drm/i915: Fix dbuf slice mask when turning off all the pipes

The current dbuf slice computation only happens when there are
active pipes. If we are turning off all the pipes we just leave
the dbuf slice mask at it's previous value, which may be something
other that BIT(S1). If runtime PM will kick in it will however
turn off everything but S1. Then on the next atomic commit (if
the new dbuf slice mask matches the stale value we left behind)
the code will not turn on the other slices we now need. This will
lead to underruns as the planes are trying to use a dbuf slice
that's not powered up.

To work around let's just just explicitly set the dbuf slice mask
to BIT(S1) when we are turning off all the pipes. Really the code
should just calculate this stuff the same way regardless whether
the pipes are on or off, but we're not quite there yet (need a
bit more work on the dbuf state for that).

v2: Let's not put the fix into dead code

Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Fixes: 3cf43cdc ("drm/i915: Introduce proper dbuf state")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200518121354.20401-1-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_pm.c

@@ -4764,6 +4764,30 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state)
 	memset(crtc_state->wm.skl.plane_ddb_uv, 0, sizeof(crtc_state->wm.skl.plane_ddb_uv));
 
 	if (!crtc_state->hw.active) {
+		struct intel_atomic_state *state =
+			to_intel_atomic_state(crtc_state->uapi.state);
+		struct intel_dbuf_state *new_dbuf_state =
+			intel_atomic_get_new_dbuf_state(state);
+		const struct intel_dbuf_state *old_dbuf_state =
+			intel_atomic_get_old_dbuf_state(state);
+
+		/*
+		 * FIXME hack to make sure we compute this sensibly when
+		 * turning off all the pipes. Otherwise we leave it at
+		 * whatever we had previously, and then runtime PM will
+		 * mess it up by turning off all but S1. Remove this
+		 * once the dbuf state computation flow becomes sane.
+		 */
+		if (new_dbuf_state->active_pipes == 0) {
+			new_dbuf_state->enabled_slices = BIT(DBUF_S1);
+
+			if (old_dbuf_state->enabled_slices != new_dbuf_state->enabled_slices) {
+				ret = intel_atomic_serialize_global_state(&new_dbuf_state->base);
+				if (ret)
+					return ret;
+			}
+		}
+
 		alloc->start = alloc->end = 0;
 		return 0;
 	}