[Intel-gfx] [PATCH v3 40/48] drm/i915/bigjoiner: Avoid dsc_compute_config for uncompressed bigjoiner

[Matt Roper]

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

For uncompressed big joiner DSC engine will not be used so will avoid
compute config of DSC.

Cc: Manasi Navare <manasi.d.navare at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at 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 92d4c5ab32d7..a1a472ffef6d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1371,9 +1371,13 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 	 */
 	ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config, &limits);
 
-	/* enable compression if the mode doesn't fit available BW */
+	/*
+	 * Pipe joiner needs compression upto display12 due to BW limitation. DG2
+	 * onwards pipe joiner can be enabled without compression.
+	 */
 	drm_dbg_kms(&i915->drm, "Force DSC en = %d\n", intel_dp->force_dsc_en);
-	if (ret || intel_dp->force_dsc_en || pipe_config->bigjoiner) {
+	if (ret || intel_dp->force_dsc_en || (DISPLAY_VER(i915) < 13 &&
+					      pipe_config->bigjoiner)) {
 		ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
 						  conn_state, &limits);
 		if (ret < 0)
-- 
2.25.4