[meta-freescale] Question on CPU frequency scaling on linux-fslc

[Fabio Estevam]

Hi Andreas,

On Fri, Oct 19, 2018 at 6:09 AM Andreas Müller <schnitzeltony at gmail.com> wrote:
>
> Hi,
>
> Have a Variscite VarSOM running linux-fslc with devicetree
> imx6q-var-som-vsc.dts from meta-freescale-3rdparty. The frequencies
> available on machine are: 396/792/996MHz.
>
> Looking into linux-fslc arch/arm/boot/dts/imx6q.dtsi (this is what
> imx6q-var-som-vsc.dts includes) I would expect 396/792/852/996/1200
> MHz.
>
> Any ideas where I lost frequencies (think I had similar somewhere but
> cannot remember - sigh)?

The imx6 cpufreq driver reads the "speed grading" fuses in order to
determine what are the operating frequencies that will be populated,
so what you see is the normal behavior.

On a different topic: I remember you have been trying Etnaviv with
linux-fslc. One suggestion I could give you regarding performance is
to drop the CONFIG_PROVE_LOCKING=y option from imx_v6_v7_deffconfig.

Hope this helps.