netdev - Re: [PATCH net] Revert "net/mlx5: Update cyclecounter shift value to improve ptp free running mode precision"

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Date: Wed, 16 Aug 2023 19:38:22 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Saeed Mahameed <saeedm@...dia.com>
Cc: Vadim Fedorenko <vadfed@...a.com>, Rahul Rameshbabu
 <rrameshbabu@...dia.com>, Gal Pressman <gal@...dia.com>, Bar Shapira
 <bshapira@...dia.com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>, Richard
 Cochran <richardcochran@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net] Revert "net/mlx5: Update cyclecounter shift value
 to improve ptp free running mode precision"

On Tue, 15 Aug 2023 08:15:07 -0700 Vadim Fedorenko wrote:
> From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
> 
> This reverts commit 6a40109275626267ebf413ceda81c64719b5c431.
> 
> There was an assumption in the original commit that all the devices
> supported by mlx5 advertise 1GHz as an internal timer frequency.
> Apparently at least ConnectX-4 Lx (MCX4431N-GCAN) provides 156.250Mhz
> as an internal frequency and the original commit breaks PTP
> synchronization on these cards.

Hi Saeed, any preference here? Given we're past -rc6 and the small
size of the revert it seems like a tempting solution?