netdev - Re: [PATCH iwlwifi-fixes] wifi: iwlwifi: Implement settime64 as stub for MVM/MLD PTP

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Message-ID: <aTRFWCGHO-eU6_JV@horms.kernel.org>
Date: Sat, 6 Dec 2025 15:01:44 +0000
From: Simon Horman <horms@...nel.org>
To: Yao Zi <ziyao@...root.org>
Cc: Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Richard Cochran <richardcochran@...il.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Anjaneyulu <pagadala.yesu.anjaneyulu@...el.com>,
	Daniel Gabay <daniel.gabay@...el.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Mingcong Bai <jeffbai@...c.io>,
	Kexy Biscuit <kexybiscuit@...c.io>,
	Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH iwlwifi-fixes] wifi: iwlwifi: Implement settime64 as stub
 for MVM/MLD PTP

On Thu, Dec 04, 2025 at 12:32:04PM +0000, Yao Zi wrote:
> Since commit dfb073d32cac ("ptp: Return -EINVAL on ptp_clock_register if
> required ops are NULL"), PTP clock registered through ptp_clock_register
> is required to have ptp_clock_info.settime64 set, however, neither MVM
> nor MLD's PTP clock implementation sets it, resulting in warnings when
> the interface starts up, like
> 
> WARNING: drivers/ptp/ptp_clock.c:325 at ptp_clock_register+0x2c8/0x6b8, CPU#1: wpa_supplicant/469
> CPU: 1 UID: 0 PID: 469 Comm: wpa_supplicant Not tainted 6.18.0+ #101 PREEMPT(full)
> ra: ffff800002732cd4 iwl_mvm_ptp_init+0x114/0x188 [iwlmvm]
> ERA: 9000000002fdc468 ptp_clock_register+0x2c8/0x6b8
> iwlwifi 0000:01:00.0: Failed to register PHC clock (-22)
> 
> I don't find an appropriate firmware interface to implement settime64()
> for iwlwifi MLD/MVM, thus instead create a stub that returns
> -EOPTNOTSUPP only, suppressing the warning and allowing the PTP clock to
> be registered.
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Closes: https://lore.kernel.org/all/20251108044822.GA3262936@ax162/
> Signed-off-by: Yao Zi <ziyao@...root.org>

Reviewed-by: Simon Horman <horms@...nel.org>