[igt-dev] [for trybot 7/7] lib/igt_kms: Add support for igt_display_readout_hw_state

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 lib/igt_kms.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 76 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index eb57f4a99454..11f23fcaaa81 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1776,6 +1776,81 @@ void igt_display_reset(igt_display_t *display)
 	}
 }
 
+/**
+ * igt_display_readout_hw_state:
+ * @display: a pointer to an #igt_display_t structure
+ *
+ * Reads in the current state for pipes, connectors and planes on @display.
+ * It will also set output->pending_pipe based on the current crtc the pipe
+ * is set on.
+ *
+ * This function requires an atomic driver, and will skip if not found.
+ * If the mode must be preserved across the entire test, then commits
+ * should be done atomically with the %DRM_MODE_ATOMIC_ALLOW_MODESET flag
+ * cleared.
+ */
+void igt_display_readout_hw_state(igt_display_t *display)
+{
+	enum pipe pipe;
+	int i;
+
+	igt_display_reset(display);
+
+	/*
+	 * igt_display matches closely the atomic interfaces, implementing
+	 * legacy readout would be a nice source of bugs.
+	 */
+	igt_require_f(display->is_atomic, "readout only implemented for atomic drivers\n");
+
+	for_each_pipe(display, pipe) {
+		igt_pipe_t *pipe_obj = &display->pipes[pipe];
+		igt_plane_t *plane;
+
+		for (i = 0; i < IGT_NUM_CRTC_PROPS; i++) {
+			if (igt_pipe_obj_has_prop(pipe_obj, i))
+				pipe_obj->values[i] = igt_pipe_obj_get_prop(pipe_obj, i);
+		}
+
+		for_each_plane_on_pipe(display, pipe, plane) {
+			for (i = 0; i < IGT_NUM_PLANE_PROPS; i++) {
+				if (igt_plane_has_prop(plane, i))
+					plane->values[i] = igt_plane_get_prop(plane, i);
+			}
+
+			plane->changed = 0;
+		}
+		pipe_obj->changed = 0;
+	}
+
+	for (i = 0; i < display->n_outputs; i++) {
+		igt_output_t *output = &display->outputs[i];
+		uint64_t crtc_id;
+		int j;
+
+		for (j = 0; j < IGT_NUM_CONNECTOR_PROPS; j++)
+			if (igt_output_has_prop(output, i))
+				output->values[i] = igt_output_get_prop(output, i);
+
+		crtc_id = output->values[IGT_CONNECTOR_CRTC_ID];
+
+		output->pending_pipe = output->config.pipe = PIPE_NONE;
+		output->changed = 0;
+
+		if (crtc_id) {
+			for_each_pipe(display, pipe) {
+				igt_pipe_t *pipe_obj = &display->pipes[pipe];
+
+				if (pipe_obj->crtc_id != crtc_id)
+					continue;
+
+				output->pending_pipe = output->config.pipe = pipe;
+				break;
+			}
+			igt_assert(output->pending_pipe != PIPE_NONE);
+		}
+	}
+}
+
 /**
  * igt_display_init:
  * @display: a pointer to an #igt_display_t structure
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index b75210393d3b..85e9564adf34 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -360,6 +360,7 @@ struct igt_display {
 void igt_display_init(igt_display_t *display, int drm_fd);
 void igt_display_fini(igt_display_t *display);
 void igt_display_reset(igt_display_t *display);
+void igt_display_readout_hw_state(igt_display_t *display);
 int  igt_display_commit2(igt_display_t *display, enum igt_commit_style s);
 int  igt_display_commit(igt_display_t *display);
 int  igt_display_try_commit_atomic(igt_display_t *display, uint32_t flags, void *user_data);
-- 
2.15.1