[Intel-gfx] [PATCH] drm/i915/adl_p: Same slices mask is not same Dbuf state

[Stanislav Lisovskiy]

We currently treat same slice mask as a same DBuf state and skip
updating the Dbuf slices, if we detect that.
This is wrong as if we have a multi to single pipe change or
vice versa, that would be treated as a same Dbuf state and thus
no changes required, so we don't get Mbus updated, causing issues.
Solution: check also mbus_join, in addition to slices mask.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at 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 00f3dead20ad..804d83486e81 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8093,7 +8093,8 @@ void intel_dbuf_pre_plane_update(struct intel_atomic_state *state)
 		intel_atomic_get_old_dbuf_state(state);
 
 	if (!new_dbuf_state ||
-	    new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices)
+	    ((new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices)
+	    && (new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus)))
 		return;
 
 	WARN_ON(!new_dbuf_state->base.changed);
@@ -8113,7 +8114,8 @@ void intel_dbuf_post_plane_update(struct intel_atomic_state *state)
 		intel_atomic_get_old_dbuf_state(state);
 
 	if (!new_dbuf_state ||
-	    new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices)
+	    ((new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices)
+	    && (new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus)))
 		return;
 
 	WARN_ON(!new_dbuf_state->base.changed);
-- 
2.24.1.485.gad05a3d8e5