linux-kernel - Re: [RFCv1 5/5] arm64/ARM: configs: Change CONFIG_PWM

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Date:   Fri, 18 Oct 2019 19:34:14 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv1 5/5] arm64/ARM: configs: Change CONFIG_PWM_MESON from m to y

Hi Jerome / Neil / Martin,

On Wed, 9 Oct 2019 at 17:34, Jerome Brunet <jbrunet@...libre.com> wrote:
>
>
> On Wed 09 Oct 2019 at 10:48, Anand Moon <linux.amoon@...il.com> wrote:
> >
> > Kernel command line: console=ttyAML0,115200n8
> > root=PARTUUID=45d7d61e-01 rw rootwait
> > earlyprintk=serial,ttyAML0,115200 initcall_debug printk.time=y
> >
> > [0] https://pastebin.com/eBgJrSKe
> >
> >> you can also try the command line parameter "clk_ignore_unused" (it's
> >> just a gut feeling: maybe a "critical" clock is being disabled because
> >> it's not wired up correctly).
> >>
> >
> > It look like some clk issue after I added the *clk_ignore_unused* to
> > kernel command line
> > it booted further to login prompt and cpufreq DVFS seem to be loaded.
> > So I could conclude this is clk issue.below is the boot log
> >
> > Kernel command line: console=ttyAML0,115200n8
> > root=PARTUUID=45d7d61e-01 rw rootwait
> > earlyprintk=serial,ttyAML0,115200 initcall_debug printk.time=y
> > clk_ignore_unused
> >
> > [1] https://pastebin.com/Nsk0wZQJ
> >
>
> Next step it to try narrow down the clock causing the issue.
> Remove clk_ignore_unused from the command line and add CLK_INGORE_UNUSED
> to the flag of some clocks your clock controller (g12a I think) until
>
> The peripheral clock gates already have this flag (something we should
> fix someday) so don't bother looking there.
>
> Most likely the source of the pwm is getting disabled between the
> late_init call and the probe of the PWM module. Since the pwm is already
> active (w/o a driver), gating the clock source shuts dowm the power to
> the cores.
>
> Looking a the possible inputs in pwm driver, I'd bet on fdiv4.
>

I had give this above steps a try but with little success.
I am still looking into this much close.

Well I am not the expert in clk or bus configuration.
but after looking into the datasheet of for clk configuration
I found some bus are not configured correctly.

As per Amlogic's kernel S922X (Hardkernel)
below link share the bus controller.

[0] https://github.com/hardkernel/linux/blob/odroidn2-4.9.y/arch/arm64/boot/dts/amlogic/mesong12b.dtsi#L295-L315

looking in to current dts changes it looks bit wrong to me.

*As per 6.1 Memory Map*
apb_efuse: bus@...00  --> apb_efuse: bus@...30000
periphs: bus@...00    --> periphs: bus@...34400
dmc: bus@...00        --> dmc: bus@...38000
hiu: bus@...00        --> hiu: bus@...3c0000

Also the order of these is not correct.

Down the line in the datasheet some of the interrupt GIC bit are not
mapped correctly for example.

*As per 6.9.2 Interrupt Control Source*
223 SD_EMMC_C
222 SD_EMMC_B
221 SD_EMMC_A

and so on.
Please share your thought if these changes are valid.

Best Regards
-Anand