[Intel-gfx] [PATCH v2 2/3] drm/i915/display: Do not write in removed FBC fence registers

[Ville Syrjälä]

On Wed, Feb 05, 2020 at 06:08:50PM -0800, José Roberto de Souza wrote:
> From: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> 
> Platforms without fences don't have FBC host tracking and those
> registers are marked as reserved in those platforms.
> 
> v2: checking num_fences to write to FBC fence registers (Ville)
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index 3a9e41e93ebf..fa8fca1a6b7c 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -320,7 +320,7 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
>  			       SNB_CPU_FENCE_ENABLE | params->fence_id);
>  		intel_de_write(dev_priv, DPFC_CPU_FENCE_OFFSET,
>  			       params->crtc.fence_y_offset);
> -	} else {
> +	} else if (dev_priv->ggtt.num_fences) {
>  		intel_de_write(dev_priv, SNB_DPFC_CTL_SA, 0);
>  		intel_de_write(dev_priv, DPFC_CPU_FENCE_OFFSET, 0);
>  	}
> -- 
> 2.25.0

-- 
Ville Syrjälä
Intel