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usb: dwc3: gadget: allow Link state changes via debugfs

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This is very useful for low level link testing where
we might not have a USB Host stack, only a scope to
verify signal integrity.

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2012-01-02 19:25:16 +02:00
parent 8598bde7fa
commit 138801aaa5
2 changed files with 111 additions and 1 deletions
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110
drivers/usb/dwc3/debugfs.c
View file

@ -549,6 +549,109 @@ static const struct file_operations dwc3_testmode_fops = {
.release = single_release, .release = single_release,
}; };
static int dwc3_link_state_show(struct seq_file *s, void *unused)
{
struct dwc3 *dwc = s->private;
unsigned long flags;
enum dwc3_link_state state;
u32 reg;
spin_lock_irqsave(&dwc->lock, flags);
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
state = DWC3_DSTS_USBLNKST(reg);
spin_unlock_irqrestore(&dwc->lock, flags);
switch (state) {
case DWC3_LINK_STATE_U0:
seq_printf(s, "U0\n");
break;
case DWC3_LINK_STATE_U1:
seq_printf(s, "U1\n");
break;
case DWC3_LINK_STATE_U2:
seq_printf(s, "U2\n");
break;
case DWC3_LINK_STATE_U3:
seq_printf(s, "U3\n");
break;
case DWC3_LINK_STATE_SS_DIS:
seq_printf(s, "SS.Disabled\n");
break;
case DWC3_LINK_STATE_RX_DET:
seq_printf(s, "Rx.Detect\n");
break;
case DWC3_LINK_STATE_SS_INACT:
seq_printf(s, "SS.Inactive\n");
break;
case DWC3_LINK_STATE_POLL:
seq_printf(s, "Poll\n");
break;
case DWC3_LINK_STATE_RECOV:
seq_printf(s, "Recovery\n");
break;
case DWC3_LINK_STATE_HRESET:
seq_printf(s, "HRESET\n");
break;
case DWC3_LINK_STATE_CMPLY:
seq_printf(s, "Compliance\n");
break;
case DWC3_LINK_STATE_LPBK:
seq_printf(s, "Loopback\n");
break;
default:
seq_printf(s, "UNKNOWN %d\n", reg);
}
return 0;
}
static int dwc3_link_state_open(struct inode *inode, struct file *file)
{
return single_open(file, dwc3_link_state_show, inode->i_private);
}
static ssize_t dwc3_link_state_write(struct file *file,
const char __user *ubuf, size_t count, loff_t *ppos)
{
struct seq_file *s = file->private_data;
struct dwc3 *dwc = s->private;
unsigned long flags;
enum dwc3_link_state state = 0;
char buf[32];
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
return -EFAULT;
if (!strncmp(buf, "SS.Disabled", 11))
state = DWC3_LINK_STATE_SS_DIS;
else if (!strncmp(buf, "Rx.Detect", 9))
state = DWC3_LINK_STATE_RX_DET;
else if (!strncmp(buf, "SS.Inactive", 11))
state = DWC3_LINK_STATE_SS_INACT;
else if (!strncmp(buf, "Recovery", 8))
state = DWC3_LINK_STATE_RECOV;
else if (!strncmp(buf, "Compliance", 10))
state = DWC3_LINK_STATE_CMPLY;
else if (!strncmp(buf, "Loopback", 8))
state = DWC3_LINK_STATE_LPBK;
else
return -EINVAL;
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_set_link_state(dwc, state);
spin_unlock_irqrestore(&dwc->lock, flags);
return count;
}
static const struct file_operations dwc3_link_state_fops = {
.open = dwc3_link_state_open,
.write = dwc3_link_state_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int __devinit dwc3_debugfs_init(struct dwc3 *dwc) int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
{ {
struct dentry *root; struct dentry *root;
@ -584,6 +687,13 @@ int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
goto err1; goto err1;
} }
file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
dwc, &dwc3_link_state_fops);
if (IS_ERR(file)) {
ret = PTR_ERR(file);
goto err1;
}
return 0; return 0;
err1: err1:

2
drivers/usb/dwc3/gadget.c
View file

@ -117,7 +117,7 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
if (DWC3_DSTS_USBLNKST(reg) == state) if (DWC3_DSTS_USBLNKST(reg) == state)
return 0; return 0;
usleep_range(500, 1500); udelay(500);
} }
dev_vdbg(dwc->dev, "link state change request timed out\n"); dev_vdbg(dwc->dev, "link state change request timed out\n");