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From: Anand Moon <linux.amoon@gmail.com>
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: devicetree <devicetree@vger.kernel.org>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Kevin Hilman <khilman@baylibre.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Jerome Brunet <jbrunet@baylibre.com>
Subject: Re: [RFCv1 5/5] arm64/ARM: configs: Change CONFIG_PWM_MESON from m to y
Date: Sun, 27 Oct 2019 00:26:03 +0530	[thread overview]
Message-ID: <CANAwSgRKO2trabH635HhNR34mbL3n+4cs+Gg4GO_Zc6vuYW5JA@mail.gmail.com> (raw)
In-Reply-To: <CANAwSgRD-Vd-D1H5cDYMyTLRMfzdkrFuiy4KfXYt6S+0goF-2w@mail.gmail.com>

Hi Neil,

On Mon, 21 Oct 2019 at 21:11, Anand Moon <linux.amoon@gmail.com> wrote:
>
> Hi Neil,
>
> On Mon, 21 Oct 2019 at 19:55, Neil Armstrong <narmstrong@baylibre.com> wrote:
> >
> > Hi Anand,
> >
> > On 21/10/2019 16:11, Anand Moon wrote:
> > > Hi Martin,
> > >
> > > On Fri, 18 Oct 2019 at 23:40, Martin Blumenstingl
> > > <martin.blumenstingl@googlemail.com> wrote:
> > >>
> > >> Hi Anand,
> > >>
> > >> On Fri, Oct 18, 2019 at 4:04 PM Anand Moon <linux.amoon@gmail.com> wrote:
> > >> [...]
> > >>>> 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.
> > >> it's not clear to me if you have only tested with the PWM and/or
> > >> FCLK_DIV4 clocks. can you please describe what you have tested so far?
> > >>
> > > Sorry for delayed response.
> > >
> > > I had just looked into clk related to SD_EMMC_A/B/C,
> > > with adding CLK_IGNORE/CRITICAL.
> > > Also looked into clk_summary for eMMC and microSD card,
> > > to identify the root cause, but I failed to move ahead.
> > >
> > >> for reference - my way of debugging this in the past was:
> > >> 1. add some printks to clk_disable_unused_subtree (right after the
> > >> clk_core_is_enabled check) to see which clocks are being disabled
> > >> 2. add CLK_IGNORE_UNUSED or CLK_IS_CRITICAL to the clocks which are
> > >> being disabled based on the information from step #1
> > >> 3. (at some point I had a working kernel with lots of clocks with
> > >> CLK_IGNORE_UNUSED/CLK_IS_CRITICAL)
> > >> 4. start dropping the CLK_IGNORE_UNUSED/CLK_IS_CRITICAL flags again
> > >> until you have traced it down to the clocks that are the actual issue
> > >> (so far I always had only one clock which caused issues, but it may be
> > >> multiple)
> > >> 5. investigate (and/or ask on the mailing list, Amlogic developers are
> > >> reading the mails here as well) for the few clocks from step #4
> > >>
> > >
> > > Thanks for you valuable suggestion. I have your patch to debug this
> > > [0]  https://patchwork.kernel.org/patch/9725921/mbox/
> > >
> > > So from the fist step I could identify that all the clk were getting closed
> > > after some core cpu clk was failing. Here is the log.
> > >
> > > step1: [1] https://pastebin.com/p13F9HGG
> > >
> > > so I marked these clk as CLK_IGNORE_UNUSED and finally
> > > I made it to boot using microSD card.
> > >
> > > After this just I converted these CLK to CLK_IS_CRITICAL
> > > as mostly these are used the CPU clk for now.
> > > Here is boot log successful for as of now.
> > >
> > > Finally: [2]  https://pastebin.com/qB6pMyGQ
> > >
> > > I know clk maintainer are against marking flags as *CLK_IS_CRITICAL*
> > > But this is just the step to move ahead.
> >
> > Thanks for the extensive debug.
> >
> > >
> > > Attach is my local clk and dts patch.Just for testing.
> > > [3] clk_critical.patch
> >
> >
> > Could you test with only the following changes:
> > diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
> > index ea4c791f106d..f49f5463363e 100644
> > --- a/drivers/clk/meson/g12a.c
> > +++ b/drivers/clk/meson/g12a.c
> > @@ -298,6 +298,7 @@ static struct clk_regmap g12a_fclk_div2 = {
> >                         &g12a_fclk_div2_div.hw
> >                 },
> >                 .num_parents = 1,
> > +               .flags = CLK_IS_CRITICAL,
> >         },
> >  };
> >
> > @@ -672,7 +673,7 @@ static struct clk_regmap g12b_cpub_clk = {
> >                         &g12a_sys_pll.hw
> >                 },
> >                 .num_parents = 2,
> > -               .flags = CLK_SET_RATE_PARENT,
> > +               .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> >         },
> >  };
> >
>
I am blocked with my eMMC is not working with latest u-boot so that
I could not verify that nothing break with this changes.

Could you send this patch upstream with adding my.

Tested-by: Anand Moon <linux.amoon@gmail.com>

Best Regards
-Anand

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  reply	other threads:[~2019-10-26 18:56 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-07 13:16 [RFCv1 0/5] Odroid N2 failes to boot using upstream kernel & u-boot Anand Moon
2019-10-07 13:16 ` [RFCv1 1/5] arm64: dts: meson: Add missing 5V_EN gpio signal for VCC5V regulator Anand Moon
2019-10-07 14:19   ` Neil Armstrong
2019-10-07 15:28     ` Anand Moon
2019-10-07 13:16 ` [RFCv1 2/5] arm64: dts: meson: Add missing pwm control gpio signal for pwm-regulator Anand Moon
2019-10-07 14:20   ` Neil Armstrong
2019-10-07 15:30     ` Anand Moon
2019-10-07 13:16 ` [RFCv1 3/5] arm64: dts: meson: Add missing regulator linked to VDDAO_3V3 regulator to FLASH_VDD Anand Moon
2019-10-07 14:20   ` Neil Armstrong
2019-10-07 15:53     ` Anand Moon
2019-10-07 13:16 ` [RFCv1 4/5] arm64: dts: meson: Add missing regulator linked to VCCV5 regulator to VDDIO_C/TF_IO Anand Moon
2019-10-07 14:21   ` Neil Armstrong
2019-10-07 15:54     ` Anand Moon
2019-10-07 13:16 ` [RFCv1 5/5] arm64/ARM: configs: Change CONFIG_PWM_MESON from m to y Anand Moon
2019-10-07 14:25   ` Neil Armstrong
2019-10-07 15:52     ` Anand Moon
2019-10-07 20:10   ` Martin Blumenstingl
2019-10-07 22:57     ` Kevin Hilman
2019-10-08 14:38       ` Anand Moon
2019-10-08 17:40         ` Martin Blumenstingl
2019-10-09  8:48           ` Anand Moon
2019-10-09 12:04             ` Jerome Brunet
2019-10-18 14:04               ` Anand Moon
2019-10-18 14:13                 ` Neil Armstrong
2019-10-18 15:21                   ` Anand Moon
2019-10-18 18:10                 ` Martin Blumenstingl
2019-10-21 14:11                   ` Anand Moon
2019-10-21 14:25                     ` Neil Armstrong
2019-10-21 15:41                       ` Anand Moon
2019-10-26 18:56                         ` Anand Moon [this message]
2019-10-24 20:20                     ` Martin Blumenstingl
2019-10-09 17:05             ` Martin Blumenstingl
2019-10-08  7:19     ` Anand Moon

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