linux-kernel - Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for cpu clocks

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Date:   Mon, 18 Mar 2019 13:28:44 +0200
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>
Cc:     Christian Neubert <christian.neubert.86@...il.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Mike Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] clk: mvebu: armada-37xx-periph: Fix initialization for
 cpu clocks

Hi Gregory, 
> Hi Ilias,
>  
>  On jeu., mars 14 2019, Ilias Apalodimas <ilias.apalodimas@...aro.org> wrote:
> 
> > Hello Christian,
> >> Hi,
> >> 
> >> I assume you use the 1000 MHz firmware. This does also not work on my Rev 7
> >> board. But I'm pretty sure this is not a problem of the patches, because if
> >> I take a newer kernel (4.19.20/27) without the patches it also does not
> >> work. A kernel 4.19.17 does work for me. My opinion on that is that this is
> >> another problem which does just occure now because now the cpu frequency
> >> scaling is working with the right frequencies.
> > I am not sure which firmware i am running, i did all my tests on 5.0.0 and
> > changing between governors worked fine without the patches
> 
> Curently my espressobin is broken so I tested the patches on the Armada
> 3700 DB and I didn't observe the issue you had.
> 
> The 3700 DB I used is configured to run at 800MHz.
> 
> Could you apply the following patch and sent me the boot log?
> 
> diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
> index 26ed3c18a239..f814ade5cd80 100644
> --- a/drivers/clk/mvebu/armada-37xx-periph.c
> +++ b/drivers/clk/mvebu/armada-37xx-periph.c
> @@ -452,14 +452,17 @@ static int clk_pm_cpu_set_parent(struct clk_hw *hw, u8 index)
>  
>         /* Set the parent clock for all the load level */
>         for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
> -               unsigned int reg, mask,  val,
> +               unsigned int reg, mask,  val, old,
>                         offset = ARMADA_37XX_NB_TBG_SEL_OFF;
>  
>                 armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
>  
>                 val = index << offset;
>                 mask = ARMADA_37XX_NB_TBG_SEL_MASK << offset;
> +               regmap_read(base, reg, &old);
>                 regmap_update_bits(base, reg, mask, val);
> +               pr_err("%s old=%X -> val=0x%X load_level=%d\n",
> +                      __func__, old,  val, load_level);
>         }
>         return 0;
>  }
> 
> 
> 
[   14.909524] clk_pm_cpu_set_parent old=28004840 -> val=0x6000000 load_level=0
[   14.916424] clk_pm_cpu_set_parent old=2E004840 -> val=0x600 load_level=1
[   14.923315] clk_pm_cpu_set_parent old=8880A8C0 -> val=0x6000000 load_level=2
[   14.930572] clk_pm_cpu_set_parent old=8E80A8C0 -> val=0x600 load_level=3


Let me know if you need anything else

Regards
/Ilias