[PATCH V2] usb: ehci-mx6: Enable OTG detection on imx8mm and imx8mn

Fabio Estevam festevam at gmail.com
Thu Dec 23 15:56:40 CET 2021

Hi Adam,

On Thu, Dec 23, 2021 at 11:08 AM Adam Ford <aford173 at gmail.com> wrote:
> The imx8mm and imx8mn appear compatible with imx7d-usb
> flags in the OTG driver.  If the dr_mode is defined as
> host or peripheral, the device appears to operate correctly,
> however the auto host/peripheral detection results in an error.
> The solution isn't just adding checks for imx8mm and imx8mn to
> the check for imx7, because the USB clock needs to be running
> to read from the USBNC_PHY_STATUS_OFFSET register or it will hang.
> The init_type in both priv and plat data are the same, so it doesn't
> make sense to configure the data in the plat data and copy the
> data to priv when priv can be configured directly.  Instead, rename
> ehci_usb_of_to_plat to ehci_usb_dr_mode and call it from the
> probe functions after the clocks are enabled, but before the data
> is required.
> With that added, the additional checks for imx8mm and imx8mn will
> allow reading the register to automatically determine the state
> (host or device) of the OTG controller.
> Signed-off-by: Adam Ford <aford173 at gmail.com>

Tested "ums 0 mmc 0" on a imx7s-warp. It still works fine:

Tested-by: Fabio Estevam <festevam at gmail.com>

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