linux-kernel - Re: [PATCH v7 00/21] Move PMC clocks into Tegra PMC driver

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Message-ID: <37a9676b-e0e5-7e80-5ee4-abfca361dcf7@nvidia.com>
Date:   Thu, 9 Jan 2020 19:24:48 -0800
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <broonie@...nel.org>,
        <lgirdwood@...il.com>, <perex@...ex.cz>, <tiwai@...e.com>,
        <mperttunen@...dia.com>, <gregkh@...uxfoundation.org>,
        <sboyd@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <spujar@...dia.com>, <josephl@...dia.com>,
        <daniel.lezcano@...aro.org>, <mmaddireddy@...dia.com>,
        <markz@...dia.com>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 00/21] Move PMC clocks into Tegra PMC driver


On 1/9/20 5:39 PM, Sowjanya Komatineni wrote:
>
> On 1/9/20 11:44 AM, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 08.01.2020 07:24, Sowjanya Komatineni пишет:
>>> This patch series moves Tegra PMC clocks from clock driver to pmc 
>>> driver
>>> along with the device trees changes and audio driver which uses one of
>>> the pmc clock for audio mclk.
>>>
>>> Tegra PMC has clk_out_1, clk_out_2, clk_out_3 and blink controls which
>>> are currently registered by Tegra clock driver using clk_regiser_mux 
>>> and
>>> clk_register_gate which performs direct Tegra PMC register access.
>>>
>>> When Tegra PMC is in secure mode, any access from non-secure world will
>>> not go through.
>>>
>>> This patch series adds these Tegra PMC clocks and blink controls to 
>>> Tegra
>>> PMC driver with PMC as clock provider and removes them from Tegra clock
>>> driver.
>>>
>>> PMC clock clk_out_1 is dedicated for audio mclk from Tegra30 thru 
>>> Tegra210
>>> and clock driver does inital parent configuration for it and enables 
>>> them.
>>> But this clock should be taken care by audio driver as there is no need
>>> to have this clock pre enabled.
>>>
>>> So, this series also includes patch that updates ASoC driver to take
>>> care of parent configuration for mclk if device tree don't specify
>>> initial parent configuration using assigned-clock-parents and controls
>>> audio mclk enable/disable during ASoC machine startup and shutdown.
>>>
>>> DTs are also updated to use clk_out_1 as audio mclk rather than 
>>> extern1.
>>>
>>> This series also includes a patch for mclk fallback to extern1 when
>>> retrieving mclk fails to have this backward compatible of new DT with
>>> old kernels.
>> Suspend-resume doesn't work anymore, reverting this series helps. I
>> don't have any other information yet, please take a look.
> Thanks Dmitry. Will test suspend resume and check..

I see if we leave audio mclk (cdev1) enabled during 
tegra_asoc_utils_init, suspend resume works.

Without audio mclk enabled during tegra_asoc_utils_init, somehow it 
prevents entry to suspend on Tegra30 platform.

Will look in detail..