etnaviv: add debug switch to disable single buffer feature

This feature has caused some trouble already. Add a debug switch to
allow users to quickly check if a specific issue is caused by this
feature.

Signed-off-by: Lucas Stach <[email protected]>
Reviewed-by: Christian Gmeiner <[email protected]>

2 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_debug.h b/src/gallium/drivers/etnaviv/etnaviv_debug.h
index f47dffe5900..4051e95dd5f 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_debug.h
+++ b/src/gallium/drivers/etnaviv/etnaviv_debug.h
@@ -52,6 +52,7 @@
 #define ETNA_DBG_ZERO            0x200000 /* Zero all resources after allocation */
 #define ETNA_DBG_DRAW_STALL      0x400000 /* Stall FE/PE after every draw op */
 #define ETNA_DBG_SHADERDB        0x800000 /* dump program compile information */
+#define ETNA_DBG_NO_SINGLEBUF    0x1000000 /* disable single buffer feature */
 
 extern int etna_mesa_debug; /* set in etna_screen.c from ETNA_DEBUG */
 
diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index 3dd628bd9b4..f589bd44eaf 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -68,6 +68,7 @@ static const struct debug_named_value debug_options[] = {
    {"zero",           ETNA_DBG_ZERO, "Zero all resources after allocation"},
    {"draw_stall",     ETNA_DBG_DRAW_STALL, "Stall FE/PE after each rendered primitive"},
    {"shaderdb",       ETNA_DBG_SHADERDB, "Enable shaderdb output"},
+   {"no_singlebuffer",ETNA_DBG_NO_SINGLEBUF, "Disable single buffer feature"},
    DEBUG_NAMED_VALUE_END
 };
 
@@ -963,6 +964,8 @@ etna_screen_create(struct etna_device *dev, struct etna_gpu *gpu,
       screen->features[viv_chipMinorFeatures1] &= ~chipMinorFeatures1_AUTO_DISABLE;
    if (DBG_ENABLED(ETNA_DBG_NO_SUPERTILE))
       screen->specs.can_supertile = 0;
+   if (DBG_ENABLED(ETNA_DBG_NO_SINGLEBUF))
+      screen->specs.single_buffer = 0;
 
    pscreen->destroy = etna_screen_destroy;
    pscreen->get_param = etna_screen_get_param;