usb: dwc2: disable power_down on rockchip devices

[Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>]

On 9/28/2018 7:05 AM, Hal Emmerich wrote:
>  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>

Acked-by: Minas Harutyunyan <hminas@synopsys.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)
> --
> 2.11.0
> 
>