lkml.org 
[lkml]   [2014]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRE: [PATCH] phy: phy-samsung-usb2: Change phy power on/power off sequence
    Date
    Hi Daniel,

    > From: Daniel Drake [mailto:drake@endlessm.com]
    > Sent: Tuesday, June 24, 2014 5:09 PM
    >
    > On Tue, Jun 24, 2014 at 1:54 PM, Kamil Debski <k.debski@samsung.com>
    > wrote:
    > > The Exynos4412 USB 2.0 PHY hardware differs from the description
    > > provided in the documentation. Some register bits have different
    > > function. This patch fixes the defines of register bits and changes
    > > the way how phys are powered on and off.
    >
    > I guess this replaces the patch titled "drivers: phy: exynos4x12-phy:
    > fix HSIC1 power on/off sequence"

    Yes, indeed it replaces this patch. I did some more research on how the
    hardware actually behaves.

    >
    > Tested on ODROID-U2. Seems to be working as well as the previous patch:

    Thank you very much for testing.

    > - Internal SMSC hub works on boot and after reboot, tested with USB
    > mouse
    > - Internal SMSC ethernet device works on boot, but disappears upon
    > reboot. (same as previous patch, also reproduced by Marek)

    By reboot I guess that you mean typing "reboot" or by using SysRq magic
    and not power cycling?

    If so, I had experienced the same symptoms. I guess that the Ethernet
    chip is not reset properly and fails to enumerate without power cycling
    (it's nRESET pin is connected to P3V3).

    I found that removing regulator-always-on from buck8_reg: BUCK8 in the
    dts file fixes this problem.

    Best wishes,
    --
    Kamil Debski
    Samsung R&D Institute Poland




    \
     
     \ /
      Last update: 2014-06-24 18:21    [W:2.331 / U:0.068 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site