lkml.org 
[lkml]   [2019]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH RFC 0/2] clk: meson: g12a: handle clock hw changes while in suspend
From
Date
On 26/09/2019 22:46, Kevin Hilman wrote:
> Neil Armstrong <narmstrong@baylibre.com> 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?
>
> Kevin
>
> [1] https://lore.kernel.org/linux-amlogic/20190919093627.21245-1-narmstrong@baylibre.com/
>

These are independent, but you'll need both to have suspend/resume fully working.

Neil

\
 
 \ /
  Last update: 2019-09-27 08:39    [W:0.070 / U:2.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site