From: Doug Anderson <dianders@chromium.org>
To: Mark Brown <broonie@kernel.org>
Cc: David Collins <collinsd@codeaurora.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-msm@vger.kernel.org,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
devicetree@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
Stephen Boyd <sboyd@kernel.org>
Subject: Re: [PATCH v3 1/2] regulator: dt-bindings: add QCOM RPMh regulator bindings
Date: Wed, 30 May 2018 09:31:55 -0700 [thread overview]
Message-ID: <CAD=FV=UpWEMSPUYOHmLQ0g_mF990kwn4_zm=ZCNttLKZiz7i=Q@mail.gmail.com> (raw)
In-Reply-To: <20180530161311.GT6920@sirena.org.uk>
Hi,
On Wed, May 30, 2018 at 9:13 AM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, May 30, 2018 at 09:09:02AM -0700, Doug Anderson wrote:
>> On Wed, May 30, 2018 at 9:07 AM, Mark Brown <broonie@kernel.org> wrote:
>
>> > It needs something to tell it what the new voltage to set is.
>
>> The regulator driver has its own cache of what voltage was most
>> recently requested by Linux. It can use that, can't it?
>
> If we're just going to use the most recently set voltage then hopefully
> the hardware already knew that, and it might not be the lowest available
> voltage if the last consumer to get turned off was holding the voltage
> higher.
To circle back to the original point: the problem is that (IMHO) the
hardware is doing the wrong thing by still counting Linux's vote for a
voltage even though Linux also voted that the regulator should be
disabled. So basically we're working around the hardware by
pretending to vote for a dummy lower voltage whenever Linux wants the
regulator disabled. From Linux's point of view everything works as
normal--we just tell the hardware a falsehood so it doesn't count our
vote for a voltage while the regulator is disabled.
-Doug
next prev parent reply other threads:[~2018-05-30 16:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-12 2:28 [PATCH v3 0/2] regulator: add QCOM RPMh regulator driver David Collins
2018-05-12 2:28 ` [PATCH v3 1/2] regulator: dt-bindings: add QCOM RPMh regulator bindings David Collins
2018-05-17 21:22 ` Doug Anderson
2018-05-18 0:16 ` David Collins
2018-05-18 1:01 ` Doug Anderson
2018-05-19 0:46 ` David Collins
2018-05-21 18:01 ` Doug Anderson
2018-05-22 0:00 ` David Collins
2018-05-22 16:43 ` Doug Anderson
2018-05-22 16:55 ` Mark Brown
2018-05-22 22:46 ` David Collins
2018-05-23 0:08 ` Doug Anderson
2018-05-23 1:19 ` David Collins
2018-05-23 5:10 ` Doug Anderson
2018-05-23 8:29 ` Mark Brown
2018-05-23 15:23 ` Doug Anderson
2018-05-23 15:40 ` Mark Brown
2018-05-23 15:50 ` Doug Anderson
2018-05-23 15:56 ` Mark Brown
2018-05-30 5:30 ` Doug Anderson
2018-05-30 9:37 ` Mark Brown
2018-05-30 14:46 ` Doug Anderson
2018-05-30 15:02 ` Mark Brown
2018-05-30 15:34 ` Doug Anderson
2018-05-30 15:48 ` Mark Brown
2018-05-30 16:06 ` Doug Anderson
2018-05-30 16:07 ` Mark Brown
2018-05-30 16:09 ` Doug Anderson
2018-05-30 16:13 ` Mark Brown
2018-05-30 16:31 ` Doug Anderson [this message]
2018-05-30 16:36 ` Mark Brown
2018-05-30 16:41 ` Doug Anderson
2018-05-30 16:59 ` Mark Brown
2018-05-18 22:24 ` Rob Herring
2018-05-12 2:28 ` [PATCH v3 2/2] regulator: add QCOM RPMh regulator driver David Collins
2018-05-17 21:23 ` Doug Anderson
2018-05-18 0:16 ` David Collins
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAD=FV=UpWEMSPUYOHmLQ0g_mF990kwn4_zm=ZCNttLKZiz7i=Q@mail.gmail.com' \
--to=dianders@chromium.org \
--cc=broonie@kernel.org \
--cc=collinsd@codeaurora.org \
--cc=devicetree@vger.kernel.org \
--cc=lgirdwood@gmail.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=rnayak@codeaurora.org \
--cc=robh+dt@kernel.org \
--cc=sboyd@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).