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Date: Thu, 3 Sep 2015 18:47:55 +0000
From: Roman Bacik <rbacik@...adcom.com>
To: Scott Branden <sbranden@...adcom.com>,
John Youn <johnyoun@...opsys.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
"Scott Branden" <sbranden@...adcom.com>
Subject: RE: [PATCH v2 1/1] usb: dwc2: gadget: parity fix in isochronous mode
Is there anything else we should address in this patch?
Thanks,
Roman
> -----Original Message-----
> From: Scott Branden [mailto:sbranden@...adcom.com]
> Sent: August-31-15 9:17 AM
> To: John Youn; Greg Kroah-Hartman; linux-usb@...r.kernel.org; Roman
> Bacik
> Cc: linux-kernel@...r.kernel.org; bcm-kernel-feedback-list; Scott Branden
> Subject: [PATCH v2 1/1] usb: dwc2: gadget: parity fix in isochronous mode
>
> From: Roman Bacik <rbacik@...adcom.com>
>
> 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@...adcom.com>
> Reviewed-by: Abhinav Ratna <aratna@...adcom.com>
> Reviewed-by: Srinath Mannam <srinath.mannam@...adcom.com>
> Signed-off-by: Scott Branden <sbranden@...adcom.com>
> ---
> 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
--
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