linux-kernel - Re: [PATCH] ARM: OMAP2+: Fix warnings with broken omap2_set_init

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Message-Id: <A0DC2BBE-C5A9-4873-BBD2-C69F7697B210@goldelico.com>
Date:   Fri, 6 Dec 2019 19:34:44 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Nishanth Menon <nm@...com>, Tero Kristo <t-kristo@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        André Roth <neolynx@...il.com>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Adam Ford <aford173@...il.com>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [PATCH] ARM: OMAP2+: Fix warnings with broken omap2_set_init_voltage()


> Am 06.12.2019 um 19:20 schrieb Tony Lindgren <tony@...mide.com>:
> 
> * H. Nikolaus Schaller <hns@...delico.com> [191203 16:55]:
>>> What we could do is augment the printk (or dev_err) to tell
>>> in these warnings what it is looking for...
>>> 
>>> 	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
>>> 	if (IS_ERR(opp)) {
>>> 		pr_err("%s: unable to find boot up OPP for vdd_%s freq %ulHz\n",
>>> 		__func__, vdd_name, freq);
>>> 		goto exit;
>>> 	}
>> 
>> Easier and always prints info:
>> 
>> 	freq = clk_get_rate(clk);
>> 	clk_put(clk);
>> 
>> 	pr_info("%s: vdd=%s clk=%s %luHz oh=%s\n", __func__, vdd_name, clk_name, freq, oh_name);
>> 
>> 	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
>> 
>> I get this:
>> 
>> [    2.908142] omap2_set_init_voltage: vdd=mpu_iva clk=dpll1_ck 1000000000Hz oh=mpu
>> [    2.930816] omap2_set_init_voltage: vdd=core clk=l3_ick 200000000Hz oh=l3_main
>> [    2.946228] omap2_set_init_voltage: unable to find boot up OPP for vdd_core
>> [    2.953460] omap2_set_init_voltage: unable to set vdd_core
> 
> OK yeah that's more descriptive.

So what does your board say as it is also unable to find the initial mpu_iva?
And/or does it show a different core clock?

> 
>> Which means that cpufreq already has increased dpll1_ck to 1 GHz
>> (I have removed the turbo-mode tags so that it already boots at
>> full speed) and l3_ick runs at initial 200 MHz.
> 
> OK. I wonder where this initial code should live though..

Well, we all agree that it should live in deserved retirement :)

But it has some positive effect and maybe "fixes" a bug in cpufreq-only setup.

BR,
Nikolaus