linux-kernel - Re: [PATCH mvebu v2 00/10] Armada 37xx: Fix cpufreq changing base CPU speed to 800 MHz from 1000 MHz

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Message-ID: <20210209225630.mdwnzkvnaz3r4blt@pali>
Date:   Tue, 9 Feb 2021 23:56:30 +0100
From:   Pali Rohár <pali@...nel.org>
To:     nnet <nnet@...tmail.fm>
Cc:     a.heider@...il.com, andrew@...n.ch, gerald@....net,
        gregory.clement@...tlin.com, kabel@...nel.org, kostap@...vell.com,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, luka.perkov@...tura.hr,
        miquel.raynal@...tlin.com, mturquette@...libre.com,
        rmk+kernel@...linux.org.uk, sboyd@...nel.org, tmn505@...il.com,
        vladimir.vid@...tura.hr
Subject: Re: [PATCH mvebu v2 00/10] Armada 37xx: Fix cpufreq changing base
 CPU speed to 800 MHz from 1000 MHz

On Tuesday 09 February 2021 14:52:56 nnet wrote:
> On Tue, Feb 9, 2021, at 2:42 PM, Pali Rohár wrote:
> > On Tuesday 09 February 2021 13:45:08 nnet wrote:
> > > On Tue, Feb 9, 2021, at 1:33 PM, Pali Rohár wrote:
> > > > On Tuesday 09 February 2021 13:00:26 nnet wrote:
> > > > > > If you have other Armada 3720 boards (Espressobin v5/v7, uDPU, Devel Board, ...) then it will be nice to do an additional tests and check if instability issues are finally fixed.
> > > > > 
> > > > > These patches applied to the 5.4.96 in OpenWrt (98d61b5) work fine so far on an Espressobin v7 AFAICT per changing values in /sys/devices/system/cpu/cpufreq/policy0.
> > > > > 
> > > > > Are these changes intended to work @1.2 GHz on the v7?
> > > > 
> > > > Hello! Do you have 1.2 GHz A3720 SoC?
> > > 
> > > Maybe (not)? ESPRESSObin_V7_1-0 on the underside.
> > 
> > Look at the package of SoC chip. On top of the package is printed
> > identifier 88F3720. On the last line should be one of the string:
> > C080, C100, C120, I080, I100 which identifies frequency
> > (080 = 800 MHz, 100 = 1 GHz, 120 = 1.2 GHz)
> > 
> > Can you check what is printed on A3720 SoC package?
> 
> Both of mine are 88F3720-A0-C120.

Interesting... it is really 1.2 GHz. I have not seen it yet. And few
weeks ago I thought that it was never available on market.

Well, if 1.2 GHz variant has same issues as 1 GHz variants then this
patch series should fix it. But you said that with this patch series is
board crashing when running at 1.2 GHz?