[PATCH i-g-t 2/3] tests/kms_bw: allow physically connected only

[Kunal Joshi <kunal1.joshi@intel.com>]

modify kms_bw test to only run on physically connected displays,
avoiding issues with forcing a 4K EDID on disconnected connectors.

For instance, consider a system with 2 DP and 2 HDMI connectors
(DP-1, DP-2, HDMI-1, HDMI-2). Forcing EDID on DP is currently problematic,
and we only support forcing for HDMI. However, if there's only one
TMDS encoder, we can only drive one HDMI display, not two.

For now, the test will only run on physically connected displays.
Future improvements may consider the encoder count to handle such
scenarios more gracefully.

Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 tests/kms_bw.c | 43 ++++++++++++++++++-------------------------
 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/tests/kms_bw.c b/tests/kms_bw.c
index b50f324af..4aabb02b7 100644
--- a/tests/kms_bw.c
+++ b/tests/kms_bw.c
@@ -61,6 +61,7 @@ typedef struct data {
         int h[IGT_MAX_PIPES];
         int fd;
 	int num_pipes;
+	int num_outputs;
 } data_t;
 
 static drmModeModeInfo test_mode[] = {
@@ -105,8 +106,9 @@ static drmModeModeInfo test_mode[] = {
 static void test_init(data_t *data)
 {
 	igt_display_t *display = &data->display;
-	int i, max_pipes = display->n_pipes;
+	int i;
 	igt_output_t *output;
+	data->num_outputs = 0;
 
 	for_each_pipe(display, i) {
 		data->pipe_id[i] = i;
@@ -118,23 +120,22 @@ static void test_init(data_t *data)
 					 IGT_PIPE_CRC_SOURCE_AUTO);
 	}
 
-	for (i = 0; i < display->n_outputs && i < max_pipes; i++) {
-		if (!data->pipe[i])
-			continue;
-
-		output = &display->outputs[i];
-
-		data->output[i] = output;
+	i = 0;
 
+	for_each_output(display, output) {
 		/* Only allow physically connected displays for the tests. */
 		if (!igt_output_is_connected(output))
 			continue;
 
+		data->output[i] = output;
+		data->num_outputs++;
+
 		igt_assert(kmstest_get_connector_default_mode(
 			data->fd, output->config.connector, &data->mode[i]));
 
 		data->w[i] = data->mode[i].hdisplay;
 		data->h[i] = data->mode[i].vdisplay;
+		i++;
 	}
 
 
@@ -156,27 +157,12 @@ static void test_fini(data_t *data)
 	igt_display_commit_atomic(display, DRM_MODE_ATOMIC_ALLOW_MODESET, 0);
 }
 
-/* Forces a mode for a connector. */
-static void force_output_mode(data_t *d, igt_output_t *output,
-			      const drmModeModeInfo *mode)
-{
-	/* This allows us to create a virtual sink. */
-	if (!igt_output_is_connected(output)) {
-		kmstest_force_edid(d->fd, output->config.connector,
-				   igt_kms_get_4k_edid());
-
-		kmstest_force_connector(d->fd, output->config.connector,
-					FORCE_CONNECTOR_DIGITAL);
-	}
-
-	igt_output_override_mode(output, mode);
-}
-
 static void run_test_linear_tiling(data_t *data, int pipe, const drmModeModeInfo *mode) {
 	igt_display_t *display = &data->display;
 	igt_output_t *output;
 	struct igt_fb buffer[IGT_MAX_PIPES];
 	igt_crc_t zero, captured[IGT_MAX_PIPES];
+	int i = 0;
 	int ret;
 
 	igt_skip_on_f(pipe >= data->num_pipes,
@@ -184,6 +170,10 @@ static void run_test_linear_tiling(data_t *data, int pipe, const drmModeModeInfo
 
 	test_init(data);
 
+	igt_skip_on_f(pipe >= data->num_outputs,
+				  "%d connected outputs required but found %d\n",
+				  pipe+1, data->num_outputs+1);
+
 	/* create buffers */
 	for (i = 0; i <= pipe; i++) {
 		output = data->output[i];
@@ -191,7 +181,7 @@ static void run_test_linear_tiling(data_t *data, int pipe, const drmModeModeInfo
 			continue;
 		}
 
-		force_output_mode(data, output, mode);
+		igt_output_override_mode(output, mode);
 
 		igt_create_color_fb(display->drm_fd, mode->hdisplay,
 				    mode->vdisplay, DRM_FORMAT_XRGB8888,
@@ -199,6 +189,9 @@ static void run_test_linear_tiling(data_t *data, int pipe, const drmModeModeInfo
 				    &buffer[i]);
 
 		igt_output_set_pipe(output, i);
+		igt_info("Assigned output %s to pipe %s with mode %dx%d@%d\n",
+				 igt_output_name(output), kmstest_pipe_name(i),
+				 mode->hdisplay, mode->vdisplay, mode->vrefresh);
 
 		igt_plane_set_fb(data->primary[i], &buffer[i]);
 	}
-- 
2.34.1