[U-Boot] [PATCH v2] sunxi: A64: OHCI: prevent turning off shared USB clock

[Marek Vasut]

On 07/05/2018 01:57 AM, Andre Przywara wrote:
> On the A64 the clock for the first USB controller is actually the parent
> of the clock for the second controller, so turning them off in that order
> makes the system hang.
> Fix this by only turning off *both* clocks when the *last* OHCI controller
> is brought down. This covers the case when only one controller is used.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
> Hi,
> 
> as requested by Marek, a second version to address the problem of only
> one controller instantiated. I tested all cases:
> - only [EO]HCI1 enabled (current U-Boot master DT)
> - both controllers enabled (mainline Linux DT)
> - only [EO]HCI0 enabled (DT hack)
> In all cases the system booted without hanging, plus I confirmed that
> the USB clocks were disabled in all cases (early in the kernel).
> 
> Cheers,
> Andre.
> 
> P.S. I found the MMC0, EMAC and USB-OTG AHB gates and resets still running,
> but this is an unrelated issue and no regression. Just in case somebody
> feels bored ...

Applied, thanks for all the effort you put into this .

-- 
Best regards,
Marek Vasut