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97 lines
3.4 KiB
97 lines
3.4 KiB
From aa6e148bb75f76291e9625316f1f7c73458daf47 Mon Sep 17 00:00:00 2001
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From: David H <davidjhu@gmail.com>
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Date: Wed, 4 Oct 2017 04:43:07 -0700
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Subject: [PATCH 200/454] bcm2835-camera: Fix timestamp calculation problem
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(#2214)
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* bcm2835-camera: Fix timestamp calculation problem
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Use div_s64_rem() to convert usec timestamp to timeval
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to avoid integer signedness bug.
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* bcm2835-camera: Store kernel start time in NSEC instead of USEC
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* bcm2835-camera: Reword debug message for clarity
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---
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.../bcm2835-camera/bcm2835-camera.c | 41 +++++--------------
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.../bcm2835-camera/bcm2835-camera.h | 2 +-
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2 files changed, 11 insertions(+), 32 deletions(-)
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--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
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+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
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@@ -348,37 +348,17 @@ static void buffer_cb(struct vchiq_mmal_
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buf->vb.vb2_buf.timestamp);
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} else if(pts != 0) {
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- struct timeval timestamp;
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s64 runtime_us = pts -
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dev->capture.vc_start_timestamp;
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- u32 div = 0;
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- u32 rem = 0;
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-
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- div =
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- div_u64_rem(runtime_us, USEC_PER_SEC, &rem);
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- timestamp.tv_sec =
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- dev->capture.kernel_start_ts.tv_sec + div;
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- timestamp.tv_usec =
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- dev->capture.kernel_start_ts.tv_usec + rem;
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-
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- if (timestamp.tv_usec >=
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- USEC_PER_SEC) {
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- timestamp.tv_sec++;
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- timestamp.tv_usec -=
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- USEC_PER_SEC;
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- }
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+ buf->vb.vb2_buf.timestamp = (runtime_us * NSEC_PER_USEC) +
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+ dev->capture.kernel_start_timestamp;
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v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
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- "Convert start time %d.%06d and %llu "
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- "with offset %llu to %d.%06d\n",
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- (int)dev->capture.kernel_start_ts.
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- tv_sec,
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- (int)dev->capture.kernel_start_ts.
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- tv_usec,
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- dev->capture.vc_start_timestamp, pts,
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- (int)timestamp.tv_sec,
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- (int)timestamp.tv_usec);
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- buf->vb.vb2_buf.timestamp = timestamp.tv_sec * 1000000000ULL +
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- timestamp.tv_usec * 1000ULL;
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+ "Buffer time set as converted timestamp - %llu "
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+ "= (pts [%lld usec] - vc start time [%llu usec]) "
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+ "+ kernel start time [%llu nsec]\n",
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+ buf->vb.vb2_buf.timestamp,
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+ pts, dev->capture.vc_start_timestamp,
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+ dev->capture.kernel_start_timestamp);
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} else {
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if (dev->capture.last_timestamp) {
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buf->vb.vb2_buf.timestamp = dev->capture.last_timestamp;
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@@ -388,8 +368,7 @@ static void buffer_cb(struct vchiq_mmal_
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}
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else {
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buf->vb.vb2_buf.timestamp =
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- dev->capture.kernel_start_ts.tv_sec * 1000000000ULL +
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- dev->capture.kernel_start_ts.tv_usec * 1000ULL;
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+ dev->capture.kernel_start_timestamp;
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v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
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"Buffer time set as start timestamp - %lld",
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buf->vb.vb2_buf.timestamp);
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@@ -574,7 +553,7 @@ static int start_streaming(struct vb2_qu
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dev->capture.last_timestamp = 0;
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- v4l2_get_timestamp(&dev->capture.kernel_start_ts);
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+ dev->capture.kernel_start_timestamp = ktime_get_ns();
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/* enable the camera port */
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dev->capture.port->cb_ctx = dev;
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--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.h
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+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.h
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@@ -92,7 +92,7 @@ struct bm2835_mmal_dev {
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/* VC start timestamp for streaming */
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s64 vc_start_timestamp;
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/* Kernel start timestamp for streaming */
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- struct timeval kernel_start_ts;
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+ u64 kernel_start_timestamp;
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/* Timestamp of last frame */
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u64 last_timestamp;
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