linux-kernel - Re: [RFC v4 0/5] Add multiport support for DWC3 controllers

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Message-ID: <81f29a76-4daf-d5ec-afd5-e2305fbb8feb@quicinc.com>
Date:   Thu, 19 Jan 2023 10:47:14 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Bjorn Andersson <andersson@...nel.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_wcheng@...cinc.com>,
        <quic_jackp@...cinc.com>, <quic_harshq@...cinc.com>
Subject: Re: [RFC v4 0/5] Add multiport support for DWC3 controllers



On 1/19/2023 9:13 AM, Bjorn Andersson wrote:
> On Sun, Jan 15, 2023 at 05:11:41PM +0530, Krishna Kurapati wrote:
>> Currently the DWC3 driver supports only single port controller which
>> requires at most two PHYs ie HS and SS PHYs. There are SoCs that has
>> DWC3 controller with multiple ports that can operate in host mode.
>> Some of the port supports both SS+HS and other port supports only HS
>> mode.
>>
>> This change primarily refactors the Phy logic in core driver to allow
>> multiport support with Generic Phy's.
>>
>> Chananges have been tested on  QCOM SoC SA8295P which has 4 ports (2
>> are HS+SS capable and 2 are HS only capable).
>>
> 
> I can confirm that applying this series allow me to use all 6 USB ports
> on the ADP. Looking forward to v5.
> 
> Thanks,
> Bjorn
> 
Thanks Bjorn for testing it out.

Regards,
Krishna,
>> Changes in v4:
>> Added DT support for SA8295p.
>>
>> Changes in v3:
>> Incase any PHY init fails, then clear/exit the PHYs that
>> are already initialized.
>>
>> Changes in v2:
>> Changed dwc3_count_phys to return the number of PHY Phandles in the node.
>> This will be used now in dwc3_extract_num_phys to increment num_usb2_phy
>> and num_usb3_phy.
>>
>> Added new parameter "ss_idx" in dwc3_core_get_phy_ny_node and changed its
>> structure such that the first half is for HS-PHY and second half is for
>> SS-PHY.
>>
>> In dwc3_core_get_phy, for multiport controller, only if SS-PHY phandle is
>> present, pass proper SS_IDX else pass -1.
>>
>> Link to v3: https://lore.kernel.org/all/1654709787-23686-1-git-send-email-quic_harshq@quicinc.com/#r
>> Link to v2: https://lore.kernel.org/all/1653560029-6937-1-git-send-email-quic_harshq@quicinc.com/#r
>>
>> Krishna Kurapati (5):
>>    dt-bindings: usb: Add bindings to support multiport properties
>>    usb: dwc3: core: Refactor PHY logic to support Multiport Controller
>>    usb: dwc3: core: Do not setup event buffers for host only controllers
>>    usb: dwc3: qcom: Add multiport controller support for qcom wrapper
>>    arm: dts: msm: Add multiport controller node for usb
>>
>>   .../devicetree/bindings/usb/snps,dwc3.yaml    |  42 ++-
>>   arch/arm64/boot/dts/qcom/sa8295p-adp.dts      |  49 +++
>>   arch/arm64/boot/dts/qcom/sc8280xp.dtsi        |  60 ++++
>>   drivers/usb/dwc3/core.c                       | 325 +++++++++++++-----
>>   drivers/usb/dwc3/core.h                       |  15 +-
>>   drivers/usb/dwc3/drd.c                        |  14 +-
>>   drivers/usb/dwc3/dwc3-qcom.c                  |  28 +-
>>   7 files changed, 429 insertions(+), 104 deletions(-)
>>
>> -- 
>> 2.39.0
>>