[PATCH v3 02/12] drm/i915/dp_mst: Simplify handling the single-bpp case during state computation

[Imre Deak]

A follow-up change wants to skip invalid bpps in the bpp select loop of
a stream state computation. To allow for that, using the usual
'continue' statement in the loop, change the way the single-bpp range is
handled.

v2: Fix typo in commit message. (Ankit)

Cc: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Luca Coelho <luciano.coelho at intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 06f4ad8de591e..fa969b46245cd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -263,6 +263,12 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
 					   fxp_q4_to_frac(max_bpp_x16) ||
 					   fxp_q4_to_frac(bpp_step_x16)));
 
+	if (!bpp_step_x16) {
+		/* Allow using zero step only to indicate single try for a given bpp. */
+		drm_WARN_ON(display->drm, min_bpp_x16 != max_bpp_x16);
+		bpp_step_x16 = 1;
+	}
+
 	if (is_mst) {
 		mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst.mgr);
 		if (IS_ERR(mst_state))
@@ -386,10 +392,6 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
 
 			break;
 		}
-
-		/* Allow using zero step to indicate one try */
-		if (!bpp_step_x16)
-			break;
 	}
 
 	if (slots < 0) {
-- 
2.44.2