| Message ID | 20200513071710.5651-1-frank.wang@rock-chips.com |
|---|---|
| State | New |
| Headers | show |
| Series |
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| Related | show |
On 2020/5/13 下午3:17, Frank Wang wrote: > From: Jagan Teki <jagan@amarulasolutions.com> > > By default when core sees any transaction error (CRC or overflow) it > replies with terminating retry ACK (Retry=1 and Nump == 0). > > Enabling this Auto Retry feature in controller will make the core send > a non-terminanting ACK upon such transaction errors. That is, ACK TP > with Retry=1 and Nump != 0. > > Doing so will give controller a chance to recover from transient error > conditions. > > Reference from below Linux commit, > > commit <b138e23d3dff> ("usb: dwc3: core: Enable AutoRetry feature > in the controller") > > Cc: Marek Vasut <marex@denx.de> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Thanks, - Kever > --- > drivers/usb/dwc3/core.c | 9 +++++++++ > drivers/usb/dwc3/core.h | 3 +++ > 2 files changed, 12 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index dc92f471c1..aab6c34c2d 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -995,6 +995,15 @@ int dwc3_init(struct dwc3 *dwc) > dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); > } > > + if (dwc->dr_mode == USB_DR_MODE_HOST || > + dwc->dr_mode == USB_DR_MODE_OTG) { > + reg = dwc3_readl(dwc->regs, DWC3_GUCTL); > + > + reg |= DWC3_GUCTL_HSTINAUTORETRY; > + > + dwc3_writel(dwc->regs, DWC3_GUCTL, reg); > + } > + > ret = dwc3_core_init_mode(dwc); > if (ret) > goto mode_fail; > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h > index b510d8a983..2adcaf0029 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -160,6 +160,9 @@ > #define DWC3_GCTL_GBLHIBERNATIONEN (1 << 1) > #define DWC3_GCTL_DSBLCLKGTNG (1 << 0) > > +/* Global User Control Register */ > +#define DWC3_GUCTL_HSTINAUTORETRY BIT(14) > + > /* Global User Control 1 Register */ > #define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28) > #define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index dc92f471c1..aab6c34c2d 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -995,6 +995,15 @@ int dwc3_init(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); } + if (dwc->dr_mode == USB_DR_MODE_HOST || + dwc->dr_mode == USB_DR_MODE_OTG) { + reg = dwc3_readl(dwc->regs, DWC3_GUCTL); + + reg |= DWC3_GUCTL_HSTINAUTORETRY; + + dwc3_writel(dwc->regs, DWC3_GUCTL, reg); + } + ret = dwc3_core_init_mode(dwc); if (ret) goto mode_fail; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index b510d8a983..2adcaf0029 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -160,6 +160,9 @@ #define DWC3_GCTL_GBLHIBERNATIONEN (1 << 1) #define DWC3_GCTL_DSBLCLKGTNG (1 << 0) +/* Global User Control Register */ +#define DWC3_GUCTL_HSTINAUTORETRY BIT(14) + /* Global User Control 1 Register */ #define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28) #define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24)