diff options
| author | Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com> | 2018-07-27 13:11:20 +0530 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2018-07-30 10:39:18 +0300 |
| commit | b138e23d3dff90c0494925b4c1874227b81bddf7 (patch) | |
| tree | f6f383735e528ea9cbaedfe200101492b98ba576 /drivers/usb/dwc3 | |
| parent | a77004681148f5773c20370812ca7d14443fb091 (diff) | |
| download | linux-b138e23d3dff90c0494925b4c1874227b81bddf7.tar.bz2 | |
usb: dwc3: core: 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.
Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 16 | ||||
| -rw-r--r-- | drivers/usb/dwc3/core.h | 3 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 64ba664d467c..88c80fcc39f5 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -985,6 +985,22 @@ static int dwc3_core_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); + + /* + * Enable Auto retry Feature to make the controller operating in + * Host mode on seeing transaction errors(CRC errors or internal + * overrun scenerios) on IN transfers to reply to the device + * with a non-terminating retry ACK (i.e, an ACK transcation + * packet with Retry=1 & Nump != 0) + */ + reg |= DWC3_GUCTL_HSTINAUTORETRY; + + dwc3_writel(dwc->regs, DWC3_GUCTL, reg); + } + /* * Must config both number of packets and max burst settings to enable * RX and/or TX threshold. diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 5f14fb7121b1..5bfb62533e0f 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -238,6 +238,9 @@ #define DWC3_GCTL_GBLHIBERNATIONEN BIT(1) #define DWC3_GCTL_DSBLCLKGTNG BIT(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) |