[i-g-t 05/16] tests/kms_color: New subtests for Plane degamma

[Bhanuprakash Modem]

To verify Plane degamma, draw 3 gradient rectangles in red, green and blue,
with a maxed out degamma LUT and verify we have the same CRC as drawing solid
color rectangles without degamma.

v2:
* Add support to validate 'no degamma' mode (Harry)
v3:
* Rebase
* Dynamic subtests

Cc: Harry Wentland <harry.wentland at amd.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Pekka Paalanen <ppaalanen at gmail.com>
Cc: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_color.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/tests/kms_color.c b/tests/kms_color.c
index 1c868ffb..0fd4a335 100644
--- a/tests/kms_color.c
+++ b/tests/kms_color.c
@@ -775,6 +775,121 @@ static bool plane_gamma_test(data_t *data, igt_plane_t *plane)
 	return ret;
 }
 
+static bool plane_degamma_test(data_t *data, igt_plane_t *plane)
+{
+	igt_output_t *output = data->output;
+	igt_display_t *display = &data->display;
+	drmModeModeInfo *mode = data->mode;
+	drmModePropertyPtr degamma_mode;
+	struct igt_fb fb;
+	uint32_t i;
+	bool ret = true;
+	igt_pipe_crc_t *pipe_crc = data->pipe_crc;
+	color_t red_green_blue[] = {
+		{ 1.0, 0.0, 0.0 },
+		{ 0.0, 1.0, 0.0 },
+		{ 0.0, 0.0, 1.0 }
+	};
+
+	igt_info("Plane degamma test is running on pipe-%s plane-%d(%s)\n",
+			kmstest_pipe_name(plane->pipe->pipe), plane->index,
+			kmstest_plane_type_name(plane->type));
+
+	igt_require(igt_plane_has_prop(plane, IGT_PLANE_DEGAMMA_MODE));
+	igt_require(igt_plane_has_prop(plane, IGT_PLANE_DEGAMMA_LUT));
+
+	igt_output_set_pipe(output, plane->pipe->pipe);
+
+	/* Create a framebuffer at the size of the output. */
+	igt_assert(igt_create_fb(data->drm_fd,
+			      mode->hdisplay,
+			      mode->vdisplay,
+			      DRM_FORMAT_XRGB8888,
+			      DRM_FORMAT_MOD_LINEAR,
+			      &fb));
+
+	igt_plane_set_fb(plane, &fb);
+
+	/* Disable Pipe color props. */
+	disable_ctm(plane->pipe);
+	disable_degamma(plane->pipe);
+	disable_gamma(plane->pipe);
+
+	disable_plane_ctm(plane);
+	disable_plane_gamma(plane);
+	igt_display_commit2(display, display->is_atomic ?
+					COMMIT_ATOMIC : COMMIT_LEGACY);
+
+	degamma_mode = get_plane_gamma_degamma_mode(plane, IGT_PLANE_DEGAMMA_MODE);
+
+	/* Iterate all supported degamma modes. */
+	for (i = 0; i < degamma_mode->count_enums; i++) {
+		igt_crc_t crc_degamma, crc_fullcolors;
+		segment_data_t *segment_info = NULL;
+		struct drm_color_lut_ext *lut = NULL;
+		uint32_t lut_size = 0;
+
+		igt_info("Trying to use degamma mode: \'%s\'\n", degamma_mode->enums[i].name);
+
+		/* Draw solid colors with no degamma. */
+		disable_plane_degamma(plane);
+		paint_rectangles(data, mode, red_green_blue, &fb);
+		igt_plane_set_fb(plane, &fb);
+		igt_display_commit2(display, display->is_atomic ?
+				COMMIT_ATOMIC : COMMIT_LEGACY);
+		igt_wait_for_vblank(data->drm_fd,
+				display->pipes[plane->pipe->pipe].crtc_offset);
+		igt_pipe_crc_collect_crc(pipe_crc, &crc_fullcolors);
+
+		/* 'no degamma' is intended to disable the degamma.
+		 * Hence, setting DEGAMMA_LUT to NULL (i.e disable_plane_degamma())
+		 * and setting DEGAMMA_MODE as 'no degamma' (i.e set_plane_degamma())
+		 * should produce the same result.
+		 */
+		if (strcmp(degamma_mode->enums[i].name, "no degamma")) {
+			segment_info = get_segment_data(data,
+							degamma_mode->enums[i].value,
+							degamma_mode->enums[i].name);
+			lut_size = sizeof(struct drm_color_lut_ext) * segment_info->entries_count;
+			lut = create_max_lut(segment_info);
+			if (is_i915_device(data->drm_fd))
+				lut[0].red = lut[0].green = lut[0].blue = 0; /* First entry is 0 for Intel h/w. */
+
+			/* Draw gradient colors with degamma LUT to remap all
+			 * values to max red/green/blue.
+			 */
+			paint_gradient_rectangles(data, mode, red_green_blue, &fb);
+			igt_plane_set_fb(plane, &fb);
+		}
+
+		set_plane_degamma(plane, degamma_mode->enums[i].name, lut, lut_size);
+		igt_display_commit2(display, display->is_atomic ?
+					COMMIT_ATOMIC : COMMIT_LEGACY);
+		igt_wait_for_vblank(data->drm_fd,
+				display->pipes[plane->pipe->pipe].crtc_offset);
+		igt_pipe_crc_collect_crc(pipe_crc, &crc_degamma);
+
+		/* Verify that the CRC of the software computed output
+		 * is equal to the CRC of the degamma LUT transformation
+		 * output.
+		 */
+		ret &= igt_check_crc_equal(&crc_degamma, &crc_fullcolors);
+
+		free(lut);
+		clear_segment_data(segment_info);
+	}
+
+	disable_plane_degamma(plane);
+	igt_plane_set_fb(plane, NULL);
+	igt_output_set_pipe(output, PIPE_NONE);
+	igt_display_commit2(display, display->is_atomic ?
+					COMMIT_ATOMIC : COMMIT_LEGACY);
+
+	drmModeFreeProperty(degamma_mode);
+
+	return ret;
+}
+
 static void
 prep_pipe(data_t *data, enum pipe p)
 {
@@ -1158,6 +1273,8 @@ run_tests_for_pipe(data_t *data)
 	} plane_gamma_degamma_tests[] = {
 		{ "plane-gamma", plane_gamma_test,
 		  "Compare maxed out plane gamma LUT and solid color linear LUT" },
+		{ "plane-degamma", plane_degamma_test,
+		  "Compare maxed out plane degamma LUT and solid color linear LUT" },
 	};
 	int i;
 
-- 
2.35.1