Mesa (master): vc4: Make sure to emit a tile coordinates between two MSAA loads.

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Module: Mesa
Branch: master
Commit: 550e9c917c155b3fc4e7bd0b74ead90814f864d8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=550e9c917c155b3fc4e7bd0b74ead90814f864d8

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Aug  7 13:08:15 2018 -0700

vc4: Make sure to emit a tile coordinates between two MSAA loads.

The HW only executes a load once the tile coordinates packet happens, and
only tracks one at a time, so by emitting our two MSAA loads back to back
we would end up with an undefined color or Z buffer.  The simulator
doesn't seem to care, but sync up the RCL generation with the kernel
anyway.

Fixes dEQP-EGL.functional.render.multi_context.gles2.rgb888_window

---

 src/gallium/drivers/vc4/kernel/vc4_render_cl.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/gallium/drivers/vc4/kernel/vc4_render_cl.c b/src/gallium/drivers/vc4/kernel/vc4_render_cl.c
index 2da797899b..f03d0bf0db 100644
--- a/src/gallium/drivers/vc4/kernel/vc4_render_cl.c
+++ b/src/gallium/drivers/vc4/kernel/vc4_render_cl.c
@@ -141,6 +141,12 @@ static void emit_tile(struct vc4_exec_info *exec,
 	}
 
 	if (setup->zs_read) {
+		if (setup->color_read) {
+			/* Exec previous load. */
+			vc4_tile_coordinates(setup, x, y);
+			vc4_store_before_load(setup);
+		}
+
 		if (args->zs_read.flags &
 		    VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
 			rcl_u8(setup, VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER);
@@ -149,12 +155,6 @@ static void emit_tile(struct vc4_exec_info *exec,
 						    &args->zs_read, x, y) |
 				VC4_LOADSTORE_FULL_RES_DISABLE_COLOR);
 		} else {
-			if (setup->color_read) {
-				/* Exec previous load. */
-				vc4_tile_coordinates(setup, x, y);
-				vc4_store_before_load(setup);
-			}
-
 			rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
 			rcl_u16(setup, args->zs_read.bits);
 			rcl_u32(setup, setup->zs_read->paddr +
@@ -285,16 +285,15 @@ static int vc4_create_rcl_bo(struct drm_device *dev, struct vc4_exec_info *exec,
 		}
 	}
 	if (setup->zs_read) {
+		if (setup->color_read) {
+			loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
+			loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+		}
+
 		if (args->zs_read.flags &
 		    VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
 			loop_body_size += VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER_SIZE;
 		} else {
-			if (setup->color_read &&
-			    !(args->color_read.flags &
-			      VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES)) {
-				loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
-				loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
-			}
 			loop_body_size += VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE;
 		}
 	}