[coreboot-gerrit] Patch merged into coreboot/master: google/gru: drive WLAN_MODULE_RST# low as early as possible

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit e06a1b895c9905c53faaacf9286bafea7a3ef921
Author: Brian Norris <briannorris at chromium.org>
Date:   Wed Sep 21 18:16:54 2016 -0700

    google/gru: drive WLAN_MODULE_RST# low as early as possible
    
    GPIO1_B3 (WLAN_MODULE_RST#) defaults as a pull-up input, but it is also
    "pulled up" by 1.8V_WLAN. However, 1.8V_WLAN remains low for some time
    during early boot. This leaves the signal floating somewhere in the
    middle.
    
    This has two potential issues:
    (1) we're leaking some power for some (hopefully) short period of time
    (2) we are possibly screwing with the Wifi power sequence; we aren't
        supposed to deassert PDn (i.e., MODULE_RST#) until all the rails
        have fully ramped for some period of time
    
    Neither of the above issues are likely to be significant, but it is nice
    to fix, I expect.
    
    BRANCH=gru
    BUG=chrome-os-partner:54026
    TEST=measure WLAN_MODULE_RST# on scope at boot time
    
    Change-Id: Ia6af9ad6954ad8feeda33015e3f205842380939e
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: 0e890a2787bf034d3358a33fc88c2dd8078593ab
    Original-Change-Id: I120e26ad0ca486a326874986e142dcaee965b62d
    Original-Signed-off-by: Brian Norris <briannorris at chromium.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/388009
    Original-Reviewed-by: Douglas Anderson <dianders at chromium.org>
    Original-Reviewed-by: Julius Werner <jwerner at chromium.org>
    Reviewed-on: https://review.coreboot.org/16882
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel <paulepanter at users.sourceforge.net>
    Reviewed-by: Martin Roth <martinroth at google.com>


See https://review.coreboot.org/16882 for details.

-gerrit