IPC (Isoch Priority Control) may cause underflows. KBL WA: When IPC is enabled, watermark latency values must be increased by 4us across all levels. This brings level 0 up to 6us. Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx> --- drivers/gpu/drm/i915/intel_pm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 7090a7c..df39b50 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3599,6 +3599,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv, return 0; } + /* IPC WA for kabylake */ + if (IS_KABYLAKE(dev_priv) && dev_priv->ipc_enabled) + latency += 4; + y_tiled = fb->modifier == I915_FORMAT_MOD_Y_TILED || fb->modifier == I915_FORMAT_MOD_Yf_TILED; x_tiled = fb->modifier == I915_FORMAT_MOD_X_TILED; -- 2.10.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
