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

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Message-ID: <20230119034352.stbhutga5ounihj7@builder.lan>
Date:   Wed, 18 Jan 2023 21:43:52 -0600
From:   Bjorn Andersson <andersson@...nel.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
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 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

> 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
>