linux-kernel - Re: [PATCH v3 3/3] drm/msm/dpu: capture snapshot on the first commit

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Date: Sun, 25 Feb 2024 11:57:18 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark
	<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Daniel
 Vetter <daniel@...ll.ch>
CC: Steev Klimaszewski <steev@...i.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] drm/msm/dpu: capture snapshot on the first
 commit_done timeout



On 2/25/2024 6:12 AM, Dmitry Baryshkov wrote:
> In order to debug commit_done timeouts, capture the devcoredump state
> when the first timeout occurs after the encoder has been enabled.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 

This looks fine now. Once we discuss patch 2, I can ack this.

> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 30f349c8a1e5..3cae07bf0b9b 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -126,6 +126,8 @@ enum dpu_enc_rc_states {
>    * @base:		drm_encoder base class for registration with DRM
>    * @enc_spinlock:	Virtual-Encoder-Wide Spin Lock for IRQ purposes
>    * @enabled:		True if the encoder is active, protected by enc_lock
> + * @commit_done_timedout: True if there has been a timeout on commit after
> + *			enabling the encoder.
>    * @num_phys_encs:	Actual number of physical encoders contained.
>    * @phys_encs:		Container of physical encoders managed.
>    * @cur_master:		Pointer to the current master in this mode. Optimization
> @@ -172,6 +174,7 @@ struct dpu_encoder_virt {
>   	spinlock_t enc_spinlock;
>   
>   	bool enabled;
> +	bool commit_done_timedout;
>   
>   	unsigned int num_phys_encs;
>   	struct dpu_encoder_phys *phys_encs[MAX_PHYS_ENCODERS_PER_VIRTUAL];
> @@ -1226,6 +1229,8 @@ static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
>   	else if (disp_info->intf_type == INTF_DSI)
>   		dpu_enc->wide_bus_en = msm_dsi_wide_bus_enabled(priv->dsi[index]);
>   
> +	dpu_enc->commit_done_timedout = false;
> +
>   	mutex_lock(&dpu_enc->enc_lock);
>   	cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
>   
> @@ -2436,6 +2441,10 @@ int dpu_encoder_wait_for_commit_done(struct drm_encoder *drm_enc)
>   			DPU_ATRACE_BEGIN("wait_for_commit_done");
>   			ret = phys->ops.wait_for_commit_done(phys);
>   			DPU_ATRACE_END("wait_for_commit_done");
> +			if (ret == -ETIMEDOUT && !dpu_enc->commit_done_timedout) {
> +				dpu_enc->commit_done_timedout = true;
> +				msm_disp_snapshot_state(drm_enc->dev);
> +			}
>   			if (ret)
>   				return ret;
>   		}
>