From fab3833338779e1e668bd58d1f76d601657304b8 Mon Sep 17 00:00:00 2001 From: Thinh Nguyen Date: Fri, 16 Mar 2018 15:33:48 -0700 Subject: [PATCH] usb: dwc3: Add SoftReset PHY synchonization delay From DWC_usb31 programming guide section 1.3.2, once DWC3_DCTL_CSFTRST bit is cleared, we must wait at least 50ms before accessing the PHY domain (synchronization delay). Signed-off-by: Thinh Nguyen Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/core.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index e8890c0..5491d96 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -244,7 +244,7 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc) do { reg = dwc3_readl(dwc->regs, DWC3_DCTL); if (!(reg & DWC3_DCTL_CSFTRST)) - return 0; + goto done; udelay(1); } while (--retries); @@ -253,6 +253,17 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc) phy_exit(dwc->usb2_generic_phy); return -ETIMEDOUT; + +done: + /* + * For DWC_usb31 controller, once DWC3_DCTL_CSFTRST bit is cleared, + * we must wait at least 50ms before accessing the PHY domain + * (synchronization delay). DWC_usb31 programming guide section 1.3.2. + */ + if (dwc3_is_usb31(dwc)) + msleep(50); + + return 0; } /* -- 2.7.4