panfrost: add pan_force_afbc_packing driconf

This is useful for forcing AFBC-P to be used in applications where it's
know to work well. This can significantly reduce memory consumption and
bandwidth, leading more applications working in the first place, and
also better performance.

Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27916>

src/gallium/drivers/panfrost/driinfo_panfrost.h

@@ -1 +1,4 @@
 /* panfrost specific driconf options */
+DRI_CONF_SECTION_PERFORMANCE
+   DRI_CONF_OPT_B(pan_force_afbc_packing, false, "Use AFBC-P for textures")
+DRI_CONF_SECTION_END

src/gallium/drivers/panfrost/pan_screen.c

@@ -857,6 +857,9 @@ panfrost_create_screen(int fd, const struct pipe_screen_config *config,
    }
 
    screen->force_afbc_packing = dev->debug & PAN_DBG_FORCE_PACK;
+   if (!screen->force_afbc_packing)
+      screen->force_afbc_packing = driQueryOptionb(config->options,
+                                                   "pan_force_afbc_packing");
 
    dev->ro = ro;