panfrost: Disable QUADS on Valhall

Even with the fixes in the rest of the series, arb-provoking-vertex-render is
still failing on Valhall for a single subcase (involving QUADS). It seems likely
that QUADS support is broken on Valhall, given it's not used in any of the APIs
for which Arm ships drivers.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17068>

src/gallium/drivers/panfrost/pan_screen.c

@@ -325,6 +325,14 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
                         modes |= BITFIELD_BIT(PIPE_PRIM_POLYGON);
                 }
 
+                if (dev->arch >= 9) {
+                        /* Although Valhall is supposed to support quads, they
+                         * don't seem to work correctly. Disable to fix
+                         * arb-provoking-vertex-render.
+                         */
+                        modes &= ~BITFIELD_BIT(PIPE_PRIM_QUADS);
+                }
+
                 return modes;
         }