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Subject: Re: [Intel-wired-lan] [PATCH iwl-next v2 1/1] e1000e: correct
 TIMINCA on ADP/TGP systems with wrong XTAL frequency
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On 06/01/2026 12:03, Vitaly Lifshits wrote:
> On some Tiger Lake (TGP) and Alder Lake (ADP) platforms, the hardware
> XTAL clock is incorrectly interpreted as 24 MHz instead of the actual
> 38.4 MHz. This causes the PHC to run significantly faster than system
> time, breaking PTP synchronization.
>
> To mitigate this at runtime, measure PHC vs system time over ~1 ms using
> cross-timestamps. If the PHC increment differs from system time beyond
> the expected tolerance (currently >100 uSecs), reprogram TIMINCA for the
> 38.4 MHz profile and reinitialize the timecounter.
>
> Tested on an affected system using phc_ctl:
> Without fix:
> sudo phc_ctl enp0s31f6 set 0.0 wait 10 get
> clock time: 16.000541250 (expected ~10s)
>
> With fix:
> sudo phc_ctl enp0s31f6 set 0.0 wait 10 get
> clock time: 9.984407212 (expected ~10s)
>
> Signed-off-by: Vitaly Lifshits<vitaly.lifshits@intel.com>
> ---
> v2: avoid resetting the systim and rephrase commit message
> v1: initial version
> ---
>   drivers/net/ethernet/intel/e1000e/netdev.c | 80 ++++++++++++++++++++++
>   1 file changed, 80 insertions(+)
>
Tested-by: Avigail Dahan <avigailx.dahan@intel.com>

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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  <body>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 06/01/2026 12:03, Vitaly Lifshits
      wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:20260106100331.1576758-1-vitaly.lifshits@intel.com">
      <pre wrap="" class="moz-quote-pre">On some Tiger Lake (TGP) and Alder Lake (ADP) platforms, the hardware
XTAL clock is incorrectly interpreted as 24 MHz instead of the actual
38.4 MHz. This causes the PHC to run significantly faster than system
time, breaking PTP synchronization.

To mitigate this at runtime, measure PHC vs system time over ~1 ms using
cross-timestamps. If the PHC increment differs from system time beyond
the expected tolerance (currently &gt;100 uSecs), reprogram TIMINCA for the
38.4 MHz profile and reinitialize the timecounter.

Tested on an affected system using phc_ctl:
Without fix:
sudo phc_ctl enp0s31f6 set 0.0 wait 10 get
clock time: 16.000541250 (expected ~10s)

With fix:
sudo phc_ctl enp0s31f6 set 0.0 wait 10 get
clock time: 9.984407212 (expected ~10s)

Signed-off-by: Vitaly Lifshits <a class="moz-txt-link-rfc2396E" href="mailto:vitaly.lifshits@intel.com">&lt;vitaly.lifshits@intel.com&gt;</a>
---
v2: avoid resetting the systim and rephrase commit message
v1: initial version
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)

</pre>
    </blockquote>
    <p><span style="white-space: pre-wrap">
</span></p>
    <p><span data-teams="true">Tested-by: Avigail Dahan
        <a class="moz-txt-link-rfc2396E" href="mailto:avigailx.dahan@intel.com">&lt;avigailx.dahan@intel.com&gt;</a></span><span style="white-space: pre-wrap">
</span></p>
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