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| author |   Elad Kanfi <eladkan@mellanox.com> | 2017-06-15 11:44:01 +0300 |
|---|---|---|
| committer |   Vineet Gupta <vgupta@synopsys.com> | 2017-08-28 15:17:36 -0700 |
| commit | 3f9cd874dcc8705b53c03431f0ae46c94e572349 (patch) | |
| tree | b5a20f147f53b46dc3fd9e6f39f10686dceac152 /arch/arc/plat-eznps/mtm.c | |
| parent | ARC: [plat-eznps] Update the init sequence of aux regs per cpu. (diff) | |
| download | linux-dev-3f9cd874dcc8705b53c03431f0ae46c94e572349.tar.xz linux-dev-3f9cd874dcc8705b53c03431f0ae46c94e572349.zip | |
ARC: [plat-eznps] avoid toggling of DPC register
HW bug description: in case of HW thread context switch
the dpc configuration of the exiting thread is dragged
one cycle into the next thread.
In order to avoid the consequences of this bug, the DPC register
is set to an initial value, and not changed afterwards.
Signed-off-by: Elad Kanfi <eladkan@mellanox.com>
Signed-off-by: Noam Camus <noamca@mellanox.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/arc/plat-eznps/mtm.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arc/plat-eznps/mtm.c b/arch/arc/plat-eznps/mtm.c index 8a13f0ac49fb..2388de3d09ef 100644 --- a/arch/arc/plat-eznps/mtm.c +++ b/arch/arc/plat-eznps/mtm.c @@ -110,6 +110,18 @@ void mtm_enable_core(unsigned int cpu) int i; struct nps_host_reg_aux_mt_ctrl mt_ctrl; struct nps_host_reg_mtm_cfg mtm_cfg; + struct nps_host_reg_aux_dpc dpc; + + /* + * Initializing dpc register in each CPU. + * Overwriting the init value of the DPC + * register so that CMEM and FMT virtual address + * spaces are accessible, and Data Plane HW + * facilities are enabled. + */ + dpc.ien = 1; + dpc.men = 1; + write_aux_reg(CTOP_AUX_DPC, dpc.value); if (NPS_CPU_TO_THREAD_NUM(cpu) != 0) return; |