development kernel tree: Changes to 'andy'

git at git at
Tue Jul 15 10:12:51 CEST 2008

Rebased ref, commits from common ancestor:
commit 4b9a33e613c55fdd6a22ff246b22c45149a97dd6
Author: Jason Uhlenkott <jasonuhl at>
Date:   Tue Jul 15 09:12:34 2008 +0100

    sdio: use interruptible sleep in kthread main loops
    My FreeRunner's load average was leveling off at 2.00 as a result of
    these two kernel threads:
    SDIO Helper   D c02b4500     0   255      2
    [<c02b4298>] (schedule+0x0/0x2d4) from [<c02b4040>] (__down+0x100/0x158)
    [<c02b3f40>] (__down+0x0/0x158) from [<c02b3e2c>] (__down_failed+0xc/0x20)
     r7:00000000 r6:c01fbd64 r5:c7cb7134 r4:c7d58000
    [<c01fa6fc>] (CardDetectHelperFunction+0x0/0x1ac) from [<c01fbd80>] (HelperLaunch+0x1c/0x28)
     r5:c7cb7134 r4:c7cb7134
    [<c01fbd64>] (HelperLaunch+0x0/0x28) from [<c005bbd0>] (kthread+0x60/0x94)
    [<c005bb70>] (kthread+0x0/0x94) from [<c0048f7c>] (do_exit+0x0/0x744)
     r6:00000000 r5:00000000 r4:00000000
    SDIO Helper   D c02b4500     0   259      2
    [<c02b4298>] (schedule+0x0/0x2d4) from [<c02b4040>] (__down+0x100/0x158)
    [<c02b3f40>] (__down+0x0/0x158) from [<c02b3e2c>] (__down_failed+0xc/0x20)
     r7:c0382bb4 r6:c0382b34 r5:c7d5a000 r4:00000001
    [<c01f9104>] (SDIOIrqHelperFunction+0x0/0x29c) from [<c01fbd80>] (HelperLaunch+0x1c/0x28)
     r8:00000000 r7:00000000 r6:c01fbd64 r5:c0382bb4 r4:c0382bb4
    [<c01fbd64>] (HelperLaunch+0x0/0x28) from [<c005bbd0>] (kthread+0x60/0x94)
    [<c005bb70>] (kthread+0x0/0x94) from [<c0048f7c>] (do_exit+0x0/0x744)
     r6:00000000 r5:00000000 r4:00000000
    This fixes them to use interruptible sleep primitives while waiting in
    their main loops, as is conventional for kernel threads.  They can't
    actually be interrupted since kernel threads ignore all signals, but
    by sleeping this way they get classified as long term waiters, and
    don't get counted as running for purposes of load average calculation.
    This is intended as a minimal fix.  In the longer term, it'd probably
    make sense to replace the semaphores with completions or something,
    and to do away with some of these StudlyCapped wrapper functions.
    Signed-off-by: Jason Uhlenkott <jasonuhl at>
    This is untested, but what could possibly go wrong?  ;)

commit be7cbde703b99e9fbf5ee7e95f805ba29c67965f
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:12:34 2008 +0100

    Allows you to control RF_3V between 3.0V and 3.3V; this increases the
    phantom voltage at the internal antenna from 2.63V to 2.85V and may
    or may not affect antenna gain and GPS behaviour.
    You can read and set the GPS voltage by
    # cat /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-gps.0/power_mv
    # echo 3100 > /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-gps.0/power_mv
    Signed-off-by: Andy Green <andy at>

commit dd1abcc14ce89cc9ef74b60b5ac8e183028ac0b9
Author: Mike Westerhof <mwester at>
Date:   Tue Jul 15 09:12:33 2008 +0100

    commit 5f42e24d361cd83178fe8da9d68efbf41a011483
        Add missing initialization for the touchscreen driver for the
        gta01 platform.
        Signed-off-by: Mike Westerhof <mwester at>

commit 8786070b544806a0f29f4dc685f243ec5b13d2b4
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:12:33 2008 +0100

    Signed-off-by: Andy Green <andy at>

commit cc09be1a2b498a42cea30507a441eb67c80da1e4
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:12:33 2008 +0100

    Signed-off-by: Andy Green <andy at>

commit fd25f90517322fc6c07bfb8d34752d3cb41cb4b6
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:04:11 2008 +0100

    A few questions have been flying around about how optimal
    our waitstates are for various things including Glamo.
    This patch introduces new sysfs nodes
    If you cat them you get translated info about bus speed on
    that chip select, eg,
    # cat /sys/devices/platform/neo1973-memconfig.0/BANKCON1
    BANKCON1 = 0x00000A40
     Type = ROM / SRAM
     PMC  = normal (1 data)
     Tacp = 2 clocks
     Tcah = 0 clocks
     Tcoh = 1 clock
     Tacc = 3 clocks
     Tcos = 1 clock
     Tacs = 0 clocks
    You can write them in hex too
    # echo 0x200 > /sys/devices/platform/neo1973-memconfig.0/BANKCON1
    The write format for BANKCON0 - 5 looks like this
     b1..b0   PMC  Page Mode Config
     b3..b2   Tacp Page Mode Access Cycle
     b5..b4   Tcah Address hold after CS deasserted
     b7..b6   Tcoh CS hold after OE deasserted
     b10..b8  Tacc Access Cycle Period
     b12..b11 Tcos CS setup before OE asserted
     b14..b13 Tacs Address setup before CS asserted
    BANKCON 6 and 7 have two extra bits
     b16..b15  MT  Memory type (00=ROM/SRAM, 11=DRAM)
    If it's ROM/SRAM, the rest of the bits are as described above.
    For DRAM
     b1..b0   SCAN Column address number
     b3..b2   RAS to CAS delay
    The patch is intended to let people experiement on their own.  But
    of course you will crash things for sure if the timing is wrong, and
    you can also trash SD Card data if you make Glamo unstable, so remove
    it or remount ro first.  Other horrible things are possible, but
    because the settings aren't sticky, you should always be able to
    recover by either normal reboot usually or at worst NOR boot and then
    dfu.  Most likely you will just crash your session and have to reboot
    if your settings are bad, but consider yourself warned bad things are
    possible. :-)
    Signed-off-by: Andy Green <andy at>

commit db07519c1dfe916bcf9644bfdc4d7c03707a979e
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:04:05 2008 +0100

    We at least always enabled backlight on resume, this patch
    changes us to set backlight back to last requested backlight
    brightness level on resume.  Note it means that you can
    resume with screen blanked, but it should come back if that
    happened with touchscreen action as usual.
    seem to agree after resume when reportedly they didn't before.
    Signed-off-by: Andy Green <andy at>

commit e1673170182af199be7c6a2a346d8bad7e4dc532
Author: Andy Green <andy at>
Date:   Tue Jul 15 09:04:00 2008 +0100

    Two issues... we never took care to take down engines in suspend
    and bring them back in resume.  This was part of the display
    corruption that could be seen briefly on resume.  The other issue
    that made the "noise" corruption was bad ordering of resume steps.
    This patch simplifies (removing needless re-init) resume actions
    and makes explicit the suspend and resume steps.  It also adds
    code to track which engines are up and push them down in suspend
    and bring them back in resume.
    The result is no more corruption of display buffer in suspend, it
    comes back completely clean.
    Signed-off-by: Andy Green <andy at>

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