[igt-dev] [PATCH i-g-t 4/4] tests/kms_flip_scaled_crc: Validate NN scaling filter

[Swati Sharma <swati2.sharma@intel.com>]

SCALING_FILTER can be used either as plane scaler property
or CRTC scaler property.
The value of this property can be one of the following:
    Default:
             Driver's default scaling filter
    Nearest Neighbor:
             Nearest Neighbor scaling filter
If NN is used for scaling, sharpness is preserved
whereas if we use default scaling we can see blurriness
at edges.

v2: -no need to set pipe scaler filter property
v3: -addition of new lines to improve readability
    -use of SPDX licence placeholder
    -close(data.drm_fd)
v4: -instead of creating new i-g-t, tweaked kms_flip_scaled_crc
     to validate both default and nn scaling filters

Cc: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 lib/igt_kms.c                    | 16 +++++++++++
 lib/igt_kms.h                    |  1 +
 tests/i915/kms_flip_scaled_crc.c | 48 +++++++++++++++++++++++++++++---
 3 files changed, 61 insertions(+), 4 deletions(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 626a2567..fc3ad68b 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -912,6 +912,22 @@ const char *kmstest_connector_status_str(int status)
 	return find_type_name(connector_status_names, status);
 }
 
+enum drm_scaling_filter {
+	DRM_SCALING_FILTER_DEFAULT,
+	DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
+};
+
+static const struct type_name drm_scaling_filter[] = {
+	{ DRM_SCALING_FILTER_DEFAULT, "Default" },
+	{ DRM_SCALING_FILTER_NEAREST_NEIGHBOR, "Nearest Neighbor" },
+	{}
+};
+
+const char *kmstest_scaling_filter_str(int filter)
+{
+	return find_type_name(drm_scaling_filter, filter);
+}
+
 static const struct type_name connector_type_names[] = {
 	{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
 	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index bd05a13b..4b67708d 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -107,6 +107,7 @@ enum igt_custom_edid_type {
 const char *kmstest_encoder_type_str(int type);
 const char *kmstest_connector_status_str(int status);
 const char *kmstest_connector_type_str(int type);
+const char *kmstest_scaling_filter_str(int filter);
 
 void kmstest_dump_mode(drmModeModeInfo *mode);
 #define MAX_HDISPLAY_PER_PIPE 5120
diff --git a/tests/i915/kms_flip_scaled_crc.c b/tests/i915/kms_flip_scaled_crc.c
index e291add4..91851e5e 100644
--- a/tests/i915/kms_flip_scaled_crc.c
+++ b/tests/i915/kms_flip_scaled_crc.c
@@ -26,6 +26,11 @@
 
 IGT_TEST_DESCRIPTION("Test flipping between scaled/nonscaled framebuffers");
 
+enum {
+	DRM_SCALING_FILTER_DEFAULT,
+	DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
+};
+
 typedef struct {
 	int drm_fd;
 	igt_display_t display;
@@ -476,7 +481,7 @@ static void clear_lut(data_t *data, enum pipe pipe)
 
 static void test_flip_to_scaled(data_t *data, uint32_t index,
 				enum pipe pipe, igt_output_t *output,
-				drmModeModeInfoPtr modetoset)
+				drmModeModeInfoPtr modetoset, int flags)
 {
 	igt_plane_t *primary;
 	igt_crc_t small_crc, big_crc;
@@ -513,6 +518,7 @@ static void test_flip_to_scaled(data_t *data, uint32_t index,
 	igt_output_set_pipe(output, pipe);
 
 	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	igt_skip_on_f (!igt_plane_has_prop(primary, IGT_PLANE_SCALING_FILTER), "Plane scaling filter prop not supported");
 	igt_skip_on_f (!igt_plane_has_format_mod(primary, data->small_fb.drm_format,
 				      data->small_fb.modifier) ||
 		       !igt_plane_has_format_mod(primary, data->big_fb.drm_format,
@@ -528,6 +534,8 @@ static void test_flip_to_scaled(data_t *data, uint32_t index,
 	data->pipe_crc = igt_pipe_crc_new(data->drm_fd, pipe,
 					  INTEL_PIPE_CRC_SOURCE_AUTO);
 
+	igt_plane_set_prop_enum(primary, IGT_PLANE_SCALING_FILTER, kmstest_scaling_filter_str(flags));
+
 	igt_plane_set_position(primary, 0, 0);
 	igt_plane_set_fb(primary, &data->small_fb);
 	igt_plane_set_size(primary, data->attemptmodewidth,
@@ -613,9 +621,39 @@ igt_main
 		}
 	}
 
+	igt_describe("Tests with default plane scaling filter");
+	for (int index = 0; index < ARRAY_SIZE(flip_scenario_test); index++) {
+		igt_describe(flip_scenario_test[index].describe);
+		igt_subtest_with_dynamic_f("default-%s", flip_scenario_test[index].name) {
+			free_fbs(&data);
+			for_each_pipe(&data.display, pipe) {
+				bool found = false;
+				for_each_valid_output_on_pipe(&data.display, pipe, output) {
+					modetoset = find_mode(&data, output);
+					if (modetoset) {
+						found = true;
+						igt_dynamic_f("pipe-%s-valid-mode", kmstest_pipe_name(pipe))
+							test_flip_to_scaled(&data, index, pipe, output, modetoset,
+									    DRM_SCALING_FILTER_DEFAULT);
+						break;
+					}
+				}
+				if (!found) {
+					for_each_valid_output_on_pipe(&data.display, pipe, output) {
+						igt_dynamic_f("pipe-%s-default-mode", kmstest_pipe_name(pipe))
+							test_flip_to_scaled(&data, index, pipe, output, NULL,
+									    DRM_SCALING_FILTER_DEFAULT);
+					}
+				}
+				break;
+			}
+		}
+	}
+
+	igt_describe("Tests with nearest neighbor plane scaling filter");
 	for (int index = 0; index < ARRAY_SIZE(flip_scenario_test); index++) {
 		igt_describe(flip_scenario_test[index].describe);
-		igt_subtest_with_dynamic(flip_scenario_test[index].name) {
+		igt_subtest_with_dynamic_f("nn-%s", flip_scenario_test[index].name) {
 			free_fbs(&data);
 			for_each_pipe(&data.display, pipe) {
 				bool found = false;
@@ -624,14 +662,16 @@ igt_main
 					if (modetoset) {
 						found = true;
 						igt_dynamic_f("pipe-%s-valid-mode", kmstest_pipe_name(pipe))
-							test_flip_to_scaled(&data, index, pipe, output, modetoset);
+							test_flip_to_scaled(&data, index, pipe, output, modetoset,
+									    DRM_SCALING_FILTER_NEAREST_NEIGHBOR);
 						break;
 					}
 				}
 				if (!found) {
 					for_each_valid_output_on_pipe(&data.display, pipe, output) {
 						igt_dynamic_f("pipe-%s-default-mode", kmstest_pipe_name(pipe))
-							test_flip_to_scaled(&data, index, pipe, output, NULL);
+							test_flip_to_scaled(&data, index, pipe, output, NULL,
+									    DRM_SCALING_FILTER_NEAREST_NEIGHBOR);
 					}
 				}
 				break;
-- 
2.25.1