Re: [PATCH v6] drm/i915/icl: Fix clockgating issue when using scalers

["Souza, Jose" <jose.souza@intel.com>]

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On Fri, 2019-04-05 at 14:14 -0700, Radhakrishna Sripada wrote:
> Fixes the clock-gating issue when pipe scaling is enabled.
> (Lineage #2006604312)
> 
> V2: Fix typo in headline(Chris)
>     Handle the non double buffered nature of the register(Ville)
> V3: Fix checkpatch warning. BAT failure for V2 on gen3 looks
> unrelated.
> V4: Split the icl and skl wa's(Ville)
> V5: Split the checks for icl and skl(Ville)
> V6: Correct the flipped checks in intel_pre_plane_update(Ville)
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Aditya Swarup <aditya.swarup@intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 39 ++++++++++++++++++++++++
> ----
>  1 file changed, 34 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index cf6046390eeb..ab820cad990d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -466,6 +466,7 @@ static const struct intel_limit intel_limits_bxt
> = {
>  	.p2 = { .p2_slow = 1, .p2_fast = 20 },
>  };
>  
> +/* WA Display #0827: Gen9:all */
>  static void
>  skl_wa_827(struct drm_i915_private *dev_priv, int pipe, bool enable)
>  {
> @@ -479,6 +480,18 @@ skl_wa_827(struct drm_i915_private *dev_priv,
> int pipe, bool enable)
>  			   ~(DUPS1_GATING_DIS | DUPS2_GATING_DIS));
>  }
>  
> +/* Wa_2006604312:icl */
> +static void
> +icl_wa_scalerclkgating(struct drm_i915_private *dev_priv, int pipe,
> bool enable)
> +{
> +	if (enable)
> +		I915_WRITE(CLKGATE_DIS_PSL(pipe),
> +			   I915_READ(CLKGATE_DIS_PSL(pipe)) |
> DPFR_GATING_DIS);
> +	else
> +		I915_WRITE(CLKGATE_DIS_PSL(pipe),
> +			   I915_READ(CLKGATE_DIS_PSL(pipe)) &
> ~DPFR_GATING_DIS);
> +}
> +
>  static bool
>  needs_modeset(const struct drm_crtc_state *state)
>  {
> @@ -5495,6 +5508,16 @@ static bool needs_nv12_wa(struct
> drm_i915_private *dev_priv,
>  	return false;
>  }
>  
> +static bool needs_scalerclk_wa(struct drm_i915_private *dev_priv,
> +			       const struct intel_crtc_state
> *crtc_state)
> +{
> +	/* Wa_2006604312:icl */
> +	if (crtc_state->pch_pfit.enabled && IS_ICELAKE(dev_priv))
> +		return true;

Looking to BSpec this WA is needed for other platforms too like
elkhartlake, so I would change to:

if (INTEL_GEN(dev_priv) >= 11)
	return crtc_state->pch_pfit.enabled;

> +
> +	return false;
> +}
> +
>  static void intel_post_plane_update(struct intel_crtc_state
> *old_crtc_state)
>  {
>  	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state-
> >base.crtc);
> @@ -5528,11 +5551,13 @@ static void intel_post_plane_update(struct
> intel_crtc_state *old_crtc_state)
>  			intel_post_enable_primary(&crtc->base,
> pipe_config);
>  	}
>  
> -	/* Display WA 827 */
>  	if (needs_nv12_wa(dev_priv, old_crtc_state) &&
> -	    !needs_nv12_wa(dev_priv, pipe_config)) {
> +	    !needs_nv12_wa(dev_priv, pipe_config))
>  		skl_wa_827(dev_priv, crtc->pipe, false);
> -	}
> +
> +	if (needs_scalerclk_wa(dev_priv, old_crtc_state) &&
> +	    !needs_scalerclk_wa(dev_priv, pipe_config))
> +		icl_wa_scalerclkgating(dev_priv, crtc->pipe, false);
>  }
>  
>  static void intel_pre_plane_update(struct intel_crtc_state
> *old_crtc_state,
> @@ -5569,9 +5594,13 @@ static void intel_pre_plane_update(struct
> intel_crtc_state *old_crtc_state,
>  
>  	/* Display WA 827 */
>  	if (!needs_nv12_wa(dev_priv, old_crtc_state) &&
> -	    needs_nv12_wa(dev_priv, pipe_config)) {
> +	    needs_nv12_wa(dev_priv, pipe_config))
>  		skl_wa_827(dev_priv, crtc->pipe, true);
> -	}
> +
> +	/* Wa_2006604312:icl */
> +	if (!needs_scalerclk_wa(dev_priv, old_crtc_state) &&
> +	    needs_scalerclk_wa(dev_priv, pipe_config))
> +		icl_wa_scalerclkgating(dev_priv, crtc->pipe, true);
>  
>  	/*
>  	 * Vblank time updates from the shadow to live plane control
> register

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