[Mesa-dev] [PATCH 2/4] radeonsi: use maximum OFFCHIP_BUFFERING on Vega12

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

---
 src/gallium/drivers/radeonsi/si_pipe.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index fa9ee43389a..1cc08c5feed 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -748,21 +748,28 @@ struct pipe_screen *radeonsi_screen_create(struct radeon_winsys *ws,
 	if (!debug_get_bool_option("RADEON_DISABLE_PERFCOUNTERS", false))
 		si_init_perfcounters(sscreen);
 
 	/* Determine tessellation ring info. */
 	bool double_offchip_buffers = sscreen->info.chip_class >= CIK &&
 				      sscreen->info.family != CHIP_CARRIZO &&
 				      sscreen->info.family != CHIP_STONEY;
 	/* This must be one less than the maximum number due to a hw limitation.
 	 * Various hardware bugs in SI, CIK, and GFX9 need this.
 	 */
-	unsigned max_offchip_buffers_per_se = double_offchip_buffers ? 127 : 63;
+	unsigned max_offchip_buffers_per_se;
+
+	/* Only certain chips can use the maximum value. */
+	if (sscreen->info.family == CHIP_VEGA12)
+		max_offchip_buffers_per_se = double_offchip_buffers ? 128 : 64;
+	else
+		max_offchip_buffers_per_se = double_offchip_buffers ? 127 : 63;
+
 	unsigned max_offchip_buffers = max_offchip_buffers_per_se *
 				       sscreen->info.max_se;
 	unsigned offchip_granularity;
 
 	/* Hawaii has a bug with offchip buffers > 256 that can be worked
 	 * around by setting 4K granularity.
 	 */
 	if (sscreen->info.family == CHIP_HAWAII) {
 		sscreen->tess_offchip_block_dw_size = 4096;
 		offchip_granularity = V_03093C_X_4K_DWORDS;
-- 
2.15.1