[PATCH 2/9] drm/i915: Warn if drm_vblank_get() still works after drm_vblank_off()

[Daniel Vetter]

On Mon, May 26, 2014 at 02:46:25PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 3da73ef..da318a7 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1305,6 +1305,17 @@ static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
>  	}
>  }
>  
> +static void assert_vblank_disabled(struct intel_crtc *crtc)
> +{
> +	struct drm_device *dev = crtc->base.dev;
> +	enum pipe pipe = crtc->pipe;
> +
> +	if (WARN_ON(drm_vblank_get(dev, pipe) == 0)) {
> +		drm_vblank_put(dev, pipe);
> +		drm_vblank_off(dev, pipe);

Imo the _off is too much, since with that it's not just an assert but a
"... and please make it so if not". Imo better to drop that.
-Daniel

> +	}
> +}
> +
>  static void ibx_assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
>  {
>  	u32 val;
> @@ -3885,6 +3896,8 @@ static void intel_crtc_enable_planes(struct drm_crtc *crtc)
>  	int pipe = intel_crtc->pipe;
>  	int plane = intel_crtc->plane;
>  
> +	assert_vblank_disabled(intel_crtc);
> +
>  	intel_enable_primary_hw_plane(dev_priv, plane, pipe);
>  	intel_enable_planes(crtc);
>  	/* The fixup needs to happen before cursor is enabled */
> @@ -3921,6 +3934,8 @@ static void intel_crtc_disable_planes(struct drm_crtc *crtc)
>  	intel_crtc_update_cursor(crtc, false);
>  	intel_disable_planes(crtc);
>  	intel_disable_primary_hw_plane(dev_priv, plane, pipe);
> +
> +	assert_vblank_disabled(intel_crtc);
>  }
>  
>  static void ironlake_crtc_enable(struct drm_crtc *crtc)
> -- 
> 1.8.5.5
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch