Is there anything else we should address in this patch? Thanks, Roman > -----Original Message----- > From: Scott Branden [mailto:sbranden@xxxxxxxxxxxx] > Sent: August-31-15 9:17 AM > To: John Youn; Greg Kroah-Hartman; linux-usb@xxxxxxxxxxxxxxx; Roman > Bacik > Cc: linux-kernel@xxxxxxxxxxxxxxx; bcm-kernel-feedback-list; Scott Branden > Subject: [PATCH v2 1/1] usb: dwc2: gadget: parity fix in isochronous mode > > From: Roman Bacik <rbacik@xxxxxxxxxxxx> > > USB OTG driver in isochronous mode has to set the parity of the receiving > microframe. The parity is set to even by default. This causes problems for an > audio gadget, if the host starts transmitting on odd microframes. > > This fix uses Incomplete Periodic Transfer interrupt to toggle between even > and odd parity until the Transfer Complete interrupt is received. > > Signed-off-by: Roman Bacik <rbacik@xxxxxxxxxxxx> > Reviewed-by: Abhinav Ratna <aratna@xxxxxxxxxxxx> > Reviewed-by: Srinath Mannam <srinath.mannam@xxxxxxxxxxxx> > Signed-off-by: Scott Branden <sbranden@xxxxxxxxxxxx> > --- > drivers/usb/dwc2/core.h | 1 + > drivers/usb/dwc2/gadget.c | 51 > ++++++++++++++++++++++++++++++++++++++++++++++- > drivers/usb/dwc2/hw.h | 1 + > 3 files changed, 52 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index > 0ed87620..a5634fd 100644 > --- a/drivers/usb/dwc2/core.h > +++ b/drivers/usb/dwc2/core.h > @@ -150,6 +150,7 @@ struct s3c_hsotg_ep { > unsigned int periodic:1; > unsigned int isochronous:1; > unsigned int send_zlp:1; > + unsigned int has_correct_parity:1; > > char name[10]; > }; > diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index > 4d47b7c..fac3e2f 100644 > --- a/drivers/usb/dwc2/gadget.c > +++ b/drivers/usb/dwc2/gadget.c > @@ -1954,6 +1954,7 @@ static void s3c_hsotg_epint(struct dwc2_hsotg > *hsotg, unsigned int idx, > ints &= ~DXEPINT_XFERCOMPL; > > if (ints & DXEPINT_XFERCOMPL) { > + hs_ep->has_correct_parity = 1; > if (hs_ep->isochronous && hs_ep->interval == 1) { > if (ctrl & DXEPCTL_EOFRNUM) > ctrl |= DXEPCTL_SETEVENFR; > @@ -2316,7 +2317,8 @@ void s3c_hsotg_core_init_disconnected(struct > dwc2_hsotg *hsotg, > GINTSTS_CONIDSTSCHNG | GINTSTS_USBRST | > GINTSTS_RESETDET | GINTSTS_ENUMDONE | > GINTSTS_OTGINT | GINTSTS_USBSUSP | > - GINTSTS_WKUPINT, > + GINTSTS_WKUPINT | > + GINTSTS_INCOMPL_SOIN | GINTSTS_INCOMPL_SOOUT, > hsotg->regs + GINTMSK); > > if (using_dma(hsotg)) > @@ -2581,6 +2583,52 @@ irq_retry: > s3c_hsotg_dump(hsotg); > } > > + if (gintsts & GINTSTS_INCOMPL_SOIN) { > + u32 idx, epctl_reg, ctrl; > + struct s3c_hsotg_ep *hs_ep; > + > + dev_dbg(hsotg->dev, "%s: GINTSTS_INCOMPL_SOIN\n", > __func__); > + for (idx = 1; idx < MAX_EPS_CHANNELS; idx++) { > + hs_ep = hsotg->eps_in[idx]; > + > + if (!hs_ep->isochronous || hs_ep- > >has_correct_parity) > + continue; > + > + epctl_reg = DIEPCTL(idx); > + ctrl = readl(hsotg->regs + epctl_reg); > + > + if (ctrl & DXEPCTL_EOFRNUM) > + ctrl |= DXEPCTL_SETEVENFR; > + else > + ctrl |= DXEPCTL_SETODDFR; > + writel(ctrl, hsotg->regs + epctl_reg); > + } > + writel(GINTSTS_INCOMPL_SOIN, hsotg->regs + GINTSTS); > + } > + > + if (gintsts & GINTSTS_INCOMPL_SOOUT) { > + u32 idx, epctl_reg, ctrl; > + struct s3c_hsotg_ep *hs_ep; > + > + dev_dbg(hsotg->dev, "%s: GINTSTS_INCOMPL_SOOUT\n", > __func__); > + for (idx = 1; idx < MAX_EPS_CHANNELS; idx++) { > + hs_ep = hsotg->eps_out[idx]; > + > + if (!hs_ep->isochronous || hs_ep- > >has_correct_parity) > + continue; > + > + epctl_reg = DOEPCTL(idx); > + ctrl = readl(hsotg->regs + epctl_reg); > + > + if (ctrl & DXEPCTL_EOFRNUM) > + ctrl |= DXEPCTL_SETEVENFR; > + else > + ctrl |= DXEPCTL_SETODDFR; > + writel(ctrl, hsotg->regs + epctl_reg); > + } > + writel(GINTSTS_INCOMPL_SOOUT, hsotg->regs + GINTSTS); > + } > + > /* > * if we've had fifo events, we should try and go around the > * loop again to see if there's any point in returning yet. > @@ -2667,6 +2715,7 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep, > hs_ep->periodic = 0; > hs_ep->halted = 0; > hs_ep->interval = desc->bInterval; > + hs_ep->has_correct_parity = 0; > > if (hs_ep->interval > 1 && hs_ep->mc > 1) > dev_err(hsotg->dev, "MC > 1 when interval is not 1\n"); diff - > -git a/drivers/usb/dwc2/hw.h b/drivers/usb/dwc2/hw.h index > d0a5ed8..553f246 100644 > --- a/drivers/usb/dwc2/hw.h > +++ b/drivers/usb/dwc2/hw.h > @@ -142,6 +142,7 @@ > #define GINTSTS_RESETDET (1 << 23) > #define GINTSTS_FET_SUSP (1 << 22) > #define GINTSTS_INCOMPL_IP (1 << 21) > +#define GINTSTS_INCOMPL_SOOUT (1 << 21) > #define GINTSTS_INCOMPL_SOIN (1 << 20) > #define GINTSTS_OEPINT (1 << 19) > #define GINTSTS_IEPINT (1 << 18) > -- > 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
