[PATCH v15 09/16] phy: rockchip: usbdp: Fix LFPS detect threshold control

[Manivannan Sadhasivam]

On Tue, Sep 15, 2026 at 03:49:56PM +0200, Sebastian Reichel wrote:
> From: William Wu <william.wu at rock-chips.com>
> 
> According to the LFPS Tx Low Power/LFPS Rx Detect Threshold [1],
> the device under test(DUT) must not respond if LFPS below the
> minimum LFPS Rx Detect Threshold 100mV. Test fail on Rockchip
> platforms, because the default LFPS detect threshold is set to
> 65mV.
> 
> The USBDP PHY LFPS detect threshold voltage could be set to
> 30mV ~ 140mV, and since there could be 10-20% PVT variation,
> we set LFPS detect threshold voltage to 110mV.
> 
> [1] https://compliance.usb.org/resources/LFPS_Rx_Tx_Low_Power_Compliance_Update_Rev5.pdf
> 
> Signed-off-by: William Wu <william.wu at rock-chips.com>
> [Taken over from rockchip's kernel tree; the registers are not described
> in the TRM]
> Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>
> Tested-by: Igor Paunovic <royalnet026 at gmail.com> # Orange Pi 5 Plus
> Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam at oss.qualcomm.com>

- Mani

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