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

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Date:   Mon, 19 Jun 2023 00:48:00 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     Cai Huoqing <cai.huoqing@...ux.dev>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>
Subject: Re: [PATCH 3/9] dmaengine: dw-edma: Add HDMA remote interrupt
 configuration

On Fri, Jun 09, 2023 at 10:16:48AM +0200, Köry Maincent wrote:
> From: Kory Maincent <kory.maincent@...tlin.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@...tlin.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@...il.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
>