[PATCH i-g-t v3 1/5] tests/kms_flip: Default to tiled modifiers for stable flips on high refresh panels

[Naladala Ramanaidu]

Using tiled modifiers as the default significantly improves flip
test pass rates, especially on high refresh rate panels.

Consolidated report on 10 samples on each pipe as below.
    - PipeA:  95.01% -> 100.00% (Improved by 4.99%)
    - PipeB:  91.57% -> 100.00% (Improved by 8.43%)
    - PipeC:  73.17% -> 97.94% (Improved by 24.77%)
    - PipeD:  76.64% -> 98.89% (Improved by 22.25%)

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala at intel.com>
---
 tests/kms_flip.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tests/kms_flip.c b/tests/kms_flip.c
index 65016c66d..ca31ef7dd 100755
--- a/tests/kms_flip.c
+++ b/tests/kms_flip.c
@@ -282,6 +282,8 @@ static drmModeConnector *last_connector;
 
 uint32_t *fb_ptr;
 
+static igt_display_t display;
+
 struct type_name {
 	int type;
 	const char *name;
@@ -1533,7 +1535,15 @@ restart:
 	if (o->flags & TEST_PAN)
 		o->fb_width *= 2;
 
-	modifier = DRM_FORMAT_MOD_LINEAR;
+	if (igt_display_has_format_mod(&display, DRM_FORMAT_XRGB8888,
+				       I915_FORMAT_MOD_4_TILED))
+		modifier = I915_FORMAT_MOD_4_TILED;
+	else if (igt_display_has_format_mod(&display, DRM_FORMAT_XRGB8888,
+					    I915_FORMAT_MOD_X_TILED))
+		modifier = I915_FORMAT_MOD_X_TILED;
+	else
+		modifier = DRM_FORMAT_MOD_LINEAR;
+
 	if (o->flags & TEST_FENCE_STRESS)
 		modifier = I915_FORMAT_MOD_X_TILED;
 
@@ -2034,7 +2044,6 @@ igt_main_args("e", NULL, help_str, opt_handler, NULL)
 		{ 0, TEST_BO_TOOBIG | TEST_NO_2X_OUTPUT, "bo-too-big" },
 		{ 10, TEST_FLIP | TEST_SUSPEND, "flip-vs-suspend" },
 	};
-	igt_display_t display;
 	int i;
 
 	igt_fixture {
-- 
2.43.0