Re: [PATCH v2 16/27] drm/i915: move detaching scalers to begin_crtc_commit, v2.

[Matt Roper <matthew.d.roper@intel.com>]

On Thu, Jun 04, 2015 at 02:47:46PM +0200, Maarten Lankhorst wrote:
> This is probably intended to be be done during vblank evasion.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_atomic.c  | 3 ---
>  drivers/gpu/drm/i915/intel_display.c | 8 ++++----
>  drivers/gpu/drm/i915/intel_drv.h     | 1 -
>  3 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> index 7ca225194b7c..8447a1fef332 100644
> --- a/drivers/gpu/drm/i915/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> @@ -144,9 +144,6 @@ int intel_atomic_commit(struct drm_device *dev,
>  	for_each_crtc_in_state(state, crtc, crtc_state, i) {
>  		to_intel_crtc(crtc)->config = to_intel_crtc_state(crtc->state);
>  
> -		if (INTEL_INFO(dev)->gen >= 9)
> -			skl_detach_scalers(to_intel_crtc(crtc));
> -
>  		drm_atomic_helper_commit_planes_on_crtc(crtc_state);
>  	}
>  
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index f5f074524603..2ba3d6abbd0c 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2911,16 +2911,13 @@ unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,
>  /*
>   * This function detaches (aka. unbinds) unused scalers in hardware
>   */
> -void skl_detach_scalers(struct intel_crtc *intel_crtc)
> +static void skl_detach_scalers(struct intel_crtc *intel_crtc)
>  {
>  	struct drm_device *dev;
>  	struct drm_i915_private *dev_priv;
>  	struct intel_crtc_scaler_state *scaler_state;
>  	int i;
>  
> -	if (!intel_crtc || !intel_crtc->config)
> -		return;
> -
>  	dev = intel_crtc->base.dev;
>  	dev_priv = dev->dev_private;
>  	scaler_state = &intel_crtc->config->scaler_state;
> @@ -13505,6 +13502,9 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
>  		intel_crtc->atomic.evade =
>  			intel_pipe_update_start(intel_crtc,
>  						&intel_crtc->atomic.start_vbl_count);
> +
> +	if (!needs_modeset(crtc->state) && INTEL_INFO(dev)->gen >= 9)
> +		skl_detach_scalers(intel_crtc);

I'm not sure I follow where the !needs_modeset test comes from.  Do
these get blown away somewhere else in the modeset sequence that I'm
overlooking?  Detaching scalers here when we are doing a modeset
wouldn't cause actual problems would it?


Matt

>  }
>  
>  static void intel_finish_crtc_commit(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 0dae94631094..d96c9a24b94b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1135,7 +1135,6 @@ void intel_mode_from_pipe_config(struct drm_display_mode *mode,
>  				 struct intel_crtc_state *pipe_config);
>  void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc);
>  void intel_modeset_preclose(struct drm_device *dev, struct drm_file *file);
> -void skl_detach_scalers(struct intel_crtc *intel_crtc);
>  
>  int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state, int force_detach);
>  int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);
> -- 
> 2.1.0
> 
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-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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