Re: [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb)

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On 6/8/2012 3:11 AM, Paul Walmsley wrote:
On Thu, 7 Jun 2012, Cousson, Benoit wrote:

Indeed, what I did not mention is that potentially the whole device init
should be done ondemand as well. Meaning the whole hwmod setup phase should be
done only when the driver will probe the device.

That means if no driver exists for an IP block, or if the driver isn't
using PM runtime, the IP block won't be reset.  And somehow we still are
missing drivers in mainline.  We also still have drivers that aren't yet
PM runtime converted.

No the point is still the same as before. You let the drivers do the job if they are there, and then do a pass at very late time during the boot process to handle the ones that were not probed by any driver.

At least you will avoid the enable -> reset -> idle -> enable sequence we are doing right now for most of the active drivers when it is not necessary.

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