usb: dwc2: disable power_down on rockchip devices

[Felipe Balbi <felipe.balbi@linux.intel.com>]

Hi,

Hal Emmerich <hal@halemmerich.com> writes:

> From 04fbf78e4e569bf872f1ffcb0a6f9b89569dc913 Mon Sep 17 00:00:00 2001
> From: Hal Emmerich <hal@halemmerich.com>
> Date: Thu, 19 Jul 2018 21:48:08 -0500
> Subject: [PATCH] usb: dwc2: disable power_down on rockchip devices
>
>  The bug would let the usb controller enter partial power down,
>  which was formally known as hibernate, upon boot if nothing was plugged
>  in to the port. Partial power down couldn't be exited properly, so any
>  usb devices plugged in after boot would not be usable.
>
>  Before the name change, params.hibernation was false by default, so
>  _dwc2_hcd_suspend() would skip entering hibernation. With the
>  rename, _dwc2_hcd_suspend() was changed to use  params.power_down
>  to decide whether or not to enter partial power down.
>
>  Since params.power_down is non-zero by default, it needs to be set
>  to 0 for rockchip devices to restore functionality.
>
>  This bug was reported in the linux-usb thread:
>  REGRESSION: usb: dwc2: USB device not seen after boot
>
>  The commit that caused this regression is:
>  6d23ee9caa6790aea047f9aca7f3c03cb8d96eb6
>
> Signed-off-by: Hal Emmerich <hal@halemmerich.com>
> ---
>  drivers/usb/dwc2/params.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
> index f03e41879224..492607adc506 100644
> --- a/drivers/usb/dwc2/params.c
> +++ b/drivers/usb/dwc2/params.c
> @@ -82,6 +82,7 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg)
>         p->host_perio_tx_fifo_size = 256;
>         p->ahbcfg = GAHBCFG_HBSTLEN_INCR16 <<
>                 GAHBCFG_HBSTLEN_SHIFT;
> +       p->power_down = 0;
>  }
>
>  static void dwc2_set_ltq_params(struct dwc2_hsotg *hsotg)

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