ARC: [plat-eznps] disabled stall counter due to a HW bug

This counter represents threshold for consecutive stall which
would trigger HW threads scheduling. However when enabled, low
threshhold values cause performance degradation and in the
worst case even livelock.

So disable it by resorting to HW reset value

Signed-off-by: Noam Camus <noamca@mellanox.com>
Reviewed-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: fixed changelog]

diff --git a/arch/arc/plat-eznps/mtm.c b/arch/arc/plat-eznps/mtm.c
index aaaaffd3d94052fbbbd65da8b7eb509b72eb01d5..e0cb36b03d2e42d391d548223933ffdf5efbdbdc 100644 (file)
--- a/arch/arc/plat-eznps/mtm.c
+++ b/arch/arc/plat-eznps/mtm.c
@@ -119,8 +119,6 @@ void mtm_enable_core(unsigned int cpu)
        mt_ctrl.value = 0;
        mt_ctrl.hsen = 1;
        mt_ctrl.hs_cnt = MT_CTRL_HS_CNT;
-       mt_ctrl.sten = 1;
-       mt_ctrl.st_cnt = MT_CTRL_ST_CNT;
        mt_ctrl.mten = 1;
        write_aux_reg(CTOP_AUX_MT_CTRL, mt_ctrl.value);