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drivers: usb: fsl: Implement Erratum A-009116 for XHCI controller

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This adjusts (micro)frame length to appropriate value thus
avoiding USB devices to time out over a longer run

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
This commit is contained in:
Nikhil Badola
2015-06-23 09:17:49 +05:30
committed by Marek Vasut
parent 7e5a32fcf3
commit 667f4dd90f
3 changed files with 25 additions and 6 deletions
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6
drivers/usb/host/xhci-dwc3.c
View File

@@ -89,3 +89,9 @@ int dwc3_core_init(struct dwc3 *dwc3_reg)
return 0;
}
void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
{
setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
GFLADJ_30MHZ(val));
}

3
drivers/usb/host/xhci-fsl.c
View File

@@ -58,6 +58,9 @@ static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci)
/* We are hard-coding DWC3 core to Host Mode */
dwc3_set_mode(fsl_xhci->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
/* Set GFLADJ_30MHZ as 20h as per XHCI spec default value */
dwc3_set_fladj(fsl_xhci->dwc3_reg, GFLADJ_30MHZ_DEFAULT);
return ret;
}