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Message-Id: <1526932698-28285-1-git-send-email-john.stultz@linaro.org>
Date: Mon, 21 May 2018 12:58:18 -0700
From: John Stultz <john.stultz@...aro.org>
To: lkml <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
John Youn <johnyoun@...opsys.com>,
Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
Artur Petrosyan <arturp@...opsys.com>,
Grigor Tovmasyan <tovmasya@...opsys.com>,
Felipe Balbi <felipe.balbi@...ux.intel.com>,
linux-usb@...r.kernel.org
Subject: [PATCH v2] usb: dwc2: Fix HiKey regression caused by power_down feature
In 4.17-rc, commit 03ea6d6e9e1f ("usb: dwc2: Enable power down")
caused the HiKey board to not correctly handle switching between
usb-gadget and usb-host mode.
Unplugging the OTG port would result in:
[ 42.240973] dwc2 f72c0000.usb: dwc2_restore_host_registers: no host registers to restore
[ 42.249066] dwc2 f72c0000.usb: dwc2_host_exit_hibernation: failed to restore host registers
And the USB-host ports would not function.
And plugging in the OTG port, we would see:
[ 46.046557] WARNING: CPU: 3 PID: 6 at drivers/usb/dwc2/gadget.c:260 dwc2_hsotg_init_fifo+0x194/0x1a0
[ 46.055761] CPU: 3 PID: 6 Comm: kworker/u16:0 Not tainted 4.17.0-rc5-00030-ge67da8c #231
[ 46.055767] Hardware name: HiKey Development Board (DT)
[ 46.055784] Workqueue: dwc2 dwc2_conn_id_status_change
...
Thus, this patch sets the hisi params to disable the power_down
flag by default, and gets thing working again.
Cc: John Youn <johnyoun@...opsys.com>
Cc: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Cc: Artur Petrosyan <arturp@...opsys.com>
Cc: Grigor Tovmasyan <tovmasya@...opsys.com>
Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: linux-usb@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2: Use DWC2_POWER_DOWN_PARAM_NONE as suggested by Minas
---
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 f03e418..d38871c 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -70,6 +70,7 @@ static void dwc2_set_his_params(struct dwc2_hsotg *hsotg)
GAHBCFG_HBSTLEN_SHIFT;
p->uframe_sched = false;
p->change_speed_quirk = true;
+ p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
}
static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg)
--
2.7.4
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