Add code to reset all reset signals as in usb DT node. A reset property is an optional feature, so only print out a warning and do not fail if a reset property is not present.
If a reset property is discovered, then use it to deassert, thus bringing the IP out of reset.
Signed-off-by: Ley Foon Tan ley.foon.tan@intel.com
--- v2: - Assert reset when .remove. --- drivers/usb/host/dwc2.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index cbe065b..bee3b33 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -15,6 +15,7 @@ #include <wait_bit.h> #include <asm/io.h> #include <power/regulator.h> +#include <reset.h>
#include "dwc2.h"
@@ -49,6 +50,8 @@ struct dwc2_priv { */ bool hnp_srp_disable; bool oc_disable; + + struct reset_ctl_bulk resets; };
#ifndef CONFIG_DM_USB @@ -1124,11 +1127,37 @@ int _submit_int_msg(struct dwc2_priv *priv, struct usb_device *dev, } }
+static int dwc2_reset(struct udevice *dev) +{ + int ret; + struct dwc2_priv *priv = dev_get_priv(dev); + + ret = reset_get_bulk(dev, &priv->resets); + if (ret) { + dev_warn(dev, "Can't get reset: %d\n", ret); + return ret; + } + + ret = reset_deassert_bulk(&priv->resets); + if (ret) { + reset_release_bulk(&priv->resets); + dev_err(dev, "Failed to reset: %d\n", ret); + return ret; + } + + return 0; +} + static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv) { struct dwc2_core_regs *regs = priv->regs; uint32_t snpsid; int i, j; + int ret; + + ret = dwc2_reset(dev); + if (ret) + return ret;
snpsid = readl(®s->gsnpsid); dev_info(dev, "Core Release: %x.%03x\n", @@ -1303,6 +1332,8 @@ static int dwc2_usb_remove(struct udevice *dev)
dwc2_uninit_common(priv->regs);
+ reset_release_bulk(&priv->resets); + return 0; }