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From: Neil Armstrong <>
To: Stephen Boyd <>,,
Subject: Re: [PATCH RFC 1/2] clk: introduce clk_invalidate_rate()
Date: Fri, 27 Sep 2019 08:40:42 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 27/09/2019 02:14, Stephen Boyd wrote:
> Quoting Neil Armstrong (2019-09-19 03:25:17)
>> This introduces the clk_invalidate_rate() call used to recalculate the
>> rate and parent tree of a particular clock if it's known that the
>> underlying registers set has been altered by the firmware, like from
>> a suspend/resume handler running in trusted cpu mode.
>> The call refreshes the actual parent and when changed, instructs CCF
>> the parent has changed. Finally the call will recalculate the rate of
>> each part of the tree to make sure the CCF cached tree is in sync with
>> the hardware.
>> Signed-off-by: Neil Armstrong <>
>> ---
> The knee-jerk reaction to these patches is that it shouldn't be a
> consumer API (i.e. taking a struct clk) but a provider API (i.e. taking
> a struct clk_hw). I haven't looked in any more detail but just know that
> it's a non-starter to be a consumer based API because we don't want
> random consumers out there to be telling the CCF or provider drivers
> that some clk has lost state and needs to be "refreshed".

Totally agree, I hesitated and obviously did the wrong choice, but
this is a nit, the main algorithm is not tied to the API level.

Should I resend it with clk_hw ? the difference will be small and
the main subject is the resync algorithm.


linux-amlogic mailing list

  reply	other threads:[~2019-09-27  6:40 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19 10:25 [PATCH RFC 0/2] clk: meson: g12a: handle clock hw changes while in suspend Neil Armstrong
2019-09-19 10:25 ` [PATCH RFC 1/2] clk: introduce clk_invalidate_rate() Neil Armstrong
2019-09-27  0:14   ` Stephen Boyd
2019-09-27  6:40     ` Neil Armstrong [this message]
2019-09-27 16:38       ` Jerome Brunet
2019-09-19 10:25 ` [PATCH RFC 2/2] clk: meson: g12a: add suspend-resume hooks Neil Armstrong
2019-09-26 20:46 ` [PATCH RFC 0/2] clk: meson: g12a: handle clock hw changes while in suspend Kevin Hilman
2019-09-27  6:38   ` Neil Armstrong

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