From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Joonhoe Kim <26rote@gmail.com>,
heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org
Cc: neil.armstrong@linaro.org, linux-usb@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] usb: typec: mux: fsa4480: Keep the USB 2.0 switch on in DP-only modes
Date: Fri, 23 Oct 2026 10:01:07 +0200 [thread overview]
Message-ID: <5422680d-e642-4a85-9119-6a5ac5443d50@oss.qualcomm.com> (raw)
In-Reply-To: <20261022165143.1327-1-26rote@gmail.com>
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@gmail.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
prev parent reply other threads:[~2026-10-23 8:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-22 16:51 Joonhoe Kim
2026-10-23 8:01 ` Konrad Dybcio [this message]
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