panfrost: Enable PIPE_SHADER_CAP_FP16 on Bifrost

We don't have fp16 implemented on Midgard yet but on Bifrost we can flip
it on now.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4382>

src/gallium/drivers/panfrost/pan_screen.c

@@ -286,6 +286,7 @@ panfrost_get_shader_param(struct pipe_screen *screen,
                           enum pipe_shader_cap param)
 {
         bool is_deqp = pan_debug & PAN_DBG_DEQP;
+        struct panfrost_device *dev = pan_device(screen);
 
         if (shader != PIPE_SHADER_VERTEX &&
             shader != PIPE_SHADER_FRAGMENT &&
@@ -341,8 +342,10 @@ panfrost_get_shader_param(struct pipe_screen *screen,
         case PIPE_SHADER_CAP_INTEGERS:
                 return 1;
 
-        case PIPE_SHADER_CAP_INT64_ATOMICS:
         case PIPE_SHADER_CAP_FP16:
+                return !(dev->quirks & MIDGARD_BROKEN_FP16);
+
+        case PIPE_SHADER_CAP_INT64_ATOMICS:
         case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_LDEXP_SUPPORTED:

src/panfrost/include/panfrost-quirks.h

@@ -39,9 +39,14 @@
 
 #define MIDGARD_SFBD (1 << 1)
 
+/* Whether fp16 is broken in the compiler. Hopefully this quirk will go away
+ * over time */
+
+#define MIDGARD_BROKEN_FP16 (1 << 2)
+
 /* Quirk collections common to particular uarchs */
 
-#define MIDGARD_QUIRKS (0)
+#define MIDGARD_QUIRKS (MIDGARD_BROKEN_FP16)
 
 #define BIFROST_QUIRKS (0)