[Intel-gfx] [PATCH v2 2/2] drm/i915: Also record time difference if vblank evasion fails, v2.

[Daniel Vetter]

On Tue, Sep 01, 2015 at 12:15:33PM +0200, Maarten Lankhorst wrote:
> This makes the error message slightly more useful.
> 
> Changes since v1:
> - Use ktime_get() while irqs are still disabled. (vsyrjala)
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Both applied to dinq, thanks.
-Daniel

> ---
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 63f0d5850cdf..b0c3a3af7ed2 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -563,6 +563,8 @@ struct intel_crtc {
>  	int scanline_offset;
>  
>  	unsigned start_vbl_count;
> +	ktime_t start_vbl_time;
> +
>  	struct intel_crtc_atomic_commit atomic;
>  
>  	/* scalers available on this crtc */
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index 63fba42be2cf..9387af5ef1b8 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -134,6 +134,7 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
>  
>  	drm_crtc_vblank_put(&crtc->base);
>  
> +	crtc->start_vbl_time = ktime_get();
>  	crtc->start_vbl_count = dev->driver->get_vblank_counter(dev, pipe);
>  
>  	trace_i915_pipe_update_vblank_evaded(crtc, min, max,
> @@ -154,14 +155,16 @@ void intel_pipe_update_end(struct intel_crtc *crtc)
>  	struct drm_device *dev = crtc->base.dev;
>  	enum pipe pipe = crtc->pipe;
>  	u32 end_vbl_count = dev->driver->get_vblank_counter(dev, pipe);
> +	ktime_t end_vbl_time = ktime_get();
>  
>  	trace_i915_pipe_update_end(crtc, end_vbl_count);
>  
>  	local_irq_enable();
>  
>  	if (crtc->start_vbl_count && crtc->start_vbl_count != end_vbl_count)
> -		DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
> -			  pipe_name(pipe), crtc->start_vbl_count, end_vbl_count);
> +		DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u) time %lld us\n",
> +			  pipe_name(pipe), crtc->start_vbl_count, end_vbl_count,
> +			  ktime_us_delta(end_vbl_time, crtc->start_vbl_time));
>  }
>  
>  static void
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch