Subject: Re: [RFT PATCH 0/4] usb: dwc2: Fix core reset and force mode delay
 problems
To: John Youn <johnyoun@synopsys.com>, linux-usb@vger.kernel.org,
        Doug Anderson <dianders@chromium.org>
References: <cover.1459211397.git.johnyoun@synopsys.com>
Cc: Felipe Balbi <balbi@ti.com>, Michael Niewoehner <linux@mniewoehner.de>,
        Tao Huang <huangtao@rock-chips.com>,
        Julius Werner <jwerner@chromium.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, Caesar Wang <caesar.upstream@gmail.com>,
        Heiko Stuebner <heiko@sntech.de>, Felipe Balbi <balbi@kernel.org>,
        Remi Pommarel <repk@triplefau.lt>,
        Kever Yang <kever.yang@rock-chips.com>, Przemek Rudy <prudy1@o2.pl>
From: Stefan Wahren <stefan.wahren@i2se.com>
Message-ID: <56FCE567.1050004@i2se.com>
Date: Thu, 31 Mar 2016 10:52:55 +0200
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Hi John,

Am 29.03.2016 um 04:36 schrieb John Youn:
> 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

i applied the complete patch series on 4.6rc-1 and successfully tested
it with my Raspberry Pi B (IP 2.80a, dr_mode=HOST).

Probing and usual USB devices (network, keyboard) still works fine.

Do you need any other specific tests?

Regards
Stefan


>
> 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(-)
>