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| author | Sherry Sun <sherry.sun@nxp.com> | 2022-11-25 18:19:52 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 15:05:33 +0100 |
| commit | 1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e (patch) | |
| tree | d072386c73bfe2ef5a225cedd5ed0763aead0d62 | |
| parent | e1d91dda0bd1b96c10ea5d85fee94021c70dd55b (diff) | |
| download | linux-1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e.tar.gz linux-1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e.tar.bz2 linux-1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e.zip | |
tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown()
UARTBAUD_RDMAE and UARTBAUD_TDMAE are enabled in lpuart32_startup(), but
lpuart32_shutdown() not disable them, only free the dma ring buffer and
release the dma channels, so here disable the Rx/Tx DMA first in
lpuart32_shutdown().
Fixes: 42b68768e51b ("serial: fsl_lpuart: DMA support for 32-bit variant")
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 9b8d32262f1e..88697ddcd8c4 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1799,6 +1799,11 @@ static void lpuart32_shutdown(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); + /* disable Rx/Tx DMA */ + temp = lpuart32_read(port, UARTBAUD); + temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE); + lpuart32_write(port, temp, UARTBAUD); + /* disable Rx/Tx and interrupts */ temp = lpuart32_read(port, UARTCTRL); temp &= ~(UARTCTRL_TE | UARTCTRL_RE | UARTCTRL_ILIE | |