[Intel-gfx] [PATCH 4/4] drm/i915: Don't allocate extra ddb during async flip for DG2

[Stanislav Lisovskiy]

In terms of async flip optimization we don't to allocate
extra ddb space, so lets skip it.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovs...@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0b45d1d61d0f..e1594f43bb1b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5245,9 +5245,15 @@ skl_allocate_plane_ddb(struct intel_atomic_state *state,
                        break;
 
                rate = crtc_state->plane_data_rate[plane_id];
-               extra = min_t(u16, alloc_size,
-                             DIV64_U64_ROUND_UP(alloc_size * rate,
-                                                total_data_rate));
+
+               if (IS_DG2(dev_priv) && crtc_state->uapi.async_flip) {
+                       extra = 0;
+               } else {
+                       extra = min_t(u16, alloc_size,
+                                     DIV64_U64_ROUND_UP(alloc_size * rate,
+                                                        total_data_rate));
+               }
+
                total[plane_id] = wm->wm[level].min_ddb_alloc + extra;
                alloc_size -= extra;
                total_data_rate -= rate;
@@ -5256,9 +5262,15 @@ skl_allocate_plane_ddb(struct intel_atomic_state *state,
                        break;
 
                rate = crtc_state->uv_plane_data_rate[plane_id];
-               extra = min_t(u16, alloc_size,
-                             DIV64_U64_ROUND_UP(alloc_size * rate,
-                                                total_data_rate));
+
+               if (IS_DG2(dev_priv) && crtc_state->uapi.async_flip) {
+                       extra = 0;
+               } else {
+                       extra = min_t(u16, alloc_size,
+                                     DIV64_U64_ROUND_UP(alloc_size * rate,
+                                                        total_data_rate));
+               }
+
                uv_total[plane_id] = wm->uv_wm[level].min_ddb_alloc + extra;
                alloc_size -= extra;
                total_data_rate -= rate;
-- 
2.24.1.485.gad05a3d8e5