linux-kernel - [PATCH v2 00/15] usb: dwc2: Fix Hibernation issues.

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Date:   Fri, 16 Apr 2021 16:46:40 +0400
From:   Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
To:     John Youn <John.Youn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Vardan Mikayelyan <Vardan.Mikayelyan@...opsys.com>,
        Grigor Tovmasyan <Grigor.Tovmasyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>
Subject: [PATCH v2 00/15] usb: dwc2: Fix Hibernation issues.

This patch set fixes and improves hibernation mode for dwc2 core.
It adds support for the following cases
    1. Hibernation entering/exiting flow by system suspend/resume.
    2. Exiting hibernation mode before removing driver and urb enqueue.
    3. Exiting hibernation from gpwrdn rst detect.

It updates the implementation of dwc2 entering and exiting
hibernation mode when a port is suspended or resumed or reset asserted.

It fixes hibernation issues between host and device mode when core
enters to hibernation in host mode and mode change happens. Also, a fix
is introduced for remote wakeup flow.

The patch set also improves implementation of entering to hibernation
from dwc2_handle_usb_suspend_intr() handler.

Changes since V1:
Updated bellow patches. Moved duplicated error checking *if* conditions
from innermost to outside if.
1. usb: dwc2: Add exit hibernation mode before removing drive
2. usb: dwc2: Allow exit hibernation in urb enqueue

Fixed an uninitialized pointer variable which was reported by
kernel test robot in "usb: dwc2: Add exit hibernation mode before
removing drive" patch. After fixing added Reported-by tags for
kernel test robot and Dan Carpenter.

Also removed some text from cover letter because I think that is
why vger.kernel.org was rejecting it.

Artur Petrosyan (15):
  usb: dwc2: Update exit hibernation when port reset is asserted
  usb: dwc2: Reset DEVADDR after exiting gadget hibernation.
  usb: dwc2: Fix host mode hibernation exit with remote wakeup flow.
  usb: dwc2: Fix hibernation between host and device modes.
  usb: dwc2: Allow exiting hibernation from gpwrdn rst detect
  usb: dwc2: Clear fifo_map when resetting core.
  usb: dwc2: Clear GINTSTS_RESTOREDONE bit after restore is generated.
  usb: dwc2: Move enter hibernation to dwc2_port_suspend() function
  usb: dwc2: Move exit hibernation to dwc2_port_resume() function
  usb: dwc2: Allow exit hibernation in urb enqueue
  usb: dwc2: Add hibernation entering flow by system suspend
  usb: dwc2: Add hibernation exiting flow by system resume
  usb: dwc2: Add exit hibernation mode before removing drive
  usb: dwc2: Update dwc2_handle_usb_suspend_intr function.
  usb: dwc2: Get rid of useless error checks in suspend interrupt

 drivers/usb/dwc2/core.c      |  25 ++++-
 drivers/usb/dwc2/core.h      |   3 +
 drivers/usb/dwc2/core_intr.c | 205 +++++++++++++++++++----------------
 drivers/usb/dwc2/gadget.c    |   4 +
 drivers/usb/dwc2/hcd.c       |  92 +++++++++++++---
 drivers/usb/dwc2/platform.c  |  15 +++
 6 files changed, 233 insertions(+), 111 deletions(-)

base-commit: 4b853c236c7b5161a2e444bd8b3c76fe5aa5ddcb
-- 
2.25.1