diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-11-27 21:20:04 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-01-14 22:23:55 +0300 |
| commit | ed20151a7699bb2c77eba3610199789a126940c4 (patch) | |
| tree | 0f627cdb8cad46a5b9d620b7d4262b3b9a2d2cbc /include/drm/drm_device.h | |
| parent | e3de0aa6c9afdca053389a4721d6a7d65126dfb8 (diff) | |
| download | linux-ed20151a7699bb2c77eba3610199789a126940c4.tar.xz | |
drm/vblank: Allow dynamic per-crtc max_vblank_count
On i965gm we need to adjust max_vblank_count dynamically
depending on whether the TV encoder is used or not. To
that end add a per-crtc max_vblank_count that takes
precedence over its device wide counterpart. The driver
can now call drm_crtc_set_max_vblank_count() to configure
the per-crtc value before calling drm_vblank_on().
Also looks like there was some discussion about exynos needing
similar treatment.
v2: Drop the extra max_vblank_count!=0 check for the
WARN(last!=current), will take care of it in i915 code (Daniel)
WARN_ON(!inmodeset) (Daniel)
WARN_ON(dev->max_vblank_count)
Pimp up the docs (Daniel)
Cc: stable@vger.kernel.org
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181127182004.28885-1-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include/drm/drm_device.h')
| -rw-r--r-- | include/drm/drm_device.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h index a6f8e5abb66f..d5e092dccf3e 100644 --- a/include/drm/drm_device.h +++ b/include/drm/drm_device.h @@ -240,6 +240,12 @@ struct drm_device { * races and imprecision over longer time periods, hence exposing a * hardware vblank counter is always recommended. * + * This is the statically configured device wide maximum. The driver + * can instead choose to use a runtime configurable per-crtc value + * &drm_vblank_crtc.max_vblank_count, in which case @max_vblank_count + * must be left at zero. See drm_crtc_set_max_vblank_count() on how + * to use the per-crtc value. + * * If non-zero, &drm_crtc_funcs.get_vblank_counter must be set. */ u32 max_vblank_count; |