Hello Sherry,
On 03.08.22 08:57, Sherry Sun wrote:
> Since commit 824a0a02cd74 ("dmaengine: imx-sdma: Add multi fifo support")
> adds the use of dma_slave_config->peripheral_config/peripheral_size to
> sdma driver, the client drivers like uart need to initialize the
> peripheral_config/peripheral_size for sdma, otherwise, the random value
> of local variable slave_config may cause unexpected peripheral_config
> and make sdma mess up.
>
If this a fix, please add a Fixes: tag. I am not sure it is though,
see below.
> Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
> ---
> drivers/tty/serial/imx.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 522445a8f666..bb8c2a712e94 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -1320,6 +1320,8 @@ static int imx_uart_dma_init(struct imx_port *sport)
This function starts with
struct dma_slave_config slave_config = {};
> slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> /* one byte less than the watermark level to enable the aging timer */
> slave_config.src_maxburst = RXTL_DMA - 1;
> + slave_config.peripheral_config = NULL;
> + slave_config.peripheral_size = 0;
So these are already zero-initialized.
> ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config);
> if (ret) {
> dev_err(dev, "error in RX dma configuration.\n");
> @@ -1346,6 +1348,8 @@ static int imx_uart_dma_init(struct imx_port *sport)
> slave_config.dst_addr = sport->port.mapbase + URTX0;
> slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> slave_config.dst_maxburst = TXTL_DMA;
> + slave_config.peripheral_config = NULL;
> + slave_config.peripheral_size = 0;
Not sure if this is required. If preceding dmaengine_slave_config()
indeed makes clearing necessary, you should note that in the commit
message.
Cheers,
Ahmad
> ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config);
> if (ret) {
> dev_err(dev, "error in TX dma configuration.");
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