diff options
Diffstat (limited to 'target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch')
| -rw-r--r-- | target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch b/target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch new file mode 100644 index 0000000000..0b803b7bda --- /dev/null +++ b/target/linux/imx6/patches-4.4/112-serial-imx-let-irq-handler-return-IRQ_NONE-if-no-eve.patch @@ -0,0 +1,72 @@ +From de4356da2cd1a1857513047997d81143cb95a4e1 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de> +Date: Thu, 24 Mar 2016 14:24:21 +0100 +Subject: [PATCH 2/3] serial: imx: let irq handler return IRQ_NONE if no event + was handled +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This gives the irq core a chance to disable the serial interrupt in case +an event isn't cleared in the handler. + +Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> +Signed-off-by: Petr Štetiar <ynezz@true.cz> +--- + drivers/tty/serial/imx.c | 17 +++++++++++++---- + 1 file changed, 13 insertions(+), 4 deletions(-) + +diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c +index bfc4555..5ced61e 100644 +--- a/drivers/tty/serial/imx.c ++++ b/drivers/tty/serial/imx.c +@@ -734,6 +734,7 @@ static irqreturn_t imx_int(int irq, void *dev_id) + struct imx_port *sport = dev_id; + unsigned int sts; + unsigned int sts2; ++ irqreturn_t ret = IRQ_NONE; + + sts = readl(sport->port.membase + USR1); + sts2 = readl(sport->port.membase + USR2); +@@ -743,26 +744,34 @@ static irqreturn_t imx_int(int irq, void *dev_id) + imx_dma_rxint(sport); + else + imx_rxint(irq, dev_id); ++ ret = IRQ_HANDLED; + } + + if ((sts & USR1_TRDY && + readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) || + (sts2 & USR2_TXDC && +- readl(sport->port.membase + UCR4) & UCR4_TCEN)) ++ readl(sport->port.membase + UCR4) & UCR4_TCEN)) { + imx_txint(irq, dev_id); ++ ret = IRQ_HANDLED; ++ } + +- if (sts & USR1_RTSD) ++ if (sts & USR1_RTSD) { + imx_rtsint(irq, dev_id); ++ ret = IRQ_HANDLED; ++ } + +- if (sts & USR1_AWAKE) ++ if (sts & USR1_AWAKE) { + writel(USR1_AWAKE, sport->port.membase + USR1); ++ ret = IRQ_HANDLED; ++ } + + if (sts2 & USR2_ORE) { + sport->port.icount.overrun++; + writel(USR2_ORE, sport->port.membase + USR2); ++ ret = IRQ_HANDLED; + } + +- return IRQ_HANDLED; ++ return ret; + } + + /* +-- +1.9.1 + |