drivers: usb: fsl: Implement Erratum A-009116 for XHCI controller
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>
diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
index 67147cb..c722c50 100644
--- a/drivers/usb/host/xhci-dwc3.c
+++ b/drivers/usb/host/xhci-dwc3.c
@@ -89,3 +89,9 @@
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));
+}
diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c
index 385422a..6781b94 100644
--- a/drivers/usb/host/xhci-fsl.c
+++ b/drivers/usb/host/xhci-fsl.c
@@ -58,6 +58,9 @@
/* 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;
}