[igt-dev] [PATCH i-g-t] tests/kms_plane_lowres: Use highest and lowest resolution for testing

[Mika Kahola]

Sometimes the delta between the highest (the selected default mode) and
lowest resolution is not big enough to carry out tests succesfully. Hence,
let's change the test procedure so that we select the highest available mode
for high resolution case and the lowest possible mode for low resolution case.

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 tests/kms_plane_lowres.c | 52 +++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/tests/kms_plane_lowres.c b/tests/kms_plane_lowres.c
index a5af1f8a..87be3f55 100644
--- a/tests/kms_plane_lowres.c
+++ b/tests/kms_plane_lowres.c
@@ -54,31 +54,25 @@ typedef struct {
 	int x, y;
 } data_t;
 
-static drmModeModeInfo
-get_lowres_mode(int drmfd, igt_output_t *output,
-		const drmModeModeInfo *mode_default)
+static drmModeModeInfo *
+get_mode(int drmfd, igt_output_t *output, bool lowres)
 {
-	const drmModeModeInfo *mode;
-	bool found = false;
-	int limit = mode_default->vdisplay - SIZE;
+	drmModeModeInfo *mode, *tmp;
 	int j;
 
-	for (j = 0; j < output->config.connector->count_modes; j++) {
-		mode = &output->config.connector->modes[j];
-		if (mode->vdisplay < limit) {
-			found = true;
-			break;
+	mode = &output->config.connector->modes[0];
+	for (j = 1; j < output->config.connector->count_modes; j++) {
+		tmp = &output->config.connector->modes[j];
+		if (lowres) {
+			if (tmp->vdisplay < mode->vdisplay)
+				mode = tmp;
+		} else {
+			if (tmp->vdisplay > mode->vdisplay)
+				mode = tmp;
 		}
 	}
 
-	if (!found) {
-		igt_require_f(mode_default->vdisplay - SIZE > 768,
-			      "Current mode not tall enough; plane would still be onscreen after switch to 10x7.\n");
-
-		return *igt_std_1024_mode_get();
-	}
-
-	return *mode;
+	return mode;
 }
 
 static igt_plane_t *first_sdr_plane(igt_output_t *output, uint32_t devid)
@@ -164,8 +158,7 @@ static void create_ref_fb(data_t *data, uint64_t modifier,
 static unsigned
 test_planes_on_pipe_with_output(data_t *data, igt_plane_t *plane, uint64_t modifier)
 {
-	const drmModeModeInfo *mode;
-	drmModeModeInfo mode_lowres;
+	drmModeModeInfo *mode, *mode_lowres;
 	igt_pipe_crc_t *pipe_crc;
 	unsigned tested = 0;
 	igt_plane_t *primary;
@@ -174,8 +167,11 @@ test_planes_on_pipe_with_output(data_t *data, igt_plane_t *plane, uint64_t modif
 	igt_output_set_pipe(data->output, data->pipe);
 
 	primary = compatible_main_plane(plane, data->output, data->devid);
-	mode = igt_output_get_mode(data->output);
-	mode_lowres = get_lowres_mode(data->drm_fd, data->output, mode);
+	mode = get_mode(data->drm_fd, data->output, false);
+	mode_lowres = get_mode(data->drm_fd, data->output, true);
+
+	igt_require_f(mode->vdisplay - mode_lowres->vdisplay > SIZE,
+		      "Current mode not tall enough; plane would still be onscreen after switch to the lowest resolution.\n");
 
 	igt_create_color_pattern_fb(data->drm_fd, mode->hdisplay, mode->vdisplay,
 				    DRM_FORMAT_XRGB8888, modifier, 0.0, 0.0, 1.0,
@@ -194,17 +190,17 @@ test_planes_on_pipe_with_output(data_t *data, igt_plane_t *plane, uint64_t modif
 				    1.0, 1.0, 0.0, &data->fb_plane[1]);
 
 	create_ref_fb(data, modifier, mode, &data->ref_hires.fb);
-	create_ref_fb(data, modifier, &mode_lowres, &data->ref_lowres.fb);
+	create_ref_fb(data, modifier, mode_lowres, &data->ref_lowres.fb);
 
 	pipe_crc = igt_pipe_crc_new(data->drm_fd, data->pipe,
 				    INTEL_PIPE_CRC_SOURCE_AUTO);
 
-	igt_output_override_mode(data->output, &mode_lowres);
+	igt_output_override_mode(data->output, mode_lowres);
 	igt_plane_set_fb(primary, &data->ref_lowres.fb);
 	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 	igt_pipe_crc_collect_crc(pipe_crc, &data->ref_lowres.crc);
 
-	igt_output_override_mode(data->output, NULL);
+	igt_output_override_mode(data->output, mode);
 	igt_plane_set_fb(primary, &data->ref_hires.fb);
 	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 	igt_pipe_crc_collect_crc(pipe_crc, &data->ref_hires.crc);
@@ -221,13 +217,13 @@ test_planes_on_pipe_with_output(data_t *data, igt_plane_t *plane, uint64_t modif
 	igt_pipe_crc_collect_crc(pipe_crc, &crc_hires1);
 
 	/* switch to lower resolution */
-	igt_output_override_mode(data->output, &mode_lowres);
+	igt_output_override_mode(data->output, mode_lowres);
 	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 
 	igt_pipe_crc_collect_crc(pipe_crc, &crc_lowres);
 
 	/* switch back to higher resolution */
-	igt_output_override_mode(data->output, NULL);
+	igt_output_override_mode(data->output, mode);
 	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 
 	igt_pipe_crc_collect_crc(pipe_crc, &crc_hires2);
-- 
2.25.1