From ae79dd5dddb6fa4051c96c7f14116ded9e0dbdd7 Mon Sep 17 00:00:00 2001 From: Vahram Aharonyan Date: Mon, 14 Nov 2016 19:16:51 -0800 Subject: [PATCH] usb: dwc2: gadget: Correct dwc2_hsotg_ep_stop_xfr() function Correct dwc2_hsotg_ep_stop_xfr() function to follow dwc2 programming guide for setting NAK on specific endpoint, disabling it and flushing corresponding FIFO. Current code does not take into account whether core acts in shared or dedicated FIFO mode, current endpoint is periodic or not. It does not clear EPDISBLD interrupt after programming of DXEPCTL_EPDIS, does not flush shared TX FIFO and tries to clear global out NAK in wrong manner instead of setting DCTL_CGOUTNAK. Signed-off-by: Vahram Aharonyan Signed-off-by: John Youn Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/gadget.c | 64 +++++++++++++++++++++++++-------------- 1 file changed, 41 insertions(+), 23 deletions(-) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 5930b1a3c8f0..143577be031e 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3867,23 +3867,35 @@ static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg, DOEPINT(hs_ep->index); dev_dbg(hsotg->dev, "%s: stopping transfer on %s\n", __func__, - hs_ep->name); + hs_ep->name); + if (hs_ep->dir_in) { - __orr32(hsotg->regs + epctrl_reg, DXEPCTL_SNAK); - /* Wait for Nak effect */ - if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, - DXEPINT_INEPNAKEFF, 100)) - dev_warn(hsotg->dev, - "%s: timeout DIEPINT.NAKEFF\n", __func__); + if (hsotg->dedicated_fifos || hs_ep->periodic) { + __orr32(hsotg->regs + epctrl_reg, DXEPCTL_SNAK); + /* Wait for Nak effect */ + if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, + DXEPINT_INEPNAKEFF, 100)) + dev_warn(hsotg->dev, + "%s: timeout DIEPINT.NAKEFF\n", + __func__); + } else { + __orr32(hsotg->regs + DCTL, DCTL_SGNPINNAK); + /* Wait for Nak effect */ + if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, + GINTSTS_GINNAKEFF, 100)) + dev_warn(hsotg->dev, + "%s: timeout GINTSTS.GINNAKEFF\n", + __func__); + } } else { if (!(dwc2_readl(hsotg->regs + GINTSTS) & GINTSTS_GOUTNAKEFF)) __orr32(hsotg->regs + DCTL, DCTL_SGOUTNAK); /* Wait for global nak to take effect */ if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, - GINTSTS_GOUTNAKEFF, 100)) - dev_warn(hsotg->dev, - "%s: timeout GINTSTS.GOUTNAKEFF\n", __func__); + GINTSTS_GOUTNAKEFF, 100)) + dev_warn(hsotg->dev, "%s: timeout GINTSTS.GOUTNAKEFF\n", + __func__); } /* Disable ep */ @@ -3892,23 +3904,29 @@ static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg, /* Wait for ep to be disabled */ if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, DXEPINT_EPDISBLD, 100)) dev_warn(hsotg->dev, - "%s: timeout DOEPCTL.EPDisable\n", __func__); + "%s: timeout DOEPCTL.EPDisable\n", __func__); + + /* Clear EPDISBLD interrupt */ + __orr32(hsotg->regs + epint_reg, DXEPINT_EPDISBLD); if (hs_ep->dir_in) { - if (hsotg->dedicated_fifos) { - dwc2_writel(GRSTCTL_TXFNUM(hs_ep->fifo_index) | - GRSTCTL_TXFFLSH, hsotg->regs + GRSTCTL); - /* Wait for fifo flush */ - if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, - GRSTCTL_TXFFLSH, 100)) - dev_warn(hsotg->dev, - "%s: timeout flushing fifos\n", - __func__); - } - /* TODO: Flush shared tx fifo */ + unsigned short fifo_index; + + if (hsotg->dedicated_fifos || hs_ep->periodic) + fifo_index = hs_ep->fifo_index; + else + fifo_index = 0; + + /* Flush TX FIFO */ + dwc2_flush_tx_fifo(hsotg, fifo_index); + + /* Clear Global In NP NAK in Shared FIFO for non periodic ep */ + if (!hsotg->dedicated_fifos && !hs_ep->periodic) + __orr32(hsotg->regs + DCTL, DCTL_CGNPINNAK); + } else { /* Remove global NAKs */ - __bic32(hsotg->regs + DCTL, DCTL_SGOUTNAK); + __orr32(hsotg->regs + DCTL, DCTL_CGOUTNAK); } } -- 2.20.1