linux-kernel - Re: [PATCH v2] drm/msm/dpu: fix encoder irq wait skip

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Date: Thu, 9 May 2024 23:42:49 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Barnabás Czémán <trabarni@...il.com>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dpu: fix encoder irq wait skip

On Thu, 9 May 2024 at 22:40, Barnabás Czémán <trabarni@...ilcom> 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.
>
> Fixes: 5a9d50150c2c ("drm/msm/dpu: shift IRQ indices by 1")
> Signed-off-by: Barnabás Czémán <trabarni@...il.com>

In the previous revision you have got the Reviewed-by tag, which you
didn't include here for some reason.


This revision is:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Note, there is no need to send a next iteration just for these tags.
They usually get picked up by the patch management software (including
the Fixes tag).


> ---
> Changes in v2:
> - Add Fixes in commit message.
> - Link to v1: https://lore.kernel.org/r/20240509-irq_wait-v1-1-41d653e3784e@gmail.com
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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,
> --
> Barnabás Czémán <trabarni@...il.com>
>


--
With best wishes
Dmitry