[Intel-gfx] [PATCH 03/14] drm/i915: Get rid of the "sizes are 0 based" stuff

[Souza, Jose]

On Wed, 2021-12-01 at 17:25 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Replace the "sizes are 0 based" stuff with just straight
> up -1 where needed. Less confusing all around.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_sprite.c   | 26 ++++---------------
>  .../drm/i915/display/skl_universal_plane.c    |  6 +----
>  2 files changed, 6 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 1b99a9501a45..2067a7bca4a8 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -431,10 +431,6 @@ vlv_sprite_update_noarm(struct intel_plane *plane,
>  	u32 crtc_h = drm_rect_height(&plane_state->uapi.dst);
>  	unsigned long irqflags;
>  
> -	/* Sizes are 0 based */

In my opinion at least this comment should stay, helps understand why the -1. 

> -	crtc_w--;
> -	crtc_h--;
> -
>  	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>  
>  	intel_de_write_fw(dev_priv, SPSTRIDE(pipe, plane_id),
> @@ -442,7 +438,7 @@ vlv_sprite_update_noarm(struct intel_plane *plane,
>  	intel_de_write_fw(dev_priv, SPPOS(pipe, plane_id),
>  			  (crtc_y << 16) | crtc_x);
>  	intel_de_write_fw(dev_priv, SPSIZE(pipe, plane_id),
> -			  (crtc_h << 16) | crtc_w);
> +			  ((crtc_h - 1) << 16) | (crtc_w - 1));
>  
>  	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
>  }
> @@ -866,21 +862,15 @@ ivb_sprite_update_noarm(struct intel_plane *plane,
>  	u32 sprscale = 0;
>  	unsigned long irqflags;
>  
> -	/* Sizes are 0 based */
> -	src_w--;
> -	src_h--;
> -	crtc_w--;
> -	crtc_h--;
> -
>  	if (crtc_w != src_w || crtc_h != src_h)
> -		sprscale = SPRITE_SCALE_ENABLE | (src_w << 16) | src_h;
> +		sprscale = SPRITE_SCALE_ENABLE | ((src_w - 1) << 16) | (src_h - 1);
>  
>  	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>  
>  	intel_de_write_fw(dev_priv, SPRSTRIDE(pipe),
>  			  plane_state->view.color_plane[0].mapping_stride);
>  	intel_de_write_fw(dev_priv, SPRPOS(pipe), (crtc_y << 16) | crtc_x);
> -	intel_de_write_fw(dev_priv, SPRSIZE(pipe), (crtc_h << 16) | crtc_w);
> +	intel_de_write_fw(dev_priv, SPRSIZE(pipe), ((crtc_h - 1) << 16) | (crtc_w - 1));
>  	if (IS_IVYBRIDGE(dev_priv))
>  		intel_de_write_fw(dev_priv, SPRSCALE(pipe), sprscale);
>  
> @@ -1208,21 +1198,15 @@ g4x_sprite_update_noarm(struct intel_plane *plane,
>  	u32 dvsscale = 0;
>  	unsigned long irqflags;
>  
> -	/* Sizes are 0 based */
> -	src_w--;
> -	src_h--;
> -	crtc_w--;
> -	crtc_h--;
> -
>  	if (crtc_w != src_w || crtc_h != src_h)
> -		dvsscale = DVS_SCALE_ENABLE | (src_w << 16) | src_h;
> +		dvsscale = DVS_SCALE_ENABLE | ((src_w - 1) << 16) | (src_h - 1);
>  
>  	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>  
>  	intel_de_write_fw(dev_priv, DVSSTRIDE(pipe),
>  			  plane_state->view.color_plane[0].mapping_stride);
>  	intel_de_write_fw(dev_priv, DVSPOS(pipe), (crtc_y << 16) | crtc_x);
> -	intel_de_write_fw(dev_priv, DVSSIZE(pipe), (crtc_h << 16) | crtc_w);
> +	intel_de_write_fw(dev_priv, DVSSIZE(pipe), ((crtc_h - 1) << 16) | (crtc_w - 1));
>  	intel_de_write_fw(dev_priv, DVSSCALE(pipe), dvsscale);
>  
>  	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> index 9ff24a0e79b4..09948922016b 100644
> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> @@ -1022,10 +1022,6 @@ skl_program_plane_noarm(struct intel_plane *plane,
>  	u32 src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
>  	unsigned long irqflags;
>  
> -	/* Sizes are 0 based */
> -	src_w--;
> -	src_h--;
> -
>  	/* The scaler will handle the output position */
>  	if (plane_state->scaler_id >= 0) {
>  		crtc_x = 0;
> @@ -1045,7 +1041,7 @@ skl_program_plane_noarm(struct intel_plane *plane,
>  	intel_de_write_fw(dev_priv, PLANE_POS(pipe, plane_id),
>  			  (crtc_y << 16) | crtc_x);
>  	intel_de_write_fw(dev_priv, PLANE_SIZE(pipe, plane_id),
> -			  (src_h << 16) | src_w);
> +			  ((src_h - 1) << 16) | (src_w - 1));
>  
>  	if (intel_fb_is_rc_ccs_cc_modifier(fb->modifier)) {
>  		intel_de_write_fw(dev_priv, PLANE_CC_VAL(pipe, plane_id, 0),