freedreno/a5xx: fix random faults on first sysmem draw

Not sure what this event is, but blob writes it.. and it seems to solve
random write faults at mystery address that would sometimes happen on
first BYPASS draw.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/src/gallium/drivers/freedreno/a5xx/fd5_gmem.c b/src/gallium/drivers/freedreno/a5xx/fd5_gmem.c
index cf1cd76fea8f692752cc008f0d90464743366253..775d5b9cb224255f6a39f4aafd340845c34efd24 100644 (file)
--- a/src/gallium/drivers/freedreno/a5xx/fd5_gmem.c
+++ b/src/gallium/drivers/freedreno/a5xx/fd5_gmem.c
@@ -485,6 +485,9 @@ fd5_emit_sysmem_prep(struct fd_batch *batch)
        OUT_PKT7(ring, CP_SKIP_IB2_ENABLE_GLOBAL, 1);
        OUT_RING(ring, 0x0);
 
+       OUT_PKT7(ring, CP_EVENT_WRITE, 1);
+       OUT_RING(ring, UNK_19);
+
        OUT_PKT4(ring, REG_A5XX_PC_POWER_CNTL, 1);
        OUT_RING(ring, 0x00000003);   /* PC_POWER_CNTL */