- Add platform interface to choose ttctrl.ttha

- Some tiny improvements
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Merge tag 'usb-ci-v4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-next

Peter writes:

- Add platform interface to choose ttctrl.ttha
- Some tiny improvements

Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt

@@ -2,7 +2,14 @@
 
 Required properties:
 - compatible: should be one of:
+	"fsl,imx23-usb"
 	"fsl,imx27-usb"
+	"fsl,imx28-usb"
+	"fsl,imx6q-usb"
+	"fsl,imx6sl-usb"
+	"fsl,imx6sx-usb"
+	"fsl,imx6ul-usb"
+	"fsl,imx7d-usb"
 	"lsi,zevio-usb"
 	"qcom,ci-hdrc"
 	"chipidea,usb2"
@@ -53,6 +60,22 @@ Optional properties:
   be specified.
 - phy-clkgate-delay-us: the delay time (us) between putting the PHY into
   low power mode and gating the PHY clock.
+- non-zero-ttctrl-ttha: after setting this property, the value of register
+  ttctrl.ttha will be 0x7f; if not, the value will be 0x0, this is the default
+  value. It needs to be very carefully for setting this property, it is
+  recommended that consult with your IC engineer before setting this value.
+  On the most of chipidea platforms, the "usage_tt" flag at RTL is 0, so this
+  property only affects siTD.
+  If this property is not set, the max packet size is 1023 bytes, and if
+  the total of packet size for pervious transactions are more than 256 bytes,
+  it can't accept any transactions within this frame. The use case is single
+  transaction, but higher frame rate.
+  If this property is set, the max packet size is 188 bytes, it can handle
+  more transactions than above case, it can accept transactions until it
+  considers the left room size within frame is less than 188 bytes, software
+  needs to make sure it does not send more than 90%
+  maximum_periodic_data_per_frame. The use case is multiple transactions, but
+  less frame rate.
 
 i.mx specific properties
 - fsl,usbmisc: phandler of non-core register device, with one

drivers/usb/chipidea/ci_hdrc_imx.c

@@ -28,6 +28,11 @@ struct ci_hdrc_imx_platform_flag {
 	bool runtime_pm;
 };
 
+static const struct ci_hdrc_imx_platform_flag imx23_usb_data = {
+	.flags = CI_HDRC_TURN_VBUS_EARLY_ON |
+		CI_HDRC_DISABLE_STREAMING,
+};
+
 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
 		CI_HDRC_DISABLE_STREAMING,
 };
@@ -66,6 +71,7 @@ static const struct ci_hdrc_imx_platform_flag imx7d_usb_data = {
 };
 
 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
+	{ .compatible = "fsl,imx23-usb", .data = &imx23_usb_data},
 	{ .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
 	{ .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
 	{ .compatible = "fsl,imx6q-usb", .data = &imx6q_usb_data},
@@ -244,7 +250,6 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	struct ci_hdrc_platform_data pdata = {
 		.name		= dev_name(&pdev->dev),
 		.capoffset	= DEF_CAPOFFSET,
-		.flags		= CI_HDRC_SET_NON_ZERO_TTHA,
 	};
 	int ret;
 	const struct of_device_id *of_id;
@@ -302,9 +307,9 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 				&pdata);
 	if (IS_ERR(data->ci_pdev)) {
 		ret = PTR_ERR(data->ci_pdev);
-		dev_err(&pdev->dev,
-			"Can't register ci_hdrc platform device, err=%d\n",
-			ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"ci_hdrc_add_device failed, err=%d\n", ret);
 		goto err_clk;
 	}
 

drivers/usb/chipidea/core.c

@@ -721,6 +721,9 @@ static int ci_get_platdata(struct device *dev,
 		return ret;
 	}
 
+	if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
+		platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
+
 	ext_id = ERR_PTR(-ENODEV);
 	ext_vbus = ERR_PTR(-ENODEV);
 	if (of_property_read_bool(dev->of_node, "extcon")) {

drivers/usb/chipidea/udc.c

@@ -819,7 +819,6 @@ static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 			       ci->ep0out : ci->ep0in;
 		if (!list_empty(&hwep->qh.queue)) {
 			_ep_nuke(hwep);
-			retval = -EOVERFLOW;
 			dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 				 _usb_addr(hwep));
 		}