usb: dwc3: add delay p1p2p3 quirk

This patch adds delay P0 to P1/P2/P3 quirk for U2/U2/U3, and some special
platforms can configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/dwc3.txt

@@ -22,6 +22,8 @@ Optional properties:
  - snps,u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
  - snps,req_p1p2p3_quirk: when set, the core will always request for
 			P1/P2/P3 transition sequence.
+ - snps,del_p1p2p3_quirk: when set core will delay P1/P2/P3 until a certain
+			amount of 8B10B errors occur.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 

drivers/usb/dwc3/core.c

@@ -380,6 +380,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->req_p1p2p3_quirk)
 		reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
 
+	if (dwc->del_p1p2p3_quirk)
+		reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
 	mdelay(100);
@@ -761,6 +764,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,u2ss_inp3_quirk");
 		dwc->req_p1p2p3_quirk = of_property_read_bool(node,
 				"snps,req_p1p2p3_quirk");
+		dwc->del_p1p2p3_quirk = of_property_read_bool(node,
+				"snps,del_p1p2p3_quirk");
 	} else if (pdata) {
 		dwc->maximum_speed = pdata->maximum_speed;
 		dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -774,6 +779,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;
 		dwc->u2ss_inp3_quirk = pdata->u2ss_inp3_quirk;
 		dwc->req_p1p2p3_quirk = pdata->req_p1p2p3_quirk;
+		dwc->del_p1p2p3_quirk = pdata->del_p1p2p3_quirk;
 	}
 
 	/* default to superspeed if no maximum_speed passed */

drivers/usb/dwc3/core.h

@@ -178,6 +178,9 @@
 #define DWC3_GUSB3PIPECTL_PHYSOFTRST	(1 << 31)
 #define DWC3_GUSB3PIPECTL_U2SSINP3OK	(1 << 29)
 #define DWC3_GUSB3PIPECTL_REQP1P2P3	(1 << 24)
+#define DWC3_GUSB3PIPECTL_DEP1P2P3(n)	((n) << 19)
+#define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK	DWC3_GUSB3PIPECTL_DEP1P2P3(7)
+#define DWC3_GUSB3PIPECTL_DEP1P2P3_EN	DWC3_GUSB3PIPECTL_DEP1P2P3(1)
 #define DWC3_GUSB3PIPECTL_SUSPHY	(1 << 17)
 
 /* Global TX Fifo Size Register */
@@ -685,6 +688,7 @@ struct dwc3_scratchpad_array {
  * @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
  * @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
  * @req_p1p2p3_quirk: set if we enable request p1p2p3 quirk
+ * @del_p1p2p3_quirk: set if we enable delay p1p2p3 quirk
  */
 struct dwc3 {
 	struct usb_ctrlrequest	*ctrl_req;
@@ -796,6 +800,7 @@ struct dwc3 {
 	unsigned		u2exit_lfps_quirk:1;
 	unsigned		u2ss_inp3_quirk:1;
 	unsigned		req_p1p2p3_quirk:1;
+	unsigned                del_p1p2p3_quirk:1;
 };
 
 /* -------------------------------------------------------------------------- */

drivers/usb/dwc3/platform_data.h

@@ -32,4 +32,5 @@ struct dwc3_platform_data {
 	unsigned u2exit_lfps_quirk:1;
 	unsigned u2ss_inp3_quirk:1;
 	unsigned req_p1p2p3_quirk:1;
+	unsigned del_p1p2p3_quirk:1;
 };