[Intel-gfx] [PATCH] drm/i915/display: Fix shared dpll mismatch for bigjoiner slave

[Manasi Navare]

Currently when we do the HW state readout, we dont set the shared dpll to NULL
for the bigjoiner slave which should not have a DPLL assigned. So it has
some garbage while the HW state readout is NULL. So explicitly reset
the shared dpll for bigjoiner slave pipe.

Bug: https://gitlab.freedesktop.org/drm/intel/-/issues/3465
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Tested-By: Swati Sharma <swati2.sharma at intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 65ddb6ca16e6..c274bfb8e549 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -9006,6 +9006,10 @@ verify_crtc_state(struct intel_crtc *crtc,
 	if (!new_crtc_state->hw.active)
 		return;
 
+	if (new_crtc_state->bigjoiner_slave)
+		/* No PLLs set for slave */
+		pipe_config->shared_dpll = NULL;
+
 	intel_pipe_config_sanity_check(dev_priv, pipe_config);
 
 	if (!intel_pipe_config_compare(new_crtc_state,
-- 
2.19.1