Hi,
Sorry for the late respones.
On Monday, December 19, 2011, Ulf Hansson wrote:
> Guennadi Liakhovetski wrote:
> > On Wed, 14 Dec 2011, Rafael J. Wysocki wrote:
> >
> >> On Wednesday, December 14, 2011, Ulf Hansson wrote:
> >
> > [snip]
> >
> >>> 2.
> >>> When executing mmc/sd commands/reque
Guennadi Liakhovetski wrote:
On Wed, 14 Dec 2011, Rafael J. Wysocki wrote:
On Wednesday, December 14, 2011, Ulf Hansson wrote:
[snip]
2.
When executing mmc/sd commands/requests the host must always be claimed
(and thus the host is always enabled).
Why? Why cannot we save some power betwe
On Wed, 14 Dec 2011, Rafael J. Wysocki wrote:
> On Wednesday, December 14, 2011, Ulf Hansson wrote:
[snip]
> > 2.
> > When executing mmc/sd commands/requests the host must always be claimed
> > (and thus the host is always enabled).
Why? Why cannot we save some power between IO operations - if
On Wednesday, December 14, 2011, Ulf Hansson wrote:
>
> >> You have a point. But I am not convinced. :-)
> >>
> >> Some host drivers already make use of autosuspend. I think this is most
> >> straightforward solution to this problem right now.
> >
> > The problem is not about _when_ to suspend (
On Wed, Dec 14, 2011 at 11:28 AM, Rafael J. Wysocki wrote:
> On Wednesday, December 14, 2011, Linus Walleij wrote:
>> But this delta is dependent on a lot of stuff that only the platform
>> knows, like nominal CPU frequency, bus speed etc, so certainly the
>> platform must be able to modify that
You have a point. But I am not convinced. :-)
Some host drivers already make use of autosuspend. I think this is most
straightforward solution to this problem right now.
The problem is not about _when_ to suspend (which autosuspend is about),
but _what_ _state_ to go when suspended. That's
On Wednesday, December 14, 2011, Linus Walleij wrote:
> On Wed, Dec 14, 2011 at 10:00 AM, Ulf Hansson
> wrote:
> > Guennadi Liakhovetski wrote:
>
> > Using PM QoS as you propose, might prevent some hosts from doing
> > runtime_suspend|resume completely and thus those might not fulfill power
> > c
On Wednesday, December 14, 2011, Ulf Hansson wrote:
> Guennadi Liakhovetski wrote:
> > Hi Ulf
> >
> > On Tue, 13 Dec 2011, Ulf Hansson wrote:
> >
> >> Guennadi Liakhovetski wrote:
> >>> Some MMC hosts implement a fine-grained runtime PM, whereby they
> >>> runtime-suspend and -resume the host int
On Wed, Dec 14, 2011 at 10:00 AM, Ulf Hansson
wrote:
> Guennadi Liakhovetski wrote:
> Using PM QoS as you propose, might prevent some hosts from doing
> runtime_suspend|resume completely and thus those might not fulfill power
> consumption requirements instead. I do not think we can take this dec
Guennadi Liakhovetski wrote:
Hi Ulf
On Tue, 13 Dec 2011, Ulf Hansson wrote:
Guennadi Liakhovetski wrote:
Some MMC hosts implement a fine-grained runtime PM, whereby they
runtime-suspend and -resume the host interface on each transfer. This can
negatively affect performance, if the user was tr
On Tuesday, December 13, 2011, Guennadi Liakhovetski wrote:
> Hi Ulf
>
> On Tue, 13 Dec 2011, Ulf Hansson wrote:
>
> > Guennadi Liakhovetski wrote:
> > > Some MMC hosts implement a fine-grained runtime PM, whereby they
> > > runtime-suspend and -resume the host interface on each transfer. This ca
Hi Ulf
On Tue, 13 Dec 2011, Ulf Hansson wrote:
> Guennadi Liakhovetski wrote:
> > Some MMC hosts implement a fine-grained runtime PM, whereby they
> > runtime-suspend and -resume the host interface on each transfer. This can
> > negatively affect performance, if the user was trying to transfer da
Guennadi Liakhovetski wrote:
Some MMC hosts implement a fine-grained runtime PM, whereby they
runtime-suspend and -resume the host interface on each transfer. This can
negatively affect performance, if the user was trying to transfer data
blocks back-to-back. This patch adds a PM QoS constraint t
Some MMC hosts implement a fine-grained runtime PM, whereby they
runtime-suspend and -resume the host interface on each transfer. This can
negatively affect performance, if the user was trying to transfer data
blocks back-to-back. This patch adds a PM QoS constraint to avoid such a
throughput reduc
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