[Intel-gfx] [PATCH 7/7] drm/i915/skl: Take 90/270 rotation into account in watermark calculations

[Joonas Lahtinen]

On ti, 2015-03-17 at 15:45 +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> v2: Pass in rotation info to sprite plane updates as well.
> 
> v3: Use helper to determine 90/270 rotation. (Michel Thierry)
> 
> v4: Rebased for fb modifiers and atomic changes.
> 
> For: VIZ-4546
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Reviewed-by: Michel Thierry <michel.thierry at intel.com> (v3)

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com> (v4)

> ---
>  drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++++++++++----
>  drivers/gpu/drm/i915/intel_drv.h     |  4 ++++
>  drivers/gpu/drm/i915/intel_pm.c      | 18 +++++++++++++++++-
>  drivers/gpu/drm/i915/intel_sprite.c  |  5 +----
>  4 files changed, 45 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 9af73b1..19bec33 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11994,6 +11994,28 @@ static void intel_shared_dpll_init(struct drm_device *dev)
>  }
>  
>  /**
> + * intel_wm_need_update - Check whether watermarks need updating
> + * @plane: drm plane
> + * @state: new plane state
> + *
> + * Check current plane state versus the new one to determine whether
> + * watermarks need to be recalculated.
> + *
> + * Returns true or false.
> + */
> +bool intel_wm_need_update(struct drm_plane *plane,
> +			  struct drm_plane_state *state)
> +{
> +	/* Update watermarks on tiling changes. */
> +	if (!plane->state->fb || !state->fb ||
> +	    plane->state->fb->modifier[0] != state->fb->modifier[0] ||
> +	    plane->state->rotation != state->rotation)
> +		return true;
> +
> +	return false;
> +}
> +
> +/**
>   * intel_prepare_plane_fb - Prepare fb for usage on plane
>   * @plane: drm plane to prepare for
>   * @fb: framebuffer to prepare for presentation
> @@ -12139,10 +12161,7 @@ intel_check_primary_plane(struct drm_plane *plane,
>  
>  		intel_crtc->atomic.update_fbc = true;
>  
> -		/* Update watermarks on tiling changes. */
> -		if (!plane->state->fb || !state->base.fb ||
> -		    plane->state->fb->modifier[0] !=
> -		    state->base.fb->modifier[0])
> +		if (intel_wm_need_update(plane, &state->base))
>  			intel_crtc->atomic.update_wm = true;
>  	}
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index ae28fb4..a7ecf95 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -501,6 +501,7 @@ struct intel_plane_wm_parameters {
>  	bool enabled;
>  	bool scaled;
>  	u64 tiling;
> +	unsigned int rotation;
>  };
>  
>  struct intel_plane {
> @@ -997,6 +998,9 @@ intel_rotation_90_or_270(unsigned int rotation)
>  	return rotation & (BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270));
>  }
>  
> +bool intel_wm_need_update(struct drm_plane *plane,
> +			  struct drm_plane_state *state);
> +
>  /* shared dpll functions */
>  struct intel_shared_dpll *intel_crtc_to_shared_dpll(struct intel_crtc *crtc);
>  void assert_shared_dpll(struct drm_i915_private *dev_priv,
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 288c9d2..4e080a6 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2840,6 +2840,7 @@ static void skl_compute_wm_pipe_parameters(struct drm_crtc *crtc,
>  		}
>  		p->plane[0].horiz_pixels = intel_crtc->config->pipe_src_w;
>  		p->plane[0].vert_pixels = intel_crtc->config->pipe_src_h;
> +		p->plane[0].rotation = crtc->primary->state->rotation;
>  
>  		fb = crtc->cursor->state->fb;
>  		if (fb) {
> @@ -2897,7 +2898,21 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
>  
>  	if (p_params->tiling == I915_FORMAT_MOD_Y_TILED ||
>  	    p_params->tiling == I915_FORMAT_MOD_Yf_TILED) {
> -		uint32_t y_tile_minimum = plane_blocks_per_line * 4;
> +		uint32_t min_scanlines = 4;
> +		uint32_t y_tile_minimum;
> +		if (intel_rotation_90_or_270(p_params->rotation)) {
> +			switch (p_params->bytes_per_pixel) {
> +			case 1:
> +				min_scanlines = 16;
> +				break;
> +			case 2:
> +				min_scanlines = 8;
> +				break;
> +			case 8:
> +				WARN(1, "Unsupported pixel depth for rotation");
> +			};
> +		}
> +		y_tile_minimum = plane_blocks_per_line * min_scanlines;
>  		selected_result = max(method2, y_tile_minimum);
>  	} else {
>  		if ((ddb_allocation / plane_blocks_per_line) >= 1)
> @@ -3357,6 +3372,7 @@ skl_update_sprite_wm(struct drm_plane *plane, struct drm_crtc *crtc,
>  	 */
>  	if (fb)
>  		intel_plane->wm.tiling = fb->modifier[0];
> +	intel_plane->wm.rotation = plane->state->rotation;
>  
>  	skl_update_wm(crtc);
>  }
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index d960572..b919b0a 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -1260,10 +1260,7 @@ finish:
>  		if (!intel_crtc->primary_enabled && !state->hides_primary)
>  			intel_crtc->atomic.post_enable_primary = true;
>  
> -		/* Update watermarks on tiling changes. */
> -		if (!plane->state->fb || !state->base.fb ||
> -		    plane->state->fb->modifier[0] !=
> -		    state->base.fb->modifier[0])
> +		if (intel_wm_need_update(plane, &state->base))
>  			intel_crtc->atomic.update_wm = true;
>  	}
>