lima: optinal flush submit in lima_clear

flush current submit only when there is any draw pending instead of
flush all submits.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3755>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/gallium/drivers/lima/lima_draw.c b/src/gallium/drivers/lima/lima_draw.c
index 0b1e1f763c8..3b53bdac1d3 100644
--- a/src/gallium/drivers/lima/lima_draw.c
+++ b/src/gallium/drivers/lima/lima_draw.c
@@ -102,8 +102,14 @@ lima_clear(struct pipe_context *pctx, unsigned buffers,
            const union pipe_color_union *color, double depth, unsigned stencil)
 {
    struct lima_context *ctx = lima_context(pctx);
+   struct lima_submit *submit = lima_submit_get(ctx);
 
-   lima_flush(ctx);
+   /* flush if this submit already contains any draw, otherwise multi clear can be
+    * combined into a single submit */
+   if (lima_submit_has_draw_pending(submit)) {
+      lima_do_submit(submit);
+      submit = lima_submit_get(ctx);
+   }
 
    lima_update_submit_wb(ctx, buffers);
 
@@ -113,7 +119,6 @@ lima_clear(struct pipe_context *pctx, unsigned buffers,
       surf->reload = false;
    }
 
-   struct lima_submit *submit = lima_submit_get(ctx);
    struct lima_submit_clear *clear = &submit->clear;
    clear->buffers = buffers;