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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>
This commit is contained in:
Anurag Kumar Vulisha 2018-07-27 13:11:20 +05:30 committed by Felipe Balbi
parent a770046811
commit b138e23d3d
2 changed files with 19 additions and 0 deletions
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16
drivers/usb/dwc3/core.c
View File

@ -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.

3
drivers/usb/dwc3/core.h
View File

@ -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)