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Subject: [media] uvcvideo: Disable hardware timestamps by default
Author:  Laurent Pinchart <[email protected]>
Date:    Mon Jul 27 11:06:48 2015 -0300

The hardware timestamping implementation has been reported as not
working correctly on at least the Logitech C920. Until this can be
fixed, disable it by default.

Reported-by: Peter Rabbitson <[email protected]>
Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

 drivers/media/usb/uvc/uvc_driver.c |    3 +++
 drivers/media/usb/uvc/uvc_video.c  |    3 +++
 drivers/media/usb/uvc/uvcvideo.h   |    1 +
 3 files changed, 7 insertions(+), 0 deletions(-)

---

http://git.linuxtv.org/cgit.cgi/media_tree.git/commit/?id=5d0fd3c806b9e932010931ae67dbb482020e0882

diff --git a/drivers/media/usb/uvc/uvc_driver.c 
b/drivers/media/usb/uvc/uvc_driver.c
index 4b5b3e8..d11fd6a 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -32,6 +32,7 @@
 #define DRIVER_DESC            "USB Video Class driver"
 
 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
+unsigned int uvc_hw_timestamps_param;
 unsigned int uvc_no_drop_param;
 static unsigned int uvc_quirks_param = -1;
 unsigned int uvc_trace_param;
@@ -2078,6 +2079,8 @@ static int uvc_clock_param_set(const char *val, struct 
kernel_param *kp)
 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
                  &uvc_clock_param, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
+module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, 
S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
diff --git a/drivers/media/usb/uvc/uvc_video.c 
b/drivers/media/usb/uvc/uvc_video.c
index f839654..1c4a117 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -623,6 +623,9 @@ void uvc_video_clock_update(struct uvc_streaming *stream,
        u32 rem;
        u64 y;
 
+       if (!uvc_hw_timestamps_param)
+               return;
+
        spin_lock_irqsave(&clock->lock, flags);
 
        if (clock->count < clock->size)
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 816dd1a..1374bd9 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -593,6 +593,7 @@ extern unsigned int uvc_clock_param;
 extern unsigned int uvc_no_drop_param;
 extern unsigned int uvc_trace_param;
 extern unsigned int uvc_timeout_param;
+extern unsigned int uvc_hw_timestamps_param;
 
 #define uvc_trace(flag, msg...) \
        do { \

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