From: Laxman Dewangan <ldewangan@nvidia.com>
To: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn@kryo.se>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Liam Girdwood <lgirdwood@gmail.com>,
Stephen Warren <swarren@wwwdotorg.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Gandhar Dighe <gdighe@nvidia.com>,
Stuart Yates <syates@nvidia.com>
Subject: Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based on platform behavior
Date: Fri, 1 Apr 2016 01:18:23 +0530 [thread overview]
Message-ID: <56FD7F07.7010404@nvidia.com> (raw)
In-Reply-To: <20160331192227.GU2350@sirena.org.uk>
On Friday 01 April 2016 12:52 AM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Fri, Apr 01, 2016 at 12:29:05AM +0530, Laxman Dewangan wrote:
>> On Friday 01 April 2016 12:29 AM, Mark Brown wrote:
>> But here is the stuff without typo ;-)
>> Device supports 5mV/us and 100mV/us which is not in observed value.
> So why doesn't the device end up configuring 100mV/us when asked for
> 50mv/us? That's reasonably expected - the configured ramp rate is a
> maximum rate given that this is used to limit inrush current.
>
>
We did this to adjust device configuration to nearest higher side but
this is not working well on some of cases.
On same device, DCDC (SD) rails support 4 ramp configurations,
13.75mV/us, 27.5mV/us, 55mV/us and 100mV/us.
HW team measured the ramp time at 7.5mV/us when device configured at
27.5mV/uS.
So as per above, it will be adjusted to 13.75mV/us (nearest higher side)
for device configuration but this device need to configure for 27.5mV/us.
next prev parent reply other threads:[~2016-03-31 19:48 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 14:40 [PATCH 1/2] regulator: DT: Add support to scale ramp delay based on platform behavior Laxman Dewangan
2016-02-29 14:40 ` Laxman Dewangan
[not found] ` <1456756829-2277-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-02-29 14:40 ` [PATCH 2/2] regulator: " Laxman Dewangan
2016-02-29 14:40 ` Laxman Dewangan
2016-02-29 17:47 ` [PATCH 1/2] regulator: DT: " Bjorn Andersson
2016-02-29 17:47 ` Bjorn Andersson
2016-03-01 2:23 ` Mark Brown
2016-03-01 2:23 ` Mark Brown
[not found] ` <20160301022326.GC18327-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-01 3:48 ` Laxman Dewangan
2016-03-01 3:48 ` Laxman Dewangan
[not found] ` <56D5111E.6090606-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-02 3:38 ` Mark Brown
2016-03-02 3:38 ` Mark Brown
2016-03-02 3:35 ` Laxman Dewangan
2016-03-02 3:35 ` Laxman Dewangan
[not found] ` <56D65F7E.3090907-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-02 4:35 ` Mark Brown
2016-03-02 4:35 ` Mark Brown
2016-03-02 6:12 ` Laxman Dewangan
2016-03-02 6:12 ` Laxman Dewangan
2016-03-15 13:41 ` Laxman Dewangan
2016-03-15 13:41 ` Laxman Dewangan
[not found] ` <56E81103.8010903-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-15 14:48 ` Mark Brown
2016-03-15 14:48 ` Mark Brown
2016-03-16 11:30 ` Laxman Dewangan
2016-03-16 11:30 ` Laxman Dewangan
2016-03-19 4:31 ` Bjorn Andersson
2016-03-19 8:35 ` Laxman Dewangan
2016-03-30 13:29 ` Laxman Dewangan
2016-03-30 18:16 ` Mark Brown
2016-03-31 7:06 ` Laxman Dewangan
2016-03-31 16:51 ` Mark Brown
[not found] ` <20160331165145.GF2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-31 17:13 ` Laxman Dewangan
2016-03-31 17:13 ` Laxman Dewangan
[not found] ` <56FD5A9F.5050001-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-31 17:47 ` Mark Brown
2016-03-31 17:47 ` Mark Brown
[not found] ` <20160331174741.GO2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-31 17:47 ` Laxman Dewangan
2016-03-31 17:47 ` Laxman Dewangan
2016-03-31 18:31 ` Mark Brown
[not found] ` <20160331183130.GR2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-31 18:31 ` Laxman Dewangan
2016-03-31 18:31 ` Laxman Dewangan
2016-03-31 18:45 ` Mark Brown
[not found] ` <20160331184553.GS2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-31 18:39 ` Laxman Dewangan
2016-03-31 18:39 ` Laxman Dewangan
2016-03-31 18:59 ` Mark Brown
[not found] ` <20160331185945.GT2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-31 18:59 ` Laxman Dewangan
2016-03-31 18:59 ` Laxman Dewangan
2016-03-31 19:22 ` Mark Brown
2016-03-31 19:48 ` Laxman Dewangan [this message]
[not found] ` <56FD7F07.7010404-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-31 20:39 ` Mark Brown
2016-03-31 20:39 ` Mark Brown
[not found] ` <20160331203942.GV2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-01 7:15 ` Laxman Dewangan
2016-04-01 7:15 ` Laxman Dewangan
2016-04-01 16:11 ` Mark Brown
[not found] ` <20160401161121.GZ2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-05 8:01 ` Laxman Dewangan
2016-04-05 8:01 ` Laxman Dewangan
[not found] ` <570370E5.3070901-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-12 1:02 ` Mark Brown
2016-04-12 1:02 ` Mark Brown
2016-04-12 13:29 ` Laxman Dewangan
[not found] ` <570CF822.4050002-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-13 6:53 ` Mark Brown
2016-04-13 6:53 ` Mark Brown
2016-04-19 10:01 ` Laxman Dewangan
2016-04-19 10:55 ` Mark Brown
[not found] ` <20160419105545.GT3217-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-19 10:56 ` Laxman Dewangan
2016-04-19 10:56 ` Laxman Dewangan
2016-04-19 15:47 ` Mark Brown
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