linux-kernel - Re: [PATCH] cpufreq: sun50i: Fix CPU speed bin detection

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Date:   Fri, 1 Nov 2019 17:01:34 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     linux-sunxi@...glegroups.com, Yangtao Li <tiny.windzz@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:ALLWINNER CPUFREQ DRIVER" <linux-pm@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: sun50i: Fix CPU speed bin detection

On Fri, Nov 01, 2019 at 04:07:01PM +0100, Maxime Ripard wrote:
> On Thu, Oct 31, 2019 at 07:13:58PM +0100, Ondrej Jirman wrote:
> > I have failures to boot on Orange Pi 3, because this driver determined
> > that my SoC is from the normal bin, but my SoC only works reliably with
> > the OPP values for the slowest bin.
> >
> > Looking at BSP code, I found that efuse values have following meanings
> > on H6:
> >
> > - 0b000 invalid (interpreted in vendor's BSP as normal bin)
> > - 0b001 slowest bin
> > - 0b011 normal bin
> > - 0b111 fastest bin
> >
> > Let's play it safe and interpret 0 as the slowest bin, but fix detection
> > of other bins to match vendor code.
> >
> > Fixes: f328584f7bff ("cpufreq: Add sun50i nvmem based CPU scaling driver")
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> 
> Acked-by: Maxime Ripard <mripard@...nel.org>
> 
> Out of curiosity, which OPP table is being used? I guess it's one of
> the dozens of patches sitting there...

I'm using one from Orange Pi 3's fex file from Xunlong:

https://github.com/orangepi-xunlong/OrangePiH6_external/blob/master/sys_config/OrangePiH6_3_sys_config.fex
https://megous.com/git/linux/commit/?h=ths-5.4&id=7b409e83b4ac70f3435886da6a26cecf9af77213

This one doesn't really differentiate between normal/fast bins.

There's also another one in the Allwinner DTS files:

https://github.com/orangepi-xunlong/OrangePiH6_Linux4_9/blob/master/arch/arm64/boot/dts/sunxi/sun50iw6p1.dtsi#L349

which seems to be the one used by Yangtao Li in the dt-bindings
docummentation.
	
regards,
	o.

> Maxime