Enable it directly in the preamble, but do not enable line
on Polaris10/11/12 because there is a hw bug.

There is possibly an issue when MSAA is off, but this doesn't
regress any CTS and AMDVLK doesn't have a workaround as well.

Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
 src/amd/vulkan/si_cmd_buffer.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/amd/vulkan/si_cmd_buffer.c b/src/amd/vulkan/si_cmd_buffer.c
index 0970eff103..aed291be35 100644
--- a/src/amd/vulkan/si_cmd_buffer.c
+++ b/src/amd/vulkan/si_cmd_buffer.c
@@ -539,6 +539,21 @@ si_emit_config(struct radv_physical_device 
*physical_device,
                                       S_028004_ZPASS_INCREMENT_DISABLE(1));
        }
 
+       /* Enable the Polaris small primitive filter control.
+        * XXX: There is possibly an issue when MSAA is off (see RadeonSI
+        * has_msaa_sample_loc_bug). But this doesn't seem to regress anything,
+        * and AMDVLK doesn't have a workaround as well.
+        */
+       if (physical_device->rad_info.family >= CHIP_POLARIS10) {
+               unsigned small_prim_filter_cntl =
+                       S_028830_SMALL_PRIM_FILTER_ENABLE(1) |
+                       /* Workaround for a hw line bug. */
+                       
S_028830_LINE_FILTER_DISABLE(physical_device->rad_info.family <= 
CHIP_POLARIS12);
+
+               radeon_set_context_reg(cs, 
R_028830_PA_SU_SMALL_PRIM_FILTER_CNTL,
+                                      small_prim_filter_cntl);
+       }
+
        si_emit_compute(physical_device, cs);
 }
 
-- 
2.16.3

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