linux-kernel - Re: [PATCH v2 5/5] regulator: tps65090: Make FETs more reliable by adding retries

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Message-ID: <CAD=FV=V+xpMEFVqH2Afo8XmCJsUPU2Y8xcmR3rwi+V25KKx8DQ@mail.gmail.com>
Date:	Wed, 16 Apr 2014 14:25:45 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Simon Glass <sjg@...omium.org>
Cc:	Anton Vorontsov <anton@...msg.org>,
	Olof Johansson <olof@...om.net>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	AJAY KUMAR RAMAKRISHNA SHYMALAMMA <ajaykumar.rs@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Michael Spang <spang@...omium.org>,
	Sean Paul <seanpaul@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] regulator: tps65090: Make FETs more reliable by
 adding retries

Simon,

On Wed, Apr 16, 2014 at 1:50 PM, Simon Glass <sjg@...omium.org> wrote:
>> +#define MAX_CTRL_READ_TRIES    5
>> +#define MAX_FET_ENABLE_TRIES   1000
>
> Gosh that is a lot of tries - should we maybe give up sooner?

That's actually a squash of a recent patch.  See
<https://chromium-review.googlesource.com/189239>.  I've specifically
seen at least one case on my device where it needed 888 retries at
bootup!

...on my really old Chromebook, it seems to get into a bad state if it
sits on my desk for a long time.  After I use it a bit it rarely needs
more than 10 retries.

-Doug
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