diff options
| author | Andrey Smirnov <[email protected]> | 2019-08-05 11:57:01 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2019-09-04 12:43:51 +0200 |
| commit | 6798e901ab237ae51a3d192d571ec1e462e962b5 (patch) | |
| tree | 6546f751105246d01130795a80020a5ef2ec21fd | |
| parent | f7ec1721b38c82089b1bbd92f828cb615557cbc5 (diff) | |
tty: serial: fsl_lpuart: Ignore TX/RX interrupts if DMA is enabled
In a mixed DMA/IRQ use-case (e.g.: DMA for TX, IRQ for RX), interrupt
handler might try to handle Rx/Tx condition it shouldn't. Change the
code to only handle TX/RX event if corresponding path isn't being
handled by DMA.
Signed-off-by: Andrey Smirnov <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Cory Tusar <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 5c3cc1051aa8..3e17bb8a0b16 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -967,10 +967,10 @@ static irqreturn_t lpuart_int(int irq, void *dev_id) sts = readb(sport->port.membase + UARTSR1); - if (sts & UARTSR1_RDRF) + if (sts & UARTSR1_RDRF && !sport->lpuart_dma_rx_use) lpuart_rxint(sport); - if (sts & UARTSR1_TDRE) + if (sts & UARTSR1_TDRE && !sport->lpuart_dma_tx_use) lpuart_txint(sport); return IRQ_HANDLED; |