linux-kernel - Re: [PATCH] drm/msm/dpu: fix encoder irq wait skip

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Message-ID: <389f63a0-c00f-719b-085f-d562c2b5da08@quicinc.com>
Date: Thu, 9 May 2024 12:27:10 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Barnabás Czémán <trabarni@...il.com>,
        Rob Clark
	<robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean
 Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David
 Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/dpu: fix encoder irq wait skip



On 5/9/2024 10:39 AM, Barnabás Czémán wrote:
> The irq_idx is unsigned so it cannot be lower than zero, better
> to change the condition to check if it is equal with zero.
> It could not cause any issue because a valid irq index starts from one.
> 
> Signed-off-by: Barnabás Czémán <trabarni@...il.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 

I think we also need

Fixes: 5a9d50150c2c ("drm/msm/dpu: shift IRQ indices by 1")

With that,

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 119f3ea50a7c..cf7d769ab3b9 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -428,7 +428,7 @@ int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
>   		return -EWOULDBLOCK;
>   	}
>   
> -	if (irq_idx < 0) {
> +	if (irq_idx == 0) {
>   		DRM_DEBUG_KMS("skip irq wait id=%u, callback=%ps\n",
>   			      DRMID(phys_enc->parent), func);
>   		return 0;
> 
> ---
> base-commit: 704ba27ac55579704ba1289392448b0c66b56258
> change-id: 20240509-irq_wait-49444cea77e2
> 
> Best regards,