[Intel-gfx] [PATCH] drm/i915/display/fbc: Disable fbc by default on TGL

[Ville Syrjälä]

On Thu, Jul 16, 2020 at 02:25:40PM +0530, Uma Shankar wrote:
> Fbc is causing random underruns in CI execution on TGL platforms.
> Disabling the same while the problem is being debugged and analyzed.
> 
> Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Uma Shankar <uma.shankar at intel.com>

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

> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index 3a4f980788a6..1d6370b29b27 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -1420,6 +1420,13 @@ void intel_fbc_handle_fifo_underrun_irq(struct drm_i915_private *dev_priv)
>   */
>  static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv)
>  {
> +	/*
> +	 * Fbc is causing random underruns in CI execution on TGL platforms.
> +	 * Disabling the same while the problem is being debugged and analyzed.
> +	 */
> +	if (IS_TIGERLAKE(dev_priv))
> +		return 0;
> +
>  	if (dev_priv->params.enable_fbc >= 0)
>  		return !!dev_priv->params.enable_fbc;
>  
> -- 
> 2.22.0

-- 
Ville Syrjälä
Intel