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

[Jeykumar Sankaran <jsanka@codeaurora.org>]

On 2019-01-28 12:42, Sean Paul wrote:
> From: Sean Paul <seanpaul@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@chromium.org>
> ---

Reviewed-by: Jeykumar Sankaran <jsanka@codeaurora.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);

-- 
Jeykumar S
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