[PATCH] drm/msm/dpu: Capture dpu snapshot when frame_done_timer timeouts

[Dmitry Baryshkov]

On Tue, 28 Nov 2023 at 03:12, Paloma Arellano <quic_parellan at quicinc.com> wrote:
>
> Trigger a devcoredump to dump dpu registers and capture the drm atomic
> state when the frame_done_timer timeouts.
>
> Signed-off-by: Paloma Arellano <quic_parellan at quicinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 1cf7ff6caff4..5cf7594feb5a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -191,6 +191,7 @@ struct dpu_encoder_virt {
>         void *crtc_frame_event_cb_data;
>
>         atomic_t frame_done_timeout_ms;
> +       atomic_t frame_done_timeout_cnt;
>         struct timer_list frame_done_timer;
>
>         struct msm_display_info disp_info;
> @@ -1204,6 +1205,8 @@ static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
>
>         dpu_enc->dsc = dpu_encoder_get_dsc_config(drm_enc);
>
> +       atomic_set(&dpu_enc->frame_done_timeout_cnt, 0);
> +
>         if (disp_info->intf_type == INTF_DP)
>                 dpu_enc->wide_bus_en = msm_dp_wide_bus_available(priv->dp[index]);
>         else if (disp_info->intf_type == INTF_DSI)
> @@ -2115,11 +2118,12 @@ static int _dpu_encoder_status_show(struct seq_file *s, void *data)
>         for (i = 0; i < dpu_enc->num_phys_encs; i++) {
>                 struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
>
> -               seq_printf(s, "intf:%d  wb:%d  vsync:%8d     underrun:%8d    ",
> +               seq_printf(s, "intf:%d  wb:%d  vsync:%8d     underrun:%8d    frame_done_cnt:%d",
>                                 phys->hw_intf ? phys->hw_intf->idx - INTF_0 : -1,
>                                 phys->hw_wb ? phys->hw_wb->idx - WB_0 : -1,
>                                 atomic_read(&phys->vsync_cnt),
> -                               atomic_read(&phys->underrun_cnt));
> +                               atomic_read(&phys->underrun_cnt),
> +                               atomic_read(&dpu_enc->frame_done_timeout_cnt));
>
>                 seq_printf(s, "mode: %s\n", dpu_encoder_helper_get_intf_type(phys->intf_mode));
>         }
> @@ -2341,6 +2345,10 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
>
>         DPU_ERROR_ENC(dpu_enc, "frame done timeout\n");
>
> +       atomic_inc(&dpu_enc->frame_done_timeout_cnt);
> +       if (atomic_read(&dpu_enc->frame_done_timeout_cnt) == 1)
> +               msm_disp_snapshot_state(drm_enc->dev);

atomic_inc_and_test(), please

> +
>         event = DPU_ENCODER_FRAME_EVENT_ERROR;
>         trace_dpu_enc_frame_done_timeout(DRMID(drm_enc), event);
>         dpu_enc->crtc_frame_event_cb(dpu_enc->crtc_frame_event_cb_data, event);
> @@ -2392,6 +2400,7 @@ struct drm_encoder *dpu_encoder_init(struct drm_device *dev,
>                 goto fail;
>
>         atomic_set(&dpu_enc->frame_done_timeout_ms, 0);
> +       atomic_set(&dpu_enc->frame_done_timeout_cnt, 0);
>         timer_setup(&dpu_enc->frame_done_timer,
>                         dpu_encoder_frame_done_timeout, 0);
>
> --
> 2.41.0
>


-- 
With best wishes
Dmitry