Assert reset before deassert in dwc2_reset;
this patch solve issues when the DWC2 registers are already
initialized with value incompatible with host mode.
Force a hardware reset of the IP reset all the DWC2 registers at
default value, the host driver start with a clean state
(Core Soft reset doen in dwc_otg_core_reset is not enought
to reset all register).
The error can occurs in U-Boot when DWC2 device gadget driver
force device mode (called by ums or dfu command, before to execute
the usb start command).
Signed-off-by: Patrick Delaunay <patrick.delau...@st.com>
---
Changes in v4: None
Changes in v3: None
Changes in v2:
- add clk_disable_bulk in dwc2_usb_remove
drivers/usb/host/dwc2.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index d56d0e61b5..f53913cde4 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -1151,6 +1151,8 @@ static int dwc2_reset(struct udevice *dev)
return ret;
}
+ /* force reset to clear all IP register */
+ reset_assert_bulk(&priv->resets);
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
reset_release_bulk(&priv->resets);
--
2.17.1
