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From b897295ffd88f1046e7150a084d57c41ced4cb9e Mon Sep 17 00:00:00 2001
From: "Miguel A. Vico" <mvicomoya@nvidia.com>
Date: Tue, 1 Mar 2016 22:19:14 +0100
Subject: [PATCH 4/6] backend-drm: Gracefully handle vblank and flip invalid
timestamps
Instant query for vblank timestamp may always fail, resulting in
never scheduling a full repaint in drm_output_start_repaint_loop().
Additionally, timestamp provided in page_flip_handler() may also be
invalid.
This change makes both drm_output_start_repaint_loop() and
page_flip_handler() to schedule a full repaint in any of the
situations above.
Signed-off-by: Miguel A Vico Moya <mvicomoya@nvidia.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
---
libweston/backend-drm/drm.c | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)
diff --git a/libweston/backend-drm/drm.c b/libweston/backend-drm/drm.c
index 2780f3bd..94a2bf2a 100644
--- a/libweston/backend-drm/drm.c
+++ b/libweston/backend-drm/drm.c
@@ -4,6 +4,7 @@
* Copyright © 2017, 2018 Collabora, Ltd.
* Copyright © 2017, 2018 General Electric Company
* Copyright (c) 2018 DisplayLink (UK) Ltd.
+ * Copyright © 2016-2019 NVIDIA Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
@@ -319,6 +320,19 @@ drm_output_update_complete(struct drm_output *output, uint32_t flags,
ts.tv_sec = sec;
ts.tv_nsec = usec * 1000;
+
+ /* Zero timestamp means failure to get valid timestamp, so
+ * immediately finish frame
+ *
+ * FIXME: Driver should never return an invalid page flip
+ * timestamp */
+ if (ts.tv_sec == 0 && ts.tv_nsec == 0) {
+ weston_compositor_read_presentation_clock(
+ output->base.compositor,
+ &ts);
+ flags = WP_PRESENTATION_FEEDBACK_INVALID;
+ }
+
weston_output_finish_frame(&output->base, &ts, flags);
/* We can't call this from frame_notify, because the output's
@@ -555,8 +569,16 @@ drm_output_start_repaint_loop(struct weston_output *output_base)
vbl.request.type |= drm_waitvblank_pipe(output);
ret = drmWaitVBlank(backend->drm.fd, &vbl);
- /* Error ret or zero timestamp means failure to get valid timestamp */
- if ((ret == 0) && (vbl.reply.tval_sec > 0 || vbl.reply.tval_usec > 0)) {
+ if (ret) {
+ /* Immediate query failed. It may always fail so we'll never get
+ * a valid timestamp to update msc and call into finish frame.
+ * Hence, jump to finish frame here.
+ */
+ goto finish_frame;
+ }
+
+ /* Zero timestamp means failure to get valid timestamp */
+ if (vbl.reply.tval_sec > 0 || vbl.reply.tval_usec > 0) {
ts.tv_sec = vbl.reply.tval_sec;
ts.tv_nsec = vbl.reply.tval_usec * 1000;
@@ -577,7 +599,7 @@ drm_output_start_repaint_loop(struct weston_output *output_base)
}
}
- /* Immediate query didn't provide valid timestamp.
+ /* Immediate query succeeded, but didn't provide valid timestamp.
* Use pageflip fallback.
*/
--
2.25.1
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