etnaviv: warn when imported TS buffer is the same as color buffer

Color and TS buffers are allocated separately for each etnaviv resource, so
getting the same base and TS buffer at import time is unexpected and a strong
hint at the application doing something wrong, like passing in the same GEM
handle for all planes on a GBM import. Print a warning to give the user some
feedback.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9780>

src/gallium/drivers/etnaviv/etnaviv_resource.c

@@ -601,6 +601,10 @@ static void etna_resource_finish_ts_import(struct etna_screen *screen,
    uint64_t ts_modifier = rsc->modifier & VIVANTE_MOD_TS_MASK;
    uint8_t ts_mode = 0;
 
+   if (ts_rsc->bo == rsc->bo)
+      fprintf(stderr, "etnaviv: application bug: importing shared TS resource "
+              "with TS BO matching color BO, expect rendering corruption!\n");
+
    if (ts_modifier == VIVANTE_MOD_TS_256_4)
       ts_mode = TS_MODE_256B;