This is a note to let you know that I've just added the patch titled

usb: dwc2: disable power_down on Amlogic devices

to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From cc10ce0c51b13d1566d0ec1dcb472fb86330b391 Mon Sep 17 00:00:00 2001

From: Martin Blumenstingl martin.blumenstingl@googlemail.com Date: Sun, 9 Dec 2018 20:01:29 +0100 Subject: usb: dwc2: disable power_down on Amlogic devices

Disable power_down by setting the parameter to DWC2_POWER_DOWN_PARAM_NONE. This fixes a problem on various Amlogic Meson SoCs where USB devices are only recognized when plugged in before booting Linux. A hot-plugged USB device was not detected even though the device got power (my USB thumb drive for example has an LED which lit up).

A similar fix was implemented for Rockchip SoCs in commit c216765d3a1def ("usb: dwc2: disable power_down on rockchip devices"). That commit suggests that a change in the dwc2 driver is the cause because the default value for the "hibernate" parameter (which then got renamed to "power_down" to support other modes) was changed in the v4.17 merge window with: commit 6d23ee9caa6790 ("Merge tag 'usb-for-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-testing").

Cc: stable@vger.kernel.org # 4.19 Acked-by: Minas Harutyunyan hminas@synopsys.com Suggested-by: Christian Hewitt christianshewitt@gmail.com Signed-off-by: Martin Blumenstingl martin.blumenstingl@googlemail.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.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 266157ae179a..24ff5f21cb25 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -118,6 +118,7 @@ static void dwc2_set_amlogic_params(struct dwc2_hsotg *hsotg) p->phy_type = DWC2_PHY_TYPE_PARAM_UTMI; p->ahbcfg = GAHBCFG_HBSTLEN_INCR8 << GAHBCFG_HBSTLEN_SHIFT; + p->power_down = DWC2_POWER_DOWN_PARAM_NONE; }

static void dwc2_set_amcc_params(struct dwc2_hsotg *hsotg)