Re: [PATCH 3/9] dmaengine: dw-edma: Add HDMA remote interrupt configuration

Serge Semin
2023-06-18T21:48:12Z

On Fri, Jun 09, 2023 at 10:16:48AM +0200, Köry Maincent wrote:
> From: Kory Maincent <kory.maincent@bootlin.com>
>
> Only the local interruption was configured, remote interrupt was left
> behind. This patch fix it by setting stop and abort remote interrupts when
> the DW_EDMA_CHIP_LOCAL flag is not set.
>
> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
> Fixes: e74c39573d35 ("dmaengine: dw-edma: Add support for native HDMA")
> ---
>
> This patch is fixing a commit which is only in dmaengine tree and not
> merged mainline.
> ---
> drivers/dma/dw-edma/dw-hdma-v0-core.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> index da8663f45fdb..7bd1a0f742be 100644
> --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
> +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> @@ -232,6 +232,8 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
> tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) |
> HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
> HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;

> + if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL))
> + tmp |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN;

Seems reasonable especially seeing there is a code with a similar
semantic in the dw_hdma_v0_core_write_chunk() method.

Reviewed-by: Serge Semin <fancer.lancer@gmail.com>

Just curious whether we really need to have the local IRQs left
enabled for the remote device setup... The only case I have in mind is
that it would be useful to signal a remote end-point host of such
event in some application-specific environment. It sounds exotic but
still possible.

-Serge(y)

> SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp);
> /* Channel control */
> SET_CH_32(dw, chan->dir, chan->id, control1, HDMA_V0_LINKLIST_EN);
> --
> 2.25.1
>