[igt-dev] [PATCH] tests/kms_setmode: Fix the corner case in handling 5k+ modes

[Bhanuprakash Modem]

In below example, second combination (Pipe-B & Pipe-A) is invalid
as bigjoiner come in to the picture. Somehow we missed this corner
case in earlier fix, hence fixing now.

Starting dynamic subtest: pipe-A-DP-1-pipe-B-DP-4
  Test id#1 CRTC count 2
    CRTC[115] [Pipe A] Mode: 3840x2160 at 30Hz Connectors: DP-1[384]
    CRTC[203] [Pipe B] Mode: 7680x4320 at 30Hz Connectors: DP-4[416]
Dynamic subtest pipe-A-DP-1-pipe-B-DP-4: SUCCESS (0.509s)
Starting dynamic subtest: pipe-B-DP-1-pipe-A-DP-4
  Test id#2 CRTC count 2
    CRTC[203] [Pipe B] Mode: 3840x2160 at 30Hz Connectors: DP-1[384]
    CRTC[115] [Pipe A] Mode: 7680x4320 at 30Hz Connectors: DP-4[416]
Dynamic subtest pipe-B-DP-1-pipe-A-DP-4: FAIL (0.272s)

V2:
* Improve the logic
* Add comments

Cc: Karthik B S <karthik.b.s at intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_setmode.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tests/kms_setmode.c b/tests/kms_setmode.c
index 969ad75c..8c755091 100644
--- a/tests/kms_setmode.c
+++ b/tests/kms_setmode.c
@@ -676,10 +676,16 @@ static void test_one_combination(const struct test_config *tconf,
 			 * if mode.hdisplay > 5120, then ignore
 			 *   - last crtc in single/multi-connector config
 			 *   - consecutive crtcs in multi-connector config
+			 *
+			 * in multi-connector config ignore if
+			 *   - previous crtc mode.hdisplay > 5120 and
+			 *   - current & previous crtcs are consecutive
 			 */
-			if ((crtc->mode.hdisplay > MAX_HDISPLAY_PER_CRTC) &&
-			    ((crtc->crtc_idx >= (tconf->resources->count_crtcs - 1)) ||
-			     (i < (crtc_count - 1) && abs(crtcs[i + 1].crtc_idx - crtc->crtc_idx) <= 1))) {
+			if (((crtc->mode.hdisplay > MAX_HDISPLAY_PER_CRTC) &&
+			     ((crtc->crtc_idx >= (tconf->resources->count_crtcs - 1)) ||
+			      ((i < (crtc_count - 1)) && (abs(crtcs[i + 1].crtc_idx - crtc->crtc_idx) <= 1)))) ||
+			    ((i > 0) && (crtc[i - 1].mode.hdisplay > MAX_HDISPLAY_PER_CRTC) &&
+			     (abs(crtc->crtc_idx - crtcs[i - 1].crtc_idx) <= 1))) {
 				igt_info("Combo: %s is not possible with selected mode(s).\n", test_name);
 				goto out;
 			}
-- 
2.35.1