On Tue, Jun 23, 2015 at 10:19:10AM +0200, Hans de Goede wrote: > Hi, > > On 23-06-15 09:16, Maxime Ripard wrote: > >On Mon, Jun 22, 2015 at 10:28:16AM +0200, Hans de Goede wrote: > >>Hi, > >> > >>On 22-06-15 02:30, Julian Calaby wrote: > >>>Hi Hans, > >>> > >>>On Sun, Jun 21, 2015 at 1:40 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > >>>>u-boot will have turned on the power to the usb host ports, so mark them > >>>>as regulator-boot-on, this stops the power on the ports from temporarily > >>>>getting turned off during boot, causing issues with e.g. usb powered > >>>>harddisks. > >>> > >>>Stupid question: shouldn't u-boot set this property? > >> > >>We could make u-boot set this property but that will require a lot of code on > >>u-boot's side which is simply not there atm. And traditionally this property > >>is is simply a part of the dts files as shipped with the kernel. > > > >What happens if the property is set but the regulator is not actually > >enabled? > > Then its gets enabled when the regulator loads, so assuming that the usb driver > is enabled in the kernel config 0.5 (built-in) - 3 (module) seconds earlier then > it otherwise would. Ok, perfect then. > This is not a problem since usb-ports are normally always powered anyways That might be true using mainline u-boot, but might not be on other bootloaders, hence why I asked that. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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