radv/gfx10: don't initialize VGT_INSTANCE_STEP_RATE_0

Only gfx9 and older use it to get InstanceID in VGPR1.
Ported from RadeonSI.

Cc: 19.2 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/amd/vulkan/si_cmd_buffer.c b/src/amd/vulkan/si_cmd_buffer.c
index e37b949..32674d3 100644 (file)
--- a/src/amd/vulkan/si_cmd_buffer.c
+++ b/src/amd/vulkan/si_cmd_buffer.c
@@ -192,7 +192,8 @@ si_emit_graphics(struct radv_physical_device *physical_device,
                radeon_set_context_reg(cs, R_028B98_VGT_STRMOUT_BUFFER_CONFIG, 0x0);
        }
 
-       radeon_set_context_reg(cs, R_028AA0_VGT_INSTANCE_STEP_RATE_0, 1);
+       if (physical_device->rad_info.chip_class <= GFX9)
+               radeon_set_context_reg(cs, R_028AA0_VGT_INSTANCE_STEP_RATE_0, 1);
        if (!physical_device->has_clear_state)
                radeon_set_context_reg(cs, R_028AB8_VGT_VTX_CNT_EN, 0x0);
        if (physical_device->rad_info.chip_class < GFX7)