netdev - Re: [PATCH v2] ptp_qoriq: fix latency in ptp_qoriq

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Date:   Sat, 21 Jan 2023 03:00:18 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Nikhil Gupta <nikhil.gupta@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, yangbo.lu@....com,
        vladimir.oltean@....com, richardcochran@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        vakul.garg@....com, rajan.gupta@....com
Subject: Re: [PATCH v2] ptp_qoriq: fix latency in ptp_qoriq_adjtime() operation

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Fri, 20 Jan 2023 02:10:34 +0530 you wrote:
> From: Nikhil Gupta <nikhil.gupta@....com>
> 
> 1588 driver loses about 1us in adjtime operation at PTP slave
> This is because adjtime operation uses a slow non-atomic tmr_cnt_read()
> followed by tmr_cnt_write() operation.
> 
> In the above sequence, since the timer counter operation keeps
> incrementing, it leads to latency. The tmr_offset register
> (which is added to TMR_CNT_H/L register giving the current time)
> must be programmed with the delta nanoseconds.
> 
> [...]

Here is the summary with links:
  - [v2] ptp_qoriq: fix latency in ptp_qoriq_adjtime() operation
    https://git.kernel.org/netdev/net-next/c/24a7fffb2533

You are awesome, thank you!
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