On 5/4/2018 10:09 PM, Stefan Wahren wrote:
> Dumping the registers via debugfs makes USB on Raspberry Pi completely
> unusable. The read of register GRXSTSP ("Receive Status Read and Pop
> Register") is responsible for this behaviour, because it pops the RX FIFO.
> So avoid this by omitting the relevant register.
>
> CC: Mian Yousaf Kaukab <[email protected]>
> Fixes: 563cf017c443 ("usb: dwc2: debugfs: add support for complete register
> dump")
> Signed-off-by: Stefan Wahren <[email protected]>
> ---
Acked-by: Minas Harutyunyan <[email protected]>
> drivers/usb/dwc2/debugfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc2/debugfs.c b/drivers/usb/dwc2/debugfs.c
> index 58c691f..d4c0589 100644
> --- a/drivers/usb/dwc2/debugfs.c
> +++ b/drivers/usb/dwc2/debugfs.c
> @@ -368,7 +368,7 @@ static const struct debugfs_reg32 dwc2_regs[] = {
> dump_register(GINTSTS),
> dump_register(GINTMSK),
> dump_register(GRXSTSR),
> - dump_register(GRXSTSP),
> + /* Omit GRXSTSP */
> dump_register(GRXFSIZ),
> dump_register(GNPTXFSIZ),
> dump_register(GNPTXSTS),
>
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