Dear Andrew Lunn, On Wed, 26 Mar 2014 14:55:11 +0100, Andrew Lunn wrote:
> I _guess_ the real problem here is the power supply. It cannot supply > enough power to get all the drives spinning if they all start at the > same time. Many of the multi-bay NAS boxes have GPIO lines which are > used to individually power up each driver in a staggered way. The QNAP > kernel patch is doing something similar. However in its current form > it cannot be accepted. This delay needs to be made conditional and > only applied on hardware with a weak power supply. > > I will take a look at the code and see how the platform can pass a > flag to the driver that it needs to stagger port initialization. The Marvell LSP code also has some changes into the core ATA to implement staggered disk spin-up. I believe they are probably visible in the publicly visible LSP code at https://github.com/yellowback/ubuntu-precise-armadaxp/, but I haven't checked in detail. If you're interested, I can probably dig the LSP patch that does that. Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140326151702.69a38c16@skate
