From e7f2f81153633b18ba592786d55126f4fa198c47 Mon Sep 17 00:00:00 2001 From: SolidHal Date: Mon, 25 Nov 2019 11:39:24 +0800 Subject: [PATCH] usb: dwc2: disable power_down on rockchip devices [ Upstream commit c216765d3a1defda5e7e2dabd878f99f0cd2ebf2 ] 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: SolidHal Acked-by: Minas Harutyunyan Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin Signed-off-by: Yang Yingliang --- 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 dff2c6e8d797..a93415f33bf3 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -88,6 +88,7 @@ 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) -- GitLab