usb: dwc3: add lfps filter quirk

This patch adds LFPS filter quirk, 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

@@ -26,6 +26,7 @@ Optional properties:
 			amount of 8B10B errors occur.
  - snps,del_phy_power_chg_quirk: when set core will delay PHY power change
 			from P0 to P1/P2/P3.
+ - snps,lfps_filter_quirk: when set core will filter LFPS reception.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 

drivers/usb/dwc3/core.c

@@ -386,6 +386,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->del_phy_power_chg_quirk)
 		reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
 
+	if (dwc->lfps_filter_quirk)
+		reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
 	mdelay(100);
@@ -771,6 +774,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,del_p1p2p3_quirk");
 		dwc->del_phy_power_chg_quirk = of_property_read_bool(node,
 				"snps,del_phy_power_chg_quirk");
+		dwc->lfps_filter_quirk = of_property_read_bool(node,
+				"snps,lfps_filter_quirk");
 	} else if (pdata) {
 		dwc->maximum_speed = pdata->maximum_speed;
 		dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -786,6 +791,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->req_p1p2p3_quirk = pdata->req_p1p2p3_quirk;
 		dwc->del_p1p2p3_quirk = pdata->del_p1p2p3_quirk;
 		dwc->del_phy_power_chg_quirk = pdata->del_phy_power_chg_quirk;
+		dwc->lfps_filter_quirk = pdata->lfps_filter_quirk;
 	}
 
 	/* default to superspeed if no maximum_speed passed */

drivers/usb/dwc3/core.h

@@ -183,6 +183,7 @@
 #define DWC3_GUSB3PIPECTL_DEP1P2P3_EN	DWC3_GUSB3PIPECTL_DEP1P2P3(1)
 #define DWC3_GUSB3PIPECTL_DEPOCHANGE	(1 << 18)
 #define DWC3_GUSB3PIPECTL_SUSPHY	(1 << 17)
+#define DWC3_GUSB3PIPECTL_LFPSFILT	(1 << 9)
 
 /* Global TX Fifo Size Register */
 #define DWC3_GTXFIFOSIZ_TXFDEF(n)	((n) & 0xffff)
@@ -691,6 +692,7 @@ struct dwc3_scratchpad_array {
  * @req_p1p2p3_quirk: set if we enable request p1p2p3 quirk
  * @del_p1p2p3_quirk: set if we enable delay p1p2p3 quirk
  * @del_phy_power_chg_quirk: set if we enable delay phy power change quirk
+ * @lfps_filter_quirk: set if we enable LFPS filter quirk
  */
 struct dwc3 {
 	struct usb_ctrlrequest	*ctrl_req;
@@ -804,6 +806,7 @@ struct dwc3 {
 	unsigned		req_p1p2p3_quirk:1;
 	unsigned                del_p1p2p3_quirk:1;
 	unsigned		del_phy_power_chg_quirk:1;
+	unsigned		lfps_filter_quirk:1;
 };
 
 /* -------------------------------------------------------------------------- */

drivers/usb/dwc3/platform_data.h

@@ -34,4 +34,5 @@ struct dwc3_platform_data {
 	unsigned req_p1p2p3_quirk:1;
 	unsigned del_p1p2p3_quirk:1;
 	unsigned del_phy_power_chg_quirk:1;
+	unsigned lfps_filter_quirk:1;
 };