target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch

   1 From de4356da2cd1a1857513047997d81143cb95a4e1 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
   3 Date: Thu, 24 Mar 2016 14:24:21 +0100
   4 Subject: [PATCH 2/3] serial: imx: let irq handler return IRQ_NONE if no event
   5  was handled
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 This gives the irq core a chance to disable the serial interrupt in case
  11 an event isn't cleared in the handler.
  12
  13 Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
  14 Signed-off-by: Petr Štetiar <ynezz@true.cz>
  15 ---
  16  drivers/tty/serial/imx.c | 17 +++++++++++++----
  17  1 file changed, 13 insertions(+), 4 deletions(-)
  18
  19 --- a/drivers/tty/serial/imx.c
  20 +++ b/drivers/tty/serial/imx.c
  21 @@ -753,6 +753,7 @@ static irqreturn_t imx_int(int irq, void
  22         struct imx_port *sport = dev_id;
  23         unsigned int sts;
  24         unsigned int sts2;
  25 +       irqreturn_t ret = IRQ_NONE;
  26
  27         sts = readl(sport->port.membase + USR1);
  28         sts2 = readl(sport->port.membase + USR2);
  29 @@ -762,26 +763,34 @@ static irqreturn_t imx_int(int irq, void
  30                         imx_dma_rxint(sport);
  31                 else
  32                         imx_rxint(irq, dev_id);
  33 +               ret = IRQ_HANDLED;
  34         }
  35
  36         if ((sts & USR1_TRDY &&
  37              readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) ||
  38             (sts2 & USR2_TXDC &&
  39 -            readl(sport->port.membase + UCR4) & UCR4_TCEN))
  40 +            readl(sport->port.membase + UCR4) & UCR4_TCEN)) {
  41                 imx_txint(irq, dev_id);
  42 +               ret = IRQ_HANDLED;
  43 +       }
  44
  45 -       if (sts & USR1_RTSD)
  46 +       if (sts & USR1_RTSD) {
  47                 imx_rtsint(irq, dev_id);
  48 +               ret = IRQ_HANDLED;
  49 +       }
  50
  51 -       if (sts & USR1_AWAKE)
  52 +       if (sts & USR1_AWAKE) {
  53                 writel(USR1_AWAKE, sport->port.membase + USR1);
  54 +               ret = IRQ_HANDLED;
  55 +       }
  56
  57         if (sts2 & USR2_ORE) {
  58                 sport->port.icount.overrun++;
  59                 writel(USR2_ORE, sport->port.membase + USR2);
  60 +               ret = IRQ_HANDLED;
  61         }
  62
  63 -       return IRQ_HANDLED;
  64 +       return ret;
  65  }
  66
  67  /*