usb: dwc2: disable power_down on rockchip devices

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

 From 04fbf78e4e569bf872f1ffcb0a6f9b89569dc913 Mon Sep 17 00:00:00 2001
From: Hal Emmerich <redacted>
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 <redacted>

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

quoted hunk

---
  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