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>

3 files changed, 12 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 600d3bc8d04d..c07651484c60 100644
--- a/drivers/usb/dwc3/core.c
+++ b/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 */
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index ce331630fad9..b8fbc4a1ee4a 100644
--- a/drivers/usb/dwc3/core.h
+++ b/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;
 };
 
 /* -------------------------------------------------------------------------- */
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index d3e6ec210ef3..a421cecd6c16 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/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;
 };