Merge tag 'usb-for-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

Felipe writes:

usb: changes for v4.16 merge window

Not many changes here, the most important being an improvement for TI's
AM57xx and DRA7xx devices which allows them to disable a metastability
workaround in situations where we know what's going on.

Other than that, we have a set of changes on Renesas UDC to make the
code a little easier to read and maintain while also better supporting
extcon framework.

The u_serial adaptation layer learned to use kfifo instead of cooking
its own FIFO implementation.

DWC3 learned to decode a few more USB requests on the trace output.

drivers/usb/dwc3/core.c

@@ -1062,6 +1062,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
 				 &dwc->fladj);
 
+	dwc->dis_metastability_quirk = device_property_read_bool(dev,
+				"snps,dis_metastability_quirk");
+
 	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
 	dwc->tx_de_emphasis = tx_de_emphasis;
 

drivers/usb/dwc3/core.h

@@ -796,7 +796,6 @@ struct dwc3_scratchpad_array {
  * @usb2_generic_phy: pointer to USB2 PHY
  * @usb3_generic_phy: pointer to USB3 PHY
  * @ulpi: pointer to ulpi interface
- * @isoch_delay: wValue from Set Isochronous Delay request;
  * @u2sel: parameter from Set SEL request.
  * @u2pel: parameter from Set SEL request.
  * @u1sel: parameter from Set SEL request.
@@ -857,6 +856,7 @@ struct dwc3_scratchpad_array {
  * 	1	- -3.5dB de-emphasis
  * 	2	- No de-emphasis
  * 	3	- Reserved
+ * @dis_metastability_quirk: set to disable metastability quirk.
  * @imod_interval: set the interrupt moderation interval in 250ns
  *                 increments or 0 to disable.
  */
@@ -955,7 +955,6 @@ struct dwc3 {
 	enum dwc3_ep0_state	ep0state;
 	enum dwc3_link_state	link_state;
 
-	u16			isoch_delay;
 	u16			u2sel;
 	u16			u2pel;
 	u8			u1sel;
@@ -1010,6 +1009,8 @@ struct dwc3 {
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
 
+	unsigned		dis_metastability_quirk:1;
+
 	u16			imod_interval;
 };
 

drivers/usb/dwc3/debug.h

@@ -247,6 +247,15 @@ static inline void dwc3_decode_set_clear_feature(__u8 t, __u8 b, __u16 v,
 				case USB_DEVICE_TEST_MODE:
 					s = "Test Mode";
 					break;
+				case USB_DEVICE_U1_ENABLE:
+					s = "U1 Enable";
+					break;
+				case USB_DEVICE_U2_ENABLE:
+					s = "U2 Enable";
+					break;
+				case USB_DEVICE_LTM_ENABLE:
+					s = "LTM Enable";
+					break;
 				default:
 					s = "UNKNOWN";
 				} s; }),

drivers/usb/dwc3/ep0.c

@@ -736,11 +736,7 @@ static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ct
 	if (wIndex || wLength)
 		return -EINVAL;
 
-	/*
-	 * REVISIT It's unclear from Databook what to do with this
-	 * value. For now, just cache it.
-	 */
-	dwc->isoch_delay = wValue;
+	dwc->gadget.isoch_delay = wValue;
 
 	return 0;
 }

drivers/usb/dwc3/gadget.c

@@ -2005,7 +2005,8 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
 	 * STAR#9000525659: Clock Domain Crossing on DCTL in
 	 * USB 2.0 Mode
 	 */
-	if (dwc->revision < DWC3_REVISION_220A) {
+	if (dwc->revision < DWC3_REVISION_220A &&
+	    !dwc->dis_metastability_quirk) {
 		reg |= DWC3_DCFG_SUPERSPEED;
 	} else {
 		switch (speed) {
@@ -3224,7 +3225,8 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 	 * is less than super speed because we don't have means, yet, to tell
 	 * composite.c that we are USB 2.0 + LPM ECN.
 	 */
-	if (dwc->revision < DWC3_REVISION_220A)
+	if (dwc->revision < DWC3_REVISION_220A &&
+	    !dwc->dis_metastability_quirk)
 		dev_info(dwc->dev, "changing max_speed on rev %08x\n",
 				dwc->revision);
 

drivers/usb/dwc3/trace.h

@@ -37,12 +37,12 @@ DECLARE_EVENT_CLASS(dwc3_log_io,
 );
 
 DEFINE_EVENT(dwc3_log_io, dwc3_readl,
-	TP_PROTO(void *base, u32 offset, u32 value),
+	TP_PROTO(void __iomem *base, u32 offset, u32 value),
 	TP_ARGS(base, offset, value)
 );
 
 DEFINE_EVENT(dwc3_log_io, dwc3_writel,
-	TP_PROTO(void *base, u32 offset, u32 value),
+	TP_PROTO(void __iomem *base, u32 offset, u32 value),
 	TP_ARGS(base, offset, value)
 );