Felipe,
> -----Original Message-----
> From: Liu, Bin
> Sent: Thursday, April 02, 2015 11:45 AM
> To: linux-usb@vger.kernel.org
> Cc: Balbi, Felipe
> Subject: RE: [PATCH v2] usb: musb: only set test mode once
>
> Felipe,
>
> > -----Original Message-----
> > From: Liu, Bin
> > Sent: Tuesday, March 24, 2015 3:09 PM
> > To: linux-usb@vger.kernel.org
> > Cc: Balbi, Felipe; Liu, Bin
> > Subject: [PATCH v2] 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-...@ti.com>
>
> I see you have not picked up this patch yet. Can you please hold on it?
>
> I noticed only the USB2.0 Specs mentioned about USB reset to exit test mode,
> but not in the MUSB data manual.
>
> I am guessing running multiple 'test packet' command causing incorrect test
> packets is due to the driver loading the test packets into EP0 FIFO multiple
> times.
> I simply masked this then the analyzer trace shows the test packets are
> correct
> even after ran 'test packet' command multiple times.
>
> I will have to hook up a scope to measure the signal to ensure the DP/DM
> signals
> are still correct after run each test mode command multiple times for MUSB.
> If so,
> then the patch we need is to ensure not loading the test packet to FIFO
> multiple
> times.
Sorry for the noise. This patch is still valid. Switching test mode without
reset fails on MUSB.
Regards,
-Bin.
>
> Regards,
> -Bin.
>
> > ---
> > v2: revise the dev_err message.
> >
> > drivers/usb/musb/musb_debugfs.c | 9 ++++++++-
> > 1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/musb/musb_debugfs.c
> > b/drivers/usb/musb/musb_debugfs.c index 78a283e..04382ec 100644
> > --- a/drivers/usb/musb/musb_debugfs.c
> > +++ b/drivers/usb/musb/musb_debugfs.c
> > @@ -191,9 +191,16 @@ static ssize_t musb_test_mode_write(struct file *file,
> > {
> > struct seq_file *s = file->private_data;
> > struct musb *musb = s->private;
> > - u8 test = 0;
> > + u8 test;
> > char buf[18];
> >
> > + test = musb_readb(musb->mregs, MUSB_TESTMODE);
> > + if (test) {
> > + dev_err(musb->controller, "Error: test mode is already set. "
> > + "Please do USB Bus Reset to start a new test.\n");
> > + return count;
> > + }
> > +
> > 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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