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usb: dwc2: Add reset ctrl to driver

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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>
This commit is contained in:
Ley Foon Tan 2018-08-29 00:08:48 +08:00 committed by Marek Vasut
parent 1335e7745f
commit 88c34b8da6
1 changed files with 37 additions and 0 deletions
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37
drivers/usb/host/dwc2.c
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@ -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 +1127,43 @@ 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 0 if error due to !CONFIG_DM_RESET and reset
* DT property is not present.
*/
if (ret == -ENOENT || ret == -ENOTSUPP)
return 0;
else
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(&regs->gsnpsid);
dev_info(dev, "Core Release: %x.%03x\n",
@ -1303,6 +1338,8 @@ static int dwc2_usb_remove(struct udevice *dev)
dwc2_uninit_common(priv->regs);
reset_release_bulk(&priv->resets);
return 0;
}