linux-kernel - Re: [PATCH v2 07/11] ARC: [plat-eznps] disabled stall counter due to a HW bug

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Date:   Mon, 29 May 2017 15:15:15 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "noamca@...lanox.com" <noamca@...lanox.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/11] ARC: [plat-eznps] disabled stall counter due
 to a HW bug

Hi Noam,

On Sun, 2017-05-28 at 09:52 +0300, Noam Camus wrote:
> From: Noam Camus <noamca@...lanox.com>
> 
> This counter represents threshold for consecutive stall that which
> trigger HW threads scheduling.
> When this feature is enabled low values of this counter cause
> downgrade in performance and in the worst case even a livelock.
> 
> Remove those couple of lines and resort to HW reset value i.e.
> this feature is disabled (.sten field equals 0).

Looks like you made a change I was asking for here.
But there's no mention of the change so it's easy to not note
that change. Not critical but please add a changelog next time 
even if it's only a comment message that was modified since
the previous revision.

Otherwise...

Reviewed-by: Alexey Brodkin <abrodkin@...opsys.com>

> Signed-off-by: Noam Camus <noamca@...lanox.com>
> ---
>  arch/arc/plat-eznps/mtm.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arc/plat-eznps/mtm.c b/arch/arc/plat-eznps/mtm.c
> index aaaaffd..e0cb36b 100644
> --- 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);
>