[Intel-gfx] [PATCH 1/6] drm/i915: Check crtc_state->wm.need_postvbl_update before grabbing wm.mutex

[Imre Deak]

On Mon, Jul 01, 2019 at 07:05:45PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> wm.mutex does not protect the crtc state so no point in grabbing it
> to check crtc_state->wm.need_postvbl_update.
> 
> Also do a bit of s/intel_crtc/crtc/ while at it.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Looks ok, on patches 1-6:
Reviewed-by: Imre Deak <imre.deak at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d10c62d3f10c..807a078690d5 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -1566,13 +1566,13 @@ static void g4x_optimize_watermarks(struct intel_atomic_state *state,
>  				    struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>  
>  	if (!crtc_state->wm.need_postvbl_update)
>  		return;
>  
>  	mutex_lock(&dev_priv->wm.wm_mutex);
> -	intel_crtc->wm.active.g4x = crtc_state->wm.g4x.optimal;
> +	crtc->wm.active.g4x = crtc_state->wm.g4x.optimal;
>  	g4x_program_watermarks(dev_priv);
>  	mutex_unlock(&dev_priv->wm.wm_mutex);
>  }
> @@ -2185,13 +2185,13 @@ static void vlv_optimize_watermarks(struct intel_atomic_state *state,
>  				    struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>  
>  	if (!crtc_state->wm.need_postvbl_update)
>  		return;
>  
>  	mutex_lock(&dev_priv->wm.wm_mutex);
> -	intel_crtc->wm.active.vlv = crtc_state->wm.vlv.optimal;
> +	crtc->wm.active.vlv = crtc_state->wm.vlv.optimal;
>  	vlv_program_watermarks(dev_priv);
>  	mutex_unlock(&dev_priv->wm.wm_mutex);
>  }
> @@ -5723,10 +5723,10 @@ static void ilk_initial_watermarks(struct intel_atomic_state *state,
>  				   struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>  
>  	mutex_lock(&dev_priv->wm.wm_mutex);
> -	intel_crtc->wm.active.ilk = crtc_state->wm.ilk.intermediate;
> +	crtc->wm.active.ilk = crtc_state->wm.ilk.intermediate;
>  	ilk_program_watermarks(dev_priv);
>  	mutex_unlock(&dev_priv->wm.wm_mutex);
>  }
> @@ -5735,13 +5735,14 @@ static void ilk_optimize_watermarks(struct intel_atomic_state *state,
>  				    struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> +
> +	if (!crtc_state->wm.need_postvbl_update)
> +		return;
>  
>  	mutex_lock(&dev_priv->wm.wm_mutex);
> -	if (crtc_state->wm.need_postvbl_update) {
> -		intel_crtc->wm.active.ilk = crtc_state->wm.ilk.optimal;
> -		ilk_program_watermarks(dev_priv);
> -	}
> +	crtc->wm.active.ilk = crtc_state->wm.ilk.optimal;
> +	ilk_program_watermarks(dev_priv);
>  	mutex_unlock(&dev_priv->wm.wm_mutex);
>  }
>  
> -- 
> 2.21.0
> 
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