Re: [PATCH 11/20] drm/i915: Helper function to detach a scaler from a plane or crtc

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

On Wed, Apr 01, 2015 at 07:59:40PM -0700, Chandra Konduru wrote:
> This function is called from commit path of a plane or crtc.
> It programs scaler registers to detach (aka. unbinds) scaler
> from requested plane or crtc if it isn't in use. It also resets
> scaler_id in crtc/plane state.

The last sentence here is no longer true, so you should probably remove
it to avoid confusion.

Otherwise,

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> 
> v2:
> -improved a log message (me)
> 
> v3:
> -improved commentary (Matt)
> -added a case where scaler id needs to be reset (me)
> 
> v4:
> -changes made not to modify state in commit path (Matt)
> 
> Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |   29 +++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_drv.h     |    1 +
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 603a2dc..8cf0d0e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2938,6 +2938,35 @@ unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,
>  	return i915_gem_obj_ggtt_offset_view(obj, view);
>  }
>  
> +/*
> + * This function detaches (aka. unbinds) unused scalers in hardware
> + */
> +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;
> +
> +	/* loop through and disable scalers that aren't in use */
> +	for (i = 0; i < scaler_state->num_scalers; i++) {
> +		if (!scaler_state->scalers[i].in_use) {
> +			I915_WRITE(SKL_PS_CTRL(intel_crtc->pipe, i), 0);
> +			I915_WRITE(SKL_PS_WIN_POS(intel_crtc->pipe, i), 0);
> +			I915_WRITE(SKL_PS_WIN_SZ(intel_crtc->pipe, i), 0);
> +			DRM_DEBUG_KMS("CRTC:%d Disabled scaler id %u.%u\n",
> +				intel_crtc->base.base.id, intel_crtc->pipe, i);
> +		}
> +	}
> +}
> +
>  static void skylake_update_primary_plane(struct drm_crtc *crtc,
>  					 struct drm_framebuffer *fb,
>  					 int x, int y)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 1381d11..7bb4c44 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1146,6 +1146,7 @@ void intel_modeset_preclose(struct drm_device *dev, struct drm_file *file);
>  int skl_update_scaler_users(struct intel_crtc *intel_crtc,
>  	struct intel_crtc_state *crtc_state, struct intel_plane *intel_plane,
>  	struct intel_plane_state *plane_state, int force_detach);
> +void skl_detach_scalers(struct intel_crtc *intel_crtc);
>  
>  unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,
>  				     struct drm_i915_gem_object *obj);
> -- 
> 1.7.9.5
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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