diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci-hub.c | 42 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.c | 121 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 6 |
3 files changed, 169 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 74bfc86..d5eb357 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -493,11 +493,48 @@ static void xhci_hub_report_link_state(u32 *status, u32 status_reg) * when this bit is set. */ pls |= USB_PORT_STAT_CONNECTION; + } else { + /* + * If CAS bit isn't set but the Port is already at + * Compliance Mode, fake a connection so the USB core + * notices the Compliance state and resets the port. + * This resolves an issue generated by the SN65LVPE502CP + * in which sometimes the port enters compliance mode + * caused by a delay on the host-device negotiation. + */ + if (pls == USB_SS_PORT_LS_COMP_MOD) + pls |= USB_PORT_STAT_CONNECTION; } + /* update status field */ *status |= pls; } +/* + * Function for Compliance Mode Quirk. + * + * This Function verifies if all xhc USB3 ports have entered U0, if so, + * the compliance mode timer is deleted. A port won't enter + * compliance mode if it has previously entered U0. + */ +void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status, u16 wIndex) +{ + u32 all_ports_seen_u0 = ((1 << xhci->num_usb3_ports)-1); + bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0); + + if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK)) + return; + + if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) { + xhci->port_status_u0 |= 1 << wIndex; + if (xhci->port_status_u0 == all_ports_seen_u0) { + del_timer_sync(&xhci->comp_mode_recovery_timer); + xhci_dbg(xhci, "All USB3 ports have entered U0 already!\n"); + xhci_dbg(xhci, "Compliance Mode Recovery Timer Deleted.\n"); + } + } +} + int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength) { @@ -651,6 +688,11 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, /* Update Port Link State for super speed ports*/ if (hcd->speed == HCD_USB3) { xhci_hub_report_link_state(&status, temp); + /* + * Verify if all USB3 Ports Have entered U0 already. + * Delete Compliance Mode Timer if so. + */ + xhci_del_comp_mod_timer(xhci, temp, wIndex); } if (bus_state->port_c_suspend & (1 << wIndex)) status |= 1 << USB_PORT_FEAT_C_SUSPEND; diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 617b0a7..6ece0ed 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -26,6 +26,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/slab.h> +#include <linux/dmi.h> #include "xhci.h" @@ -398,6 +399,95 @@ static void xhci_msix_sync_irqs(struct xhci_hcd *xhci) #endif +static void compliance_mode_recovery(unsigned long arg) +{ + struct xhci_hcd *xhci; + struct usb_hcd *hcd; + u32 temp; + int i; + + xhci = (struct xhci_hcd *)arg; + + for (i = 0; i < xhci->num_usb3_ports; i++) { + temp = xhci_readl(xhci, xhci->usb3_ports[i]); + if ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD) { + /* + * Compliance Mode Detected. Letting USB Core + * handle the Warm Reset + */ + xhci_dbg(xhci, "Compliance Mode Detected->Port %d!\n", + i + 1); + xhci_dbg(xhci, "Attempting Recovery routine!\n"); + hcd = xhci->shared_hcd; + + if (hcd->state == HC_STATE_SUSPENDED) + usb_hcd_resume_root_hub(hcd); + + usb_hcd_poll_rh_status(hcd); + } + } + + if (xhci->port_status_u0 != ((1 << xhci->num_usb3_ports)-1)) + mod_timer(&xhci->comp_mode_recovery_timer, + jiffies + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS)); +} + +/* + * Quirk to work around issue generated by the SN65LVPE502CP USB3.0 re-driver + * that causes ports behind that hardware to enter compliance mode sometimes. + * The quirk creates a timer that polls every 2 seconds the link state of + * each host controller's port and recovers it by issuing a Warm reset + * if Compliance mode is detected, otherwise the port will become "dead" (no + * device connections or disconnections will be detected anymore). Becasue no + * status event is generated when entering compliance mode (per xhci spec), + * this quirk is needed on systems that have the failing hardware installed. + */ +static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci) +{ + xhci->port_status_u0 = 0; + init_timer(&xhci->comp_mode_recovery_timer); + + xhci->comp_mode_recovery_timer.data = (unsigned long) xhci; + xhci->comp_mode_recovery_timer.function = compliance_mode_recovery; + xhci->comp_mode_recovery_timer.expires = jiffies + + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS); + + set_timer_slack(&xhci->comp_mode_recovery_timer, + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS)); + add_timer(&xhci->comp_mode_recovery_timer); + xhci_dbg(xhci, "Compliance Mode Recovery Timer Initialized.\n"); +} + +/* + * This function identifies the systems that have installed the SN65LVPE502CP + * USB3.0 re-driver and that need the Compliance Mode Quirk. + * Systems: + * Vendor: Hewlett-Packard -> System Models: Z420, Z620 and Z820 + */ +static bool compliance_mode_recovery_timer_quirk_check(void) +{ + const char *dmi_product_name, *dmi_sys_vendor; + + dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME); + dmi_sys_vendor = dmi_get_system_info(DMI_SYS_VENDOR); + + if (!(strstr(dmi_sys_vendor, "Hewlett-Packard"))) + return false; + + if (strstr(dmi_product_name, "Z420") || + strstr(dmi_product_name, "Z620") || + strstr(dmi_product_name, "Z820")) + return true; + + return false; +} + +static int xhci_all_ports_seen_u0(struct xhci_hcd *xhci) +{ + return (xhci->port_status_u0 == ((1 << xhci->num_usb3_ports)-1)); +} + + /* * Initialize memory for HCD and xHC (one-time init). * @@ -421,6 +511,12 @@ int xhci_init(struct usb_hcd *hcd) retval = xhci_mem_init(xhci, GFP_KERNEL); xhci_dbg(xhci, "Finished xhci_init\n"); + /* Initializing Compliance Mode Recovery Data If Needed */ + if (compliance_mode_recovery_timer_quirk_check()) { + xhci->quirks |= XHCI_COMP_MODE_QUIRK; + compliance_mode_recovery_timer_init(xhci); + } + return retval; } @@ -629,6 +725,11 @@ void xhci_stop(struct usb_hcd *hcd) del_timer_sync(&xhci->event_ring_timer); #endif + /* Deleting Compliance Mode Recovery Timer */ + if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + (!(xhci_all_ports_seen_u0(xhci)))) + del_timer_sync(&xhci->comp_mode_recovery_timer); + if (xhci->quirks & XHCI_AMD_PLL_FIX) usb_amd_dev_put(); @@ -806,6 +907,16 @@ int xhci_suspend(struct xhci_hcd *xhci) } spin_unlock_irq(&xhci->lock); + /* + * Deleting Compliance Mode Recovery Timer because the xHCI Host + * is about to be suspended. + */ + if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + (!(xhci_all_ports_seen_u0(xhci)))) { + del_timer_sync(&xhci->comp_mode_recovery_timer); + xhci_dbg(xhci, "Compliance Mode Recovery Timer Deleted!\n"); + } + /* step 5: remove core well power */ /* synchronize irq when using MSI-X */ xhci_msix_sync_irqs(xhci); @@ -938,6 +1049,16 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) usb_hcd_resume_root_hub(hcd); usb_hcd_resume_root_hub(xhci->shared_hcd); } + + /* + * If system is subject to the Quirk, Compliance Mode Timer needs to + * be re-initialized Always after a system resume. Ports are subject + * to suffer the Compliance Mode issue again. It doesn't matter if + * ports have entered previously to U0 before system's suspension. + */ + if (xhci->quirks & XHCI_COMP_MODE_QUIRK) + compliance_mode_recovery_timer_init(xhci); + return retval; } #endif /* CONFIG_PM */ diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index c713256..1a05908 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1495,6 +1495,7 @@ struct xhci_hcd { #define XHCI_LPM_SUPPORT (1 << 11) #define XHCI_INTEL_HOST (1 << 12) #define XHCI_SPURIOUS_REBOOT (1 << 13) +#define XHCI_COMP_MODE_QUIRK (1 << 14) unsigned int num_active_eps; unsigned int limit_active_eps; /* There are two roothubs to keep track of bus suspend info for */ @@ -1511,6 +1512,11 @@ struct xhci_hcd { unsigned sw_lpm_support:1; /* support xHCI 1.0 spec USB2 hardware LPM */ unsigned hw_lpm_support:1; + /* Compliance Mode Recovery Data */ + struct timer_list comp_mode_recovery_timer; + u32 port_status_u0; +/* Compliance Mode Timer Triggered every 2 seconds */ +#define COMP_MODE_RCVRY_MSECS 2000 }; /* convert between an HCD pointer and the corresponding EHCI_HCD */ |
