On Tue, Jan 28, 2020 at 03:52:41PM -0800, José Roberto de Souza wrote:
> From: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
>
> dgfx platforms do not support CPU fence and FBC host tracking so
> lets avoid write to removed registers.
>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_fbc.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index 1f0d24a1dec1..12900b8ce28e 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -314,7 +314,12 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
> break;
> }
>
> - if (params->fence_id >= 0) {
> + if (IS_DGFX(dev_priv)) {
> + /*
> + * dGFX GPUs don't have apperture or fences and only rely on FBC
> + * render nuke to track frontbuffer modifications
> + */
> + } else if (params->fence_id >= 0) {
> dpfc_ctl |= IVB_DPFC_CTL_FENCE_EN;
> intel_de_write(dev_priv, SNB_DPFC_CTL_SA,
> SNB_CPU_FENCE_ENABLE | params->fence_id);
if (fence) {
do stuff
} else if (num_fences) {
do other stuff
}
> --
> 2.25.0
>
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--
Ville Syrjälä
Intel
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