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From: Doug Anderson <dianders@chromium.org>
To: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Cc: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
	Felipe Balbi <felipe.balbi@linux.intel.com>,
	"heiko@sntech.de" <heiko@sntech.de>,
	Alan Stern <stern@rowland.harvard.edu>,
	"amstan@chromium.org" <amstan@chromium.org>,
	"linux-rockchip@lists.infradead.org"
	<linux-rockchip@lists.infradead.org>,
	William Wu <william.wu@rock-chips.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	Stefan Wahren <stefan.wahren@i2se.com>,
	Randy Li <ayaka@soulik.info>,
	"zyw@rock-chips.com" <zyw@rock-chips.com>,
	"mka@chromium.org" <mka@chromium.org>,
	"ryandcase@chromium.org" <ryandcase@chromium.org>,
	Amelie Delaunay <amelie.delaunay@st.com>,
	"jwerner@chromium.org" <jwerner@chromium.org>,
	"dinguyen@opensource.altera.com" <dinguyen@opensource.altera.com>,
	Elaine Zhang <zhangqing@rock-chips.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [v2,1/5] usb: dwc2: bus suspend/resume for hosts with DWC2_POWER_DOWN_PARAM_NONE
Date: Tue, 30 Apr 2019 18:51:35 -0700
Message-ID: <CAD=FV=UWGOWiCpy5qUY8oFHPyxdYJe7OsdWBDuCNcXBu5BJoGA@mail.gmail.com> (raw)

Hi,

On Mon, Apr 29, 2019 at 11:06 PM Artur Petrosyan
<Arthur.Petrosyan@synopsys.com> wrote:
>
> Hi,
>
> On 4/29/2019 21:34, Doug Anderson wrote:
> > Hi,
> >
> > On Mon, Apr 29, 2019 at 1:43 AM Artur Petrosyan
> > <Arthur.Petrosyan@synopsys.com> wrote:
> >>
> >> Hi,
> >>
> >> On 4/18/2019 04:15, Douglas Anderson wrote:
> >>> This is an attempt to rehash commit 0cf884e819e0 ("usb: dwc2: add bus
> >>> suspend/resume for dwc2") on ToT.  That commit was reverted in commit
> >>> b0bb9bb6ce01 ("Revert "usb: dwc2: add bus suspend/resume for dwc2"")
> >>> because apparently it broke the Altera SOCFPGA.
> >>>
> >>> With all the changes that have happened to dwc2 in the meantime, it's
> >>> possible that the Altera SOCFPGA will just magically work with this
> >>> change now.  ...and it would be good to get bus suspend/resume
> >>> implemented.
> >>>
> >>> This change is a forward port of one that's been living in the Chrome
> >>> OS 3.14 kernel tree.
> >>>
> >>> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> >>> ---
> >>> This patch was last posted at:
> >>>
> >>> https://urldefense.proofpoint.com/v2/url?u=https-3A__lkml.kernel.org_r_1446237173-2D15263-2D1-2Dgit-2Dsend-2Demail-2Ddianders-40chromium.org&d=DwIDAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=9hPBFKCJ_nBjJhGVrrlYOeOQjP_HlVzYqrC_D7niMJI&m=MMfe-4lZePyty6F5zfQ54kiYGuJWNulyRat944LkOsc&s=nExFpAPP_0plZfO5LMG1B-mqt1vyCvE35elVcyVgs8Y&e=
> >>>
> >>> ...and appears to have died the death of silence.  Maybe it could get
> >>> some bake time in linuxnext if we can't find any proactive testing?
> >>>
> >>> I will also freely admit that I don't know tons about the theory
> >>> behind this patch.  I'm mostly just re-hashing the original commit
> >>> from Kever that was reverted since:
> >>> * Turning on partial power down on rk3288 doesn't "just work".  I
> >>>     don't get hotplug events.  This is despite dwc2 auto-detecting that
> >>>     we are power optimized.
> >> What do you mean by doesn't "just work" ? It seem to me that even after
> >> adding this patch you don't get issues fixed.
> >> You mention that you don't get the hotplug events. Please provide dwc2
> >> debug logs and register dumps on this issue.
> >
> > I mean that partial power down in the currently upstream driver
> > doesn't work.  AKA: if I turn on partial power down in the upstream
> > driver then hotplug events break.  I can try to provide some logs.  On
> > what exact version of the code do you want logs?  Just your series?
> > Just my series?  Mainline?  Some attempt at combining both series?  As
> > I said things seem to sorta work with the combined series.  I can try
> > to clarify if that's the series you want me to test with.  ...or I can
> > wait for your next version?
> As I said this patch doesn't fix the issue with hotplug. With this patch
> or without the hotplug behaves as it was. I have tested it on our setup.
>
> Have you debugged your patch? Does it make any difference on your setup
> ? Does it fix the issue with hotplug?

I think we're still not taking on the same page.

My patch makes no attempt to make partial power down mode work.  My
patch attempts to make things work a little better when using
DWC2_POWER_DOWN_PARAM_NONE.  There is no use testing my patch with
partial power down as it shouldn't have any impact there.


> > I am by no means an expert on dwc2, but an assumption made in my patch
> > is that even cores that can't support partial power down can still
> > save some amount of power when hcd_suspend is called.
> Have you tried to debug dwc2 with power_down == DWC2_POWER_DOWN_PARAM_NONE ?
> >
> > Some evidence that this should be possible: looking at mainline Linux
> > and at dwc2_port_suspend(), I see:
> >
> > * It is currently called even when we have DWC2_POWER_DOWN_PARAM_NONE
> Currently (without your and my patches) (looking at mainline Linux) the
> function dwc2_port_suspend() is called anyway because its call is issued
> by the system. But it performs entering to suspend only in case of
> DWC2_POWER_DOWN_PARAM_PARTIAL.
>
> This is not an assumption. What I am pointing out is based on debugging
> and before making assumptions without debugging for me seems not ok.
>
> Currently without your patch and without my patches. In the
> dwc2_port_suspend() it will enter to suspend only in case that
> power_down == DWC2_POWER_DOWN_PARAM_PARTIAL. Because if you look at the
> code more carefully you will see
>
>         if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL)
>                 goto skip_power_saving;
>
> This says if power_down is not DWC2_POWER_DOWN_PARAM_PARTIAL then skip
> power saving.
>
> So but after your patch. If power_down is DWC2_POWER_DOWN_PARAM_NONE it
> tries to suspend.

We must be looking at different code.  I'm looking at Linux's tree, AKA:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/dwc2/hcd.c#n3488

I took a mainline kernel ("v5.1-rc7-5-g83a50840e72a") and added
printouts in dwc2_port_suspend() next to where it set HPRT0_SUSP and
PCGCTL_STOPPCLK in dwc2_port_suspend().

[  454.906364] dwc2 ff540000.usb: I'm setting HPRT0_SUSP
[  454.906367] dwc2 ff540000.usb: I'm setting PCGCTL_STOPPCLK

...and just to confirm:

# grep '^power' /sys/kernel/debug/*.usb/params
/sys/kernel/debug/ff540000.usb/params:power_down                    : 0
/sys/kernel/debug/ff580000.usb/params:power_down                    : 0

So I'm really quite convinced that on mainline Linux with
DWC2_POWER_DOWN_PARAM_NONE that dwc2_port_suspend() sets HPRT0_SUSP
and PCGCTL_STOPPCLK.


> > ...I believe that the net effect of my patch ends up doing both those
> > same two things in hcd_suspend.  That is: when power_down is
> > DWC2_POWER_DOWN_PARAM_NONE I believe my patch is really just doing the
> > same thing that dwc2_port_suspend() would do in the same case.  Is
> > that not OK?
> No if your patch is doing the same thing as it was doing before what is
> the purpose of the patch ?

The purpose is to make _dwc2_hcd_suspend() work more correctly in the
case where power_down is DWC2_POWER_DOWN_PARAM_NONE


> My testes show that your patch doesn't fix the issue related partial
> power down.

Right.  I have been trying to say that my patch doesn't do anything at
all for partial power down.  I am simply trying to make
DWC2_POWER_DOWN_PARAM_NONE work more correctly.

I haven't run all the power consumption tests in quite a long time and
I'll try to get it hooked up tomorrow to confirm that my patch really
truly is still needed to help with power consumption.  I did confirm
that at least there are cases where _dwc2_hcd_suspend() is called and
my patch is what sets the important bits.

-Doug

From: Doug Anderson <dianders@chromium.org>
To: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Cc: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
	Felipe Balbi <felipe.balbi@linux.intel.com>,
	"heiko@sntech.de" <heiko@sntech.de>,
	Alan Stern <stern@rowland.harvard.edu>,
	"amstan@chromium.org" <amstan@chromium.org>,
	"linux-rockchip@lists.infradead.org" 
	<linux-rockchip@lists.infradead.org>,
	William Wu <william.wu@rock-chips.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	Stefan Wahren <stefan.wahren@i2se.com>,
	Randy Li <ayaka@soulik.info>,
	"zyw@rock-chips.com" <zyw@rock-chips.com>,
	"mka@chromium.org" <mka@chromium.org>,
	"ryandcase@chromium.org" <ryandcase@chromium.org>,
	Amelie Delaunay <amelie.delaunay@st.com>,
	"jwerner@chromium.org" <jwerner@chromium.org>,
	"dinguyen@opensource.altera.com" <dinguyen@opensource.altera.com>,
	Elaine Zhang <zhangqing@rock-chips.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/5] usb: dwc2: bus suspend/resume for hosts with DWC2_POWER_DOWN_PARAM_NONE
Date: Tue, 30 Apr 2019 18:51:35 -0700
Message-ID: <CAD=FV=UWGOWiCpy5qUY8oFHPyxdYJe7OsdWBDuCNcXBu5BJoGA@mail.gmail.com> (raw)
Message-ID: <20190501015135.-yAyPgSa_5frLtkedmKGxLmH3giFPW7cMiXhkrX6GBM@z> (raw)
In-Reply-To: <SN1PR12MB24317F315C5A4DFE70F9CB0DA73A0@SN1PR12MB2431.namprd12.prod.outlook.com>

Hi,

On Mon, Apr 29, 2019 at 11:06 PM Artur Petrosyan
<Arthur.Petrosyan@synopsys.com> wrote:
>
> Hi,
>
> On 4/29/2019 21:34, Doug Anderson wrote:
> > Hi,
> >
> > On Mon, Apr 29, 2019 at 1:43 AM Artur Petrosyan
> > <Arthur.Petrosyan@synopsys.com> wrote:
> >>
> >> Hi,
> >>
> >> On 4/18/2019 04:15, Douglas Anderson wrote:
> >>> This is an attempt to rehash commit 0cf884e819e0 ("usb: dwc2: add bus
> >>> suspend/resume for dwc2") on ToT.  That commit was reverted in commit
> >>> b0bb9bb6ce01 ("Revert "usb: dwc2: add bus suspend/resume for dwc2"")
> >>> because apparently it broke the Altera SOCFPGA.
> >>>
> >>> With all the changes that have happened to dwc2 in the meantime, it's
> >>> possible that the Altera SOCFPGA will just magically work with this
> >>> change now.  ...and it would be good to get bus suspend/resume
> >>> implemented.
> >>>
> >>> This change is a forward port of one that's been living in the Chrome
> >>> OS 3.14 kernel tree.
> >>>
> >>> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> >>> ---
> >>> This patch was last posted at:
> >>>
> >>> https://urldefense.proofpoint.com/v2/url?u=https-3A__lkml.kernel.org_r_1446237173-2D15263-2D1-2Dgit-2Dsend-2Demail-2Ddianders-40chromium.org&d=DwIDAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=9hPBFKCJ_nBjJhGVrrlYOeOQjP_HlVzYqrC_D7niMJI&m=MMfe-4lZePyty6F5zfQ54kiYGuJWNulyRat944LkOsc&s=nExFpAPP_0plZfO5LMG1B-mqt1vyCvE35elVcyVgs8Y&e=
> >>>
> >>> ...and appears to have died the death of silence.  Maybe it could get
> >>> some bake time in linuxnext if we can't find any proactive testing?
> >>>
> >>> I will also freely admit that I don't know tons about the theory
> >>> behind this patch.  I'm mostly just re-hashing the original commit
> >>> from Kever that was reverted since:
> >>> * Turning on partial power down on rk3288 doesn't "just work".  I
> >>>     don't get hotplug events.  This is despite dwc2 auto-detecting that
> >>>     we are power optimized.
> >> What do you mean by doesn't "just work" ? It seem to me that even after
> >> adding this patch you don't get issues fixed.
> >> You mention that you don't get the hotplug events. Please provide dwc2
> >> debug logs and register dumps on this issue.
> >
> > I mean that partial power down in the currently upstream driver
> > doesn't work.  AKA: if I turn on partial power down in the upstream
> > driver then hotplug events break.  I can try to provide some logs.  On
> > what exact version of the code do you want logs?  Just your series?
> > Just my series?  Mainline?  Some attempt at combining both series?  As
> > I said things seem to sorta work with the combined series.  I can try
> > to clarify if that's the series you want me to test with.  ...or I can
> > wait for your next version?
> As I said this patch doesn't fix the issue with hotplug. With this patch
> or without the hotplug behaves as it was. I have tested it on our setup.
>
> Have you debugged your patch? Does it make any difference on your setup
> ? Does it fix the issue with hotplug?

I think we're still not taking on the same page.

My patch makes no attempt to make partial power down mode work.  My
patch attempts to make things work a little better when using
DWC2_POWER_DOWN_PARAM_NONE.  There is no use testing my patch with
partial power down as it shouldn't have any impact there.


> > I am by no means an expert on dwc2, but an assumption made in my patch
> > is that even cores that can't support partial power down can still
> > save some amount of power when hcd_suspend is called.
> Have you tried to debug dwc2 with power_down == DWC2_POWER_DOWN_PARAM_NONE ?
> >
> > Some evidence that this should be possible: looking at mainline Linux
> > and at dwc2_port_suspend(), I see:
> >
> > * It is currently called even when we have DWC2_POWER_DOWN_PARAM_NONE
> Currently (without your and my patches) (looking at mainline Linux) the
> function dwc2_port_suspend() is called anyway because its call is issued
> by the system. But it performs entering to suspend only in case of
> DWC2_POWER_DOWN_PARAM_PARTIAL.
>
> This is not an assumption. What I am pointing out is based on debugging
> and before making assumptions without debugging for me seems not ok.
>
> Currently without your patch and without my patches. In the
> dwc2_port_suspend() it will enter to suspend only in case that
> power_down == DWC2_POWER_DOWN_PARAM_PARTIAL. Because if you look at the
> code more carefully you will see
>
>         if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL)
>                 goto skip_power_saving;
>
> This says if power_down is not DWC2_POWER_DOWN_PARAM_PARTIAL then skip
> power saving.
>
> So but after your patch. If power_down is DWC2_POWER_DOWN_PARAM_NONE it
> tries to suspend.

We must be looking at different code.  I'm looking at Linux's tree, AKA:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/dwc2/hcd.c#n3488

I took a mainline kernel ("v5.1-rc7-5-g83a50840e72a") and added
printouts in dwc2_port_suspend() next to where it set HPRT0_SUSP and
PCGCTL_STOPPCLK in dwc2_port_suspend().

[  454.906364] dwc2 ff540000.usb: I'm setting HPRT0_SUSP
[  454.906367] dwc2 ff540000.usb: I'm setting PCGCTL_STOPPCLK

...and just to confirm:

# grep '^power' /sys/kernel/debug/*.usb/params
/sys/kernel/debug/ff540000.usb/params:power_down                    : 0
/sys/kernel/debug/ff580000.usb/params:power_down                    : 0

So I'm really quite convinced that on mainline Linux with
DWC2_POWER_DOWN_PARAM_NONE that dwc2_port_suspend() sets HPRT0_SUSP
and PCGCTL_STOPPCLK.


> > ...I believe that the net effect of my patch ends up doing both those
> > same two things in hcd_suspend.  That is: when power_down is
> > DWC2_POWER_DOWN_PARAM_NONE I believe my patch is really just doing the
> > same thing that dwc2_port_suspend() would do in the same case.  Is
> > that not OK?
> No if your patch is doing the same thing as it was doing before what is
> the purpose of the patch ?

The purpose is to make _dwc2_hcd_suspend() work more correctly in the
case where power_down is DWC2_POWER_DOWN_PARAM_NONE


> My testes show that your patch doesn't fix the issue related partial
> power down.

Right.  I have been trying to say that my patch doesn't do anything at
all for partial power down.  I am simply trying to make
DWC2_POWER_DOWN_PARAM_NONE work more correctly.

I haven't run all the power consumption tests in quite a long time and
I'll try to get it hooked up tomorrow to confirm that my patch really
truly is still needed to help with power consumption.  I did confirm
that at least there are cases where _dwc2_hcd_suspend() is called and
my patch is what sets the important bits.

-Doug

         reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-18  0:13 [PATCH v2 0/5] USB: dwc2: Allow wakeup from suspend; enable for rk3288-veyron Douglas Anderson
2019-04-18  0:13 ` [v2,1/5] usb: dwc2: bus suspend/resume for hosts with DWC2_POWER_DOWN_PARAM_NONE Doug Anderson
2019-04-18  0:13   ` [PATCH v2 1/5] " Douglas Anderson
2019-04-29  8:43   ` [v2,1/5] " Artur Petrosyan
2019-04-29  8:43     ` [PATCH v2 1/5] " Artur Petrosyan
2019-04-29 17:33     ` [v2,1/5] " Doug Anderson
2019-04-29 17:33       ` [PATCH v2 1/5] " Doug Anderson
2019-04-30  6:05       ` [v2,1/5] " Artur Petrosyan
2019-04-30  6:05         ` [PATCH v2 1/5] " Artur Petrosyan
2019-05-01  1:51         ` Doug Anderson [this message]
2019-05-01  1:51           ` Doug Anderson
2019-05-03  8:20           ` [v2,1/5] " Artur Petrosyan
2019-05-03  8:20             ` [PATCH v2 1/5] " Artur Petrosyan
2019-05-03 15:03             ` [v2,1/5] " Doug Anderson
2019-05-03 15:03               ` [PATCH v2 1/5] " Doug Anderson
2019-05-07  7:26               ` Artur Petrosyan
2019-05-01 23:58   ` [v2,1/5] " Doug Anderson
2019-05-01 23:58     ` [PATCH v2 1/5] " Doug Anderson
2019-05-03  8:25     ` [v2,1/5] " Artur Petrosyan
2019-05-03  8:25       ` [PATCH v2 1/5] " Artur Petrosyan
2019-05-03 15:07       ` [v2,1/5] " Doug Anderson
2019-05-03 15:07         ` [PATCH v2 1/5] " Doug Anderson
2019-05-07  7:05         ` Artur Petrosyan
2019-04-18  0:13 ` [v2,2/5] USB: Export usb_wakeup_enabled_descendants() Doug Anderson
2019-04-18  0:13   ` [PATCH v2 2/5] " Douglas Anderson
2019-04-18  0:13 ` [v2,3/5] Documentation: dt-bindings: Add snps,need-phy-for-wake for dwc2 USB Doug Anderson
2019-04-18  0:13   ` [PATCH v2 3/5] " Douglas Anderson
2019-04-25 12:40   ` [v2,3/5] " Felipe Balbi
2019-04-25 12:40     ` [PATCH v2 3/5] " Felipe Balbi
2019-04-25 18:09     ` [v2,3/5] " Doug Anderson
2019-04-25 18:09       ` [PATCH v2 3/5] " Doug Anderson
2019-04-25 19:58       ` [v2,3/5] " Doug Anderson
2019-04-25 19:58         ` [PATCH v2 3/5] " Doug Anderson
2019-05-02 18:36     ` [v2,3/5] " Doug Anderson
2019-05-02 18:36       ` [PATCH v2 3/5] " Doug Anderson
2019-04-30  1:23   ` [v2,3/5] " Rob Herring
2019-04-30  1:23     ` [PATCH v2 3/5] " Rob Herring
2019-04-30  5:25     ` [v2,3/5] " Doug Anderson
2019-04-30  5:25       ` [PATCH v2 3/5] " Doug Anderson
2019-04-18  0:13 ` [v2,4/5] USB: dwc2: Don't turn off the usbphy in suspend if wakeup is enabled Doug Anderson
2019-04-18  0:13   ` [PATCH v2 4/5] " Douglas Anderson
2019-04-25 12:41   ` [v2,4/5] " Felipe Balbi
2019-04-25 12:41     ` [PATCH v2 4/5] " Felipe Balbi
2019-04-18  0:13 ` [v2,5/5] ARM: dts: rockchip: Allow wakeup from rk3288-veyron's dwc2 USB ports Doug Anderson
2019-04-18  0:13   ` [PATCH v2 5/5] " Douglas Anderson
2019-04-18 12:40 ` [PATCH v2 0/5] USB: dwc2: Allow wakeup from suspend; enable for rk3288-veyron Minas Harutyunyan
2019-04-18 15:54   ` Doug Anderson
2019-04-19 11:43     ` Artur Petrosyan
2019-04-19 16:44       ` Artur Petrosyan
2019-04-22 15:50         ` Artur Petrosyan

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