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| author | Eric Anholt <eric@anholt.net> | 2018-12-03 14:24:36 -0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2018-12-07 10:56:25 -0800 |
| commit | 51c1b6f9eb3dbdec91b0e3c89f623e634c996bbb (patch) | |
| tree | e92e340923c9bb7541c3efc11cce7cce27116cee | |
| parent | 2e6dc3bd80478212e84addf1cafd6ec60674b884 (diff) | |
| download | linux-51c1b6f9eb3dbdec91b0e3c89f623e634c996bbb.tar.bz2 | |
drm/v3d: Drop the wait for L2T flush to complete.
According to Dave, once you've started an L2T flush, all L2T accesses
will be blocked until the flush completes. This fixes a consistent
3-4ms stall between the ioctl and running the job, and 3DMMES Taiji
goes from 27fps to 110fps.
v2: Leave a note about why we don't need to wait for completion.
Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Reviewed-by: Dave Emett <david.emett@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-4-eric@anholt.net
| -rw-r--r-- | drivers/gpu/drm/v3d/v3d_gem.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c index f82c1ccfaeed..2b378de23fbd 100644 --- a/drivers/gpu/drm/v3d/v3d_gem.c +++ b/drivers/gpu/drm/v3d/v3d_gem.c @@ -143,13 +143,13 @@ v3d_invalidate_l2(struct v3d_dev *v3d, int core) static void v3d_flush_l2t(struct v3d_dev *v3d, int core) { + /* While there is a busy bit (V3D_L2TCACTL_L2TFLS), we don't + * need to wait for completion before dispatching the job -- + * L2T accesses will be stalled until the flush has completed. + */ V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL, V3D_L2TCACTL_L2TFLS | V3D_SET_FIELD(V3D_L2TCACTL_FLM_FLUSH, V3D_L2TCACTL_FLM)); - if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) & - V3D_L2TCACTL_L2TFLS), 100)) { - DRM_ERROR("Timeout waiting for L2T flush\n"); - } } /* Invalidates the slice caches. These are read-only caches. */ |