From: Neil Armstrong <narmstrong@baylibre.com>
To: Stephen Boyd <sboyd@kernel.org>,
jbrunet@baylibre.com, mturquette@baylibre.com
Cc: linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC 1/2] clk: introduce clk_invalidate_rate()
Date: Fri, 27 Sep 2019 08:40:42 +0200 [thread overview]
Message-ID: <8486dec0-8aea-ea39-2a52-7347a01c5c40@baylibre.com> (raw)
In-Reply-To: <20190927001425.DFDC7207FF@mail.kernel.org>
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 <narmstrong@baylibre.com>
>> ---
>
> 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.
Neil
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next prev parent 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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