diff options
author | Elson Roy Serrao <quic_eserrao@quicinc.com> | 2023-03-25 00:47:58 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-29 11:27:01 +0300 |
commit | 047161686b813ae9035a3fb342ba8b6932053492 (patch) | |
tree | 1ff19299252f34f20a9ffca8192b8e6caa877333 /drivers/usb/dwc3 | |
parent | b93c2a68f3d9dc98ec30dcb342ae47c1c8d09d18 (diff) | |
download | linux-047161686b813ae9035a3fb342ba8b6932053492.tar.xz |
usb: dwc3: Add remote wakeup handling
An usb device can initate a remote wakeup and bring the link out of
suspend as dictated by the DEVICE_REMOTE_WAKEUP feature selector.
Add support to handle this packet and set the remote wakeup capability.
Some hosts may take longer time to initiate the resume signaling after
device triggers a remote wakeup. So add async support to the wakeup API
by enabling link status change events.
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Elson Roy Serrao <quic_eserrao@quicinc.com>
Link: https://lore.kernel.org/r/1679694482-16430-3-git-send-email-quic_eserrao@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3')
-rw-r--r-- | drivers/usb/dwc3/core.h | 2 | ||||
-rw-r--r-- | drivers/usb/dwc3/ep0.c | 7 | ||||
-rw-r--r-- | drivers/usb/dwc3/gadget.c | 76 |
3 files changed, 79 insertions, 6 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 912208585da2..8541708ed2cb 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1113,6 +1113,7 @@ struct dwc3_scratchpad_array { * 3 - Reserved * @dis_metastability_quirk: set to disable metastability quirk. * @dis_split_quirk: set to disable split boundary. + * @wakeup_configured: set if the device is configured for remote wakeup. * @imod_interval: set the interrupt moderation interval in 250ns * increments or 0 to disable. * @max_cfg_eps: current max number of IN eps used across all USB configs. @@ -1331,6 +1332,7 @@ struct dwc3 { unsigned dis_split_quirk:1; unsigned async_callbacks:1; + unsigned wakeup_configured:1; u16 imod_interval; diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 61de693461da..8aa14a596406 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -356,6 +356,9 @@ static int dwc3_ep0_handle_status(struct dwc3 *dwc, usb_status |= 1 << USB_DEV_STAT_U1_ENABLED; if (reg & DWC3_DCTL_INITU2ENA) usb_status |= 1 << USB_DEV_STAT_U2_ENABLED; + } else { + usb_status |= dwc->gadget->wakeup_armed << + USB_DEVICE_REMOTE_WAKEUP; } break; @@ -476,6 +479,10 @@ static int dwc3_ep0_handle_device(struct dwc3 *dwc, switch (wValue) { case USB_DEVICE_REMOTE_WAKEUP: + if (dwc->wakeup_configured) + dwc->gadget->wakeup_armed = set; + else + ret = -EINVAL; break; /* * 9.4.1 says only for SS, in AddressState only for diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 29f8f9311d77..7ceff08a1b8c 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -258,7 +258,7 @@ int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd, return ret; } -static int __dwc3_gadget_wakeup(struct dwc3 *dwc); +static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async); /** * dwc3_send_gadget_ep_cmd - issue an endpoint command @@ -325,7 +325,7 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, fallthrough; case DWC3_LINK_STATE_U3: - ret = __dwc3_gadget_wakeup(dwc); + ret = __dwc3_gadget_wakeup(dwc, false); dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", ret); break; @@ -2273,6 +2273,22 @@ static const struct usb_ep_ops dwc3_gadget_ep_ops = { /* -------------------------------------------------------------------------- */ +static void dwc3_gadget_enable_linksts_evts(struct dwc3 *dwc, bool set) +{ + u32 reg; + + if (DWC3_VER_IS_PRIOR(DWC3, 250A)) + return; + + reg = dwc3_readl(dwc->regs, DWC3_DEVTEN); + if (set) + reg |= DWC3_DEVTEN_ULSTCNGEN; + else + reg &= ~DWC3_DEVTEN_ULSTCNGEN; + + dwc3_writel(dwc->regs, DWC3_DEVTEN, reg); +} + static int dwc3_gadget_get_frame(struct usb_gadget *g) { struct dwc3 *dwc = gadget_to_dwc(g); @@ -2280,7 +2296,7 @@ static int dwc3_gadget_get_frame(struct usb_gadget *g) return __dwc3_gadget_get_frame(dwc); } -static int __dwc3_gadget_wakeup(struct dwc3 *dwc) +static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async) { int retries; @@ -2311,9 +2327,13 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc) return -EINVAL; } + if (async) + dwc3_gadget_enable_linksts_evts(dwc, true); + ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV); if (ret < 0) { dev_err(dwc->dev, "failed to put link in Recovery\n"); + dwc3_gadget_enable_linksts_evts(dwc, false); return ret; } @@ -2325,6 +2345,13 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_DCTL, reg); } + /* + * Since link status change events are enabled we will receive + * an U0 event when wakeup is successful. So bail out. + */ + if (async) + return 0; + /* poll until Link State changes to ON */ retries = 20000; @@ -2350,13 +2377,36 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) unsigned long flags; int ret; + if (!dwc->wakeup_configured) { + dev_err(dwc->dev, "remote wakeup not configured\n"); + return -EINVAL; + } + spin_lock_irqsave(&dwc->lock, flags); - ret = __dwc3_gadget_wakeup(dwc); + if (!dwc->gadget->wakeup_armed) { + dev_err(dwc->dev, "not armed for remote wakeup\n"); + spin_unlock_irqrestore(&dwc->lock, flags); + return -EINVAL; + } + ret = __dwc3_gadget_wakeup(dwc, true); + spin_unlock_irqrestore(&dwc->lock, flags); return ret; } +static int dwc3_gadget_set_remote_wakeup(struct usb_gadget *g, int set) +{ + struct dwc3 *dwc = gadget_to_dwc(g); + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + dwc->wakeup_configured = !!set; + spin_unlock_irqrestore(&dwc->lock, flags); + + return 0; +} + static int dwc3_gadget_set_selfpowered(struct usb_gadget *g, int is_selfpowered) { @@ -2982,6 +3032,7 @@ static void dwc3_gadget_async_callbacks(struct usb_gadget *g, bool enable) static const struct usb_gadget_ops dwc3_gadget_ops = { .get_frame = dwc3_gadget_get_frame, .wakeup = dwc3_gadget_wakeup, + .set_remote_wakeup = dwc3_gadget_set_remote_wakeup, .set_selfpowered = dwc3_gadget_set_selfpowered, .pullup = dwc3_gadget_pullup, .udc_start = dwc3_gadget_start, @@ -3827,6 +3878,8 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc) dwc->gadget->speed = USB_SPEED_UNKNOWN; dwc->setup_packet_pending = false; + dwc->gadget->wakeup_armed = false; + dwc3_gadget_enable_linksts_evts(dwc, false); usb_gadget_set_state(dwc->gadget, USB_STATE_NOTATTACHED); if (dwc->ep0state != EP0_SETUP_PHASE) { @@ -3920,6 +3973,8 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) reg &= ~DWC3_DCTL_TSTCTRL_MASK; dwc3_gadget_dctl_write_safe(dwc, reg); dwc->test_mode = false; + dwc->gadget->wakeup_armed = false; + dwc3_gadget_enable_linksts_evts(dwc, false); dwc3_clear_stall_all_ep(dwc); /* Reset device address to zero */ @@ -4072,7 +4127,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) */ } -static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc) +static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo) { /* * TODO take core out of low power mode when that's @@ -4084,6 +4139,8 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc) dwc->gadget_driver->resume(dwc->gadget); spin_lock(&dwc->lock); } + + dwc->link_state = evtinfo & DWC3_LINK_STATE_MASK; } static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc, @@ -4165,6 +4222,12 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc, } switch (next) { + case DWC3_LINK_STATE_U0: + if (dwc->gadget->wakeup_armed) { + dwc3_gadget_enable_linksts_evts(dwc, false); + dwc3_resume_gadget(dwc); + } + break; case DWC3_LINK_STATE_U1: if (dwc->speed == USB_SPEED_SUPER) dwc3_suspend_gadget(dwc); @@ -4233,7 +4296,7 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc, dwc3_gadget_conndone_interrupt(dwc); break; case DWC3_DEVICE_EVENT_WAKEUP: - dwc3_gadget_wakeup_interrupt(dwc); + dwc3_gadget_wakeup_interrupt(dwc, event->event_info); break; case DWC3_DEVICE_EVENT_HIBER_REQ: if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation, @@ -4481,6 +4544,7 @@ int dwc3_gadget_init(struct dwc3 *dwc) dwc->gadget->sg_supported = true; dwc->gadget->name = "dwc3-gadget"; dwc->gadget->lpm_capable = !dwc->usb2_gadget_lpm_disable; + dwc->gadget->wakeup_capable = true; /* * FIXME We might be setting max_speed to <SUPER, however versions |