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SubjectRe: [PATCH 2/2] ARM: dts: meson8b: odroidc1: Fix usb phy regulator power failed warning
Hi Martin,

On Sat, 19 Jan 2019 at 03:36, Martin Blumenstingl
<martin.blumenstingl@googlemail.com> wrote:
>
> Hi Anand,
>
> On Sun, Jan 13, 2019 at 7:18 PM Anand Moon <linux.amoon@gmail.com> wrote:
> >
> > Override the dr_mode from "host" to "peripheral" for dwc2
> > usb_phy0->usb0 initialization of OTG Micro-B type.
> > Changes fix the below warning for phy poweron failed --> -22
> >
> > This fix the initialization of c9040000.usb phy.
> >
> > [ 1.639706] phy phy-c1108800.phy.0: USB ID detect failed!
> > [ 1.643850] phy phy-c1108800.phy.0: phy poweron failed --> -22
> > [ 1.649706] ------------[ cut here ]------------
> > [ 1.654273] WARNING: CPU: 0 PID: 29 at drivers/regulator/core.c:2054 _regulator_put.part.8+0xf8/0xfc
> > [ 1.663400] Modules linked in:
> > [ 1.666439] CPU: 0 PID: 29 Comm: kworker/0:1 Not tainted 4.20.0-xc1ml #11
> > [ 1.673192] Hardware name: Amlogic Meson platform
> > [ 1.677894] Workqueue: events deferred_probe_work_func
> > [ 1.683027] [<c0312204>] (unwind_backtrace) from [<c030cb8c>] (show_stack+0x10/0x14)
> > [ 1.690746] [<c030cb8c>] (show_stack) from [<c0e223b8>] (dump_stack+0x8c/0xa0)
> > [ 1.697953] [<c0e223b8>] (dump_stack) from [<c0346334>] (__warn.part.3+0xbc/0xd8)
> > [ 1.705418] [<c0346334>] (__warn.part.3) from [<c03464b0>] (warn_slowpath_null+0x44/0x4c)
> > [ 1.713579] [<c03464b0>] (warn_slowpath_null) from [<c07df6b8>] (_regulator_put.part.8+0xf8/0xfc)
> > [ 1.722437] [<c07df6b8>] (_regulator_put.part.8) from [<c07df6e4>] (regulator_put+0x28/0x38)
> > [ 1.730859] [<c07df6e4>] (regulator_put) from [<c07df71c>] (regulator_bulk_free+0x28/0x38)
> > [ 1.739112] [<c07df71c>] (regulator_bulk_free) from [<c0943858>] (release_nodes+0x1bc/0x200)
> > [ 1.747537] [<c0943858>] (release_nodes) from [<c093f82c>] (really_probe+0x110/0x2cc)
> > [ 1.755350] [<c093f82c>] (really_probe) from [<c093fb4c>] (driver_probe_device+0x60/0x16c)
> > [ 1.763599] [<c093fb4c>] (driver_probe_device) from [<c093dcd4>] (bus_for_each_drv+0x80/0xc4)
> > [ 1.772110] [<c093dcd4>] (bus_for_each_drv) from [<c093f6ac>] (__device_attach+0xd0/0x138)
> > [ 1.780359] [<c093f6ac>] (__device_attach) from [<c093eae4>] (bus_probe_device+0x84/0x8c)
> > [ 1.788522] [<c093eae4>] (bus_probe_device) from [<c093ef80>] (deferred_probe_work_func+0x60/0x8c)
> > [ 1.797470] [<c093ef80>] (deferred_probe_work_func) from [<c035fdb8>] (process_one_work+0x218/0x504)
> > [ 1.806585] [<c035fdb8>] (process_one_work) from [<c0360ea8>] (worker_thread+0x2a8/0x5bc)
> > [ 1.814748] [<c0360ea8>] (worker_thread) from [<c0365a18>] (kthread+0x14c/0x154)
> > [ 1.822128] [<c0365a18>] (kthread) from [<c03010e8>] (ret_from_fork+0x14/0x2c)
> > [ 1.829331] Exception stack(0xee0ebfb0 to 0xee0ebff8)
> > [ 1.834369] bfa0: 00000000 00000000 00000000 00000000
> > [ 1.842534] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> > [ 1.850695] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
> > [ 1.857311] ---[ end trace e28bbc26874282a4 ]---
> > [ 1.861984] ------------[ cut here ]------------
> > [ 1.866524] WARNING: CPU: 0 PID: 29 at drivers/regulator/core.c:2054 _regulator_put.part.8+0xf8/0xfc
> > [ 1.875629] Modules linked in:
> > [ 1.878658] CPU: 0 PID: 29 Comm: kworker/0:1 Tainted: GW 4.20.0-xc1ml #11
> > [ 1.886817] Hardware name: Amlogic Meson platform
> > [ 1.891513] Workqueue: events deferred_probe_work_func
> > [ 1.896641] [<c0312204>] (unwind_backtrace) from [<c030cb8c>] (show_stack+0x10/0x14)
> > [ 1.904366] [<c030cb8c>] (show_stack) from [<c0e223b8>] (dump_stack+0x8c/0xa0)
> > [ 1.911573] [<c0e223b8>] (dump_stack) from [<c0346334>] (__warn.part.3+0xbc/0xd8)
> > [ 1.919041] [<c0346334>] (__warn.part.3) from [<c03464b0>] (warn_slowpath_null+0x44/0x4c)
> > [ 1.927203] [<c03464b0>] (warn_slowpath_null) from [<c07df6b8>] (_regulator_put.part.8+0xf8/0xfc)
> > [ 1.936060] [<c07df6b8>] (_regulator_put.part.8) from [<c07df6e4>] (regulator_put+0x28/0x38)
> > [ 1.944483] [<c07df6e4>] (regulator_put) from [<c07df71c>] (regulator_bulk_free+0x28/0x38)
> > [ 1.952734] [<c07df71c>] (regulator_bulk_free) from [<c0943858>] (release_nodes+0x1bc/0x200)
> > [ 1.961159] [<c0943858>] (release_nodes) from [<c093f82c>] (really_probe+0x110/0x2cc)
> > [ 1.968974] [<c093f82c>] (really_probe) from [<c093fb4c>] (driver_probe_device+0x60/0x16c)
> > [ 1.977224] [<c093fb4c>] (driver_probe_device) from [<c093dcd4>] (bus_for_each_drv+0x80/0xc4)
> > [ 1.985734] [<c093dcd4>] (bus_for_each_drv) from [<c093f6ac>] (__device_attach+0xd0/0x138)
> > [ 1.993984] [<c093f6ac>] (__device_attach) from [<c093eae4>] (bus_probe_device+0x84/0x8c)
> > [ 2.002147] [<c093eae4>] (bus_probe_device) from [<c093ef80>] (deferred_probe_work_func+0x60/0x8c)
> > [ 2.011092] [<c093ef80>] (deferred_probe_work_func) from [<c035fdb8>] (process_one_work+0x218/0x504)
> > [ 2.020209] [<c035fdb8>] (process_one_work) from [<c0360ea8>] (worker_thread+0x2a8/0x5bc)
> > [ 2.028371] [<c0360ea8>] (worker_thread) from [<c0365a18>] (kthread+0x14c/0x154)
> > [ 2.035752] [<c0365a18>] (kthread) from [<c03010e8>] (ret_from_fork+0x14/0x2c)
> > [ 2.042955] Exception stack(0xee0ebfb0 to 0xee0ebff8)
> > [ 2.047993] bfa0: 00000000 00000000 00000000 00000000
> > [ 2.056158] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> > [ 2.064320] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
> > [ 2.070934] ---[ end trace e28bbc26874282a5 ]---
> >
> > Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> > Cc: Jerome Brunet <jbrunet@baylibre.com>
> > Cc: Neil Armstrong <narmstrong@baylibre.com>
> > Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> > ---
> > Rebased on Kevin's amlogic/v5.0/fixes branch
> > Note the warning is not getting produced on the latest kernel.
> > ---
> > arch/arm/boot/dts/meson8b-odroidc1.dts | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
> > index a49a8509b288..9d7f725cfe35 100644
> > --- a/arch/arm/boot/dts/meson8b-odroidc1.dts
> > +++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
> > @@ -318,6 +318,7 @@
> >
> > &usb0 {
> > status = "okay";
> > + dr_mode = "peripheral";
> > };
> with this change I get the following message during boot:
> dwc2 c9040000.usb: Configuration mismatch. dr_mode forced to host
>
> as far as I understand your original problem is the following error
> from the USB2 PHY driver:
> phy phy-c1108800.phy.0: USB ID detect failed!
> phy phy-c1108800.phy.0: phy poweron failed --> -22
> maybe we should fix that instead?
>
>
> Regards
> Martin

I have tried to fix this bug using dts + phy changes. Please find the
details below.

# cat /sys/kernel/debug/regulator/regulator_summary
regulator use open bypass opmode voltage
current min max
---------------------------------------------------------------------------------------
regulator-dummy 6 5 0 unknown 0mV
0mA 0mV 0mV
c90c0000.usb 1
0mA 0mV 0mV
c90c0000.usb 1
0mA 0mV 0mV
c9040000.usb 1
0mA 0mV 0mV
c9040000.usb 1
0mA 0mV 0mV
VCCK 1 1 0 unknown 860mV
0mA 860mV 1140mV
cpu0 0
0mA 860mV 860mV
P5V0 3 4 0 unknown 5000mV
0mA 5000mV 5000mV
VCC1V8 1 1 0 unknown 1800mV
0mA 1800mV 1800mV
c1108680.adc 1
0mA 0mV 0mV
VCC3V3 1 2 0 unknown 3300mV
0mA 3300mV 3300mV
VDD_RTC 0 0 0 unknown 900mV
0mA 900mV 900mV
TFLASH_VDD 1 1 0 unknown 3300mV
0mA 3300mV 3300mV
c1108c20.mmc:slot@1 1
0mA 3300mV 3400mV
DDR_VDDC 0 0 0 unknown 1500mV
0mA 1500mV 1500mV
USB_VBUS 2 1 0 unknown 5000mV
0mA 5000mV 5000mV
phy-c1108800.phy.0 2
0mA 0mV 0mV
TF_IO 0 1 0 unknown 3300mV
0mA 1800mV 3300mV
c1108c20.mmc:slot@1 0
0mA 0mV 0mV

# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 1: Dev 6, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 3: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 3: Dev 4, If 2, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 3: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 3: Dev 4, If 3, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 4: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M

Now I am trying to fix initialization of the Bus 01.Port (usb0) otg port fix.

Best Regards
-Anand

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