[PATCH 14/17] drm/i915/dp: Simplify helper to get slice count with joiner

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

When bigjoiner is used, we need at least 2 dsc slices per pipe.
Modify the condition in intel_dp_dsc_get_slice_count() to reflect the
same.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 8a32d38d21bf..afc35a83eee2 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1033,8 +1033,12 @@ u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
 		    drm_dp_dsc_sink_max_slice_count(connector->dp.dsc_dpcd, false))
 			break;
 
-		/* big joiner needs small joiner to be enabled */
-		if (num_joined_pipes == 2 && test_slice_count < 4)
+		 /*
+		  * Bigjoiner needs small joiner to be enabled.
+		  * So there should be at least 2 dsc slices per pipe,
+		  * whenever bigjoiner is enabled.
+		  */
+		if (num_joined_pipes > 1 && valid_dsc_slicecount[i] < 2)
 			continue;
 
 		if (min_slice_count <= test_slice_count)
-- 
2.45.2