mbox series

[v12,0/6] USB DWC3 host wake up support from system suspend

Message ID 1649321104-31322-1-git-send-email-quic_c_sanm@quicinc.com
Headers show
Series USB DWC3 host wake up support from system suspend | expand

Message

Sandeep Maheswaram April 7, 2022, 8:44 a.m. UTC 
Avoiding phy powerdown in host mode when wakeup capable devices are 
connected, so that it can be wake up by devices.
Set GENPD_FLAG_ALWAYS_ON flag to keep usb30_prim gdsc active to retain
controller status during suspend/resume.

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 (6):
  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
  dt-bindings: usb: dwc3: Add wakeup-source property support
  arm64: dts: qcom: sc7280: Add wakeup-source property for USB node

 .../devicetree/bindings/usb/snps,dwc3.yaml         |  5 ++
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |  1 +
 drivers/usb/dwc3/core.c                            | 29 ++++++---
 drivers/usb/dwc3/core.h                            |  4 ++
 drivers/usb/dwc3/dwc3-qcom.c                       | 74 +++++++++++++---------
 drivers/usb/dwc3/host.c                            | 25 ++++++++
 6 files changed, 99 insertions(+), 39 deletions(-)

Comments

Pavan Kondeti April 8, 2022, 2:02 a.m. UTC | #1 
On Thu, Apr 07, 2022 at 11:06:40AM -0700, Matthias Kaehlcke wrote:
> On Thu, Apr 07, 2022 at 02:15:04PM +0530, Sandeep Maheswaram wrote:
> > Adding wakeup-source property for USB controller in SC7280.
> > This property is added to inform that the USB controller is
> > wake up capable and to conditionally power down the phy during
> > system suspend.
> > 
> > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sc7280.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > index f0b64be..046262a 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > @@ -2916,6 +2916,7 @@
> >  				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> >  				phy-names = "usb2-phy", "usb3-phy";
> >  				maximum-speed = "super-speed";
> > +				wakeup-source;
> >  			};
> >  		};
> 
> Not all SC7280 boards may want to enable wakeup from USB, so this is
> probably best configured on a per-board basis.

This wakeup capability is provided by the SoC. If a particular
board does not want to support, ideally it needs to be disabled from
user space. The capability is always there but some platforms choose to
disable it.

Thanks,
Pavan
Matthias Kaehlcke April 8, 2022, 3:28 p.m. UTC | #2 
On Fri, Apr 08, 2022 at 07:32:39AM +0530, Pavan Kondeti wrote:
> On Thu, Apr 07, 2022 at 11:06:40AM -0700, Matthias Kaehlcke wrote:
> > On Thu, Apr 07, 2022 at 02:15:04PM +0530, Sandeep Maheswaram wrote:
> > > Adding wakeup-source property for USB controller in SC7280.
> > > This property is added to inform that the USB controller is
> > > wake up capable and to conditionally power down the phy during
> > > system suspend.
> > > 
> > > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
> > > ---
> > >  arch/arm64/boot/dts/qcom/sc7280.dtsi | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > > index f0b64be..046262a 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > > @@ -2916,6 +2916,7 @@
> > >  				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> > >  				phy-names = "usb2-phy", "usb3-phy";
> > >  				maximum-speed = "super-speed";
> > > +				wakeup-source;
> > >  			};
> > >  		};
> > 
> > Not all SC7280 boards may want to enable wakeup from USB, so this is
> > probably best configured on a per-board basis.
> 
> This wakeup capability is provided by the SoC. If a particular
> board does not want to support, ideally it needs to be disabled from
> user space. The capability is always there but some platforms choose to
> disable it.

I guess 'wakeup-source' is a bit of an edge case between hardware capability
(which is certainly required to make wakeup work) and policy.

arch/arm64/boot/dts/mediatek/mt2712-evb.dts and
arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi are two example where
'wakeup-source' is set at the board level for a USB controller.

It's also true that user space can disable wakeup as you said, and a board
could also delete the property in its device tree if desired.

With that I agree that setting 'wakeup-source' at the SoC level provides
more flexibility and is more in line with the DT as hardware description.

Reviewed-by: Matthias Kaehlcke <mka@chromium.org>