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| author | Thinh Nguyen <thinh.nguyen@synopsys.com> | 2018-11-07 17:56:23 -0800 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2018-11-26 09:06:31 +0200 |
| commit | d102444cac156425e1f154089eb4400ddb581629 (patch) | |
| tree | 81ad792441a2cda803e68a2446c84e525323ced8 /drivers/usb/dwc3 | |
| parent | 0d36dede457873404becd7c9cb9d0f2bcfd0dcd9 (diff) | |
| download | linux-d102444cac156425e1f154089eb4400ddb581629.tar.gz linux-d102444cac156425e1f154089eb4400ddb581629.tar.bz2 linux-d102444cac156425e1f154089eb4400ddb581629.zip | |
usb: dwc3: debugfs: Print/set link state for peripheral mode
Current implementation only prints/sets the link state for peripheral
mode only. Check and prevent printing bogus link state if the current
mode of operation is not peripheral.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
| -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; |