[Intel-gfx] [PATCH] drm/i915: Disable FBC if BIOS reserved memory (stolen) is unavailable

[Ville Syrjälä]

On Wed, Sep 11, 2019 at 06:59:26PM +0100, Chris Wilson wrote:
> The FBC requires a couple of contiguous buffers, which we allocate from
> stolen memory. If stolen memory is unavailable, we cannot allocate those
> buffers and so cannot support FBC. Mark it so.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index dc34b23e2320..3111ecaeabd0 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -1320,6 +1320,9 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
>  	fbc->enabled = false;
>  	fbc->active = false;
>  
> +	if (!drm_mm_initialized(&dev_priv->mm.stolen))
> +		mkwrite_device_info(dev_priv)->display.has_fbc = false;
> +

Not a huge fan of this approach since it means we won't even make sure
FBC is truly disabled. But we already do this for other reasons so I
guess it's fine.

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

>  	if (need_fbc_vtd_wa(dev_priv))
>  		mkwrite_device_info(dev_priv)->display.has_fbc = false;
>  
> -- 
> 2.23.0
> 
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-- 
Ville Syrjälä
Intel