linux-kernel - Re: [linux-sunxi] Re: [PATCH v3 10/12] arm64: dts: allwinner: h6: Add IR receiver node

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Date:   Tue, 4 Jun 2019 14:33:55 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-media@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH v3 10/12] arm64: dts: allwinner: h6:
 Add IR receiver node

Hi Clément,

On Mon, Jun 03, 2019 at 09:58:23PM +0200, Clément Péron wrote:
> Hi Ondrej,
> 
> On Fri, 31 May 2019 at 14:46, Ondřej Jirman <megous@...ous.com> wrote:
> >
> > Hello Clément,
> >
> > On Fri, May 31, 2019 at 12:25:32AM +0200, Clément Péron wrote:
> > > Hi Ondrej,
> > >
> > > On Thu, 30 May 2019 at 16:55, Ondřej Jirman <megous@...ous.com> wrote:
> > > >
> > > > Hello Clément,
> > > >
> > > > On Tue, May 28, 2019 at 06:14:38PM +0200, Clément Péron wrote:
> > > > > Allwinner H6 IR is similar to A31 and can use same driver.
> > > > >
> > > > > Add support for it.
> > > > >
> > > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > > ---
> > > > >  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 19 +++++++++++++++++++
> > > > >  1 file changed, 19 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > index 16c5c3d0fd81..649cbdfe452e 100644
> > > > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > @@ -647,6 +647,25 @@
> > > > >                               pins = "PL0", "PL1";
> > > > >                               function = "s_i2c";
> > > > >                       };
> > > > > +
> > > > > +                     r_ir_rx_pin: r-ir-rx-pin {
> > > > > +                             pins = "PL9";
> > > > > +                             function = "s_cir_rx";
> > > > > +                     };
> > > > > +             };
> > > > > +
> > > > > +             r_ir: ir@...0000 {
> > > > > +                             compatible = "allwinner,sun50i-h6-ir",
> > > > > +                                          "allwinner,sun6i-a31-ir";
> > > > > +                             reg = <0x07040000 0x400>;
> > > > > +                             interrupts = <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>;
> > > > > +                             clocks = <&r_ccu CLK_R_APB1_IR>,
> > > > > +                                      <&r_ccu CLK_IR>;
> > > > > +                             clock-names = "apb", "ir";
> > > > > +                             resets = <&r_ccu RST_R_APB1_IR>;
> > > > > +                             pinctrl-names = "default";
> > > > > +                             pinctrl-0 = <&r_ir_rx_pin>;
> > > > > +                             status = "disabled";
> > > > >               };
> > > >
> > > > Please make a comment here, that this is known broken on some boards and may
> > > > result IRQ flood if enabled. Otherwise noone will know.
> > >
> > > I'm planning to send a v4 next week with the IRQ_NONE return as Maxime
> > > suggested it.
> > > https://github.com/clementperon/linux/tree/h6_ir_v4
> > >
> > > But maybe we could also use the bit 5 of the IRQ status.
> >
> > Thanks, that's nice, but that will not make the HW work. That will just disable
> > it. The comment is still necessary.
> I have pushed a new version on my github.
> https://github.com/clementperon/linux/commits/h6_ir_v4
> 
> I will submit it, if you are ok with it.

the changes make it worse. Console is flooded with "Temporarily disable IRQ"
and other symptoms are the same as I described before. Interrupts are not
disabled in a any reasonable time. (I've waited for more > 5mins already.)

You probably need to disable interrupts right away, not wait for 100k failures.

thank you and regards,
	o.

> Thanks,
> Clément
> 
> >
> > thank you,
> >         o.
> >
> > > Regards, Clement
> > >
> > > >
> > > > thanks,
> > > >         o.
> > > >
> > > > >               r_i2c: i2c@...1400 {
> > > > > --
> > > > > 2.20.1
> > > > >
> > > > >
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