[PATCH 52/53] drm/i915/dg2: Update to bigjoiner path

[Matt Roper]

From: Animesh Manna <animesh.manna at intel.com>

In verify_mpllb_state() encoder is retrieved from best_encoder
of connector_state. As there will be only one connector_state
for bigjoiner and checking encoder may not be needed for
bigjoiner-slave. This code path related to mpll is done on dg2
and need this fix to avoid null pointer dereference issue.

Cc: Manasi Navare <manasi.d.navare at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 9655f1b1b41b..3f4e811145b6 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -9153,6 +9153,9 @@ verify_mpllb_state(struct intel_atomic_state *state,
 	if (!new_crtc_state->hw.active)
 		return;
 
+	if (new_crtc_state->bigjoiner_slave)
+		return;
+
 	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
 	intel_mpllb_readout_hw_state(encoder, &mpllb_hw_state);
 
-- 
2.25.4