[Intel-gfx] [PATCH 11/14] drm/i915: Fix latency==0 handling for level 0 watermark on skl+

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

If the level 0 latency is 0 we can't do anything. Return an error
rather than success.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 6fa1634e2db5..bd5f16bc7e08 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4703,8 +4703,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	bool apply_memory_bw_wa = skl_needs_memory_bw_wa(state);
 	uint32_t min_disp_buf_needed;
 
-	if (latency == 0 ||
-	    !intel_wm_plane_visible(cstate, intel_pstate)) {
+	if (latency == 0)
+		return level == 0 ? -EINVAL : 0;
+
+	if (!intel_wm_plane_visible(cstate, intel_pstate)) {
 		result->plane_en = false;
 		return 0;
 	}
-- 
2.18.1