ -static int hub_port_warm_reset(struct usb_hub *hub, int port) -{ - int ret; - u16 portstatus, portchange; - - if (!hub_is_superspeed(hub->hdev)) { - dev_err(hub->intfdev, "only USB3 hub support warm reset\n"); - return -EINVAL; - } - - /* Warm reset the port */ - ret = set_port_feature(hub->hdev, - port, USB_PORT_FEAT_BH_PORT_RESET); - if (ret) { - dev_err(hub->intfdev, "cannot warm reset port %d\n", port); - return ret; - } - - msleep(20); - ret = hub_port_status(hub, port, &portstatus, &portchange); - - if (portchange & USB_PORT_STAT_C_RESET) - clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET); - - if (portchange & USB_PORT_STAT_C_BH_RESET) - clear_port_feature(hub->hdev, port, - USB_PORT_FEAT_C_BH_PORT_RESET); - - if (portchange & USB_PORT_STAT_C_LINK_STATE) - clear_port_feature(hub->hdev, port, - USB_PORT_FEAT_C_PORT_LINK_STATE); +done: + if (!warm) + up_read(&ehci_cf_port_reset_rwsem); - return ret; + return status; } /* Check if a port is power on */ @@ -2814,7 +2821,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, /* Reset the device; full speed may morph to high speed */ /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ - retval = hub_port_reset(hub, port1, udev, delay); + retval = hub_port_reset(hub, port1, udev, delay, false); if (retval < 0) /* error or disconnect */ goto fail; /* success, speed is known */ @@ -2935,7 +2942,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, buf->bMaxPacketSize0; kfree(buf); - retval = hub_port_reset(hub, port1, udev, delay); + retval = hub_port_reset(hub, port1, udev, delay, false); if (retval < 0) /* error or disconnect */ goto fail; if (oldspeed != udev->speed) { @@ -3556,7 +3563,8 @@ static void hub_events(void) (portstatus & USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_SS_INACTIVE) { dev_dbg(hub_dev, "warm reset port %d\n", i); - hub_port_warm_reset(hub, i); + hub_port_reset(hub, i, NULL, + HUB_BH_RESET_TIME, true); } if (connect_change) -- 2.30.2