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r600g: don't enable ReZ mode on evergreen 

Can cause lockups in certain cases when
zfunc/zenable/zwrite change without a flush
in between.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=60969
and lockups on Civ4 with wine.

This is a candidate for the 9.1 branch.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
This commit is contained in:
Alex Deucher 2013-02-20 16:11:52 -05:00
parent f7d87332b0
commit 2e4ef989a2
1 changed files with 4 additions and 1 deletions
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5
src/gallium/drivers/r600/evergreen_state.c
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@ -3536,9 +3536,12 @@ void evergreen_update_db_shader_control(struct r600_context * rctx)
* write to the zbuffer. Write to zbuffer is delayed after fragment shader
* execution and thus after alpha test so if discarded by the alpha test
* the z value is not written.
* If ReZ is enabled, and the zfunc/zenable/zwrite values change you can
* get a hang unless you flush the DB in between. For now just use
* LATE_Z.
*/
if (rctx->alphatest_state.sx_alpha_test_control) {
db_shader_control |= S_02880C_Z_ORDER(V_02880C_RE_Z);
db_shader_control |= S_02880C_Z_ORDER(V_02880C_LATE_Z);
} else {
db_shader_control |= S_02880C_Z_ORDER(V_02880C_EARLY_Z_THEN_LATE_Z);
}