3 files changed, 18 insertions, 18 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index e027c0420dc3..573421984948 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1644,13 +1644,8 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
 	 * This device property is for kernel internal use only and
 	 * is expected to be set by the glue code.
 	 */
-	if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) {
-		edev = extcon_get_extcon_dev(name);
-		if (!edev)
-			return ERR_PTR(-EPROBE_DEFER);
-
-		return edev;
-	}
+	if (device_property_read_string(dev, "linux,extcon-name", &name) == 0)
+		return extcon_get_extcon_dev(name);
 
 	/*
 	 * Try to get an extcon device from the USB PHY controller's "port"
diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index ba51de7dd760..6b018048fe2e 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -127,6 +127,7 @@ static const struct property_entry dwc3_pci_intel_phy_charger_detect_properties[
 	PROPERTY_ENTRY_STRING("dr_mode", "peripheral"),
 	PROPERTY_ENTRY_BOOL("snps,dis_u2_susphy_quirk"),
 	PROPERTY_ENTRY_BOOL("linux,phy_charger_detect"),
+	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
 	{}
 };
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 00427d108ab9..8716bece1072 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2976,6 +2976,7 @@ static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
 	struct dwc3 *dwc = dep->dwc;
 	u32 mdwidth;
 	int size;
+	int maxpacket;
 
 	mdwidth = dwc3_mdwidth(dwc);
 
@@ -2988,21 +2989,24 @@ static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
 	else
 		size = DWC31_GTXFIFOSIZ_TXFDEP(size);
 
-	/* FIFO Depth is in MDWDITH bytes. Multiply */
-	size *= mdwidth;
-
 	/*
-	 * To meet performance requirement, a minimum TxFIFO size of 3x
-	 * MaxPacketSize is recommended for endpoints that support burst and a
-	 * minimum TxFIFO size of 2x MaxPacketSize for endpoints that don't
-	 * support burst. Use those numbers and we can calculate the max packet
-	 * limit as below.
+	 * maxpacket size is determined as part of the following, after assuming
+	 * a mult value of one maxpacket:
+	 * DWC3 revision 280A and prior:
+	 * fifo_size = mult * (max_packet / mdwidth) + 1;
+	 * maxpacket = mdwidth * (fifo_size - 1);
+	 *
+	 * DWC3 revision 290A and onwards:
+	 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
+	 * maxpacket = mdwidth * ((fifo_size - 1) - 1) - mdwidth;
 	 */
-	if (dwc->maximum_speed >= USB_SPEED_SUPER)
-		size /= 3;
+	if (DWC3_VER_IS_PRIOR(DWC3, 290A))
+		maxpacket = mdwidth * (size - 1);
 	else
-		size /= 2;
+		maxpacket = mdwidth * ((size - 1) - 1) - mdwidth;
 
+	/* Functionally, space for one max packet is sufficient */
+	size = min_t(int, maxpacket, 1024);
 	usb_ep_set_maxpacket_limit(&dep->endpoint, size);
 
 	dep->endpoint.max_streams = 16;