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From: Kevin Hilman <>
To: Neil Armstrong <>,,,
	Neil Armstrong <>,,,
Subject: Re: [PATCH RFC 0/2] clk: meson: g12a: handle clock hw changes while in suspend
Date: Thu, 26 Sep 2019 13:46:29 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Neil Armstrong <> writes:

> This serie aime to support when the suspend/resume firmware alters the
> clock tree, leading to an incorrect representation of the clock tree
> after a resume from suspend-to-mem.
> For the Amlogic G12A/G12B/SM1 case, the SCPI firmware handling suspend
> alters the CPU clock tree in various ways.
> Since we know which part of the tree is possibly altered, we introduce here
> the clk_invalidate_rate() function that will rebuild the tree from the
> hardware registers in case parents and dividers have changed.
> Finally we call clk_invalidate_rate() from a new resume callback to refresh
> the CPU clock tree after a resume.
> With the clock tree refreshed, CCF can now handle the new clock tree
> configuration and avoid crashing the system on further DVFS set_rates.

For clarification, does this series work without the other proposed
fixes[1]?  or is this dependent on that?



linux-amlogic mailing list

  parent reply	other threads:[~2019-09-26 20:46 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
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 ` Kevin Hilman [this message]
2019-09-27  6:38   ` [PATCH RFC 0/2] clk: meson: g12a: handle clock hw changes while in suspend Neil Armstrong

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