On 7/20/2018 7:25 AM, Hal Emmerich wrote:
> From 04fbf78e4e569bf872f1ffcb0a6f9b89569dc913 Mon Sep 17 00:00:00 2001
> From: Hal Emmerich <h...@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 <h...@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)
> --
> 2.11.0
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majord...@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
Acked-by: Minas Harutyunyan <hmi...@synopsys.com>
