usb: dwc3: add delay phy power change quirk

This patch adds delay PHY power change from P0 to P1/P2/P3 when link state
changing from U0 to U1/U2/U3 respectively, 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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c07651484c60..de6a00969bc7 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -383,6 +383,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
         if (dwc->del_p1p2p3_quirk)
                 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
 
+        if (dwc->del_phy_power_chg_quirk)
+                reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
+
         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
         mdelay(100);
@@ -766,6 +769,8 @@ static int dwc3_probe(struct platform_device *pdev)
                                 "snps,req_p1p2p3_quirk");
                 dwc->del_p1p2p3_quirk = of_property_read_bool(node,
                                 "snps,del_p1p2p3_quirk");
+                dwc->del_phy_power_chg_quirk = of_property_read_bool(node,
+                                "snps,del_phy_power_chg_quirk");
         } else if (pdata) {
                 dwc->maximum_speed = pdata->maximum_speed;
                 dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -780,6 +785,7 @@ static int dwc3_probe(struct platform_device *pdev)
                 dwc->u2ss_inp3_quirk = pdata->u2ss_inp3_quirk;
                 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;
         }
 
         /* default to superspeed if no maximum_speed passed */