radeonsi: really wait for the second EOP event and not the first one

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_perfcounter.c b/src/gallium/drivers/radeonsi/si_perfcounter.c
index 96007a5..0ced617 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_perfcounter.c
+++ b/src/gallium/drivers/radeonsi/si_perfcounter.c
@@ -595,16 +595,19 @@ static void si_pc_emit_stop(struct r600_common_context *ctx,
                /* Two EOP events are required to make all engines go idle
                 * (and optional cache flushes executed) before the timestamp
                 * is written.
+                *
+                * Write 1, because we need to wait for the second EOP event.
                 */
                radeon_emit(cs, PKT3(PKT3_EVENT_WRITE_EOP, 4, 0));
                radeon_emit(cs, EVENT_TYPE(EVENT_TYPE_BOTTOM_OF_PIPE_TS) |
                                EVENT_INDEX(5));
                radeon_emit(cs, va);
                radeon_emit(cs, (va >> 32) | EOP_DATA_SEL(1));
-               radeon_emit(cs, 0); /* immediate data */
+               radeon_emit(cs, 1); /* immediate data */
                radeon_emit(cs, 0); /* unused */
        }
 
+       /* Write 0. */
        radeon_emit(cs, PKT3(PKT3_EVENT_WRITE_EOP, 4, 0));
        radeon_emit(cs, EVENT_TYPE(EVENT_TYPE_BOTTOM_OF_PIPE_TS) |
                        EVENT_INDEX(5));
@@ -613,6 +616,7 @@ static void si_pc_emit_stop(struct r600_common_context *ctx,
        radeon_emit(cs, 0); /* immediate data */
        radeon_emit(cs, 0); /* unused */
 
+       /* Wait until the memory location is 0. */
        radeon_emit(cs, PKT3(PKT3_WAIT_REG_MEM, 5, 0));
        radeon_emit(cs, WAIT_REG_MEM_EQUAL | WAIT_REG_MEM_MEM_SPACE(1));
        radeon_emit(cs, va);