On Fri, 28 Aug 2026 21:56:54 +0100 Adrián Larumbe <[email protected]> wrote:
> If the GPU and CPU are fully coherent, then there's no need to flush the > GPU caches after a perfcnt sample is made available. > > Signed-off-by: Adrián Larumbe <[email protected]> > --- > drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c > b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c > index ffc77121070e..b3f71d7fd82a 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c > +++ b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c > @@ -52,7 +52,10 @@ void panfrost_perfcnt_clean_cache_done(struct > panfrost_device *pfdev) > > void panfrost_perfcnt_sample_done(struct panfrost_device *pfdev) > { > - gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_CACHES); > + if (pfdev->features.selected_coherency != COHERENCY_ACE) I think ACE_LITE would allow us to skip the flush to, so if (pfdev->features.selected_coherency == COHERENCY_NONE) > + gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_CACHES); > + else > + complete(&pfdev->perfcnt->dump_comp); > } > > static int panfrost_perfcnt_dump_locked(struct panfrost_device *pfdev) >
