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Subject: Re: [PATCH v7 00/21] Move PMC clocks into Tegra PMC driver
From:   Sowjanya Komatineni <skomatineni@nvidia.com>
To:     Dmitry Osipenko <digetx@gmail.com>, <thierry.reding@gmail.com>,
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On 1/9/20 7:24 PM, Sowjanya Komatineni wrote:
>
> 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 =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>>> This patch series moves Tegra PMC clocks from clock driver to pmc=20
>>>> 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=20
>>>> 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=20
>>>> will
>>>> not go through.
>>>>
>>>> This patch series adds these Tegra PMC clocks and blink controls to=20
>>>> Tegra
>>>> PMC driver with PMC as clock provider and removes them from Tegra=20
>>>> clock
>>>> driver.
>>>>
>>>> PMC clock clk_out_1 is dedicated for audio mclk from Tegra30 thru=20
>>>> Tegra210
>>>> and clock driver does inital parent configuration for it and=20
>>>> enables them.
>>>> But this clock should be taken care by audio driver as there is no=20
>>>> 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=20
>>>> 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=20
> tegra_asoc_utils_init, suspend resume works.
>
> Without audio mclk enabled during tegra_asoc_utils_init, somehow it=20
> prevents entry to suspend on Tegra30 platform.
>
> Will look in detail..
>
audio mclk is only needed for audio and werid that having it not enabled=20
all the time like in current clock driver prevents suspend entry on Tegra30

Looks like this issue is masked earlier with having mclk enabled all the=20
time by clock driver.