summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_vblank.c
diff options
context:
space:
mode:
authorMaxime Ripard <maxime@cerno.tech>2021-05-11 13:35:52 +0200
committerMaxime Ripard <maxime@cerno.tech>2021-05-11 13:35:52 +0200
commitc55b44c9386f3ee1b08752638559f19deaf6040d (patch)
treec843a21f45180387fcd9eb2625cc9d1f166a3156 /drivers/gpu/drm/drm_vblank.c
parentMAINTAINERS: Update my e-mail (diff)
parentLinux 5.13-rc1 (diff)
downloadlinux-c55b44c9386f3ee1b08752638559f19deaf6040d.tar.xz
linux-c55b44c9386f3ee1b08752638559f19deaf6040d.zip
Merge drm/drm-fixes into drm-misc-fixes
Start this new release drm-misc-fixes branch Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Diffstat (limited to 'drivers/gpu/drm/drm_vblank.c')
-rw-r--r--drivers/gpu/drm/drm_vblank.c28
1 files changed, 12 insertions, 16 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 893165eeddf3..3417e1ac7918 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -1470,20 +1470,7 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc)
}
EXPORT_SYMBOL(drm_crtc_vblank_on);
-/**
- * drm_vblank_restore - estimate missed vblanks and update vblank count.
- * @dev: DRM device
- * @pipe: CRTC index
- *
- * Power manamement features can cause frame counter resets between vblank
- * disable and enable. Drivers can use this function in their
- * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since
- * the last &drm_crtc_funcs.disable_vblank using timestamps and update the
- * vblank counter.
- *
- * This function is the legacy version of drm_crtc_vblank_restore().
- */
-void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
+static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
{
ktime_t t_vblank;
struct drm_vblank_crtc *vblank;
@@ -1491,6 +1478,7 @@ void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
u64 diff_ns;
u32 cur_vblank, diff = 1;
int count = DRM_TIMESTAMP_MAXRETRIES;
+ u32 max_vblank_count = drm_max_vblank_count(dev, pipe);
if (drm_WARN_ON(dev, pipe >= dev->num_crtcs))
return;
@@ -1517,9 +1505,8 @@ void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
drm_dbg_vbl(dev,
"missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n",
diff, diff_ns, framedur_ns, cur_vblank - vblank->last);
- store_vblank(dev, pipe, diff, t_vblank, cur_vblank);
+ vblank->last = (cur_vblank - diff) & max_vblank_count;
}
-EXPORT_SYMBOL(drm_vblank_restore);
/**
* drm_crtc_vblank_restore - estimate missed vblanks and update vblank count.
@@ -1530,9 +1517,18 @@ EXPORT_SYMBOL(drm_vblank_restore);
* &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since
* the last &drm_crtc_funcs.disable_vblank using timestamps and update the
* vblank counter.
+ *
+ * Note that drivers must have race-free high-precision timestamping support,
+ * i.e. &drm_crtc_funcs.get_vblank_timestamp must be hooked up and
+ * &drm_driver.vblank_disable_immediate must be set to indicate the
+ * time-stamping functions are race-free against vblank hardware counter
+ * increments.
*/
void drm_crtc_vblank_restore(struct drm_crtc *crtc)
{
+ WARN_ON_ONCE(!crtc->funcs->get_vblank_timestamp);
+ WARN_ON_ONCE(!crtc->dev->vblank_disable_immediate);
+
drm_vblank_restore(crtc->dev, drm_crtc_index(crtc));
}
EXPORT_SYMBOL(drm_crtc_vblank_restore);