usb: dwc3: add disable usb3 suspend phy quirk

This patch adds disable usb3 suspend phy quirk, and some special platforms
can configure that if it is needed.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/dwc3.txt

@@ -32,6 +32,7 @@ Optional properties:
  - snps,tx_de_emphasis_quirk: when set core will set Tx de-emphasis value.
  - snps,tx_de_emphasis: the value driven to the PHY is controlled by the
 			LTSSM during USB3 Compliance mode.
+ - snps,dis_u3_susphy_quirk: when set core will disable USB3 suspend phy.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 

drivers/usb/dwc3/core.c

@@ -404,6 +404,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->tx_de_emphasis_quirk)
 		reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
 
+	if (dwc->dis_u3_susphy_quirk && dwc->is_fpga)
+		reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
 	mdelay(100);
@@ -812,6 +815,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,lfps_filter_quirk");
 		dwc->rx_detect_poll_quirk = of_property_read_bool(node,
 				"snps,rx_detect_poll_quirk");
+		dwc->dis_u3_susphy_quirk = of_property_read_bool(node,
+				"snps,dis_u3_susphy_quirk");
 
 		dwc->tx_de_emphasis_quirk = of_property_read_bool(node,
 				"snps,tx_de_emphasis_quirk");
@@ -834,6 +839,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->del_phy_power_chg_quirk = pdata->del_phy_power_chg_quirk;
 		dwc->lfps_filter_quirk = pdata->lfps_filter_quirk;
 		dwc->rx_detect_poll_quirk = pdata->rx_detect_poll_quirk;
+		dwc->dis_u3_susphy_quirk = pdata->dis_u3_susphy_quirk;
 
 		dwc->tx_de_emphasis_quirk = pdata->tx_de_emphasis_quirk;
 		if (pdata->tx_de_emphasis)

drivers/usb/dwc3/core.h

@@ -697,6 +697,7 @@ struct dwc3_scratchpad_array {
  * @del_phy_power_chg_quirk: set if we enable delay phy power change quirk
  * @lfps_filter_quirk: set if we enable LFPS filter quirk
  * @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
+ * @dis_u3_susphy_quirk: set if we disable usb3 suspend phy
  * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
  * @tx_de_emphasis: Tx de-emphasis value
  * 	0	- -6dB de-emphasis
@@ -818,6 +819,7 @@ struct dwc3 {
 	unsigned		del_phy_power_chg_quirk:1;
 	unsigned		lfps_filter_quirk:1;
 	unsigned		rx_detect_poll_quirk:1;
+	unsigned		dis_u3_susphy_quirk:1;
 
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;

drivers/usb/dwc3/platform_data.h

@@ -36,6 +36,7 @@ struct dwc3_platform_data {
 	unsigned del_phy_power_chg_quirk:1;
 	unsigned lfps_filter_quirk:1;
 	unsigned rx_detect_poll_quirk:1;
+	unsigned dis_u3_susphy_quirk:1;
 
 	unsigned tx_de_emphasis_quirk:1;
 	unsigned tx_de_emphasis:2;