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-rw-r--r--drivers/gpu/drm/drm_ioctl.c3
-rw-r--r--drivers/gpu/drm/drm_irq.c25
-rw-r--r--drivers/gpu/drm/drm_stub.c8
-rw-r--r--include/drm/drmP.h1
-rw-r--r--include/uapi/drm/drm.h1
5 files changed, 33 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 23dd97506f28..e77bd8b57df2 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -287,6 +287,9 @@ int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
break;
+ case DRM_CAP_TIMESTAMP_MONOTONIC:
+ req->value = drm_timestamp_monotonic;
+ break;
default:
return -EINVAL;
}
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index ef5b5f70735e..c0f0046d8078 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -633,7 +633,8 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
/* Get system timestamp after query. */
etime = ktime_get();
- mono_time_offset = ktime_get_monotonic_offset();
+ if (!drm_timestamp_monotonic)
+ mono_time_offset = ktime_get_monotonic_offset();
preempt_enable();
@@ -691,7 +692,9 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
vbl_status |= 0x8;
}
- etime = ktime_sub(etime, mono_time_offset);
+ if (!drm_timestamp_monotonic)
+ etime = ktime_sub(etime, mono_time_offset);
+
/* save this only for debugging purposes */
tv_etime = ktime_to_timeval(etime);
/* Subtract time delta from raw timestamp to get final
@@ -714,6 +717,17 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
}
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
+static struct timeval get_drm_timestamp(void)
+{
+ ktime_t now;
+
+ now = ktime_get();
+ if (!drm_timestamp_monotonic)
+ now = ktime_sub(now, ktime_get_monotonic_offset());
+
+ return ktime_to_timeval(now);
+}
+
/**
* drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
* vblank interval.
@@ -751,9 +765,9 @@ u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
}
/* GPU high precision timestamp query unsupported or failed.
- * Return gettimeofday timestamp as best estimate.
+ * Return current monotonic/gettimeofday timestamp as best estimate.
*/
- do_gettimeofday(tvblank);
+ *tvblank = get_drm_timestamp();
return 0;
}
@@ -842,7 +856,8 @@ void drm_send_vblank_event(struct drm_device *dev, int crtc,
seq = drm_vblank_count_and_time(dev, crtc, &now);
} else {
seq = 0;
- do_gettimeofday(&now);
+
+ now = get_drm_timestamp();
}
send_vblank_event(dev, e, seq, &now);
}
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 6fcdd8ebcb3d..200e104f1fa0 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -46,16 +46,24 @@ EXPORT_SYMBOL(drm_vblank_offdelay);
unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
EXPORT_SYMBOL(drm_timestamp_precision);
+/*
+ * Default to use monotonic timestamps for wait-for-vblank and page-flip
+ * complete events.
+ */
+unsigned int drm_timestamp_monotonic = 1;
+
MODULE_AUTHOR(CORE_AUTHOR);
MODULE_DESCRIPTION(CORE_DESC);
MODULE_LICENSE("GPL and additional rights");
MODULE_PARM_DESC(debug, "Enable debug output");
MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
+MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
module_param_named(debug, drm_debug, int, 0600);
module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
+module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
struct idr drm_minors_idr;
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 29eb23799aa4..fad21c927a38 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1505,6 +1505,7 @@ extern unsigned int drm_debug;
extern unsigned int drm_vblank_offdelay;
extern unsigned int drm_timestamp_precision;
+extern unsigned int drm_timestamp_monotonic;
extern struct class *drm_class;
extern struct proc_dir_entry *drm_proc_root;
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 1e3481edf062..8d1e2bbee83a 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -778,6 +778,7 @@ struct drm_event_vblank {
#define DRM_CAP_DUMB_PREFERRED_DEPTH 0x3
#define DRM_CAP_DUMB_PREFER_SHADOW 0x4
#define DRM_CAP_PRIME 0x5
+#define DRM_CAP_TIMESTAMP_MONOTONIC 0x6
#define DRM_PRIME_CAP_IMPORT 0x1
#define DRM_PRIME_CAP_EXPORT 0x2
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