Hi Mathias, Greg,
On Mon, Jan 19, 2015 at 02:01:12PM +0100, Maxime Ripard wrote:
> The commit 973747928514 ("usb: host: xhci-plat: add support for the Armada
> 375/38x XHCI controllers") extended the xhci-plat driver to support the Armada
> 375/38x SoCs, mostly by adding a quirk configuring the MBUS window.
>
> However, that quirk was run before the clock the controllers needs has been
> enabled. This usually worked because the clock was first enabled by the
> bootloader, and left as such until the driver is probe, where it tries to
> access the MBUS configuration registers before enabling the clock.
>
> Things get messy when EPROBE_DEFER is involved during the probe, since as part
> of its error path, the driver will rightfully disable the clock. When the
> driver will be reprobed, it will retry to access the MBUS registers, but this
> time with the clock disabled, which hangs forever.
>
> Fix this by running the quirks after the clock has been enabled by the driver.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.16+
Any chance for this to go in 3.19?
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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