radeonsi: fix a VGT hang with primitive restart on Polaris10 and later

Cc: 18.1 18.2 <mesa-stable@lists.freedesktop.org>
Tested-by: Jakob Bornecrantz <jakob@collabora.com>

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index 83eb646..612ca91 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -383,7 +383,7 @@ si_get_init_multi_vgt_param(struct si_screen *sscreen,
                 * Polaris supports primitive restart with WD_SWITCH_ON_EOP=0
                 * for points, line strips, and tri strips.
                 */
-               if (sscreen->info.max_se < 4 ||
+               if (sscreen->info.max_se <= 2 ||
                    key->u.prim == PIPE_PRIM_POLYGON ||
                    key->u.prim == PIPE_PRIM_LINE_LOOP ||
                    key->u.prim == PIPE_PRIM_TRIANGLE_FAN ||
@@ -414,7 +414,7 @@ si_get_init_multi_vgt_param(struct si_screen *sscreen,
                        wd_switch_on_eop = true;
 
                /* Required on CIK and later. */
-               if (sscreen->info.max_se > 2 && !wd_switch_on_eop)
+               if (sscreen->info.max_se == 4 && !wd_switch_on_eop)
                        ia_switch_on_eoi = true;
 
                /* Required by Hawaii and, for some special cases, by VI. */
@@ -429,6 +429,12 @@ si_get_init_multi_vgt_param(struct si_screen *sscreen,
                    key->u.uses_instancing)
                        partial_vs_wave = true;
 
+               /* This only applies to Polaris10 and later 4 SE chips.
+                * wd_switch_on_eop is already true on all other chips.
+                */
+               if (!wd_switch_on_eop && key->u.primitive_restart)
+                       partial_vs_wave = true;
+
                /* If the WD switch is false, the IA switch must be false too. */
                assert(wd_switch_on_eop || !ia_switch_on_eop);
        }