linux-kernel - Re: [PATCH v3 5/6] phy: qcom: qmp-combo: register a typec mux to change the QMPPHY

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Message-ID: <07aa740a-72f1-4d7a-aefc-437d52b8dac8@oss.qualcomm.com>
Date: Wed, 28 May 2025 13:22:41 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Konrad Dybcio <konradybcio@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v3 5/6] phy: qcom: qmp-combo: register a typec mux to
 change the QMPPHY_MODE

On 5/28/25 1:21 PM, Konrad Dybcio wrote:
> On 5/28/25 10:58 AM, Dmitry Baryshkov wrote:
>> On Wed, May 28, 2025 at 12:22:01AM +0200, Konrad Dybcio wrote:
>>> On 5/27/25 11:55 PM, Dmitry Baryshkov wrote:
>>>> On Tue, May 27, 2025 at 10:40:07PM +0200, Konrad Dybcio wrote:
>>>>> From: Neil Armstrong <neil.armstrong@...aro.org>
>>>>>
>>>>> Register a typec mux in order to change the PHY mode on the Type-C
>>>>> mux events depending on the mode and the svid when in Altmode setup.
>>>>>
>>>>> The DisplayPort phy should be left enabled if is still powered on
>>>>> by the DRM DisplayPort controller, so bail out until the DisplayPort
>>>>> PHY is not powered off.
>>>>>
>>>>> The Type-C Mode/SVID only changes on plug/unplug, and USB SAFE states
>>>>> will be set in between of USB-Only, Combo and DisplayPort Only so
>>>>> this will leave enough time to the DRM DisplayPort controller to
>>>>> turn of the DisplayPort PHY.
>>>>>
>>>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>>>>> [konrad: renaming, rewording, bug fixes]
>>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>>>>> ---
>>>
>>> [...]
>>>
>>>>> +	} else {
>>>>> +		/* Fall back to USB3+DP mode if we're not sure it's strictly USB3-only */
>>>>
>>>> Why? if the SID is not DP, then there can't be a DP stream.
>>>>
>>>>> +		if (state->mode == TYPEC_MODE_USB3 || state->mode == TYPEC_STATE_USB)
>>>>> +			new_mode = QMPPHY_MODE_USB3_ONLY;
>>>>> +		else
>>>>> +			new_mode = QMPPHY_MODE_USB3DP;
>>>
>>> To be honest I don't really know.. Neil chose to do that, but I don't
>>> think there's a strict requirement.. Should we default to 4ln-USB3?
>>
>> Yes, QMPPHY_MODE_USB3_ONLY. Nit: there is no 4ln-USB3 (it is a special
>> mode). We handle 2ln-USB3 only.
> 
> Right, I double checked and we support SS

I clicked ctrl-z one too many times - I meant SS+ 10Gbps

Konrad