radeonsi: set an optimal value for DB_Z_INFO.ZRANGE_PRECISION

Required because of a VI hw bug.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index f24cbbd..dc19d29 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -1948,12 +1948,6 @@ static void si_init_depth_surface(struct si_context *sctx,
                z_info |= S_028040_TILE_SURFACE_ENABLE(1) |
                          S_028040_ALLOW_EXPCLEAR(1);
 
-               /* This is optimal for the clear value of 1.0 and using
-                * the LESS and LEQUAL test functions. Set this to 0
-                * for the opposite case. This can only be changed when
-                * clearing. */
-               z_info |= S_028040_ZRANGE_PRECISION(1);
-
                /* Use all of the htile_buffer for depth, because we don't
                 * use HTILE for stencil because of FAST_STENCIL_DISABLE. */
                s_info |= S_028044_TILE_STENCIL_DISABLE(1);
@@ -2183,7 +2177,8 @@ static void si_emit_framebuffer_state(struct si_context *sctx, struct r600_atom
 
                r600_write_context_reg_seq(cs, R_02803C_DB_DEPTH_INFO, 9);
                radeon_emit(cs, zb->db_depth_info);     /* R_02803C_DB_DEPTH_INFO */
-               radeon_emit(cs, zb->db_z_info);         /* R_028040_DB_Z_INFO */
+               radeon_emit(cs, zb->db_z_info |         /* R_028040_DB_Z_INFO */
+                           S_028040_ZRANGE_PRECISION(rtex->depth_clear_value != 0));
                radeon_emit(cs, zb->db_stencil_info);   /* R_028044_DB_STENCIL_INFO */
                radeon_emit(cs, zb->db_depth_base);     /* R_028048_DB_Z_READ_BASE */
                radeon_emit(cs, zb->db_stencil_base);   /* R_02804C_DB_STENCIL_READ_BASE */