While I haven't seen us take too long in nv50_crc_ctx_flip_work() outside of
users with kernel logging on a serial port, it probably would be a good idea to
check how long we take just in case we need to go faster in the future.
Cc: Martin Peres <martin.peres@xxxxxxx>
Cc: Jeremy Cline <jcline@xxxxxxxxxx>
Cc: Simon Ser <contact@xxxxxxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/dispnv50/crc.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/crc.c b/drivers/gpu/drm/nouveau/dispnv50/crc.c
index 3c50b29a37ff..ef942248345c 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/crc.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/crc.c
@@ -86,6 +86,8 @@ static void nv50_crc_ctx_flip_work(struct kthread_work *base)
struct drm_crtc *crtc = &head->base.base;
struct drm_device *dev = crtc->dev;
struct nv50_disp *disp = nv50_disp(dev);
+ const uint64_t start_vbl = drm_crtc_vblank_count(crtc);
+ uint64_t end_vbl;
u8 new_idx = crc->ctx_idx ^ 1;
/*
@@ -94,9 +96,7 @@ static void nv50_crc_ctx_flip_work(struct kthread_work *base)
*/
if (!mutex_trylock(&disp->mutex)) {
drm_dbg_kms(dev, "Lock contended, delaying CRC ctx flip for %s\n", crtc->name);
- drm_vblank_work_schedule(work,
- drm_crtc_vblank_count(crtc) + 1,
- true);
+ drm_vblank_work_schedule(work, start_vbl + 1, true);
return;
}
@@ -107,6 +107,12 @@ static void nv50_crc_ctx_flip_work(struct kthread_work *base)
nv50_crc_program_ctx(head, &crc->ctx[new_idx]);
mutex_unlock(&disp->mutex);
+ end_vbl = drm_crtc_vblank_count(crtc);
+ if (unlikely(end_vbl != start_vbl))
+ NV_ERROR(nouveau_drm(dev),
+ "Failed to flip CRC context on %s on time (%llu > %llu)\n",
+ crtc->name, end_vbl, start_vbl);
+
spin_lock_irq(&crc->lock);
crc->ctx_changed = true;
spin_unlock_irq(&crc->lock);
--
2.29.2
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