linux-kernel - Re: [linux-sunxi] [PATCH 3/3] mmc: sunxi: use controller automatic clock gating.

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Date:	Wed, 12 Aug 2015 16:57:27 +0200
From:	Olliver Schinagl <oliver+list@...inagl.nl>
To:	hramrach@...il.com
CC:	Hans de Goede <hdegoede@...hat.com>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	David Lanzendörfer 
	<david.lanzendoerfer@....ch>, Chen-Yu Tsai <wens@...e.org>,
	Arnd Bergmann <arnd@...db.de>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [linux-sunxi] [PATCH 3/3] mmc: sunxi: use controller automatic
 clock gating.

The thing is, I never saw the prints in my console (i assume that it 
prints on the console by default with earlyprintk/debug stuff enabled as 
per sunxi-usual)?

P.S. what I do as a basic test, is on our very very minimal empty debian 
image (think < 150 mb) i do a apt-get build-essential that installs 
about 150mb worth of packages.

Without these patches, everything works as before. All packages 
successfully installed. I can do more intense testing later, but I 
figured that this is pretty intense.

Olliver

On 12-08-15 15:37, Michal Suchanek wrote:
> On 12 August 2015 at 15:19, Olliver Schinagl <oliver+list@...inagl.nl> wrote:
>> Hey,
>>
>> On 12-08-15 14:35, Hans de Goede wrote:
>>> Hi,
>>>
>>> On 12-08-15 14:23, Michal Suchanek wrote:
>>>> When core does not set the MMC_QUIRK_BROKEN_CLK_GATING flag enable
>>>> automatic hardware controlled clock gating on the mmc interface.
>>>>
>>>> Signed-off-by: Michal Suchanek <hramrach@...il.com>
>>>
>>> In general this looks good, but I wonder how intensively this has
>>> been tested ?
>> It doesn't matter actually, it took some time longer, but the mmc still
>> craps out even with Michal's 3 patches. I'll revert hans's earlier patch
>> again and do a bit more extensive testing.
> Does the oclk switch timeout even after 750ms?
>
> In some earlier tests I tried to enable/disable the clock repeatedly
> when it failed but it seemed to have little effect on the total time
> it took to disable the clock in the end.
>
> Maybe it would be worh trying to set the timeout to some insanely long
> value and test stability with that. I picked 750 as around twice the
> maximum time it ever took on my board.
>
> Thanks
>
> Michal
>

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