On 24.02.20 18:16, Schrempf Frieder wrote:
> From: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
>
> On i.MX6 the DMA event for the RX channel of UART6 is '0'. To fix
> the broken DMA support for UART6, we change the check for event_id0
> to include '0' as a valid id.
>
> Fixes: 1ec1e82f2510 ("dmaengine: Add Freescale i.MX SDMA support")
> Cc: stable@vger.kernel
Sorry, I messed up the stable tag. Will send again.
> Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
> ---
> drivers/dma/imx-sdma.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 066b21a32232..3d4aac97b1fc 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -1331,7 +1331,7 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
>
> sdma_channel_synchronize(chan);
>
> - if (sdmac->event_id0)
> + if (sdmac->event_id0 >= 0)
> sdma_event_disable(sdmac, sdmac->event_id0);
> if (sdmac->event_id1)
> sdma_event_disable(sdmac, sdmac->event_id1);
> @@ -1631,7 +1631,7 @@ static int sdma_config(struct dma_chan *chan,
> memcpy(&sdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
>
> /* Set ENBLn earlier to make sure dma request triggered after that */
> - if (sdmac->event_id0) {
> + if (sdmac->event_id0 >= 0) {
> if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
> return -EINVAL;
> sdma_event_enable(sdmac, sdmac->event_id0);
>
