linux-kernel - [RFT PATCH 0/4] usb: dwc2: Fix core reset and force mode delay problems

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Message-Id: <cover.1459211397.git.johnyoun@synopsys.com>
Date:	Mon, 28 Mar 2016 19:36:25 -0700
From:	John Youn <johnyoun@...opsys.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Przemek Rudy <prudy1@...pl>
Subject: [RFT PATCH 0/4] usb: dwc2: Fix core reset and force mode delay problems

Hi,

The following patch series addresses the core reset and force mode
delay problems we have been seeing on dwc2 for some platforms.

I think I have identified the source of the inconsistencies between
platforms and this series attempts to address them.

Basically everything stems from the IDDIG debounce filter delay, which
is a function of the PHY clock speed and can range from 5-50 ms if
enabled. This delay must be taken into account on core reset and force
modes. A full explanation is provided in the patch commit log and code
comments.

The first two patches are prerequisites to the force mode fixes,
including one patch that was sent separately by Przemek Rudy. I have
resubmitted it with this series for convenience.

Please help by reviewing and testing on your platforms.

Patches were tested on:
* Synopsys HAPS platform IP 3.20a OTG, dr_mode=OTG,HOST,PERIPHERAL

Regards,
John

John Youn (3):
  usb: dwc2: gadget: Only initialize device if in device mode
  usb: dwc2: Add delay to core soft reset
  usb: dwc2: Properly account for the force mode delays

Przemek Rudy (1):
  usb: dwc2: do not override forced dr_mode in gadget setup

 drivers/usb/dwc2/core.c     | 195 ++++++++++++++++++++++++++++----------------
 drivers/usb/dwc2/core.h     |   2 +-
 drivers/usb/dwc2/gadget.c   |  30 +++++--
 drivers/usb/dwc2/hcd.c      |   6 +-
 drivers/usb/dwc2/hw.h       |   1 +
 drivers/usb/dwc2/platform.c |   9 +-
 6 files changed, 161 insertions(+), 82 deletions(-)

-- 
2.7.4