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| author | Dave Airlie <airlied@redhat.com> | 2020-02-20 15:21:02 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2020-02-21 05:44:40 +1000 |
| commit | 1b245ec5b685ebf8e6e5d1e6b5bcc03b6608e8b0 (patch) | |
| tree | 07cfbfb9b12a0d5a3f5c892115ac9a06104559af /drivers/gpu/drm/drm_vblank.c | |
| parent | 11a48a5a18c63fd7621bb050228cebf13566e4d8 (diff) | |
| parent | 06f749af622ca28c4e1f60c43fabd3917114f95a (diff) | |
| download | kernel_replicant_linux-1b245ec5b685ebf8e6e5d1e6b5bcc03b6608e8b0.tar.gz kernel_replicant_linux-1b245ec5b685ebf8e6e5d1e6b5bcc03b6608e8b0.tar.bz2 kernel_replicant_linux-1b245ec5b685ebf8e6e5d1e6b5bcc03b6608e8b0.zip | |
Merge tag 'drm-misc-next-2020-02-10' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
drm-misc-next for 5.7:
UAPI Changes:
- lima: Add support for heap buffers
Cross-subsystem Changes:
Core Changes:
- Implement mode_config mode_valid for memory constrained drivers
- Bus format negociation between bridges
- Consolidate fake vblank events for drivers without vblank interrupts
- drm/bufs: dma_alloc related cleanups
- drm/dp_mst: Various fixes
- drm/print: New drm_device based print helpers
- Thomas is a drm-misc maintainer now!
Driver Changes:
- DPMS cleanups for atomic drivers
- Removal of owner field in SPI tinydrm drivers
- Removal of explicit dependency on DT for tinydrm drivers
- Conversion to YAML schemas for DT bindings
- tidss: New driver
- virtio: various reworks and fixes
- Our usual dozen or so new panels or bridges
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200210093421.xu4sofldm6wm6xq6@gilmour.lan
Diffstat (limited to 'drivers/gpu/drm/drm_vblank.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index 1659b13b178c..27a99c486f02 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -69,6 +69,12 @@ * &drm_driver.max_vblank_count. In that case the vblank core only disables the * vblanks after a timer has expired, which can be configured through the * ``vblankoffdelay`` module parameter. + * + * Drivers for hardware without support for vertical-blanking interrupts + * must not call drm_vblank_init(). For such drivers, atomic helpers will + * automatically generate fake vblank events as part of the display update. + * This functionality also can be controlled by the driver by enabling and + * disabling struct drm_crtc_state.no_vblank. */ /* Retry timestamp calculation up to 3 times to satisfy @@ -502,6 +508,28 @@ err: EXPORT_SYMBOL(drm_vblank_init); /** + * drm_dev_has_vblank - test if vblanking has been initialized for + * a device + * @dev: the device + * + * Drivers may call this function to test if vblank support is + * initialized for a device. For most hardware this means that vblanking + * can also be enabled. + * + * Atomic helpers use this function to initialize + * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). + * + * Returns: + * True if vblanking has been initialized for the given device, false + * otherwise. + */ +bool drm_dev_has_vblank(const struct drm_device *dev) +{ + return dev->num_crtcs != 0; +} +EXPORT_SYMBOL(drm_dev_has_vblank); + +/** * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC * @crtc: which CRTC's vblank waitqueue to retrieve * |