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[PATCH 4.6 30/31] usb: host: ehci-tegra: Grab the correct UTMI pads reset

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4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thierry Reding <treding@nvidia.com>

commit f8a15a9650694feaa0dabf197b0c94d37cd3fb42 upstream.

There are three EHCI controllers on Tegra SoCs, each with its own reset
line. However, the first controller contains a set of UTMI configuration
registers that are shared with its siblings. These registers will only
be reset as part of the first controller's reset. For proper operation
it must be ensured that the UTMI configuration registers are reset
before any of the EHCI controllers are enabled, irrespective of the
probe order.

Commit a47cc24cd1e5 ("USB: EHCI: tegra: Fix probe order issue leading to
broken USB") introduced code that ensures the first controller is always
reset before setting up any of the controllers, and is never again reset
afterwards.

This code, however, grabs the wrong reset. Each EHCI controller has two
reset controls attached: 1) the USB controller reset and 2) the UTMI
pads reset (really the first controller's reset). In order to reset the
UTMI pads registers the code must grab the second reset, but instead it
grabbing the first.

Fixes: a47cc24cd1e5 ("USB: EHCI: tegra: Fix probe order issue leading to broken USB")
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/host/ehci-tegra.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -89,7 +89,7 @@ static int tegra_reset_usb_controller(st
 	if (!usb1_reset_attempted) {
 		struct reset_control *usb1_reset;
 
-		usb1_reset = of_reset_control_get(phy_np, "usb");
+		usb1_reset = of_reset_control_get(phy_np, "utmi-pads");
 		if (IS_ERR(usb1_reset)) {
 			dev_warn(&pdev->dev,
 				 "can't get utmi-pads reset from the PHY\n");

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[PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 11/31] bpf, perf: delay release of BPF prog after grace period Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 20/31] usb: musb: only restore devctl when session was set in backup Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 03/31] net: Dont forget pr_fmt on net_dbg_ratelimited for CONFIG_DYNAMIC_DEBUG Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 05/31] kcm: fix /proc memory leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 07/31] netem: fix a use after free Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 08/31] ipmr/ip6mr: Initialize the last assert time of mfc entries. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 04/31] sit: correct IP protocol used in ipip6_err Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 25/31] usb: xhci-plat: properly handle probe deferral for devm_clk_get() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 01/31] net_sched: fix pfifo_head_drop behavior vs backlog Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 23/31] usb: musb: host: correct cppi dma channel for isoch transfer Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 10/31] sock_diag: do not broadcast raw socket destruction Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 18/31] usb: quirks: Fix sorting Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 27/31] xhci: Fix handling timeouted commands on hosts in weird states. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 16/31] crypto: user - re-add size check for CRYPTO_MSG_GETALG Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 30/31] usb: host: ehci-tegra: Grab the correct UTMI pads reset Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 19/31] usb: quirks: Add no-lpm quirk for Acer C120 LED Projector Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 21/31] usb: musb: Stop bulk endpoint while queue is rotated Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 14/31] crypto: vmx - Increase priority of aes-cbc cipher Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 26/31] USB: xhci: Add broken streams quirk for Frescologic device id 1009 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 02/31] act_ipt: fix a bind refcnt leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 31/31] usb: dwc3: exynos: Fix deferred probing storm. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 17/31] USB: uas: Fix slave queue_depth not being set Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 13/31] AX.25: Close socket connection on session completion Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 12/31] neigh: Explicitly declare RCU-bh read side critical section in neigh_xmit() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 28/31] USB: mos7720: delete parport Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 15/31] crypto: ux500 - memmove the right size Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 22/31] usb: musb: Ensure rx reinit occurs for shared_fifo endpoints Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Heinz Diehl <htd+ml@fritha.org> - 2016-07-07 14:50 +0200
    Re: [PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 21:20 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Guenter Roeck <linux@roeck-us.net> - 2016-07-07 15:40 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2016-07-08 05:50 +0200
    Re: [PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-09 07:20 +0200

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