linux-kernel - Re: [Letux-kernel] [PATCH v3 3/3] arm: omap_hwmod disable ick autoidling when a hwmod requires that

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Message-ID: <c2c283c5-d1f7-8b65-a19b-0c4af80b722a@ti.com>
Date:   Sat, 19 Jan 2019 12:09:48 +0530
From:   "J, KEERTHY" <j-keerthy@...com>
To:     Tony Lindgren <tony@...mide.com>,
        Andreas Kemnade <andreas@...nade.info>
CC:     Discussions about the Letux Kernel <letux-kernel@...nphoenux.org>,
        <paul@...an.com>, <sboyd@...nel.org>, <mturquette@...libre.com>,
        <linux-kernel@...r.kernel.org>, <t-kristo@...com>,
        <bcousson@...libre.com>, <linux-omap@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
Subject: Re: [Letux-kernel] [PATCH v3 3/3] arm: omap_hwmod disable ick
 autoidling when a hwmod requires that



On 1/19/2019 1:18 AM, Tony Lindgren wrote:
> * Andreas Kemnade <andreas@...nade.info> [190118 19:42]:
>> On Fri, 18 Jan 2019 20:38:47 +0100
>> Andreas Kemnade <andreas@...nade.info> wrote:
>>
>>> Hi,
>>>
>>> On Fri, 18 Jan 2019 10:36:30 -0800
>>> Tony Lindgren <tony@...mide.com> wrote:
>>>
>>> [...]
>>>> til the next workaround.
>>>>    
>>>>> That flags also causes the iclk being enabled/disabled
>>>>> manually.
>>>>
>>>> Yes but SWSUP_IDLE for the interface clock to me currently
>>>> just means:
>>>>
>>>> "manually enable and disable ocp interface clock"
>>>>    
>>> well, if we want to manually disable it and not automatically,
>>> we have to disable autoidle or it will be automatically disabled.
>>>
>>> Disabling it manually when it is already auto-disabled (by autoidle) is
>>> just practically a no-op towards the clock.
>>>
>>>> and with your changes it becomes:
>>>>
>>>> "manually enable and disable ocp interface clock and block
>>>>   autoidle while in use".
>>>>
>>>> So aren't we now changing the way things behave in general
>>>> for SWSUP_IDLE?
>>>>    
>>> Yes, we are, so proper testing is needed. But If I read those comments
>>> it was always intended this way but not fully implemented because it
>>> appeared to be more work like needing a usecounter (which my patchset
>>> also adds) for that autoidle flag.
>>>
>> and there are quite few hwmods marked by this flag.
>> And then there are those clocks marked by this flags (on am33xx) which
>> do not have that autoidle feature at all, so the risk is not too high.
> 
> Keerthy, can you please test this series on top of the
> related clock patches with your am335x PM test cases?

Can you point me to the clock series that needs to be tested
along with this?

- Keerthy

> 
> Regards,
> 
> Tony
> 
>