[Freedreno] [PATCH 4/4] drm/msm: dpu: Don't queue the frame_done watchdog for cursor

[Fritz Koenig]

On Mon, Jan 28, 2019 at 12:43 PM Sean Paul <sean at poorly.run> wrote:
>
> From: Sean Paul <seanpaul at chromium.org>
>
> In the case of an async/cursor update, we don't wait for the frame_done
> event, which means handle_frame_done is never called, and the frame_done
> watchdog isn't canceled. Currently, this results in a frame_done timeout
> every time the cursor moves without a synchronous frame following it up
> before the timeout expires. Since we don't wait for frame_done, and
> don't handle it, we shouldn't modify the watchdog.
>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 51e46b206c73e..05145cf9fb408 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1794,7 +1794,6 @@ void dpu_encoder_kickoff(struct drm_encoder *drm_enc, bool async)
>  {
>         struct dpu_encoder_virt *dpu_enc;
>         struct dpu_encoder_phys *phys;
> -       unsigned long timeout_ms;
>         ktime_t wakeup_time;
>         unsigned int i;
>
> @@ -1807,12 +1806,20 @@ void dpu_encoder_kickoff(struct drm_encoder *drm_enc, bool async)
>
>         trace_dpu_enc_kickoff(DRMID(drm_enc));
>
> -       timeout_ms = DPU_ENCODER_FRAME_DONE_TIMEOUT_FRAMES * 1000 /
> -               drm_mode_vrefresh(&drm_enc->crtc->state->adjusted_mode);
> +       /*
> +        * Asynchronous frames don't handle FRAME_DONE events. As such, they
> +        * shouldn't enable the frame_done watchdog since it will always time
> +        * out.
> +        */
> +       if (!async) {
> +               unsigned long timeout_ms;
> +               timeout_ms = DPU_ENCODER_FRAME_DONE_TIMEOUT_FRAMES * 1000 /
> +                       drm_mode_vrefresh(&drm_enc->crtc->state->adjusted_mode);
>
> -       atomic_set(&dpu_enc->frame_done_timeout_ms, timeout_ms);
> -       mod_timer(&dpu_enc->frame_done_timer,
> -                 jiffies + msecs_to_jiffies(timeout_ms));
> +               atomic_set(&dpu_enc->frame_done_timeout_ms, timeout_ms);
> +               mod_timer(&dpu_enc->frame_done_timer,
> +                         jiffies + msecs_to_jiffies(timeout_ms));
> +       }
>
>         /* All phys encs are ready to go, trigger the kickoff */
>         _dpu_encoder_kickoff_phys(dpu_enc, async);
> --
> Sean Paul, Software Engineer, Google / Chromium OS
>

Reviewed-by: Fritz Koenig <frkoenig at google.com>

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