From: Ulf Hansson <ulf.hansson@stericsson.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Sebastian Rasmussen <sebras@gmail.com>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Lee Jones <lee.jones@linaro.org>
Subject: Re: [PATCH] mmc: mmci: Improve runtime PM support
Date: Mon, 24 Oct 2011 13:48:06 +0200 [thread overview]
Message-ID: <4EA55076.2010701@stericsson.com> (raw)
In-Reply-To: <20111024101416.GK9893@n2100.arm.linux.org.uk>
>> Could you maybe elaborate a bit of how the power is controlled in the
>> ARM dev boards? Would it be possible to control such a switch in "GPIO"
>> manner instead? For example via the vdd_handler or similar?
>>
>> I will also think if and see if is feasible to re-design and see if this
>> hole feature can be controlled by the variant struct instead. My feeling
>> is although it can be kind of messy. But let's see...
>
> The MCIPWR register contains two bits to control _the_ _power_ _state_.
> See Table A-4: the MCIPWR signal. See section 2.2.2. See section 3.3.1.
>
> The MCIPWR signal controls the external power switch. This is the only
> signal for it. This is the only connection for it. There is no other
> control form for this power switch.
>
Then we are only left to use the variant struct I believe. In principle,
a flag in the variant struct, could indicate whether it is OK to disable
the vcore regulator and thus clear the MCIPWR when doing runtime_suspend.
How do you feel about this kind of approach to find a solution?
BR
Ulf Hansson
WARNING: multiple messages have this Message-ID (diff)
From: ulf.hansson@stericsson.com (Ulf Hansson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: mmci: Improve runtime PM support
Date: Mon, 24 Oct 2011 13:48:06 +0200 [thread overview]
Message-ID: <4EA55076.2010701@stericsson.com> (raw)
In-Reply-To: <20111024101416.GK9893@n2100.arm.linux.org.uk>
>> Could you maybe elaborate a bit of how the power is controlled in the
>> ARM dev boards? Would it be possible to control such a switch in "GPIO"
>> manner instead? For example via the vdd_handler or similar?
>>
>> I will also think if and see if is feasible to re-design and see if this
>> hole feature can be controlled by the variant struct instead. My feeling
>> is although it can be kind of messy. But let's see...
>
> The MCIPWR register contains two bits to control _the_ _power_ _state_.
> See Table A-4: the MCIPWR signal. See section 2.2.2. See section 3.3.1.
>
> The MCIPWR signal controls the external power switch. This is the only
> signal for it. This is the only connection for it. There is no other
> control form for this power switch.
>
Then we are only left to use the variant struct I believe. In principle,
a flag in the variant struct, could indicate whether it is OK to disable
the vcore regulator and thus clear the MCIPWR when doing runtime_suspend.
How do you feel about this kind of approach to find a solution?
BR
Ulf Hansson
next prev parent reply other threads:[~2011-10-24 11:48 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-21 15:25 [PATCH] mmc: mmci: Improve runtime PM support Ulf Hansson
2011-10-21 15:25 ` Ulf Hansson
2011-10-21 17:36 ` Russell King - ARM Linux
2011-10-21 17:36 ` Russell King - ARM Linux
[not found] ` <CAKnu2MrOriMzJH9NcwUivWa0cinASa6wrRf4a69si4WUs-aTrQ@mail.gmail.com>
2011-10-23 0:31 ` Sebastian Rasmussen
2011-10-23 0:31 ` Sebastian Rasmussen
2011-10-24 8:05 ` Ulf Hansson
2011-10-24 8:05 ` Ulf Hansson
2011-10-24 9:04 ` Russell King - ARM Linux
2011-10-24 9:04 ` Russell King - ARM Linux
2011-10-24 9:36 ` Ulf Hansson
2011-10-24 9:36 ` Ulf Hansson
2011-10-24 9:42 ` Russell King - ARM Linux
2011-10-24 9:42 ` Russell King - ARM Linux
2011-10-24 10:06 ` Ulf Hansson
2011-10-24 10:06 ` Ulf Hansson
2011-10-24 10:14 ` Russell King - ARM Linux
2011-10-24 10:14 ` Russell King - ARM Linux
2011-10-24 11:48 ` Ulf Hansson [this message]
2011-10-24 11:48 ` Ulf Hansson
2011-10-24 12:18 ` Linus Walleij
2011-10-24 12:18 ` Linus Walleij
2011-10-24 15:25 ` Ulf Hansson
2011-10-24 15:25 ` Ulf Hansson
2011-10-24 15:34 ` Ulf Hansson
2011-10-24 15:34 ` Ulf Hansson
2011-10-25 7:12 ` Linus Walleij
2011-10-25 7:12 ` Linus Walleij
2011-10-25 7:39 ` Ulf Hansson
2011-10-25 7:39 ` Ulf Hansson
2011-10-24 9:11 ` Sebastian Rasmussen
2011-10-24 9:11 ` Sebastian Rasmussen
2011-10-24 9:14 ` Linus Walleij
2011-10-24 9:14 ` Linus Walleij
2011-10-24 9:36 ` Russell King - ARM Linux
2011-10-24 9:36 ` Russell King - ARM Linux
2011-10-24 9:54 ` Linus Walleij
2011-10-24 9:54 ` Linus Walleij
2011-10-24 9:56 ` Russell King - ARM Linux
2011-10-24 9:56 ` Russell King - ARM Linux
2011-10-24 10:17 ` Ulf Hansson
2011-10-24 10:17 ` Ulf Hansson
2011-10-24 11:49 ` Linus Walleij
2011-10-24 11:49 ` Linus Walleij
2011-10-25 8:05 ` Adrian Hunter
2011-10-25 8:05 ` Adrian Hunter
2011-10-25 8:53 ` Linus Walleij
2011-10-25 8:53 ` Linus Walleij
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