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Merge "usb: dwc3: Increase the inter packet gap for USB 2.0"

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qctecmdr 2019-10-25 09:06:53 -07:00 • committed by Gerrit - the friendly Code Review server
commit c4cf9870ca
2 changed files with 8 additions and 0 deletions
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7
drivers/usb/dwc3/core.c
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@ -1049,6 +1049,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
}
}
/* set inter-packet gap 199.794ns to improve EL_23 margin */
if (dwc->revision >= DWC3_USB31_REVISION_170A) {
reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
reg |= DWC3_GUCTL1_IP_GAP_ADD_ON(1);
dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
}
return 0;
err4:

1
drivers/usb/dwc3/core.h
View file

@ -251,6 +251,7 @@
/* Global User Control 1 Register */
#define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28)
#define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24)
#define DWC3_GUCTL1_IP_GAP_ADD_ON(n) (n << 21)
/* Global Status Register */
#define DWC3_GSTS_OTG_IP BIT(10)