diff options
| author | Stefan Agner <stefan.agner@toradex.com> | 2016-01-22 15:33:21 -0800 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-01-10 23:13:21 +0100 |
| commit | 0d85191ac6663ea3e2ff84d96f20c62144549f27 (patch) | |
| tree | ea80414503ee7d6acb8556ac017714de082323cc | |
| parent | 8ddc702c57a79cf0f4e8334ba6a593b472cfd44a (diff) | |
tty: serial: imx: disable DCD and RI interrupts
If the UART is in DTE mode, the signals DCD and RI are inputs. In
this case, the control bits in UCR3_DCD and UCR3_RI control the
interrupt of those two inputs. The two bits are 1 on reset, hence
leading to an interrupt if one of those signal changes... However,
as of now the interrupt handler does not handle these interrupts,
leading to a interrupt strom.
Solve the issue by explicitly disabling the two interrupts during
initialization.
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
(cherry picked from commit 2d027fec8264daa4cda1bcc81cabb91bd97cde0b)
| -rw-r--r-- | drivers/tty/serial/imx.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 79acc2c6061b..2b87876d0bd9 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1134,6 +1134,13 @@ static int imx_startup(struct uart_port *port) writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); + /* Disable DCDDELT/RIDELT interrupts */ + if (!is_imx1_uart(sport) && sport->dte_mode) { + temp = readl(sport->port.membase + UCR3); + temp &= ~(UCR3_DCD | UCR3_RI); + writel(temp, sport->port.membase + UCR3); + } + /* Reset fifo's and state machines */ i = 100; |