From ca8b03324877e1804161fd4e0100d49f03ad9fce Mon Sep 17 00:00:00 2001 From: Chen Yu Date: Mon, 23 Jan 2017 15:00:18 -0800 Subject: usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220 The Hi6220's usb controller is limited in that it does not support "Split Transactions", so it does not support communicating with low-speed and full-speed devices behind a high-speed hub. Thus it requires a quirk so that we can manually drop the usb speed when low/full-speed are attached, and bump back to high speed when they are removed. Cc: Wei Xu Cc: Guodong Xu Cc: Amit Pundir Cc: Rob Herring Cc: John Youn Cc: Douglas Anderson Cc: Chen Yu Cc: Vardan Mikayelyan Cc: Kishon Vijay Abraham I Cc: Felipe Balbi Cc: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org Signed-off-by: Chen Yu [jstultz: Reworked to simplify the patch, and made commit log to be more specific about the issue] Signed-off-by: John Stultz Signed-off-by: John Youn Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/params.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/usb/dwc2/params.c') diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index 620b02723f0d..8e5039e2d3fc 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -68,6 +68,7 @@ static void dwc2_set_his_params(struct dwc2_hsotg *hsotg) p->ahbcfg = GAHBCFG_HBSTLEN_INCR16 << GAHBCFG_HBSTLEN_SHIFT; p->uframe_sched = false; + p->change_speed_quirk = true; } static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg) -- cgit v1.2.3