Re: [PATCH] usb: typec: mux: fsa4480: Keep the USB 2.0 switch on in DP-only modes

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In reply to: Joonhoe Kim: "[PATCH] usb: typec: mux: fsa4480: Keep the USB 2.0 switch on in DP-only modes"
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From: Konrad Dybcio

Date: Fri Oct 23 2026 - 04:01:30 EST

On 10/22/26 6:51 PM, Joonhoe Kim wrote:
> DisplayPort pin assignments C and E give all four SuperSpeed lanes to
> DisplayPort, but the USB 2.0 D+/D- pair is not part of the pin
> assignment and stays available. The FSA4480 sits on that pair, and in
> these modes the driver turns its USB switch off, so a USB 2.0 hub or
> device behind a DisplayPort sink is disconnected as soon as the
> DisplayPort mode is set.
>
> Configure the USB switch the same way in all DisplayPort modes.
>
> Fixes: c7054c31c1c9 ("usb: typec: fsa4480: rework mux & switch setup to handle more states")
> Signed-off-by: Joonhoe Kim <26rote@xxxxxxxxx>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

Konrad