phy: rockchip-inno-usb2: increase otg sm work first schedule time
authorWilliam Wu <william.wu@rock-chips.com>
Fri, 2 Jun 2017 03:20:24 +0000 (11:20 +0800)
committerKishon Vijay Abraham I <kishon@ti.com>
Tue, 6 Jun 2017 09:20:23 +0000 (14:50 +0530)
commit5a74a8b74233f0e3c018d4e1c2a52e9393605f47
tree8cf1cd96bf7df76bdea74d0b9ecea395b85a27e3
parentfbbe98cd44508def1c6b7f98d5dc676d23bc9031
phy: rockchip-inno-usb2: increase otg sm work first schedule time

In rockchip-inno-usb2 phy driver, we use otg_sm_work to
dynamically manage power consumption for phy otg-port.
If the otg-port works as peripheral mode and does not
communicate with usb host, we will suspend phy.

But once suspend phy, the phy no longer has any internal
clock running, include the utmi_clk which supplied for
usb controller. So if we suspend phy before usb controller
init, it will cause usb controller fail to initialize.

Specifically, without this patch, the observed order is:
 1. unplug usb cable
 2. start system, do dwc2 controller probe
 3. dwc2_lowlevel_hw_enable()
    - phy_init()
     - rockchip_usb2phy_init()
      - schedule otg_sm_work after 2s
        put phy in suspend, and close utmi_clk
 4. dwc2_hsotg_udc_start() - fail to initialize the usb core

Generally, dwc2_hsotg_udc_start() can be called within 5s
after start system on Rockchip platform, so we increase the
the first schedule delay time to 6s for otg_sm_work afer usb
controller calls phy_init(), this can make sure that the usb
controller completes initialization before phy enter suspend.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
drivers/phy/rockchip/phy-rockchip-inno-usb2.c