usb: dwc3: add rx_detect to polling lfps quirk

This patch adds RX_DETECT to Polling.LFPS control 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>

4 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 4edd29a24e74..1ecc33315e1f 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -27,6 +27,8 @@ Optional properties:
  - 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.
+ - snps,rx_detect_poll_quirk: when set core will disable a 400us delay to start
+                        Polling LFPS after RX.Detect.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 29a7da0c3178..b440b2b29872 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -389,6 +389,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
         if (dwc->lfps_filter_quirk)
                 reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
 
+        if (dwc->rx_detect_poll_quirk)
+                reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
+
         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
         mdelay(100);
@@ -776,6 +779,8 @@ static int dwc3_probe(struct platform_device *pdev)
                                 "snps,del_phy_power_chg_quirk");
                 dwc->lfps_filter_quirk = of_property_read_bool(node,
                                 "snps,lfps_filter_quirk");
+                dwc->rx_detect_poll_quirk = of_property_read_bool(node,
+                                "snps,rx_detect_poll_quirk");
         } else if (pdata) {
                 dwc->maximum_speed = pdata->maximum_speed;
                 dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -792,6 +797,7 @@ static int dwc3_probe(struct platform_device *pdev)
                 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;
+                dwc->rx_detect_poll_quirk = pdata->rx_detect_poll_quirk;
         }
 
         /* default to superspeed if no maximum_speed passed */
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 368d32948e27..8953d739b73d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -184,6 +184,7 @@
 #define DWC3_GUSB3PIPECTL_DEPOCHANGE    (1 << 18)
 #define DWC3_GUSB3PIPECTL_SUSPHY        (1 << 17)
 #define DWC3_GUSB3PIPECTL_LFPSFILT      (1 << 9)
+#define DWC3_GUSB3PIPECTL_RX_DETOPOLL   (1 << 8)
 
 /* Global TX Fifo Size Register */
 #define DWC3_GTXFIFOSIZ_TXFDEF(n)       ((n) & 0xffff)
@@ -693,6 +694,7 @@ struct dwc3_scratchpad_array {
  * @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
+ * @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
  */
 struct dwc3 {
         struct usb_ctrlrequest  *ctrl_req;
@@ -807,6 +809,7 @@ struct dwc3 {
         unsigned                del_p1p2p3_quirk:1;
         unsigned                del_phy_power_chg_quirk:1;
         unsigned                lfps_filter_quirk:1;
+        unsigned                rx_detect_poll_quirk:1;
 };
 
 /* -------------------------------------------------------------------------- */
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index dad0211e8743..4a0f06b2a6c7 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -35,4 +35,5 @@ struct dwc3_platform_data {
         unsigned del_p1p2p3_quirk:1;
         unsigned del_phy_power_chg_quirk:1;
         unsigned lfps_filter_quirk:1;
+        unsigned rx_detect_poll_quirk:1;
 };