Re: [PATCH 04/10] phy: qcom-usb-hsic: engage HSIC mode from phy_calibrate()

[Manivannan Sadhasivam]

On Mon, Aug 10, 2026 at 06:42:08PM +0300, Dmitry Baryshkov wrote:
> The PHY power-on sequence ends by engaging HSIC mode. With chipidea,
> power-on runs before the host is started, and the HSIC connect of an
> already-present device is latched at the moment HSIC mode is engaged:
> performed before the host runs (and before an onboard hub is taken out
> of reset), the connect is lost and the device is never seen. This is
> why the APQ8074 dragonboard USB4604 hub never enumerated on mainline
> while the vendor kernel - which performs the whole PHY sequence after
> usb_add_hcd() - sees it on every boot.
> 
> Keep the calibration setup and the pad mux in power-on, and move the
> HSIC mode enable (and the auto-resume disable) into the calibrate op,
> which the chipidea host now invokes after the host is up and the
> onboard device reset has been released.
> 
> Assisted-by: Claude:claude-fable-5
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>

- Mani

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