drm/i915: Don't merge LP1+ watermarks on ILK/SNB/IVB when multiple pipes are enabled

Multi-pipe LP1+ watermarks are a HSW+ feature, so let's not do it on
earlier generations.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c43cf138c871..a65d8816c1e6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2690,11 +2690,17 @@ static void ilk_merge_wm_level(struct drm_device *dev,
  * Merge all low power watermarks for all active pipes.
  */
 static void ilk_wm_merge(struct drm_device *dev,
+                         const struct intel_wm_config *config,
                          const struct hsw_wm_maximums *max,
                          struct intel_pipe_wm *merged)
 {
         int level, max_level = ilk_wm_max_level(dev);
 
+        /* ILK/SNB/IVB: LP1+ watermarks only w/ single pipe */
+        if ((INTEL_INFO(dev)->gen <= 6 || IS_IVYBRIDGE(dev)) &&
+            config->num_pipes_active > 1)
+                return;
+
         merged->fbc_wm_enabled = true;
 
         /* merge each WM1+ level */
@@ -3000,13 +3006,13 @@ static void haswell_update_wm(struct drm_crtc *crtc)
         intel_crtc->wm.active = pipe_wm;
 
         ilk_compute_wm_maximums(dev, 1, &config, INTEL_DDB_PART_1_2, &max);
-        ilk_wm_merge(dev, &max, &lp_wm_1_2);
+        ilk_wm_merge(dev, &config, &max, &lp_wm_1_2);
 
         /* 5/6 split only in single pipe config on IVB+ */
         if (INTEL_INFO(dev)->gen >= 7 &&
             config.num_pipes_active == 1 && config.sprites_enabled) {
                 ilk_compute_wm_maximums(dev, 1, &config, INTEL_DDB_PART_5_6, &max);
-                ilk_wm_merge(dev, &max, &lp_wm_5_6);
+                ilk_wm_merge(dev, &config, &max, &lp_wm_5_6);
 
                 best_lp_wm = hsw_find_best_result(dev, &lp_wm_1_2, &lp_wm_5_6);
         } else {