linux-kernel - Re: [PATCH 1/1] arm64: dts: rockchip: correct voltage selector Firefly-RK3399

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Date:   Wed, 20 Jun 2018 01:21:31 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Heinrich Schuchardt <xypron.glpk@....de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Vagrant Cascadian <vagrant@...ian.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Pierre-Hugues Husson <phh@....me>,
        Jianqun Xu <jay.xu@...k-chips.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: correct voltage selector Firefly-RK3399

Hi Heinrich,

Am Donnerstag, 14. Juni 2018, 14:55:27 CEST schrieb Heiko Stuebner:
> Am Montag, 4. Juni 2018, 19:15:23 CEST schrieb Heinrich Schuchardt:
> > Without this patch the Firefly-RK3399 board boot process hangs after these
> > lines:
> > 
> >    fan53555-regulator 0-0040: FAN53555 Option[8] Rev[1] Detected!
> >    fan53555-reg: supplied by vcc_sys
> >    vcc1v8_s3: supplied by vcc_1v8
> > 
> > Blacklisting driver fan53555 allows booting.
> > 
> > The device tree uses a value of fcs,suspend-voltage-selector different to
> > any other board.
> > 
> > Changing this setting to the usual value is sufficient to enable booting.
> > 
> > Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> 
> applied for 4.19.

and dropped again.

Sadly it looks like the patch causes conflicts with at least one firefly
board in a kernelci lab. My own is currently not ready to use, so I cannot
look myself right now.

The issue kernelci people described sounded quite a lot like the one
in your commit message, so my current theory is that the
suspend-voltage-selector must in some form corespond to the
cpu_b_sleep_h gpio setting we're currently not handling at all, which
would therefore depend on how the bootloader sets this up.


Heiko