linux-kernel - Re: [PATCH v6 00/41] ARM: davinci: convert to common clock framework

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Date:   Tue, 23 Jan 2018 13:24:41 -0600
From:   David Lechner <david@...hnology.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Adam Ford <aford173@...il.com>, linux-clk@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 00/41] ARM: davinci: convert to common clock framework

On 01/23/2018 12:34 PM, Bartosz Golaszewski wrote:
> 2018-01-23 19:26 GMT+01:00 David Lechner <david@...hnology.com>:
>> On 01/23/2018 12:10 PM, Bartosz Golaszewski wrote:
>>>
>>> 2018-01-23 18:03 GMT+01:00 Adam Ford <aford173@...il.com>:
>>>>
>>>> On Tue, Jan 23, 2018 at 10:06 AM, David Lechner <david@...hnology.com>
>>>> wrote:
>>>>>
>>>>> On 01/23/2018 10:03 AM, David Lechner wrote:
>>>>>>
>>>>>>
>>>>>> You can see if the clock is enabled by running:
>>>>>>
>>>>>>        cat /sys/kernel/debug/clk/clk_summary
>>>>>>
>>>>>
>>>>> I just realized if you can't boot, you can't do this. :-/
>>>>
>>>>
>>>> I can boot with the latest set in your git repo, but the Ethernet
>>>> doesn't apparently fully operate.  I don't get errors, but I cannot
>>>> get a dhcp address.
>>>>
>>>> I'll try to do a more exhaustive test later today to get an idea of
>>>> what works and what doesn't.  When I ran my basic tests, I just did a
>>>> feel-good boot test (and reboot test)
>>>>
>>>> adam
>>>
>>>
>>> FYI: manually calling clk_prepare_enable() in the davinci_mdio driver
>>> seems to at least fix the ethernet. In master branch it's done by
>>> pm_runtime_get_sync() (in davinci_mdio_reset()). However I'm still
>>> getting several oopses and WARNs so there's some more work to do.
>>>
>>
>> Hmm... I'm wondering if we need to also add #power-domain-cells to the
>> PSC clocks and power-domains properties to the consumers.
>>
>> For this specific case though, it seems strange to me that the drivers
>> to clk_get() and clk_get_rate() but never enable the clocks.
>>
>>
>> Also, are the oopses and WARNs the same as before?
> 
> No, the ones before were all related to the ethernet failing, now I
> get several stack traces from drm. Posted them on pastebin[1].
> 

It looks like the LCDC driver is the same way. It does clk_get() but
not clk_prepare_enable().