Re: [PATCH v3] platform/chrome: cros_ec_sensorhub: Modify clock drift estimation

[Tzung-Bi Shih <tzungbi@kernel.org>]

On Tue, Oct 13, 2026 at 10:56:50AM +0000, Satyam Gupta wrote:
> On Tue, Jul 28, 2026 at 10:15:52AM +0000, Tzung-Bi Shih wrote:
> > > This CL makes 5 specific changes to the clock drift estimation algorithm
> > 
> > Since these are 5 distinct logical changes, shouldn't they be separated into
> > a 5-patch series?
> 
> Although the v3 commit description listed the adjustments as 5 bullet points,
> they are tightly coupled parts of a single fix to support sensor batching in
> the timestamp filter without breaking intermediate states:
> 
> - Extending TS_HISTORY_BORED_US from 0.5s to 2.0s so the filter survives 1-2s
>   batch flush intervals requires the 10x dx ODR/mode-change reset and slope
>   clamping; otherwise, transitions between active streaming and batching (which
>   previously exceeded the 0.5s timeout) mix into the same filter history.
> - The 10x dx check (which reads state->x_history[1] when history_len > 1)
>   depends directly on the loop start index fix: previously, with
>   `i = state->history_len - 1`, the loop did not run when `history_len == 1`,
>   leaving `x_history[1]` unpopulated when `history_len` became 2.
> - Dropping strictly past timestamps instead of clamping them to `last_ts`
>   prevents post-reset backward ticks from being mistaken for same-timestamp
>   batches by `cros_ec_sensor_ring_spread_add()`.
> 
> I have reworded the commit message in v4 to explain how these pieces work
> together as a single cohesive change rather than a numbered list of unrelated
> items.

I'm not convinced.  I think they should still separate into 5 patches and
form a series.

> > On a related note, is [1] still relevant?  Should we disregard it?
> > 
> > [1] https://lore.kernel.org/all/20260720110405.2127011-1-sgsatyam@google.com
> 
> Yes, [1] ("platform/chrome: cros_ec_sensorhub: Fix AP/EC TS wrap") is still
> relevant — it addresses 32-bit EC timestamp rollover across deep AP suspend.

Please resend or include it in the same series.