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path: root/drivers/usb/dwc3/gadget.c
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Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
-rw-r--r--drivers/usb/dwc3/gadget.c183
1 files changed, 152 insertions, 31 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2da0a5a2803a..a740eac74d56 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -68,6 +68,22 @@ int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
}
/**
+ * dwc3_gadget_get_link_state - Gets current state of USB Link
+ * @dwc: pointer to our context structure
+ *
+ * Caller should take care of locking. This function will
+ * return the link state on success (>= 0) or -ETIMEDOUT.
+ */
+int dwc3_gadget_get_link_state(struct dwc3 *dwc)
+{
+ u32 reg;
+
+ reg = dwc3_readl(dwc->regs, DWC3_DSTS);
+
+ return DWC3_DSTS_USBLNKST(reg);
+}
+
+/**
* dwc3_gadget_set_link_state - Sets USB Link to a particular State
* @dwc: pointer to our context structure
* @state: the state to put link into
@@ -417,7 +433,7 @@ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
const struct usb_endpoint_descriptor *desc,
const struct usb_ss_ep_comp_descriptor *comp_desc,
- bool ignore)
+ bool ignore, bool restore)
{
struct dwc3_gadget_ep_cmd_params params;
@@ -436,6 +452,11 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
if (ignore)
params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
+ if (restore) {
+ params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
+ params.param2 |= dep->saved_state;
+ }
+
params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
| DWC3_DEPCFG_XFER_NOT_READY_EN;
@@ -494,7 +515,7 @@ static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
const struct usb_endpoint_descriptor *desc,
const struct usb_ss_ep_comp_descriptor *comp_desc,
- bool ignore)
+ bool ignore, bool restore)
{
struct dwc3 *dwc = dep->dwc;
u32 reg;
@@ -508,7 +529,8 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
return ret;
}
- ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore);
+ ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
+ restore);
if (ret)
return ret;
@@ -548,13 +570,13 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
return 0;
}
-static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
+static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
{
struct dwc3_request *req;
if (!list_empty(&dep->req_queued)) {
- dwc3_stop_active_transfer(dwc, dep->number);
+ dwc3_stop_active_transfer(dwc, dep->number, true);
/* - giveback all requests to gadget driver */
while (!list_empty(&dep->req_queued)) {
@@ -659,7 +681,7 @@ static int dwc3_gadget_ep_enable(struct usb_ep *ep,
}
spin_lock_irqsave(&dwc->lock, flags);
- ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false);
+ ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
@@ -771,9 +793,6 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
else
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
-
- if (!req->request.no_interrupt && !chain)
- trb->ctrl |= DWC3_TRB_CTRL_IOC;
break;
case USB_ENDPOINT_XFER_BULK:
@@ -788,6 +807,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
BUG();
}
+ if (!req->request.no_interrupt && !chain)
+ trb->ctrl |= DWC3_TRB_CTRL_IOC;
+
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
trb->ctrl |= DWC3_TRB_CTRL_CSP;
@@ -1077,7 +1099,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
*/
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
if (list_empty(&dep->req_queued)) {
- dwc3_stop_active_transfer(dwc, dep->number);
+ dwc3_stop_active_transfer(dwc, dep->number, true);
dep->flags = DWC3_EP_ENABLED;
}
return 0;
@@ -1107,6 +1129,23 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
return ret;
}
+ /*
+ * 4. Stream Capable Bulk Endpoints. We need to start the transfer
+ * right away, otherwise host will not know we have streams to be
+ * handled.
+ */
+ if (dep->stream_capable) {
+ int ret;
+
+ ret = __dwc3_gadget_kick_transfer(dep, 0, true);
+ if (ret && ret != -EBUSY) {
+ struct dwc3 *dwc = dep->dwc;
+
+ dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
+ dep->name);
+ }
+ }
+
return 0;
}
@@ -1163,7 +1202,7 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
}
if (r == req) {
/* wait until it is processed */
- dwc3_stop_active_transfer(dwc, dep->number);
+ dwc3_stop_active_transfer(dwc, dep->number, true);
goto out1;
}
dev_err(dwc->dev, "request %p was not queued to %s\n",
@@ -1194,8 +1233,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_SETSTALL, &params);
if (ret)
- dev_err(dwc->dev, "failed to %s STALL on %s\n",
- value ? "set" : "clear",
+ dev_err(dwc->dev, "failed to set STALL on %s\n",
dep->name);
else
dep->flags |= DWC3_EP_STALL;
@@ -1203,8 +1241,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_CLEARSTALL, &params);
if (ret)
- dev_err(dwc->dev, "failed to %s STALL on %s\n",
- value ? "set" : "clear",
+ dev_err(dwc->dev, "failed to clear STALL on %s\n",
dep->name);
else
dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
@@ -1387,7 +1424,7 @@ static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
return 0;
}
-static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
+static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
{
u32 reg;
u32 timeout = 500;
@@ -1402,9 +1439,17 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
if (dwc->revision >= DWC3_REVISION_194A)
reg &= ~DWC3_DCTL_KEEP_CONNECT;
reg |= DWC3_DCTL_RUN_STOP;
+
+ if (dwc->has_hibernation)
+ reg |= DWC3_DCTL_KEEP_CONNECT;
+
dwc->pullups_connected = true;
} else {
reg &= ~DWC3_DCTL_RUN_STOP;
+
+ if (dwc->has_hibernation && !suspend)
+ reg &= ~DWC3_DCTL_KEEP_CONNECT;
+
dwc->pullups_connected = false;
}
@@ -1442,7 +1487,7 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
is_on = !!is_on;
spin_lock_irqsave(&dwc->lock, flags);
- ret = dwc3_gadget_run_stop(dwc, is_on);
+ ret = dwc3_gadget_run_stop(dwc, is_on, false);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
@@ -1549,14 +1594,16 @@ static int dwc3_gadget_start(struct usb_gadget *g,
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
dep = dwc->eps[0];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
+ false);
if (ret) {
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
goto err2;
}
dep = dwc->eps[1];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
+ false);
if (ret) {
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
goto err3;
@@ -1849,15 +1896,12 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
*/
dep->flags = DWC3_EP_PENDING_REQUEST;
} else {
- dwc3_stop_active_transfer(dwc, dep->number);
+ dwc3_stop_active_transfer(dwc, dep->number, true);
dep->flags = DWC3_EP_ENABLED;
}
return 1;
}
- if ((event->status & DEPEVT_STATUS_IOC) &&
- (trb->ctrl & DWC3_TRB_CTRL_IOC))
- return 0;
return 1;
}
@@ -1999,7 +2043,25 @@ static void dwc3_disconnect_gadget(struct dwc3 *dwc)
}
}
-static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
+static void dwc3_suspend_gadget(struct dwc3 *dwc)
+{
+ if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
+ spin_unlock(&dwc->lock);
+ dwc->gadget_driver->suspend(&dwc->gadget);
+ spin_lock(&dwc->lock);
+ }
+}
+
+static void dwc3_resume_gadget(struct dwc3 *dwc)
+{
+ if (dwc->gadget_driver && dwc->gadget_driver->resume) {
+ spin_unlock(&dwc->lock);
+ dwc->gadget_driver->resume(&dwc->gadget);
+ spin_lock(&dwc->lock);
+ }
+}
+
+static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
{
struct dwc3_ep *dep;
struct dwc3_gadget_ep_cmd_params params;
@@ -2031,7 +2093,8 @@ static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
*/
cmd = DWC3_DEPCMD_ENDTRANSFER;
- cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
+ cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
+ cmd |= DWC3_DEPCMD_CMDIOC;
cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
memset(&params, 0, sizeof(params));
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
@@ -2260,17 +2323,23 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
reg |= DWC3_DCTL_HIRD_THRES(12);
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ } else {
+ reg = dwc3_readl(dwc->regs, DWC3_DCTL);
+ reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
}
dep = dwc->eps[0];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
+ false);
if (ret) {
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
return;
}
dep = dwc->eps[1];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
+ false);
if (ret) {
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
return;
@@ -2378,9 +2447,50 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
dwc->link_state = next;
+ switch (next) {
+ case DWC3_LINK_STATE_U1:
+ if (dwc->speed == USB_SPEED_SUPER)
+ dwc3_suspend_gadget(dwc);
+ break;
+ case DWC3_LINK_STATE_U2:
+ case DWC3_LINK_STATE_U3:
+ dwc3_suspend_gadget(dwc);
+ break;
+ case DWC3_LINK_STATE_RESUME:
+ dwc3_resume_gadget(dwc);
+ break;
+ default:
+ /* do nothing */
+ break;
+ }
+
dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
}
+static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
+ unsigned int evtinfo)
+{
+ unsigned int is_ss = evtinfo & BIT(4);
+
+ /**
+ * WORKAROUND: DWC3 revison 2.20a with hibernation support
+ * have a known issue which can cause USB CV TD.9.23 to fail
+ * randomly.
+ *
+ * Because of this issue, core could generate bogus hibernation
+ * events which SW needs to ignore.
+ *
+ * Refers to:
+ *
+ * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
+ * Device Fallback from SuperSpeed
+ */
+ if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
+ return;
+
+ /* enter hibernation here */
+}
+
static void dwc3_gadget_interrupt(struct dwc3 *dwc,
const struct dwc3_event_devt *event)
{
@@ -2397,6 +2507,13 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc,
case DWC3_DEVICE_EVENT_WAKEUP:
dwc3_gadget_wakeup_interrupt(dwc);
break;
+ case DWC3_DEVICE_EVENT_HIBER_REQ:
+ if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
+ "unexpected hibernation event\n"))
+ break;
+
+ dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
+ break;
case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
break;
@@ -2661,8 +2778,10 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
int dwc3_gadget_prepare(struct dwc3 *dwc)
{
- if (dwc->pullups_connected)
+ if (dwc->pullups_connected) {
dwc3_gadget_disable_irq(dwc);
+ dwc3_gadget_run_stop(dwc, true, true);
+ }
return 0;
}
@@ -2671,7 +2790,7 @@ void dwc3_gadget_complete(struct dwc3 *dwc)
{
if (dwc->pullups_connected) {
dwc3_gadget_enable_irq(dwc);
- dwc3_gadget_run_stop(dwc, true);
+ dwc3_gadget_run_stop(dwc, true, false);
}
}
@@ -2694,12 +2813,14 @@ int dwc3_gadget_resume(struct dwc3 *dwc)
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
dep = dwc->eps[0];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
+ false);
if (ret)
goto err0;
dep = dwc->eps[1];
- ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
+ false);
if (ret)
goto err1;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.