diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-11-15 10:02:39 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-11-15 10:02:39 +0100 |
| commit | c09cd6e9691ec6fce8cb90b65929cad389d39c84 (patch) | |
| tree | d76104420f72172b21b8fb5ca512baa016ac892b /drivers/gpu/drm/drm_irq.c | |
| parent | 7eb1c496f7ac0f386552c0cd9144f6965fc61da5 (diff) | |
| parent | 96ab4c70396e4e5a4d623bc95e86484682bef78f (diff) | |
Merge branch 'backlight-rework' into drm-intel-next-queued
Pull in Jani's backlight rework branch. This was merged through a
separate branch to be able to sort out the Broadwell conflicts
properly before pulling it into the main development branch.
Conflicts:
drivers/gpu/drm/i915/intel_display.c
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index f9af048828e..d80d95289e1 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -219,7 +219,7 @@ int drm_vblank_init(struct drm_device *dev, int num_crtcs) for (i = 0; i < num_crtcs; i++) init_waitqueue_head(&dev->vblank[i].queue); - DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); + DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); /* Driver specific high-precision vblank timestamping supported? */ if (dev->driver->get_vblank_timestamp) @@ -586,24 +586,20 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, * code gets preempted or delayed for some reason. */ for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { - /* Disable preemption to make it very likely to - * succeed in the first iteration even on PREEMPT_RT kernel. + /* + * Get vertical and horizontal scanout position vpos, hpos, + * and bounding timestamps stime, etime, pre/post query. */ - preempt_disable(); + vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, + &hpos, &stime, &etime); - /* Get system timestamp before query. */ - 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. */ - etime = ktime_get(); + /* + * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if + * CLOCK_REALTIME is requested. + */ if (!drm_timestamp_monotonic) mono_time_offset = ktime_get_monotonic_offset(); - preempt_enable(); - /* Return as no-op if scanout query unsupported or failed. */ if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", @@ -611,6 +607,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, return -EIO; } + /* Compute uncertainty in timestamp of scanout position query. */ duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); /* Accept result with < max_error nsecs timing uncertainty. */ |