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    Subject[PATCH 1/4] serial: stm32: move tx dma terminate DMA to shutdown
    Date
    Terminate DMA transaction and clear CR3_DMAT when shutdown is requested,
    instead of when remove is requested. If DMA transfer is not stopped in
    shutdown ops, driver will fail to start a new DMA transfer after next
    startup ops.

    Fixes: 3489187204eb ("serial: stm32: adding dma support")

    Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
    Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
    ---
    drivers/tty/serial/stm32-usart.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
    index 3244e7f6818c..6cfc3bec6749 100644
    --- a/drivers/tty/serial/stm32-usart.c
    +++ b/drivers/tty/serial/stm32-usart.c
    @@ -883,6 +883,11 @@ static void stm32_usart_shutdown(struct uart_port *port)
    u32 val, isr;
    int ret;

    + if (stm32_port->tx_dma_busy) {
    + dmaengine_terminate_async(stm32_port->tx_ch);
    + stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
    + }
    +
    /* Disable modem control interrupts */
    stm32_usart_disable_ms(port);

    @@ -1570,7 +1575,6 @@ static int stm32_usart_serial_remove(struct platform_device *pdev)
    writel_relaxed(cr3, port->membase + ofs->cr3);

    if (stm32_port->tx_ch) {
    - dmaengine_terminate_async(stm32_port->tx_ch);
    stm32_usart_of_dma_tx_remove(stm32_port, pdev);
    dma_release_channel(stm32_port->tx_ch);
    }
    --
    2.17.1
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