> -----Original Message----- > From: Felipe Balbi [mailto:ba...@kernel.org] > Sent: 2019年8月8日 13:07 > To: Yinbo Zhu <yinbo....@nxp.com>; Greg Kroah-Hartman > <gre...@linuxfoundation.org>; linux-usb@vger.kernel.org; open list > <linux-ker...@vger.kernel.org> > Cc: Yinbo Zhu <yinbo....@nxp.com>; Xiaobo Xie <xiaobo....@nxp.com>; Jiafei > Pan <jiafei....@nxp.com>; Ran Wang <ran.wan...@nxp.com> > Subject: [EXT] Re: [PATCH v1] usb: dwc3: remove the call trace of USBx_GFLADJ > > Caution: EXT Email > > Hi, > > Yinbo Zhu <yinbo....@nxp.com> writes: > > > layerscape board sometimes reported some usb call trace, that is due > > to kernel sent LPM tokerns automatically when it has no pending > > transfers and think that the link is idle enough to enter L1, which > > procedure will ask usb register has a recovery,then kernel will > > compare USBx_GFLADJ and set GFLADJ_30MHZ, GFLADJ_30MHZ_REG until > > GFLADJ_30MHZ is equal 0x20, if the conditions were met then issue > > occur, but whatever the conditions whether were met that usb is all > > need keep GFLADJ_30MHZ of value is 0x20 (xhci spec ask use > > GFLADJ_30MHZ to adjust any offset from clock source that generates the > > clock that drives the SOF counter, 0x20 is default value of it)That is > > normal logic, > so need remove the call trace. > > > > Signed-off-by: Yinbo Zhu <yinbo....@nxp.com> > > --- > > drivers/usb/dwc3/core.c | 3 +-- > > 1 file changed, 1 insertion(+), 2 deletions(-) > > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index > > 98bce85c29d0..a133d8490322 100644 > > --- a/drivers/usb/dwc3/core.c > > +++ b/drivers/usb/dwc3/core.c > > @@ -300,8 +300,7 @@ static void dwc3_frame_length_adjustment(struct > > dwc3 *dwc) > > > > reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); > > dft = reg & DWC3_GFLADJ_30MHZ_MASK; > > - if (!dev_WARN_ONCE(dwc->dev, dft == dwc->fladj, > > - "request value same as default, ignoring\n")) { > > + if (dft != dwc->fladj) { > > if the value isn't different, why do you want to change it? > > -- > Balbi Hi Balbi,
I don't change any value. I was remove that call trace. In addition that GFLADJ_30MHZ value intial value is 0, and it's value must be 0x20, if not, usb will not work. Regards, Yinbo
