Re: [Intel-gfx] [PATCH 1/7] drm/i915: Fix TGL+ plane SAGV watermark programming

["Lisovskiy, Stanislav" <stanislav.lisovskiy@intel.com>]

On Fri, Feb 26, 2021 at 05:31:58PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> When we switch between SAGV on vs. off we need to reprogram all
> plane wateramrks accordingly. Currently skl_wm_add_affected_planes()
> totally ignores the SAGV watermark and just assumes we will use
> the normal WM0.
> 
> Fix this by utilizing skl_plane_wm_level() which picks the
> correct watermark based on use_sagv_wm. Thus we will force
> an update on all the planes whose watermark registers need
> to be reprogrammed.

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

> 
> Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 60 ++++++++++++++++++++-------------
>  1 file changed, 37 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 8cc67f9c4e58..2d0e3e7f11b8 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4748,11 +4748,10 @@ icl_get_total_relative_data_rate(struct intel_atomic_state *state,
>  }
>  
>  static const struct skl_wm_level *
> -skl_plane_wm_level(const struct intel_crtc_state *crtc_state,
> +skl_plane_wm_level(const struct skl_pipe_wm *pipe_wm,
>  		   enum plane_id plane_id,
>  		   int level)
>  {
> -	const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
>  	const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
>  
>  	if (level == 0 && pipe_wm->use_sagv_wm)
> @@ -5572,21 +5571,17 @@ void skl_write_plane_wm(struct intel_plane *plane,
>  	int level, max_level = ilk_wm_max_level(dev_priv);
>  	enum plane_id plane_id = plane->id;
>  	enum pipe pipe = plane->pipe;
> -	const struct skl_plane_wm *wm =
> -		&crtc_state->wm.skl.optimal.planes[plane_id];
> +	const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
> +	const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
>  	const struct skl_ddb_entry *ddb_y =
>  		&crtc_state->wm.skl.plane_ddb_y[plane_id];
>  	const struct skl_ddb_entry *ddb_uv =
>  		&crtc_state->wm.skl.plane_ddb_uv[plane_id];
>  
> -	for (level = 0; level <= max_level; level++) {
> -		const struct skl_wm_level *wm_level;
> -
> -		wm_level = skl_plane_wm_level(crtc_state, plane_id, level);
> -
> +	for (level = 0; level <= max_level; level++)
>  		skl_write_wm_level(dev_priv, PLANE_WM(pipe, plane_id, level),
> -				   wm_level);
> -	}
> +				   skl_plane_wm_level(pipe_wm, plane_id, level));
> +
>  	skl_write_wm_level(dev_priv, PLANE_WM_TRANS(pipe, plane_id),
>  			   &wm->trans_wm);
>  
> @@ -5612,19 +5607,15 @@ void skl_write_cursor_wm(struct intel_plane *plane,
>  	int level, max_level = ilk_wm_max_level(dev_priv);
>  	enum plane_id plane_id = plane->id;
>  	enum pipe pipe = plane->pipe;
> -	const struct skl_plane_wm *wm =
> -		&crtc_state->wm.skl.optimal.planes[plane_id];
> +	const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
> +	const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
>  	const struct skl_ddb_entry *ddb =
>  		&crtc_state->wm.skl.plane_ddb_y[plane_id];
>  
> -	for (level = 0; level <= max_level; level++) {
> -		const struct skl_wm_level *wm_level;
> -
> -		wm_level = skl_plane_wm_level(crtc_state, plane_id, level);
> -
> +	for (level = 0; level <= max_level; level++)
>  		skl_write_wm_level(dev_priv, CUR_WM(pipe, level),
> -				   wm_level);
> -	}
> +				   skl_plane_wm_level(pipe_wm, plane_id, level));
> +
>  	skl_write_wm_level(dev_priv, CUR_WM_TRANS(pipe), &wm->trans_wm);
>  
>  	skl_ddb_entry_write(dev_priv, CUR_BUF_CFG(pipe), ddb);
> @@ -5964,6 +5955,29 @@ skl_print_wm_changes(struct intel_atomic_state *state)
>  	}
>  }
>  
> +static bool skl_plane_selected_wm_equals(struct intel_plane *plane,
> +					 const struct skl_pipe_wm *old_pipe_wm,
> +					 const struct skl_pipe_wm *new_pipe_wm)
> +{
> +	const struct skl_plane_wm *old_wm = &old_pipe_wm->planes[plane->id];
> +	const struct skl_plane_wm *new_wm = &new_pipe_wm->planes[plane->id];
> +	struct drm_i915_private *i915 = to_i915(plane->base.dev);
> +	int level, max_level = ilk_wm_max_level(i915);
> +
> +	for (level = 0; level <= max_level; level++) {
> +		/*
> +		 * We don't check uv_wm as the hardware doesn't actually
> +		 * use it. It only gets used for calculating the required
> +		 * ddb allocation.
> +		 */
> +		if (!skl_wm_level_equals(skl_plane_wm_level(old_pipe_wm, level, plane->id),
> +					 skl_plane_wm_level(new_pipe_wm, level, plane->id)))
> +			return false;
> +	}
> +
> +	return skl_wm_level_equals(&old_wm->trans_wm, &new_wm->trans_wm);
> +}
> +
>  /*
>   * To make sure the cursor watermark registers are always consistent
>   * with our computed state the following scenario needs special
> @@ -6009,9 +6023,9 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
>  		 * with the software state.
>  		 */
>  		if (!drm_atomic_crtc_needs_modeset(&new_crtc_state->uapi) &&
> -		    skl_plane_wm_equals(dev_priv,
> -					&old_crtc_state->wm.skl.optimal.planes[plane_id],
> -					&new_crtc_state->wm.skl.optimal.planes[plane_id]))
> +		    skl_plane_selected_wm_equals(plane,
> +						 &old_crtc_state->wm.skl.optimal,
> +						 &new_crtc_state->wm.skl.optimal))
>  			continue;
>  
>  		plane_state = intel_atomic_get_plane_state(state, plane);
> -- 
> 2.26.2
> 
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