drm/i915: Fix wm latency==0 disable on skl+

When adding the early latency==0 check back I neglected to
realize that we no longer have a way to return a failure
from the wm computation like we had in the past (since we
now calculate wms before ddb allocations). Also plane_en
being false doesn't actually indicate that the level is
invalid as it wil also happen when the plane is not
enabled.

skl_allocate_pipe_ddb() starts scanning from the maximum
watermark level and it stops as soon as it finds a level
that is deemed viable. The assumption being that if level
n+1 is valid then level n is valid as well. Thus if we
now disable any watermark level by zeroing its latency
the code will think that level to be actually valid
and won't confirm whether the actually enabled lower
watermark level(s) actually fit into the allotted ddb
space. This results in hilarious watermark values that
exceed the ddb allocation of the plane.

The way we must now indicate a failure is to assign an
unreasoanbly big value to min_ddb_alloc which will then
make skl_allocate_pipe_ddb() reject the entire level.

v2: Also do the same for the lines>31 case (Matt)
v3: Make 'blocks' u32 (Matt)

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190205155053.10081-1-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_pm.c

@@ -4319,7 +4319,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	int num_active;
 	u64 plane_data_rate[I915_MAX_PLANES] = {};
 	u64 uv_plane_data_rate[I915_MAX_PLANES] = {};
-	u16 blocks = 0;
+	u32 blocks;
 	int level;
 
 	/* Clear the partitioning for disabled planes. */
@@ -4694,8 +4694,11 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *cstate,
 	uint_fixed_16_16_t selected_result;
 	u32 res_blocks, res_lines, min_ddb_alloc = 0;
 
-	if (latency == 0)
+	if (latency == 0) {
+		/* reject it */
+		result->min_ddb_alloc = U16_MAX;
 		return;
+	}
 
 	/* Display WA #1141: kbl,cfl */
 	if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv) ||
@@ -4783,8 +4786,11 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *cstate,
 	if (!skl_wm_has_lines(dev_priv, level))
 		res_lines = 0;
 
-	if (res_lines > 31)
+	if (res_lines > 31) {
+		/* reject it */
+		result->min_ddb_alloc = U16_MAX;
 		return;
+	}
 
 	/*
 	 * If res_lines is valid, assume we can use this watermark level