linux-kernel - Re: [PATCH] clk: imx6ull: use OSC clock during AXI rate change

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Message-ID: <ae5b239a57bd7e3f3e62cc23a1c3788e@agner.ch>
Date:   Wed, 09 May 2018 16:12:59 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Jacky Bai <ping.bai@....com>
Cc:     Stephen Boyd <sboyd@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        kernel@...gutronix.de, Fabio Estevam <fabio.estevam@....com>,
        mturquette@...libre.com, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx6ull: use OSC clock during AXI rate change

On 09.05.2018 03:26, Jacky Bai wrote:
>> Subject: Re: [PATCH] clk: imx6ull: use OSC clock during AXI rate change
>>
>> Quoting Stefan Agner (2018-05-08 06:20:03)
>> > On 08.05.2018 09:32, Jacky Bai wrote:
>> > >
>> > > I have tried two 6ULL board, I don't meet such issue. System can
>> > > boot up successfully with commit 6f9575e55632 included.
>> > > Anyway, the change in this patch is ok for me. it is no harm to the
>> > > BUS clock change flow.
>> >
>> > Hm, that is interesting, maybe it is because we use a different SKU?
>> > Or maybe bootloader?
>> >
>> > I tested here with a 800 MHz clocked variant on a Colibri iMX6ULL
>> > using U-Boot 2016.11.
>> >
>>
>> I'll throw this into fixes today because it fixes something to be useful. It's still
>> interesting to see what's different between the two setups though.
> 
> Thanks. 
> 
> I will find some 800MHz parts and have a try with different bootloader later.
> Will let you know, when I have some results.
> 

FWIW, I tried two SKUs here:
MCIMX6Z2DVM05AA (528Mhz)
MCIMX6Z2CVM08AA (800MHz)

Both run at 396MHz in U-Boot, and both freeze and the same location.

--
Stefan