diff options
| author | Jagan Teki <jagan@amarulasolutions.com> | 2020-05-26 11:34:29 +0800 |
|---|---|---|
| committer | Kever Yang <kever.yang@rock-chips.com> | 2020-05-29 18:13:19 +0800 |
| commit | fafaa02290715a02ae97b26fa6937d6a27cdc296 (patch) | |
| tree | 61a207bba10234e6eac0848ea5c8d02b3bae36ce /drivers | |
| parent | dc18413adbf188ffdfb0706023249e7c03b29545 (diff) | |
usb: dwc3: Enable AutoRetry feature in the controller
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 9 | ||||
| -rw-r--r-- | drivers/usb/dwc3/core.h | 3 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index b399c9bea9..d7f666ba3c 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -997,6 +997,15 @@ 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 ca72b490df..d1f8606b84 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -161,6 +161,9 @@ #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) |