[v15 0/6] USB DWC3 host wake up support from system suspend

From: Krishna Kurapati <quic_kriskura@quicinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Rob Herring <robh+dt@kernel.org>, Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Felipe Balbi <balbi@kernel.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Doug Anderson <dianders@chromium.org>,
	"Matthias Kaehlcke" <mka@chromium.org>,
	Mathias Nyman <mathias.nyman@intel.com>
Cc: <devicetree@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
	<linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-pm@vger.kernel.org>, <quic_pkondeti@quicinc.com>,
	<quic_ppratap@quicinc.com>, <quic_vpulyala@quicinc.com>,
	Krishna Kurapati <quic_kriskura@quicinc.com>
Subject: [v15 0/6] USB DWC3 host wake up support from system suspend
Date: Thu, 5 May 2022 14:26:07 +0530	[thread overview]
Message-ID: <1651740973-7944-1-git-send-email-quic_kriskura@quicinc.com> (raw)

Avoiding phy powerdown in host mode when wakeup capable devices are 
connected, so that it can be wake up by devices.
Keep usb30_prim gdsc active to retain controller status
during suspend/resume.

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.

Krishna Kurapati (1):
  usb: host: xhci-plat: Enable wakeup based on children wakeup status

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                            | 33 ++++----
 drivers/usb/dwc3/core.h                            |  4 +
 drivers/usb/dwc3/dwc3-qcom.c                       | 91 +++++++++++++---------
 drivers/usb/dwc3/host.c                            | 24 ++++++
 drivers/usb/host/xhci-plat.c                       |  8 ++
 6 files changed, 115 insertions(+), 50 deletions(-)

-- 
2.7.4