[Intel-gfx] [PATCH i-g-t 2/9] lib/kms: Track need for vblank wait locally

[Matt Roper]

The need to wait for a vblank after programming is due to the way we
actually program the hardware.  Move need_wait_for_vblank out of the
pipe and into a local variable in preparation for future programming
styles (e.g., atomic pageflip) that will need different logic.

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 lib/igt_kms.c | 15 ++++++++++-----
 lib/igt_kms.h |  1 -
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 1e7b901..3f561e9 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -759,13 +759,11 @@ static int igt_cursor_commit(igt_plane_t *plane, igt_output_t *output)
 static int igt_drm_plane_commit(igt_plane_t *plane, igt_output_t *output)
 {
 	igt_display_t *display = output->display;
-	igt_pipe_t *pipe;
 	uint32_t fb_id, crtc_id;
 	int ret;
 
 	fb_id = igt_plane_get_fb_id(plane);
 	crtc_id = output->config.crtc->crtc_id;
-	pipe = igt_output_get_driving_pipe(output);
 
 	if (plane->fb_changed && fb_id == 0) {
 		LOG(display,
@@ -814,7 +812,6 @@ static int igt_drm_plane_commit(igt_plane_t *plane, igt_output_t *output)
 
 		plane->fb_changed = false;
 		plane->position_changed = false;
-		pipe->need_wait_for_vblank = true;
 	}
 
 	return 0;
@@ -840,6 +837,7 @@ static int igt_output_commit(igt_output_t *output)
 	igt_plane_t *primary;
 	igt_plane_t *cursor;
 	int i;
+	bool need_wait_for_vblank = false;
 
 	pipe = igt_output_get_driving_pipe(output);
 	primary = igt_pipe_get_plane(pipe, IGT_PLANE_PRIMARY);
@@ -925,17 +923,24 @@ static int igt_output_commit(igt_output_t *output)
 		igt_assert(ret == 0);
 
 		cursor->fb_changed = false;
+		need_wait_for_vblank = true;
 	}
 
 	for (i = 0; i < pipe->n_planes; i++) {
 		igt_plane_t *plane = &pipe->planes[i];
 
+		if (plane->fb_changed || plane->position_changed)
+			need_wait_for_vblank = true;
+
 		igt_plane_commit(plane, output);
 	}
 
-	if (pipe->need_wait_for_vblank) {
+	/*
+	 * If the crtc is enabled, wait until the next vblank before returning
+	 * if we made changes to any of the planes.
+	 */
+	if (need_wait_for_vblank && igt_plane_get_fb_id(primary) != 0) {
 		igt_wait_for_vblank(display->drm_fd, pipe->pipe);
-		pipe->need_wait_for_vblank = false;
 	}
 
 	return 0;
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 88b695a..a9a4236 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -120,7 +120,6 @@ typedef struct {
 struct igt_pipe {
 	igt_display_t *display;
 	enum pipe pipe;
-	unsigned int need_wait_for_vblank : 1;
 #define IGT_MAX_PLANES	4
 	int n_planes;
 	igt_plane_t planes[IGT_MAX_PLANES];
-- 
1.8.5.1