[igt-dev] [v2 i-g-t 1/5] lib/igt_kms: helper to override the mode on all connectors

[Bhanuprakash Modem]

This helper will iterate through all connectors those have a
pending_pipe != PIPE_NONE set by the test upto the point of
calling this helper. And find the combination by using
ATOMIC_TEST_ONLY then return to the test.

This helper would override the mode on all connectors that will
be modeset by the next igt_display_commit() call in the test.

V2:
* Remove MST specific logic (Daniel)

Cc: Imre Deak <imre.deak at intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Cc: Petri Latvala <petri.latvala at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 lib/igt_kms.c | 40 ++++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 41 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 08d429a81..ae03cc892 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -3841,6 +3841,46 @@ void igt_output_set_pipe(igt_output_t *output, enum pipe pipe)
 	}
 }
 
+#define for_each_connector_mode(output)		\
+	for (int i__ = 0;  i__ < output->config.connector->count_modes; i__++)
+
+static
+bool __override_all_active_output_modes_to_fit_link_bw(igt_display_t *display, int base)
+{
+	for ( ; base < display->n_outputs; base++) {
+		igt_output_t *output = &display->outputs[base];
+
+		if (output->pending_pipe == PIPE_NONE)
+			continue;
+
+		for_each_connector_mode(output) {
+			igt_output_override_mode(output, &output->config.connector->modes[i__]);
+			if(__override_all_active_output_modes_to_fit_link_bw(display, base + 1))
+				return true;
+
+			if(igt_display_try_commit_atomic(display,
+					DRM_MODE_ATOMIC_TEST_ONLY |
+					DRM_MODE_ATOMIC_ALLOW_MODESET,
+					NULL) == 0)
+				return true;
+		}
+	}
+	return false;
+}
+
+/**
+ * override_all_active_output_modes_to_fit_link_bw:
+ * @display: a pointer to an #igt_display_t structure
+ *
+ * Override the mode on all connectors those are sharing the link bw
+ *
+ * Returns: true if a valid connector mode combo found, else false
+ */
+bool override_all_active_output_modes_to_fit_link_bw(igt_display_t *display)
+{
+	return __override_all_active_output_modes_to_fit_link_bw(display, 0);
+}
+
 /*
  * igt_pipe_refresh:
  * @display: a pointer to an #igt_display_t structure
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 09b10b3e0..518dfffba 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -892,5 +892,6 @@ void igt_require_pipe(igt_display_t *display,
 
 void igt_dump_connectors_fd(int drmfd);
 void igt_dump_crtcs_fd(int drmfd);
+bool override_all_active_output_modes_to_fit_link_bw(igt_display_t *display);
 
 #endif /* __IGT_KMS_H__ */
-- 
2.20.1