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drm/vc4: Flush the caches before the bin jobs, as well.

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If the frame samples from a render target that was just written, its
cache flush during the binning step may have occurred before the
previous frame's RCL was completed.  Flush the texture caches again
before starting each RCL job to make sure that the sampling of the
previous RCL's output is correct.

Fixes flickering in the top left of 3DMMES Taiji.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: ca26d28bba ("drm/vc4: improve throughput by pipelining binning and rendering jobs")
Link: https://patchwork.freedesktop.org/patch/msgid/20171221221722.23809-1-eric@anholt.net
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Eric Anholt 2017-12-21 14:17:22 -08:00
parent 75f195f46f
commit f61145f1a4
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/vc4/vc4_gem.c
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@ -436,6 +436,19 @@ vc4_flush_caches(struct drm_device *dev)
VC4_SET_FIELD(0xf, V3D_SLCACTL_ICC));
}
static void
vc4_flush_texture_caches(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
V3D_WRITE(V3D_L2CACTL,
V3D_L2CACTL_L2CCLR);
V3D_WRITE(V3D_SLCACTL,
VC4_SET_FIELD(0xf, V3D_SLCACTL_T1CC) |
VC4_SET_FIELD(0xf, V3D_SLCACTL_T0CC));
}
/* Sets the registers for the next job to be actually be executed in
* the hardware.
*
@ -474,6 +487,14 @@ vc4_submit_next_render_job(struct drm_device *dev)
if (!exec)
return;
/* A previous RCL may have written to one of our textures, and
* our full cache flush at bin time may have occurred before
* that RCL completed. Flush the texture cache now, but not
* the instructions or uniforms (since we don't write those
* from an RCL).
*/
vc4_flush_texture_caches(dev);
submit_cl(dev, 1, exec->ct1ca, exec->ct1ea);
}