Re: [PATCH v2 5/5] drm/i915: Enable scaling filter for plane and CRTC

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On Thu, Mar 19, 2020 at 03:51:03PM +0530, Pankaj Bharadiya wrote:
> GEN >= 10 hardware supports the programmable scaler filter.
> 
> Attach scaling filter property for CRTC and plane for GEN >= 10
> hardwares and program scaler filter based on the selected filter
> type.
> 
> changes since v1:
> * None
> Changes since RFC:
> * Enable properties for GEN >= 10 platforms (Ville)
> * Do not round off the crtc co-ordinate (Danial Stone, Ville)
> * Add new functions to handle scaling filter setup (Ville)
> * Remove coefficient set 0 hardcoding.
> 
> Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
> Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 32 ++++++++++++++++++--
>  drivers/gpu/drm/i915/display/intel_sprite.c  | 31 ++++++++++++++++++-
>  2 files changed, 60 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 791dd908aa89..4b3387ee332e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -6309,6 +6309,25 @@ void skl_scaler_setup_nearest_neighbor_filter(struct drm_i915_private *dev_priv,
>  	}
>  }
>  
> +static u32
> +skl_scaler_crtc_setup_filter(struct drm_i915_private *dev_priv, enum pipe pipe,
> +			  int id, int set, enum drm_crtc_scaling_filter filter)
> +{
> +	u32 scaler_filter_ctl = PS_FILTER_MEDIUM;
> +
> +	if (filter == DRM_CRTC_SCALING_FILTER_NEAREST_NEIGHBOR) {
> +		skl_scaler_setup_nearest_neighbor_filter(dev_priv, pipe, id,
> +							 set);
> +		scaler_filter_ctl = PS_FILTER_PROGRAMMED |
> +				PS_UV_VERT_FILTER_SELECT(set) |
> +				PS_UV_HORZ_FILTER_SELECT(set) |
> +				PS_Y_VERT_FILTER_SELECT(set) |
> +				PS_Y_HORZ_FILTER_SELECT(set);
> +
> +	}
> +	return scaler_filter_ctl;

This function does too many things.

> +}
> +
>  static void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
>  {
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> @@ -6316,12 +6335,14 @@ static void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
>  	enum pipe pipe = crtc->pipe;
>  	const struct intel_crtc_scaler_state *scaler_state =
>  		&crtc_state->scaler_state;
> +	const struct drm_crtc_state *state = &crtc_state->uapi;

Pls don't add this kind of aliases. We're moving away from using the
drm_ types as much as possible.

>  
>  	if (crtc_state->pch_pfit.enabled) {
>  		u16 uv_rgb_hphase, uv_rgb_vphase;
>  		int pfit_w, pfit_h, hscale, vscale;
>  		unsigned long irqflags;
>  		int id;
> +		int scaler_filter_ctl;

It's a register value so u32. I'd also 
s/scaler_filter_ctl/filter_select/ or something like that.

Alternatively we could just call it ps_ctrl and have it contain
the full register value for that particular register.

>  
>  		if (drm_WARN_ON(&dev_priv->drm,
>  				crtc_state->scaler_state.scaler_id < 0))
> @@ -6340,8 +6361,12 @@ static void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
>  
>  		spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>  
> -		intel_de_write_fw(dev_priv, SKL_PS_CTRL(pipe, id), PS_SCALER_EN |
> -				  PS_FILTER_MEDIUM | scaler_state->scalers[id].mode);
> +		scaler_filter_ctl =
> +			skl_scaler_crtc_setup_filter(dev_priv, pipe, id, 0,
> +						state->scaling_filter);
> +		intel_de_write_fw(dev_priv, SKL_PS_CTRL(pipe, id),
> +				  PS_SCALER_EN | scaler_filter_ctl |
> +				  scaler_state->scalers[id].mode);
>  		intel_de_write_fw(dev_priv, SKL_PS_VPHASE(pipe, id),
>  				  PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_vphase));
>  		intel_de_write_fw(dev_priv, SKL_PS_HPHASE(pipe, id),
> @@ -16777,6 +16802,9 @@ static int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe)
>  		dev_priv->plane_to_crtc_mapping[i9xx_plane] = crtc;
>  	}
>  
> +	if (INTEL_GEN(dev_priv) >= 10)
> +		drm_crtc_enable_scaling_filter(&crtc->base);
> +
>  	intel_color_init(crtc);
>  
>  	intel_crtc_crc_init(crtc);
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index deda351719db..ac3fd9843ace 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -395,6 +395,26 @@ skl_plane_max_stride(struct intel_plane *plane,
>  		return min(8192 * cpp, 32768);
>  }
>  
> +static u32
> +skl_scaler_plane_setup_filter(struct drm_i915_private *dev_priv, enum pipe pipe,
> +			      int id, int set,
> +			      enum drm_plane_scaling_filter filter)
> +{
> +	u32 scaler_filter_ctl = PS_FILTER_MEDIUM;
> +
> +	if (filter == DRM_PLANE_SCALING_FILTER_NEAREST_NEIGHBOR) {
> +		skl_scaler_setup_nearest_neighbor_filter(dev_priv, pipe, id,
> +							 set);
> +		scaler_filter_ctl = PS_FILTER_PROGRAMMED |
> +				PS_UV_VERT_FILTER_SELECT(set) |
> +				PS_UV_HORZ_FILTER_SELECT(set) |
> +				PS_Y_VERT_FILTER_SELECT(set) |
> +				PS_Y_HORZ_FILTER_SELECT(set);
> +
> +	}
> +	return scaler_filter_ctl;
> +}
> +

We don't want such copy pasta between planes and crtcs.

>  static void
>  skl_program_scaler(struct intel_plane *plane,
>  		   const struct intel_crtc_state *crtc_state,
> @@ -406,6 +426,7 @@ skl_program_scaler(struct intel_plane *plane,
>  	int scaler_id = plane_state->scaler_id;
>  	const struct intel_scaler *scaler =
>  		&crtc_state->scaler_state.scalers[scaler_id];
> +	const struct drm_plane_state *state = &plane_state->uapi;
>  	int crtc_x = plane_state->uapi.dst.x1;
>  	int crtc_y = plane_state->uapi.dst.y1;
>  	u32 crtc_w = drm_rect_width(&plane_state->uapi.dst);
> @@ -413,6 +434,7 @@ skl_program_scaler(struct intel_plane *plane,
>  	u16 y_hphase, uv_rgb_hphase;
>  	u16 y_vphase, uv_rgb_vphase;
>  	int hscale, vscale;
> +	int scaler_filter_ctl;
>  
>  	hscale = drm_rect_calc_hscale(&plane_state->uapi.src,
>  				      &plane_state->uapi.dst,
> @@ -439,8 +461,12 @@ skl_program_scaler(struct intel_plane *plane,
>  		uv_rgb_vphase = skl_scaler_calc_phase(1, vscale, false);
>  	}
>  
> +	scaler_filter_ctl =
> +		skl_scaler_plane_setup_filter(dev_priv, pipe, scaler_id, 0,
> +					      state->scaling_filter);
>  	intel_de_write_fw(dev_priv, SKL_PS_CTRL(pipe, scaler_id),
> -			  PS_SCALER_EN | PS_PLANE_SEL(plane->id) | scaler->mode);
> +			  PS_SCALER_EN | PS_PLANE_SEL(plane->id) |
> +			  scaler->mode | scaler_filter_ctl);
>  	intel_de_write_fw(dev_priv, SKL_PS_VPHASE(pipe, scaler_id),
>  			  PS_Y_PHASE(y_vphase) | PS_UV_RGB_PHASE(uv_rgb_vphase));
>  	intel_de_write_fw(dev_priv, SKL_PS_HPHASE(pipe, scaler_id),
> @@ -3121,6 +3147,9 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
>  
>  	drm_plane_create_zpos_immutable_property(&plane->base, plane_id);
>  
> +	if (INTEL_GEN(dev_priv) >= 10)
> +		drm_plane_enable_scaling_filter(&plane->base);
> +
>  	drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);
>  
>  	return plane;
> -- 
> 2.23.0

-- 
Ville Syrjälä
Intel
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