Re: [PATCH v4 7/9] platform/chrome: of_hw_prober: Add delay for hana trackpads
Tzung-Bi Shih <[email protected]>
| Newsgroups | org.kernel.vger.linux-input,dev.linux.lists.chrome-platform,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-mediatek,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-i2c,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
On Tue, Aug 11, 2026 at 08:20:07PM +0800, Chen-Yu Tsai wrote:
> Up until now, the MT8173 elm/hana device tree has set the dedicated
> regulator supplying the trackpad as always-on, simply because the Elan
> driver was missing proper delays. As a result the delay for the
> Synaptics trackpad was also omitted, as it was not strictly required
> under such a model and delayed the availability of the trackpad to the
> user.
>
> The Elan driver recently gained proper delays after power-up, with
> adaptive skipping of the delay if the regulator was originally
> on. The I2C HID driver and I2C OF component prober library gained
> similar adaptive delay skipping. The device tree will be fixed to have
> the regulator not be always on, and proper post-power-on delay time
> added to the I2C HID device.
>
> Also add the post-power-on delay to the ChromeOS OF component prober,
> so that if the regulator is off at the time of probing, the prober knows
> to wait for the hardware to initialize.
> [...]
This looks harmless even without the aforementioned patches.
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next
[7/9] platform/chrome: of_hw_prober: Add delay for hana trackpads
commit: 81c1c0cb68a13d14dd1bbffcf4c49e26f9a6478c
Thanks!