diff options
Diffstat (limited to 'drivers/usb/dwc3/debugfs.c')
| -rw-r--r-- | drivers/usb/dwc3/debugfs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c index e613a61ae58a..1c792710348f 100644 --- a/drivers/usb/dwc3/debugfs.c +++ b/drivers/usb/dwc3/debugfs.c @@ -542,6 +542,13 @@ static int dwc3_link_state_show(struct seq_file *s, void *unused) u8 speed; spin_lock_irqsave(&dwc->lock, flags); + reg = dwc3_readl(dwc->regs, DWC3_GSTS); + if (DWC3_GSTS_CURMOD(reg) != DWC3_GSTS_CURMOD_DEVICE) { + seq_puts(s, "Not available\n"); + spin_unlock_irqrestore(&dwc->lock, flags); + return 0; + } + reg = dwc3_readl(dwc->regs, DWC3_DSTS); state = DWC3_DSTS_USBLNKST(reg); speed = reg & DWC3_DSTS_CONNECTSPD; @@ -589,6 +596,12 @@ static ssize_t dwc3_link_state_write(struct file *file, return -EINVAL; spin_lock_irqsave(&dwc->lock, flags); + reg = dwc3_readl(dwc->regs, DWC3_GSTS); + if (DWC3_GSTS_CURMOD(reg) != DWC3_GSTS_CURMOD_DEVICE) { + spin_unlock_irqrestore(&dwc->lock, flags); + return -EINVAL; + } + reg = dwc3_readl(dwc->regs, DWC3_DSTS); speed = reg & DWC3_DSTS_CONNECTSPD; |