[PATCH v7 47/63] usb: dwc3: import from kernel v6.2

[Anders Roxell <anders.roxell@linaro.org>]

From: Jens Wiklander <jens.wiklander@linaro.org>

Sync Linux kernel dwc3 changes from v6.1 to v6.2.

The following files are preserved across the import:
Makefile Kconfig dwc3-meson-g12a.c dwc3-meson-gxl.c dwc3-omap.c
dwc3-uniphier.c dwc3-generic.h dwc3-generic.c dwc3-generic-sti.c
dwc3-layerscape.c ti_usb_phy.c

Skipping unused files:
debugfs.c drd.c dwc3-exynos.c dwc3-haps.c dwc3-imx8mp.c dwc3-keystone.c
dwc3-octeon.c dwc3-of-simple.c dwc3-pci.c dwc3-qcom.c dwc3-qcom-legacy.c
dwc3-rtk.c dwc3-st.c dwc3-xilinx.c host.c trace.c trace.h ulpi.c

Note that this is a raw import and doesn't build.
A fixup commit at the end of the series fixes that.

List of commits: git log --oneline v6.1..v6.2
Commits imported:
c4e3ef568539 usb: dwc3: gadget: Ignore End Transfer delay on teardown
63130462c919 usb: dwc3: core: defer probe on ulpi_read_id timeout
62c73bfea048 usb: dwc3: Fix race between dwc3_set_mode and __dwc3_set_mode
049142335613 usb: dwc3: gadget: Reduce TRB IOC settings

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
---
 drivers/usb/dwc3/core.c   | 23 ++++++++++++++++-------
 drivers/usb/dwc3/gadget.c | 19 ++++++++++++++++---
 2 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 1f348bc867c2..476b63618511 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -122,21 +122,25 @@ static void __dwc3_set_mode(struct work_struct *work)
 	unsigned long flags;
 	int ret;
 	u32 reg;
+	u32 desired_dr_role;
 
 	mutex_lock(&dwc->mutex);
+	spin_lock_irqsave(&dwc->lock, flags);
+	desired_dr_role = dwc->desired_dr_role;
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	pm_runtime_get_sync(dwc->dev);
 
 	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
 		dwc3_otg_update(dwc, 0);
 
-	if (!dwc->desired_dr_role)
+	if (!desired_dr_role)
 		goto out;
 
-	if (dwc->desired_dr_role == dwc->current_dr_role)
+	if (desired_dr_role == dwc->current_dr_role)
 		goto out;
 
-	if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
+	if (desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
 		goto out;
 
 	switch (dwc->current_dr_role) {
@@ -164,7 +168,7 @@ static void __dwc3_set_mode(struct work_struct *work)
 	 */
 	if (dwc->current_dr_role && ((DWC3_IP_IS(DWC3) ||
 			DWC3_VER_IS_PRIOR(DWC31, 190A)) &&
-			dwc->desired_dr_role != DWC3_GCTL_PRTCAP_OTG)) {
+			desired_dr_role != DWC3_GCTL_PRTCAP_OTG)) {
 		reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 		reg |= DWC3_GCTL_CORESOFTRESET;
 		dwc3_writel(dwc->regs, DWC3_GCTL, reg);
@@ -184,11 +188,11 @@ static void __dwc3_set_mode(struct work_struct *work)
 
 	spin_lock_irqsave(&dwc->lock, flags);
 
-	dwc3_set_prtcap(dwc, dwc->desired_dr_role);
+	dwc3_set_prtcap(dwc, desired_dr_role);
 
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
-	switch (dwc->desired_dr_role) {
+	switch (desired_dr_role) {
 	case DWC3_GCTL_PRTCAP_HOST:
 		ret = dwc3_host_init(dwc);
 		if (ret) {
@@ -1096,8 +1100,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
 
 	if (!dwc->ulpi_ready) {
 		ret = dwc3_core_ulpi_init(dwc);
-		if (ret)
+		if (ret) {
+			if (ret == -ETIMEDOUT) {
+				dwc3_core_soft_reset(dwc);
+				ret = -EPROBE_DEFER;
+			}
 			goto err0;
+		}
 		dwc->ulpi_ready = true;
 	}
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6d524fa76443..89dcfac01235 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1464,8 +1464,18 @@ static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,
 			 */
 			if (num_trbs_left == 1 || (needs_extra_trb &&
 					num_trbs_left <= 2 &&
-					sg_dma_len(sg_next(s)) >= length))
-				must_interrupt = true;
+					sg_dma_len(sg_next(s)) >= length)) {
+				struct dwc3_request *r;
+
+				/* Check if previous requests already set IOC */
+				list_for_each_entry(r, &dep->started_list, list) {
+					if (r != req && !r->request.no_interrupt)
+						break;
+
+					if (r == req)
+						must_interrupt = true;
+				}
+			}
 
 			dwc3_prepare_one_trb(dep, req, trb_length, 1, i, false,
 					must_interrupt);
@@ -1717,6 +1727,7 @@ static int __dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool int
 	else if (!ret)
 		dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
 
+	dep->flags &= ~DWC3_EP_DELAY_STOP;
 	return ret;
 }
 
@@ -3722,8 +3733,10 @@ void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	if (dep->number <= 1 && dwc->ep0state != EP0_DATA_PHASE)
 		return;
 
+	if (interrupt && (dep->flags & DWC3_EP_DELAY_STOP))
+		return;
+
 	if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
-	    (dep->flags & DWC3_EP_DELAY_STOP) ||
 	    (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
 		return;
 
-- 
2.53.0