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Subject[PATCH 1/8] [media] uvc_video: use ktime_t for stats
Date
'struct timespec' works fine here, but we try to migrate
away from it in favor of ktime_t or timespec64. In this
case, using ktime_t produces the simplest code.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/media/usb/uvc/uvc_video.c | 11 ++++-------
drivers/media/usb/uvc/uvcvideo.h | 4 ++--
2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index fb86d6af398d..d6bee37cd1b8 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -725,7 +725,7 @@ static void uvc_video_stats_decode(struct uvc_streaming *stream,

if (stream->stats.stream.nb_frames == 0 &&
stream->stats.frame.nb_packets == 0)
- ktime_get_ts(&stream->stats.stream.start_ts);
+ stream->stats.stream.start_ts = ktime_get();

switch (data[1] & (UVC_STREAM_PTS | UVC_STREAM_SCR)) {
case UVC_STREAM_PTS | UVC_STREAM_SCR:
@@ -865,16 +865,13 @@ size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
{
unsigned int scr_sof_freq;
unsigned int duration;
- struct timespec ts;
size_t count = 0;

- ts = timespec_sub(stream->stats.stream.stop_ts,
- stream->stats.stream.start_ts);
-
/* Compute the SCR.SOF frequency estimate. At the nominal 1kHz SOF
* frequency this will not overflow before more than 1h.
*/
- duration = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+ duration = ktime_ms_delta(stream->stats.stream.stop_ts,
+ stream->stats.stream.start_ts);
if (duration != 0)
scr_sof_freq = stream->stats.stream.scr_sof_count * 1000
/ duration;
@@ -915,7 +912,7 @@ static void uvc_video_stats_start(struct uvc_streaming *stream)

static void uvc_video_stats_stop(struct uvc_streaming *stream)
{
- ktime_get_ts(&stream->stats.stream.stop_ts);
+ stream->stats.stream.stop_ts = ktime_get();
}

/* ------------------------------------------------------------------------
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 05398784d1c8..a2c190937067 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -452,8 +452,8 @@ struct uvc_stats_frame {
};

struct uvc_stats_stream {
- struct timespec start_ts; /* Stream start timestamp */
- struct timespec stop_ts; /* Stream stop timestamp */
+ ktime_t start_ts; /* Stream start timestamp */
+ ktime_t stop_ts; /* Stream stop timestamp */

unsigned int nb_frames; /* Number of frames */

--
2.9.0
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