linux-kernel - Re: [PATCH v1 1/2] dmaengine: dw-edma: Add fix to unmask the interrupt bit for HDMA

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Message-ID: <20240717082741.GB2574@thinkpad>
Date: Wed, 17 Jul 2024 13:57:41 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Mrinmay Sarkar <quic_msarkar@...cinc.com>
Cc: fancer.lancer@...il.com, vkoul@...nel.org, quic_shazhuss@...cinc.com,
	quic_nitegupt@...cinc.com, quic_ramkri@...cinc.com,
	quic_nayiluri@...cinc.com, quic_krichai@...cinc.com,
	quic_vbadigan@...cinc.com, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dmaengine: dw-edma: Add fix to unmask the
 interrupt bit for HDMA

On Fri, Jul 05, 2024 at 07:25:32PM +0530, Mrinmay Sarkar wrote:

Subject should be,

dmaengine: dw-edma: Fix unmasking STOP and ABORT interrupts for HDMA

> The current logic is enabling both STOP_INT_MASK and ABORT_INT_MASK
> bit. This is apparently masking those particular interrupt rather than

s/interrupt/interrupts

> unmasking the same.
> 

Please add the implications of this issue. I guess if the interrupts are masked,
they would never get triggered.

> This change will reset STOP_INT_MASK and ABORT_INT_MASK bit and unmask
> these interrupts.
> 

How about,

So fix the issue by unmasking the STOP and ABORT interrupts properly.

> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>

Please add fixes tag and CC stable as this is a potential bug fix.

> ---
>  drivers/dma/dw-edma/dw-hdma-v0-core.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> index 10e8f07..88bd652f 100644
> --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
> +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> @@ -247,10 +247,11 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
>  	if (first) {
>  		/* Enable engine */
>  		SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
> -		/* Interrupt enable&unmask - done, abort */
> -		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;
> +		/* Interrupt unmask - done, abort */

There is no done interrupt in HDMA, only STOP. So use STOP, ABORT here and
below.

- Mani

-- 
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