Date:   Thu, 2 Jun 2022 18:39:05 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>
Subject: Re: [PATCH v20 0/5] USB DWC3 host wake up support from system suspend

On Thu, Jun 02, 2022 at 01:54:32PM +0530, Krishna Kurapati wrote:
> Avoiding phy powerdown in host mode when dwc3 is wakeup capable, so that
> it can be wake up by devices. Keep usb30_prim gdsc active to retain
> controller status during suspend/resume.
> 
> Changes in v20:
> Fixed nitpicks in dwc3 qcom driver.
> Fixed code changes in dwc3 core driver.
> 
> Changes in v19:
> Fixed dwc3 driver code changes.
> 
> Changes in v18:
> Fixed minor nit picks in v17 reported by Matthias.
> 
> Changes in v17:
> Moved the speed check to glue driver.
> Powering down phy's solely based on dwc3 wakeup capability.
> Configuring the interrupt functions appropriately.
> 
> Changes in v16:
> Added changes to power down the phy's during suspend only if dwc3
> is not wakeup capable.
> 
> Changes in v15:
> Added patch to enable wakeup for xhci-plat based on children wakeup status.
> Used device_wakeup_path instead of device_children_wakeup_capable
> 
> Changes in v14:
> Added patch for device_children_wakeup_capable.
> Used device_children_wakeup_capable instead of usb_wakeup_enabled_descendants.
> Fixed minor nit picks in v13 reported by Matthias.
> 
> Changes in v13:
> Moved the dt bindings patch to start.
> Changed dwc3_set_phy_speed_mode to dwc3_check_phy_speed_mode.
> Check wakep-source property for dwc3 core node to set the
> wakeup capability. Drop the device_init_wakeup call from
> runtime suspend and resume.
> Added GENPD_FLAG_RPM_ALWAYS_ON and set GENPD_FLAG_ALWAYS_ON if
> wakeup is supported.
> 
> Changes in v12:
> Squashed PATCH 1/5 and 2/5 of v11.
> Added dt bindings and device tree entry for wakeup-source property
> for dwc3 core node.
> Dropped redundant phy_set_mode call.
> 
> 
> Changes in v11:
> Moving back to v8 version
> https://patchwork.kernel.org/project/linux-arm-msm/cover/1624882097-23265-1-git-send-email-sanm@codeaurora.org
> as we are getting interrupts during suspend
> when enabling both DP hs phy irq and DM hs phy irq.
> Moved the set phy mode function to dwc3/core.c from xhci-plat.c
> We didn't find any other option other than accessing xhci from dwc.
> 
> Changes in v10:
> PATCH 1/6: Change device_set_wakeup_capable to device_set_wakeup_enable
> PATCH 2/6: Remove redundant else part in dwc3_resume_common
> PATCH 4/6: Change the irg flags
> PATCH 5/6: Set flag GENPD_FLAG_ALWAYS_ON
> PATCH 6/6: Remove disable interrupts function and enable
> interrupts in probe.
> 
> 
> Changes in v9:
> Checking with device_may_makeup property instead of phy_power_off flag.
> Changed the IRQ flags and removed hs_phy_mode variable.
> 
> Changes in v8:
> Moved the dwc3 suspend quirk code in dwc3/host.c to xhci-plat.c
> Checking phy_power_off flag instead of usb_wakeup_enabled_descendants 
> to keep gdsc active.
> 
> Changes in v7:
> Change in commit text and message in PATCH 1/5 and PATCH 5/5
> as per Matthias suggestion.
> Added curly braces for if and else if sections in PATCH 4/5.
> 
> Changes in v6:
> Addressed comments in host.c and core.c
> Separated the patches in dwc3-qcom.c to make it simple.
> Dropped wakeup-source change as it is not related to this series.
> 
> Changes in v5:
> Added phy_power_off flag to check presence of wakeup capable devices.
> Dropped patch[v4,4/5] as it is present linux-next.
> Addressed comments in host.c and dwc3-qcom.c.
> 
> Changes in v4:
> Addressed Matthias comments raised in v3.
> 
> Changes in v3:
> Removed need_phy_for_wakeup flag and by default avoiding phy powerdown.
> Addressed Matthias comments and added entry for DEV_SUPERSPEED.
> Added suspend_quirk in dwc3 host and moved the dwc3_set_phy_speed_flags.
> Added wakeup-source dt entry and reading in dwc-qcom.c glue driver.
> 
> Changes in v2:
> Dropped the patch in clock to set GENPD_FLAG_ACTIVE_WAKEUP flag and 
> setting in usb dwc3 driver.
> Separated the core patch and glue driver patch.
> Made need_phy_for_wakeup flag part of dwc structure and 
> hs_phy_flags as unsgined int.
> Adrressed the comment on device_init_wakeup call.
> Corrected offset for reading portsc register.
> Added pacth to support wakeup in xo shutdown case.
> 
> Sandeep Maheswaram (5):
>   dt-bindings: usb: dwc3: Add wakeup-source property support
>   usb: dwc3: core: Host wake up support from system suspend
>   usb: dwc3: qcom: Add helper functions to enable,disable wake irqs
>   usb: dwc3: qcom: Configure wakeup interrupts during suspend
>   usb: dwc3: qcom: Keep power domain on to retain controller status
> 
>  .../devicetree/bindings/usb/snps,dwc3.yaml         |   5 +
>  drivers/usb/dwc3/core.c                            |   9 +-
>  drivers/usb/dwc3/dwc3-qcom.c                       | 140 +++++++++++++++------
>  3 files changed, 108 insertions(+), 46 deletions(-)
> 

This series looks good to me. I think it is ready for merge unless Felipe has
any concerns.

Thanks,
Pavan

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