Some XHCI controllers may not have any USB 3.0 port, in this case, it is not useful to create add hcd->shared_hcd, which has 2 main downsides: - A useless USB 3.0 root hub is created. - A warning is thrown on boot: hub 2-0:1.0: config failed, hub doesn't have any ports! (err -19) The change is mostly about checking if hcd->shared_hcd is NULL before accessing it. The one special case is in xhci_run, where we need to call xhci_run_finished immediately, if there is no secondary hcd. Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx> --- This is a respin of https://lore.kernel.org/patchwork/patch/863993/, hopefully addressing the comments there. Note that I dropped the change in xhci-plat.c, as I do not have a device to test it, but made a similar change in xhci-mtk.c, in the next patch. (the @apm.com addresses seem to bounce, so I added some @amperecomputing.com instead, if somebody there can track back the original issue, I'm happy to provide a patch for xhci-plat.c as well) drivers/usb/host/xhci-hub.c | 7 ++++-- drivers/usb/host/xhci.c | 45 +++++++++++++++++++++++++++---------- 2 files changed, 38 insertions(+), 14 deletions(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 3abe70ff1b1e2af..9a9c5a63ae57c6d 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -627,8 +627,11 @@ static int xhci_enter_test_mode(struct xhci_hcd *xhci, /* Put all ports to the Disable state by clear PP */ xhci_dbg(xhci, "Disable all port (PP = 0)\n"); /* Power off USB3 ports*/ - for (i = 0; i < xhci->usb3_rhub.num_ports; i++) - xhci_set_port_power(xhci, xhci->shared_hcd, i, false, flags); + if (xhci->shared_hcd) { + for (i = 0; i < xhci->usb3_rhub.num_ports; i++) + xhci_set_port_power(xhci, xhci->shared_hcd, i, false, + flags); + } /* Power off USB2 ports*/ for (i = 0; i < xhci->usb2_rhub.num_ports; i++) xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags); diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index a9bb796794e3937..a2cf715c53f2164 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -523,6 +523,10 @@ static void compliance_mode_recovery(struct timer_list *t) */ static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci) { + /* No compliance mode recovery needed if there is no USB 3.0 hcd. */ + if (!xhci->shared_hcd) + return; + xhci->port_status_u0 = 0; timer_setup(&xhci->comp_mode_recovery_timer, compliance_mode_recovery, 0); @@ -610,7 +614,8 @@ static int xhci_run_finished(struct xhci_hcd *xhci) xhci_halt(xhci); return -ENODEV; } - xhci->shared_hcd->state = HC_STATE_RUNNING; + if (xhci->shared_hcd) + xhci->shared_hcd->state = HC_STATE_RUNNING; xhci->cmd_ring_state = CMD_RING_STATE_RUNNING; if (xhci->quirks & XHCI_NEC_HOST) @@ -698,6 +703,10 @@ int xhci_run(struct usb_hcd *hcd) xhci_debugfs_init(xhci); + /* There is no secondary HCD, start the host controller immediately. */ + if (!xhci->shared_hcd) + return xhci_run_finished(xhci); + return 0; } EXPORT_SYMBOL_GPL(xhci_run); @@ -984,7 +993,8 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) return 0; if (hcd->state != HC_STATE_SUSPENDED || - xhci->shared_hcd->state != HC_STATE_SUSPENDED) + (xhci->shared_hcd && + xhci->shared_hcd->state != HC_STATE_SUSPENDED)) return -EINVAL; xhci_dbc_suspend(xhci); @@ -997,15 +1007,18 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) xhci_dbg(xhci, "%s: stopping port polling.\n", __func__); clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); del_timer_sync(&hcd->rh_timer); - clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); - del_timer_sync(&xhci->shared_hcd->rh_timer); + if (xhci->shared_hcd) { + clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); + del_timer_sync(&xhci->shared_hcd->rh_timer); + } if (xhci->quirks & XHCI_SUSPEND_DELAY) usleep_range(1000, 1500); spin_lock_irq(&xhci->lock); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); + if (xhci->shared_hcd) + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); /* step 1: stop endpoint */ /* skipped assuming that port suspend has done */ @@ -1103,7 +1116,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) msleep(100); set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); + if (xhci->shared_hcd) + set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); spin_lock_irq(&xhci->lock); if ((xhci->quirks & XHCI_RESET_ON_RESUME) || xhci->broken_suspend) @@ -1145,7 +1159,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) /* Let the USB core know _both_ roothubs lost power. */ usb_root_hub_lost_power(xhci->main_hcd->self.root_hub); - usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub); + if (xhci->shared_hcd) + usb_root_hub_lost_power( + xhci->shared_hcd->self.root_hub); xhci_dbg(xhci, "Stop HCD\n"); xhci_halt(xhci); @@ -1185,10 +1201,12 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) retval = xhci_run(hcd->primary_hcd); if (!retval) { xhci_dbg(xhci, "Start the secondary HCD\n"); - retval = xhci_run(secondary_hcd); + if (secondary_hcd) + retval = xhci_run(secondary_hcd); } hcd->state = HC_STATE_SUSPENDED; - xhci->shared_hcd->state = HC_STATE_SUSPENDED; + if (xhci->shared_hcd) + xhci->shared_hcd->state = HC_STATE_SUSPENDED; goto done; } @@ -1216,7 +1234,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) if (retval == 0) { /* Resume root hubs only when have pending events. */ if (xhci_pending_portevent(xhci)) { - usb_hcd_resume_root_hub(xhci->shared_hcd); + if (xhci->shared_hcd) + usb_hcd_resume_root_hub(xhci->shared_hcd); usb_hcd_resume_root_hub(hcd); } } @@ -1235,8 +1254,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) /* Re-enable port polling. */ xhci_dbg(xhci, "%s: starting port polling.\n", __func__); - set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); - usb_hcd_poll_rh_status(xhci->shared_hcd); + if (xhci->shared_hcd) { + set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); + usb_hcd_poll_rh_status(xhci->shared_hcd); + } set_bit(HCD_FLAG_POLL_RH, &hcd->flags); usb_hcd_poll_rh_status(hcd); -- 2.21.0.593.g511ec345e18-goog
