Mesa (staging/18.1): r600: reduce num compute threads to 1024.

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Module: Mesa
Branch: staging/18.1
Commit: 8e49c2ebc186c0c43236c6c5f1a0d54e5fcdb17c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8e49c2ebc186c0c43236c6c5f1a0d54e5fcdb17c

Author: Dave Airlie <airlied at redhat.com>
Date:   Wed Jul 25 13:14:58 2018 +1000

r600: reduce num compute threads to 1024.

I copied this value from radeonsi, but it was wrong, 1024
seems to be correct answer from looking at gpuinfo.

This should fix a few compute shader related hangs. (at least in CTS)

Cc: <mesa-stable at lists.freedesktop.org>
(airlied: pushed because it avoids hangs)

(cherry picked from commit 9039cf70fa0b785f390c649486e12d6c10e9142b)

---

 src/gallium/drivers/r600/r600_pipe_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r600/r600_pipe_common.c b/src/gallium/drivers/r600/r600_pipe_common.c
index 255a1e01b7..2a05e44199 100644
--- a/src/gallium/drivers/r600/r600_pipe_common.c
+++ b/src/gallium/drivers/r600/r600_pipe_common.c
@@ -996,7 +996,7 @@ static unsigned get_max_threads_per_block(struct r600_common_screen *screen,
 	if (ir_type != PIPE_SHADER_IR_TGSI)
 		return 256;
 	if (screen->chip_class >= EVERGREEN)
-		return 2048;
+		return 1024;
 	return 256;
 }