[Mesa-stable] [PATCH] r600g: write all MRTs only if there is exactly one output (fixes a hang)

[Marek Olšák]

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

This fixes a hang in
piglit/arb_blend_func_extended-fbo-extended-blend-pattern_gles2 on REDWOOD.

Cc: 11.0 <mesa-stable at lists.freedesktop.org>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
(cherry-picked from commit b5b87c4ed1dfd58aec8905e0514c9ba92ba83e1d)

Conflicts:
	src/gallium/drivers/r600/r600_shader.c
---
 src/gallium/drivers/r600/r600_shader.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index b345f14..911e81f 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -2109,7 +2109,9 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 
 	ctx.nliterals = 0;
 	ctx.literals = NULL;
-	shader->fs_write_all = FALSE;
+
+	shader->fs_write_all = ctx.info.properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS] &&
+			       ctx.info.colors_written == 1;
 
 	if (shader->vs_as_gs_a)
 		vs_add_primid_output(&ctx, key.vs.prim_id_out);
@@ -2140,10 +2142,6 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 		case TGSI_TOKEN_TYPE_PROPERTY:
 			property = &ctx.parse.FullToken.FullProperty;
 			switch (property->Property.PropertyName) {
-			case TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS:
-				if (property->u[0].Data == 1)
-					shader->fs_write_all = TRUE;
-				break;
 			case TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION:
 				if (property->u[0].Data == 1)
 					shader->vs_position_window_space = TRUE;
-- 
2.1.4