From mboxrd@z Thu Jan 1 00:00:00 1970 From: Imre Deak Subject: [PATCH 1/2] drm: use monotonic time in drm_calc_vbltimestamp_from_scanoutpos Date: Tue, 23 Oct 2012 21:53:25 +0300 Message-ID: <1351018407-7009-2-git-send-email-imre.deak@intel.com> References: <1351018407-7009-1-git-send-email-imre.deak@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1351018407-7009-1-git-send-email-imre.deak@intel.com> In-Reply-To: <1349444222-22274-1-git-send-email-imre.deak@intel.com> References: <1349444222-22274-1-git-send-email-imre.deak@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: Daniel Vetter , Chris Wilson , krh@freedesktop.org, Mario Kleiner , =?UTF-8?q?Michel=20D=C3=A4nzer?= Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org For measuring duration we want to avoid that our start/end timestamps jump, so use monotonic instead of real time for that. Signed-off-by: Imre Deak --- drivers/gpu/drm/drm_irq.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 89b830d..7dc203d 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -576,7 +576,8 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, unsigned flags, struct drm_crtc *refcrtc) { - struct timeval stime, raw_time; + ktime_t stime, etime, mono_time_offset; + struct timeval tv_etime; struct drm_display_mode *mode; int vbl_status, vtotal, vdisplay; int vpos, hpos, i; @@ -625,13 +626,14 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, preempt_disable(); /* Get system timestamp before query. */ - do_gettimeofday(&stime); + stime = ktime_get(); /* Get vertical and horizontal scanout pos. vpos, hpos. */ vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); /* Get system timestamp after query. */ - do_gettimeofday(&raw_time); + etime = ktime_get(); + mono_time_offset = ktime_get_monotonic_offset(); preempt_enable(); @@ -642,7 +644,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, return -EIO; } - duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime); + duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); /* Accept result with < max_error nsecs timing uncertainty. */ if (duration_ns <= (s64) *max_error) @@ -689,14 +691,18 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, vbl_status |= 0x8; } + 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 * vblank_time timestamp for end of vblank. */ - *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns); + etime = ktime_sub_ns(etime, delta_ns); + *vblank_time = ktime_to_timeval(etime); DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", crtc, (int)vbl_status, hpos, vpos, - (long)raw_time.tv_sec, (long)raw_time.tv_usec, + (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, (int)duration_ns/1000, i); -- 1.7.9.5