[i-g-t V2 2/3] tests/kms_hdr: Skip if current & requested BPC doesn't match

[Bhanuprakash Modem]

The "max bpc" property only ensures that the bpc will not go beyond
the value set through this property. It does not guarantee that the
same bpc will be used for the given mode.

If clock/bandwidth constraints permit, the max bpc will be used to
show the mode, otherwise the bpc will be reduced. So, if we really
want a particular bpc set, we can try reducing the resolution, till
we get the bpc that we set in max bpc property.

This patch will skip the test, if there is no valid resolution to get
the same bpc as set by max_bpc property.

V2:
* Refactor the logic

Cc: Swati Sharma <swati2.sharma at intel.com>
CC: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_hdr.c | 55 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 49 insertions(+), 6 deletions(-)

diff --git a/tests/kms_hdr.c b/tests/kms_hdr.c
index fb2e0790..f9b7dfc2 100644
--- a/tests/kms_hdr.c
+++ b/tests/kms_hdr.c
@@ -144,8 +144,6 @@ static void test_bpc_switch_on_output(data_t *data, enum pipe pipe,
 	igt_fb_t afb;
 	int afb_id, ret;
 
-	prepare_test(data, output, pipe);
-
 	/* 10-bit formats are slow, so limit the size. */
 	afb_id = igt_create_fb(data->fd, 512, 512, DRM_FORMAT_XRGB2101010, 0, &afb);
 	igt_assert(afb_id);
@@ -206,6 +204,37 @@ static bool has_max_bpc(igt_output_t *output)
 	       igt_output_get_prop(output, IGT_CONNECTOR_MAX_BPC);
 }
 
+static bool i915_clock_constraint(data_t *data, int bpc, bool is_hdr)
+{
+	igt_output_t *output = data->output;
+	drmModeConnector *connector = output->config.connector;
+
+	igt_output_set_prop_value(data->output, IGT_CONNECTOR_MAX_BPC, bpc);
+	igt_sort_connector_modes(connector, sort_drm_modes_by_clk_dsc);
+
+	for_each_connector_mode(output) {
+		if (is_hdr && connector->modes[i__].hdisplay < 3840)
+			goto out;
+
+		igt_output_override_mode(output, &connector->modes[i__]);
+		igt_display_commit_atomic(&data->display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
+
+		if (!igt_check_output_bpc_equal(data->fd, data->pipe_id,
+						data->output->name, bpc))
+			continue;
+
+		data->mode = igt_output_get_mode(output);
+		data->w = data->mode->hdisplay;
+		data->h = data->mode->vdisplay;
+
+		return true;
+	}
+
+out:
+	test_fini(data);
+	return false;
+}
+
 static void test_bpc_switch(data_t *data, uint32_t flags)
 {
 	igt_display_t *display = &data->display;
@@ -217,8 +246,17 @@ static void test_bpc_switch(data_t *data, uint32_t flags)
 		if (!has_max_bpc(output))
 			continue;
 
+		if (igt_get_output_max_bpc(data->fd, output->name) < 10)
+			continue;
+
 		for_each_pipe(display, pipe) {
 			if (igt_pipe_connector_valid(pipe, output)) {
+				prepare_test(data, output, pipe);
+
+				if (is_i915_device(data->fd) &&
+				    !i915_clock_constraint(data, 10, false))
+					break;
+
 				igt_dynamic_f("pipe-%s-%s",
 					      kmstest_pipe_name(pipe), output->name)
 					test_bpc_switch_on_output(data, pipe, output, flags);
@@ -367,8 +405,6 @@ static void test_static_toggle(data_t *data, enum pipe pipe,
 	igt_fb_t afb;
 	int afb_id;
 
-	prepare_test(data, output, pipe);
-
 	/* 10-bit formats are slow, so limit the size. */
 	afb_id = igt_create_fb(data->fd, 512, 512, DRM_FORMAT_XRGB2101010, 0, &afb);
 	igt_assert(afb_id);
@@ -446,8 +482,6 @@ static void test_static_swap(data_t *data, enum pipe pipe, igt_output_t *output)
 	int afb_id;
 	struct hdr_output_metadata hdr;
 
-	prepare_test(data, output, pipe);
-
 	/* 10-bit formats are slow, so limit the size. */
 	afb_id = igt_create_fb(data->fd, 512, 512, DRM_FORMAT_XRGB2101010, 0, &afb);
 	igt_assert(afb_id);
@@ -532,8 +566,17 @@ static void test_hdr(data_t *data, uint32_t flags)
 		if (!is_panel_hdr(data, output))
 			continue;
 
+		if (igt_get_output_max_bpc(data->fd, output->name) < 10)
+			continue;
+
 		for_each_pipe(display, pipe) {
 			if (igt_pipe_connector_valid(pipe, output)) {
+				prepare_test(data, output, pipe);
+
+				if (is_i915_device(data->fd) &&
+				    !i915_clock_constraint(data, 10, true))
+					break;
+
 				igt_dynamic_f("pipe-%s-%s",
 					      kmstest_pipe_name(pipe), output->name) {
 					if (flags & TEST_NONE || flags & TEST_DPMS || flags & TEST_SUSPEND)
-- 
2.35.1