linux-kernel - Re: [PATCH] regulator: ab8500: Fix get

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Date:	Mon, 15 Apr 2013 16:50:45 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Bengt Jönsson <bengt.g.jonsson@...ricsson.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Lee Jones <lee.jones@...aro.org>,
	Yvan FILLION <yvan.fillion@...ricsson.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: ab8500: Fix get_mode for shared mode regulators

> My understanding is for shared mode regulators:
> It can be in LP mode only when *BOTH* are in LP mode.
> If only one of the regulator in HP mode, then *BOTH* should be in HP mode.
> Did I misunderstand something?

Let me put this issue this way:

Current code behavior:
get_mode() returns IDLE if only one lp_mode_req flag is true, but mode
register value is HP.

AB8540_LDO_ANAMIC1      AB8540_LDO_ANAMIC2      mode register
get_mode() returns
lp_mode_req=true        lp_mode_req=true        HP
REGULATOR_MODE_NORMAL
lp_mode_req=true        lp_mode_req=false       HP
REGULATOR_MODE_IDLE
lp_mode_req=false       lp_mode_req=true        HP
REGULATOR_MODE_IDLE
lp_mode_req=false       lp_mode_req=false       LP
REGULATOR_MODE_IDLE

with this path:
mode register value is consistent with get_mode().

AB8540_LDO_ANAMIC1      AB8540_LDO_ANAMIC2      mode register
get_mode() returns
lp_mode_req=true        lp_mode_req=true        HP
REGULATOR_MODE_NORMAL
lp_mode_req=true        lp_mode_req=false       HP
REGULATOR_MODE_NORMAL
lp_mode_req=false       lp_mode_req=true        HP
REGULATOR_MODE_NORMAL
lp_mode_req=false       lp_mode_req=false       LP
REGULATOR_MODE_IDLE
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