diff options
Diffstat (limited to 'target/linux/imx6/patches-4.4/113-serial-imx-make-sure-unhandled-irqs-are-disabled.patch')
| -rw-r--r-- | target/linux/imx6/patches-4.4/113-serial-imx-make-sure-unhandled-irqs-are-disabled.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-4.4/113-serial-imx-make-sure-unhandled-irqs-are-disabled.patch b/target/linux/imx6/patches-4.4/113-serial-imx-make-sure-unhandled-irqs-are-disabled.patch new file mode 100644 index 0000000..8978d33 --- /dev/null +++ b/target/linux/imx6/patches-4.4/113-serial-imx-make-sure-unhandled-irqs-are-disabled.patch @@ -0,0 +1,61 @@ +From a58c6360b9eb3a2374b0b069ba9ce7baec0f26df 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 14:24:22 +0100 +Subject: [PATCH 3/3] serial: imx: make sure unhandled irqs are disabled +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Make sure that events that are not handled in the irq function don't +trigger an interrupt. + +When the serial port is operated in DTE mode, the events for DCD and RI +events are enabled after a system reset by default. + +Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> +Signed-off-by: Petr Štetiar <ynezz@true.cz> +--- + drivers/tty/serial/imx.c | 23 ++++++++++++++++++++++- + 1 file changed, 22 insertions(+), 1 deletion(-) + +diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c +index 5ced61e..fcd48fd 100644 +--- a/drivers/tty/serial/imx.c ++++ b/drivers/tty/serial/imx.c +@@ -1221,11 +1221,32 @@ static int imx_startup(struct uart_port *port) + temp |= (UCR2_RXEN | UCR2_TXEN); + if (!sport->have_rtscts) + temp |= UCR2_IRTS; ++ /* ++ * make sure the edge sensitive RTS-irq is disabled, ++ * we're using RTSD instead. ++ */ ++ if (!is_imx1_uart(sport)) ++ temp &= ~UCR2_RTSEN; + writel(temp, sport->port.membase + UCR2); + + if (!is_imx1_uart(sport)) { + temp = readl(sport->port.membase + UCR3); +- temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; ++ ++ /* ++ * The effect of RI and DCD differs depending on the UFCR_DCEDTE ++ * bit. In DCE mode they control the outputs, in DTE mode they ++ * enable the respective irqs. At least the DCD irq cannot be ++ * cleared on i.MX25 at least, so it's not usable and must be ++ * disabled. I don't have test hardware to check if RI has the ++ * same problem but I consider this likely so it's disabled for ++ * now, too. ++ */ ++ temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP | ++ UCR3_RI | UCR3_DCD; ++ ++ if (sport->dte_mode) ++ temp &= ~(UCR3_RI | UCR3_DCD); ++ + writel(temp, sport->port.membase + UCR3); + } + +-- +1.9.1 + |