On 06/23/2014 09:11 AM, Zhao Qiang wrote: > when flexcan is not physically linked, command 'cantest' will > trigger an err_irq, add err_irq handler for it. > > Signed-off-by: Zhao Qiang <b45...@freescale.com> > --- > Changes for v2: > - use a space instead of tab > - use flexcan_poll_state instead of print > Changes for v3: > - return IRQ_HANDLED if err is triggered > - stop transmitted packets when there is an err_interrupt > > drivers/net/can/flexcan.c | 35 ++++++++++++++++++++++++++++++++++- > 1 file changed, 34 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c > index f425ec2..6802a25 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -208,6 +208,7 @@ struct flexcan_priv { > void __iomem *base; > u32 reg_esr; > u32 reg_ctrl_default; > + unsigned int err_irq; > > struct clk *clk_ipg; > struct clk *clk_per; > @@ -744,6 +745,24 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) > return IRQ_HANDLED; > } > > +static irqreturn_t flexcan_err_irq(int irq, void *dev_id) > +{ > + struct net_device *dev = dev_id; > + struct flexcan_priv *priv = netdev_priv(dev); > + struct flexcan_regs __iomem *regs = priv->base; > + u32 reg_ctrl, reg_esr; > + > + reg_esr = flexcan_read(®s->esr); > + reg_ctrl = flexcan_read(®s->ctrl); > + if (reg_esr & FLEXCAN_ESR_TX_WRN) {
When does the hardware trigger the interrupt? > + flexcan_write(reg_esr & ~FLEXCAN_ESR_TX_WRN, ®s->esr); > + flexcan_write(reg_ctrl & ~FLEXCAN_CTRL_ERR_MSK, ®s->ctrl); > + netif_stop_queue(dev); Why are you stopping the txqueue? > + return IRQ_HANDLED; > + } > + return IRQ_NONE; > +} > + Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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