From c19dffc0a9511a7d7493ec21019aefd97e9a111b Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Mon, 17 Jun 2019 09:49:07 +0800 Subject: usb: chipidea: udc: workaround for endpoint conflict issue An endpoint conflict occurs when the USB is working in device mode during an isochronous communication. When the endpointA IN direction is an isochronous IN endpoint, and the host sends an IN token to endpointA on another device, then the OUT transaction may be missed regardless the OUT endpoint number. Generally, this occurs when the device is connected to the host through a hub and other devices are connected to the same hub. The affected OUT endpoint can be either control, bulk, isochronous, or an interrupt endpoint. After the OUT endpoint is primed, if an IN token to the same endpoint number on another device is received, then the OUT endpoint may be unprimed (cannot be detected by software), which causes this endpoint to no longer respond to the host OUT token, and thus, no corresponding interrupt occurs. There is no good workaround for this issue, the only thing the software could do is numbering isochronous IN from the highest endpoint since we have observed most of device number endpoint from the lowest. Cc: #v3.14+ Cc: Fabio Estevam Cc: Greg KH Cc: Sergei Shtylyov Cc: Jun Li Signed-off-by: Peter Chen Signed-off-by: Greg Kroah-Hartman --- drivers/usb/chipidea/udc.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index 829e947cabf5..6a5ee8e6da10 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -1622,6 +1622,25 @@ static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on) static int ci_udc_start(struct usb_gadget *gadget, struct usb_gadget_driver *driver); static int ci_udc_stop(struct usb_gadget *gadget); + +/* Match ISOC IN from the highest endpoint */ +static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget, + struct usb_endpoint_descriptor *desc, + struct usb_ss_ep_comp_descriptor *comp_desc) +{ + struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); + struct usb_ep *ep; + + if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) { + list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) { + if (ep->caps.dir_in && !ep->claimed) + return ep; + } + } + + return NULL; +} + /** * Device operations part of the API to the USB controller hardware, * which don't involve endpoints (or i/o) @@ -1635,6 +1654,7 @@ static const struct usb_gadget_ops usb_gadget_ops = { .vbus_draw = ci_udc_vbus_draw, .udc_start = ci_udc_start, .udc_stop = ci_udc_stop, + .match_ep = ci_udc_match_ep, }; static int init_eps(struct ci_hdrc *ci) -- cgit v1.2.3 From 42de8afc40c97002fceb500e2331f6a722be3c14 Mon Sep 17 00:00:00 2001 From: Jules Maselbas Date: Thu, 9 May 2019 11:15:28 +0200 Subject: usb: dwc2: Use generic PHY width in params setup Setting params.phy_utmi_width in dwc2_lowlevel_hw_init() is pointless since it's value will be overwritten by dwc2_init_params(). This change make sure to take in account the generic PHY width information during paraminitialisation, done in dwc2_set_param_phy_utmi_width(). By doing so, the phy_utmi_width params can still be overrided by devicetree specific params and will also be checked against hardware capabilities. Fixes: 707d80f0a3c5 ("usb: dwc2: gadget: Replace phyif with phy_utmi_width") Acked-by: Minas Harutyunyan Tested-by: Marek Szyprowski Signed-off-by: Jules Maselbas Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/params.c | 9 +++++++++ drivers/usb/dwc2/platform.c | 9 --------- 2 files changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index 6900eea57526..5949262ff669 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -253,6 +253,15 @@ static void dwc2_set_param_phy_utmi_width(struct dwc2_hsotg *hsotg) val = (hsotg->hw_params.utmi_phy_data_width == GHWCFG4_UTMI_PHY_DATA_WIDTH_8) ? 8 : 16; + if (hsotg->phy) { + /* + * If using the generic PHY framework, check if the PHY bus + * width is 8-bit and set the phyif appropriately. + */ + if (phy_get_bus_width(hsotg->phy) == 8) + val = 8; + } + hsotg->params.phy_utmi_width = val; } diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index d10a7f8daec3..e98d7812da2d 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -271,15 +271,6 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg) hsotg->plat = dev_get_platdata(hsotg->dev); - if (hsotg->phy) { - /* - * If using the generic PHY framework, check if the PHY bus - * width is 8-bit and set the phyif appropriately. - */ - if (phy_get_bus_width(hsotg->phy) == 8) - hsotg->params.phy_utmi_width = 8; - } - /* Clock */ hsotg->clk = devm_clk_get_optional(hsotg->dev, "otg"); if (IS_ERR(hsotg->clk)) { -- cgit v1.2.3 From b8c3b718087bf7c3c8e388eb1f72ac1108a4926e Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Tue, 18 Jun 2019 17:27:47 +0300 Subject: usb: xhci: Don't try to recover an endpoint if port is in error state. A USB3 device needs to be reset and re-enumarated if the port it connects to goes to a error state, with link state inactive. There is no use in trying to recover failed transactions by resetting endpoints at this stage. Tests show that in rare cases, after multiple endpoint resets of a roothub port the whole host controller might stop completely. Several retries to recover from transaction error can happen as it can take a long time before the hub thread discovers the USB3 port error and inactive link. We can't reliably detect the port error from slot or endpoint context due to a limitation in xhci, see xhci specs section 4.8.3: "There are several cases where the EP State field in the Output Endpoint Context may not reflect the current state of an endpoint" and "Software should maintain an accurate value for EP State, by tracking it with an internal variable that is driven by Events and Doorbell accesses" Same appears to be true for slot state. set a flag to the corresponding slot if a USB3 roothub port link goes inactive to prevent both queueing new URBs and resetting endpoints. Reported-by: Rapolu Chiranjeevi Tested-by: Rapolu Chiranjeevi Cc: Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 15 ++++++++++++++- drivers/usb/host/xhci.c | 5 +++++ drivers/usb/host/xhci.h | 9 +++++++++ 3 files changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index feffceb31e8a..121782e22c01 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1612,8 +1612,13 @@ static void handle_port_status(struct xhci_hcd *xhci, usb_hcd_resume_root_hub(hcd); } - if (hcd->speed >= HCD_USB3 && (portsc & PORT_PLS_MASK) == XDEV_INACTIVE) + if (hcd->speed >= HCD_USB3 && + (portsc & PORT_PLS_MASK) == XDEV_INACTIVE) { + slot_id = xhci_find_slot_id_by_port(hcd, xhci, hcd_portnum + 1); + if (slot_id && xhci->devs[slot_id]) + xhci->devs[slot_id]->flags |= VDEV_PORT_ERROR; bus_state->port_remote_wakeup &= ~(1 << hcd_portnum); + } if ((portsc & PORT_PLC) && (portsc & PORT_PLS_MASK) == XDEV_RESUME) { xhci_dbg(xhci, "port resume event for port %d\n", port_id); @@ -1801,6 +1806,14 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, { struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; struct xhci_command *command; + + /* + * Avoid resetting endpoint if link is inactive. Can cause host hang. + * Device will be reset soon to recover the link so don't do anything + */ + if (xhci->devs[slot_id]->flags & VDEV_PORT_ERROR) + return; + command = xhci_alloc_command(xhci, false, GFP_ATOMIC); if (!command) return; diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 20db378a6012..78a2a937dd83 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1466,6 +1466,10 @@ static int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag xhci_dbg(xhci, "urb submitted during PCI suspend\n"); return -ESHUTDOWN; } + if (xhci->devs[slot_id]->flags & VDEV_PORT_ERROR) { + xhci_dbg(xhci, "Can't queue urb, port error, link inactive\n"); + return -ENODEV; + } if (usb_endpoint_xfer_isoc(&urb->ep->desc)) num_tds = urb->number_of_packets; @@ -3754,6 +3758,7 @@ static int xhci_discover_or_reset_device(struct usb_hcd *hcd, } /* If necessary, update the number of active TTs on this root port */ xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps); + virt_dev->flags = 0; ret = 0; command_cleanup: diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 7f8b950d1a73..92e764c54154 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1010,6 +1010,15 @@ struct xhci_virt_device { u8 real_port; struct xhci_interval_bw_table *bw_table; struct xhci_tt_bw_info *tt_info; + /* + * flags for state tracking based on events and issued commands. + * Software can not rely on states from output contexts because of + * latency between events and xHC updating output context values. + * See xhci 1.1 section 4.8.3 for more details + */ + unsigned long flags; +#define VDEV_PORT_ERROR BIT(0) /* Port error, link inactive */ + /* The current max exit latency for the enabled USB3 link states. */ u16 current_mel; /* Used for the debugfs interfaces. */ -- cgit v1.2.3 From ddd57980a0fde30f7b5d14b888a2cc84d01610e8 Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Tue, 18 Jun 2019 17:27:48 +0300 Subject: xhci: detect USB 3.2 capable host controllers correctly USB 3.2 capability in a host can be detected from the xHCI Supported Protocol Capability major and minor revision fields. If major is 0x3 and minor 0x20 then the host is USB 3.2 capable. For USB 3.2 capable hosts set the root hub lane count to 2. The Major Revision and Minor Revision fields contain a BCD version number. The value of the Major Revision field is JJh and the value of the Minor Revision field is MNh for version JJ.M.N, where JJ = major revision number, M - minor version number, N = sub-minor version number, e.g. version 3.1 is represented with a value of 0310h. Also fix the extra whitespace printed out when announcing regular SuperSpeed hosts. Cc: # v4.18+ Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 78a2a937dd83..3f79f35d0b19 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -5065,16 +5065,26 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) } else { /* * Some 3.1 hosts return sbrn 0x30, use xhci supported protocol - * minor revision instead of sbrn + * minor revision instead of sbrn. Minor revision is a two digit + * BCD containing minor and sub-minor numbers, only show minor. */ - minor_rev = xhci->usb3_rhub.min_rev; - if (minor_rev) { + minor_rev = xhci->usb3_rhub.min_rev / 0x10; + + switch (minor_rev) { + case 2: + hcd->speed = HCD_USB32; + hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS; + hcd->self.root_hub->rx_lanes = 2; + hcd->self.root_hub->tx_lanes = 2; + break; + case 1: hcd->speed = HCD_USB31; hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS; + break; } - xhci_info(xhci, "Host supports USB 3.%x %s SuperSpeed\n", + xhci_info(xhci, "Host supports USB 3.%x %sSuperSpeed\n", minor_rev, - minor_rev ? "Enhanced" : ""); + minor_rev ? "Enhanced " : ""); xhci->usb3_rhub.hcd = hcd; /* xHCI private pointer was set in xhci_pci_probe for the second -- cgit v1.2.3