USB: Allow skipping device resume during system resume

Some buses would like to keep their devices in suspend state during system
resume.  For example HSIC controller driver prevent system suspend when
HSIC device is active.  If this device is resumed, during system resume
HSIC controller acquire wake lock and prevent the subsequent suspend till
HSIC device is auto suspended.

CRs-Fixed: 403975
Change-Id: I93ccd874bf489190e4afb94b533db47bb2911db8
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

Conflicts:
	drivers/usb/core/driver.c
	drivers/usb/host/ehci-msm-hsic.c
USB: Prevent system suspend when HSIC device is active

Some buses like HSIC would like to keep device in suspend state
after system resume.  The remote wakeup or interface activity
later will auto resume the device.  This will work only if the
device is auto suspended before system suspend.  If the device
runtime state had been active during system suspend and system
suspend routine put the device in suspend, it will not be resumed
during system resume.  When remote wakeup happen for this device,
the runtime resume will not bring the device to active as runtime
core think it is already active.

The HSIC bus ensure that device is auto suspended prior to system
suspend by holding a wakelock till the bus is suspended.  HSIC bus
is not handling the case where device is auto resumed immediately
after system suspend begins.  HSIC bus simply put the device into
suspend in system suspend routine.

This patch fixes above issue by returning an error code if the device
is not auto suspended during system suspend.  Also add a safe guard
check in HSIC system resume routine to skip device resume only if it
is auto suspended prior to system suspend.

CRs-Fixed: 422876
Change-Id: I888585ed872d808aa4dbca33b529fcc32994349b
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

Conflicts:
	drivers/usb/core/driver.c
	drivers/usb/host/ehci-msm-hsic.c
EHCI: HSIC: Prevent disabling wakeup irq twice

If PM resume and Wakeup irq happen at same time
its possible to disable wakeup irq twice. Prevent
the same by protecting with spinlock

CRs-Fixed: 396895
Change-Id: I3320478d6c770787bc571964f4a38dce6927af63
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

Conflicts:
	drivers/usb/host/ehci-msm-hsic.c
msm: hsic: Disallow processor idle sleep while driving resume signal

HSIC controller should send SOF with in 3 msec after completing
the resume signal.  If processor is in idle sleep state, the timer
interrupt generated by HSIC controller to indicate resume completion
gets delayed.  If the interrupt handler is not run with in 3msec
after resume, the resume sequence is repeated.  Disallow processor
idle sleep to avoid multiple resume cycles.

CRs-Fixed: 397154
Change-Id: Ibc8965ad8bcd94e0b1b1d39b5b2ad8f39cf51095
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

mako: hsic: Disallow processor idle sleep while driving resume signal

Conflicts:

	arch/arm/mach-msm/lge/mako/board-mako.c

Conflicts:
	arch/arm/mach-msm/board-8064.c
	arch/arm/mach-msm/lge/mako/board-mako.c
	drivers/usb/host/ehci-msm-hsic.c
	include/linux/usb/msm_hsusb.h
USB: Allow skipping device resume during system resume

Some buses would like to keep their devices in suspend state during system
resume.  For example HSIC controller driver prevent system suspend when
HSIC device is active.  If this device is resumed, during system resume
HSIC controller acquire wake lock and prevent the subsequent suspend till
HSIC device is auto suspended.

(cherry picked from commit 6f199aa800253a69e5679d1057823039f1bd65c9)

Change-Id: Id9b15a20345423c6f33fd7d8cd2a55372a1e6b4b
CRs-Fixed: 403975
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

Conflicts:

	drivers/usb/core/driver.c
	drivers/usb/host/ehci-msm-hsic.c
EHCI: HSIC: Add enhancements to debug logging

This change addresses following enhancements to debug
logging:-

1) Add data payload logging which is not currently
supported. This helps to sniff first 32 bytes of data
being sent and received. Data payload logging is
enabled by default. To disable data payload logging:-

echo 0 > /sys/module/ehci_hcd/parameters/enable_payload_log

2) Current urb submission event logging does not cover
root hub submissions, hence move urb submission logging
to hcd driver.

3) Current urb submission event logging does not return
the correct status if submission fails. Hence log the
return status of urb submission.

CRs-Fixed: 393294
Change-Id: Ic7e555e1545ec7d7b0e4042cd35235e0af26fb01
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
usb: ehci-msm-hsic: Fix compilation error

The ehci-msm-hsic driver's bus suspend and resume functions
depend on ehci_hcd's bus_suspend/resume functions, which are
NULL when CONFIG_PM is not defined. Fix the compilation error
by also #defining these sub-driver functions NULL, as they
are effectively no-ops.

Change-Id: Ie250dfae3caccb737ce26bdda17c5b21d358eced
Signed-off-by: Jack Pham <jackp@codeaurora.org>
usb: Add support to set autosuspend delay by controller driver

USB core driver sets the autosuspend delay to 1 sec for root hub and
its children by default. In case if delay needs to be changed for a
particular controller, it requires class driver to explicitly call
PM API to set the new values. Hence add a call back handler to set
autosuspend delay in controller driver. This makes class driver code
generic.

Change-Id: I62121651f0a9648a2909ca7eb4081a6c2567ed01
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
usb: Decrease autosuspend delay to 200ms upon usb disconnect

Reduce overall HSIC wakelock active time by decreasing autosuspend
delay for HSIC mdm device from 1 sec to 200ms. However when diag is
active it would send poll events for every 500ms causing frequent
supsend/resume. Avoid this by increasing autosuspend delay to 1 sec
when diag is active. Also, set autosuspend delay for root hub to 0 by
default. These changes reduce time HSIC controller is active when the
bus is idle for better power savings.

CRs-Fixed: 404378
Change-Id: I0500f6b125dff158e6e0c10f3f2023b18ce9dd30
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
usb: ehci-msm-hsic: Remove usage of MSM_GPIO_TO_INT

MSM_GPIO_TO_INT is a platform-specific macro that should only
be used in board files, not drivers. In this case, we actually
don't need the GPIO number in the driver itself and only need
to manipulate it using the IRQ number it maps to, so perform the
mapping in the device file.

Change-Id: I99eb964f3c7c4e90a4d75d16b2b29c687c3437ca
Signed-off-by: Jack Pham <jackp@codeaurora.org>
EHCI: HSIC: Allow standalone power collapse when HSIC is active

HSIC generates interrupt at 4ms interval. If idle power collapse
is enabled when HSIC is active, krait keeps on going into idle
power collapse requesting RPM to handle the sleep set requirement.
If HSIC interrupt comes after 4ms interval, krait comes out of idle
power collapse and it again ask RPM to handle this request therefore
keeps RPM busy handling requests due to frequent idle power collapse.
This has a power impact. Hence only allow standalone power collapse
when HSIC is active to avoid RPM involvement in assisting kraits to
power collapse. Vote for idle power collapse when HSIC goes to low
power mode.

Change-Id: Iee8bc1fa180499f2d26fbac955a6a6ed767fdeb4
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/board-8064.c
	arch/arm/mach-msm/lge/mako/board-mako.c

Conflicts:
	arch/arm/mach-msm/board-8064.c
	arch/arm/mach-msm/lge/mako/board-mako.c
usb: ehci-msm-hsic: Add support in device tree to MSM HSIC host

Add support in device tree to MSM HSIC host including support in
GDSC (Global Distributed Switch Controller) for new platforms.

Change-Id: I6b0df0eabb03278b97b2b69f9fcdc2ef3806ba0b
Signed-off-by: Ofir Cohen <ofirc@codeaurora.org>
usb: ehci-msm-hsic: Change HSIC reset sequence

Due to USB HW changes, RST CMD resets CSC/CCS fields in PORTSC
and PCI bit in USBSTS. Therefore HSIC reset sequence should be
changed to avoid case that the device was powered up before the
host and due to a RST CMD the host will miss that the device is
connected.

CRs-Fixed: 417642
Change-Id: I2b1fb2a92658058d70ccc6cb5f73174ce4128b72
Signed-off-by: Ofir Cohen <ofirc@codeaurora.org>
USB: HSIC: Add support for HSIC core and SMSC HUB using DT

Add device tree support in SMSC HUB driver which also registers
platform_device for HSIC as its child. This allows SMSC HUB driver
to turn OFF clocks for power savings after HSIC is suspended.
Also add support for SMSC HUB to use dedicated clock as ref_clk
instead of XO.

Change-Id: I3e8828ddc232936df3e21c8e1158af92b16996a2
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
usb: ehci-msm-hsic: Add asynchronous reset to HSIC

Add support for asynchronous block reset to the HSIC hardware.
In platforms that uses an asynchronous reset methodology,
the HSIC alt_core_clk is not presented.

Change-Id: I0dc0e1bf294260a5530e01660d970cc939a9dbec
Signed-off-by: Ofir Cohen <ofirc@codeaurora.org>
usb: ks_bridge: Fix memory leaks in the driver

This change addresses two memory leaks:-
1) misc device is not getting deregistered during device
disconnect. Hence call misc_deregister() in disconnect.

2) Driver returns without freeing previous instances of
the driver data structure if memory allocation fails. Hence
free up memory allocated for ks_bridge structure.

Change-Id: I90133a002aa9d38597de8d1b21d3aad621552d46
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

Conflicts:
	drivers/usb/misc/ks_bridge.c
USB: HSIC: Fix setting of strobe and data gpios for HSIC host

Since the following commit I3e8828ddc232936df3e21c8e1158af92b16996a2
the ehci msm hsic host driver read device tree settings as the strobe
and the data gpios. In case that these gpios not exists in the device
tree the return value is negative. The return value was assigned to
unsigned variables, therefore the driver assumes that there are
such gpios.
This fix handles correctly the return value of the of_get_named_gpio.

Change-Id: Ia5dde57cc36438b977791df658375e0946123096
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>
msm: mdm: Assert soft_reset_gpio in mdm_power_down_common

In cases where the external modem is powered up very early in the
boot up process, user space application is not loaded as a result
mdm2ap_status is never pulled high. In case where we need to shutdown
the phone for charging we leave the ap2mdm_soft_reset_gpio pulled
high which results in leakage. Assert the ap2mdm_soft-reset_gpio
irrespective of the state of mdm2ap_status gpio.

CRs-Fixed: 425684
Change-Id: Icd37ac8eec1a8b9259563f2627ee57340f4e9f59
Signed-off-by: Taniya Das <tdas@codeaurora.org>
usb: host: ehci: allow ehci_bus_resume symbol to be unused

All the platforms may not use ehci_bus_resume symbol in their
hc_driver structure. This may result in below warning:

drivers/usb/host/ehci-hub.c: warning: 'ehci_bus_resume' \
    defined but not used

In order to remove this warning add '__maybe_unused' annotation
to ehci_bus_resume function.

Change-Id: I3c97eed7555688d99d68618f3810197e574499cb
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
usb: hsic: suspend hsic until really activated by the gadget driver

Hsic can enter to low power mode only after bus suspend when
connected to host. Since there is no disconnect state in hsic,
hsic remaines resumed even not activated by the gadget driver.
Therefore hsic still votes for some resources, such as clocks,
that prevent from power save modes to occur, as Vdd minimization.

This fix suspends the hsic by default, right after hsic udc driver
Initializations take place, and only on activation by the gadget
driver,aka pullup, resume the hsic device.

Change-Id: I22ecbbd66e76e28161428287e6a8b44cf42a1325
CRs-Fixed: 400263
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>