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| author | Mario Kleiner <mario.kleiner@tuebingen.mpg.de> | 2010-12-08 04:07:19 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-12-16 21:02:24 +0000 |
| commit | 0af7e4dff50454905092d468e91c1ef92e10e6b4 (patch) | |
| tree | 6c1c9542720c6cf3b6de7a9ac6e8216ba55aebbc /drivers/gpu/drm/i915/i915_drv.c | |
| parent | d8c58fabd75021cdd99abcd96513cb088d41092b (diff) | |
| download | lwn-0af7e4dff50454905092d468e91c1ef92e10e6b4.tar.gz lwn-0af7e4dff50454905092d468e91c1ef92e10e6b4.zip | |
drm/i915: Add support for precise vblank timestamping (v2)
v2: Change IS_IRONLAKE to IS_GEN5 to adapt to 2.6.37
This patch adds new functions for use by the drm core:
.get_vblank_timestamp() provides a precise timestamp
for the end of the most recent (or current) vblank
interval of a given crtc, as needed for the DRI2
implementation of the OML_sync_control extension.
It is a thin wrapper around the drm function
drm_calc_vbltimestamp_from_scanoutpos() which does
almost all the work.
.get_scanout_position() provides the current horizontal
and vertical video scanout position and "in vblank"
status of a given crtc, as needed by the drm for use by
drm_calc_vbltimestamp_from_scanoutpos().
The patch modifies the pageflip completion routine
to use these precise vblank timestamps as the timestamps
for pageflip completion events.
This code has been only tested on a HP-Mini Netbook with
Atom processor and Intel 945GME gpu. The codepath for
(IS_G4X(dev) || IS_GEN5(dev) || IS_GEN6(dev)) gpu's
has not been tested so far due to lack of hardware.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index bdb29b2a01ed..9eee6cf7901e 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -652,6 +652,8 @@ static struct drm_driver driver = { .device_is_agp = i915_driver_device_is_agp, .enable_vblank = i915_enable_vblank, .disable_vblank = i915_disable_vblank, + .get_vblank_timestamp = i915_get_vblank_timestamp, + .get_scanout_position = i915_get_crtc_scanoutpos, .irq_preinstall = i915_driver_irq_preinstall, .irq_postinstall = i915_driver_irq_postinstall, .irq_uninstall = i915_driver_irq_uninstall, |