[PATCH v2 2/9] drm/i915: Warn if drm_vblank_get() still works after drm_vblank_off()

[Daniel Vetter]

On Mon, May 26, 2014 at 04:49:28PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> v2: Drop the drm_vblank_off() (Daniel)
>     Use drm_crtc_vblank_{get,put}()
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 3da73ef..94ac51f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1305,6 +1305,12 @@ static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
>  	}
>  }
>  
> +static void assert_vblank_disabled(struct drm_crtc *crtc)
> +{
> +	if (WARN_ON(drm_crtc_vblank_get(crtc) == 0))
> +		drm_crtc_vblank_put(crtc);
> +}
> +
>  static void ibx_assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
>  {
>  	u32 val;
> @@ -3885,6 +3891,8 @@ static void intel_crtc_enable_planes(struct drm_crtc *crtc)
>  	int pipe = intel_crtc->pipe;
>  	int plane = intel_crtc->plane;
>  
> +	assert_vblank_disabled(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 +3929,8 @@ 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(crtc);
>  }
>  
>  static void ironlake_crtc_enable(struct drm_crtc *crtc)
> -- 
> 1.8.5.5
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch