Sorry, please ignore this one. Forgot to rebase.
Regards,
-Bin.
> -----Original Message-----
> From: Liu, Bin
> Sent: Friday, March 20, 2015 4:45 PM
> To: linux-usb@xxxxxxxxxxxxxxx
> Cc: Balbi, Felipe; Liu, Bin
> Subject: [PATCH] usb: musb: only set test mode once
>
> The MUSB test mode register can only be set once, otherwise the result is
> undefined.
>
> This prevents the debugfs testmode entry to set the register more than once
> which causes test failure.
>
> Signed-off-by: Bin Liu <b-liu@xxxxxx>
> ---
> drivers/usb/musb/musb_debugfs.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/musb/musb_debugfs.c
> b/drivers/usb/musb/musb_debugfs.c index 179d885..7119639 100644
> --- a/drivers/usb/musb/musb_debugfs.c
> +++ b/drivers/usb/musb/musb_debugfs.c
> @@ -189,6 +189,12 @@ static ssize_t musb_test_mode_write(struct file *file,
> u8 test = 0;
> char buf[18];
>
> + test = musb_readb(musb->mregs, MUSB_TESTMODE);
> + if (test) {
> + dev_err(musb->controller, "Error: test mode is running\n");
> + return -EINVAL;
> + }
> +
> memset(buf, 0x00, sizeof(buf));
>
> if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
> --
> 1.8.4
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