On Thu, Jan 27, 2022 at 11:15:12AM +0100, Neil Armstrong wrote:
> Hi,
>
> On 27/01/2022 00:43, Lutz Koschorreck wrote:
> > The interrupt pin of the external ethernet phy is used, instead of the
> > enable-gpio pin of the tf-io regulator. The GPIOE_2 pin is located in
> > the gpio_ao bank.
> > Using open drain prevents reboot issues.
> >
> > This causes phy interrupt problems at system startup.
> > [ 76.645190] irq 36: nobody cared (try booting with the "irqpoll" option)
> > [ 76.649617] CPU: 0 PID: 1416 Comm: irq/36-0.0:00 Not tainted 5.16.0 #2
> > [ 76.649629] Hardware name: Hardkernel ODROID-HC4 (DT)
> > [ 76.649635] Call trace:
> > [ 76.649638] dump_backtrace+0x0/0x1c8
> > [ 76.649658] show_stack+0x14/0x60
> > [ 76.649667] dump_stack_lvl+0x64/0x7c
> > [ 76.649676] dump_stack+0x14/0x2c
> > [ 76.649683] __report_bad_irq+0x38/0xe8
> > [ 76.649695] note_interrupt+0x220/0x3a0
> > [ 76.649704] handle_irq_event_percpu+0x58/0x88
> > [ 76.649713] handle_irq_event+0x44/0xd8
> > [ 76.649721] handle_fasteoi_irq+0xa8/0x130
> > [ 76.649730] generic_handle_domain_irq+0x38/0x58
> > [ 76.649738] gic_handle_irq+0x9c/0xb8
> > [ 76.649747] call_on_irq_stack+0x28/0x38
> > [ 76.649755] do_interrupt_handler+0x7c/0x80
> > [ 76.649763] el1_interrupt+0x34/0x80
> > [ 76.649772] el1h_64_irq_handler+0x14/0x20
> > [ 76.649781] el1h_64_irq+0x74/0x78
> > [ 76.649788] irq_finalize_oneshot.part.56+0x68/0xf8
> > [ 76.649796] irq_thread_fn+0x5c/0x98
> > [ 76.649804] irq_thread+0x13c/0x260
> > [ 76.649812] kthread+0x144/0x178
> > [ 76.649822] ret_from_fork+0x10/0x20
> > [ 76.649830] handlers:
> > [ 76.653170] [<0000000025a6cd31>] irq_default_primary_handler threaded [<0000000093580eb7>] phy_interrupt
> > [ 76.661256] Disabling IRQ #36
> >
> > Fixes: 1f80a5cf74a6 ("arm64: dts: meson-sm1-odroid: add missing enable gpio and supply for tf_io regulator")
> >
> > Signed-off-by: Lutz Koschorreck <theleks@xxxxxxxx>
> > ---
> > arch/arm64/boot/dts/amlogic/meson-sm1-odroid.dtsi | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid.dtsi b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid.dtsi
> > index 0bd1e98a0eef..ddb1b345397f 100644
> > --- a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid.dtsi
> > +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid.dtsi
> > @@ -48,7 +48,7 @@ tf_io: gpio-regulator-tf_io {
> > regulator-max-microvolt = <3300000>;
> > vin-supply = <&vcc_5v>;
> >
> > - enable-gpio = <&gpio GPIOE_2 GPIO_ACTIVE_HIGH>;
> > + enable-gpio = <&gpio_ao GPIOE_2 GPIO_OPEN_DRAIN>;
>
> Wow, indeed it's not the right GPIO chip... my bad.
>
> > enable-active-high;
> > regulator-always-on;
> >
>
> Concerning the GPIO_OPEN_DRAIN, it's right since the line has a pull-up, does it really fix reboot issues ?
There is a 10k pull up on the pin of C4 and HC4. Therefore it is fine to
set to GPIO_OPEN_DRAIN. If this pin is left ACTIVE_HIGH and I call
reboot, the bootloader is does not came up, it is an boot loop. Tobetter
fixed that with a reset device driver, but I think using GPIO_OPEN_DRAIN
is the right solution.
>
> Anyway, can you split the changes ? First for gpio_ao, second for GPIO_OPEN_DRAIN ?
Yes of cause. I will generate a new patch set.
>
> Neil
>
>
> _______________________________________________
> linux-amlogic mailing list
> linux-amlogic@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-amlogic
