V4L/DVB: tm6000: add tuner callback for dvb frontend

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: add special usb request to quit i2c tuner transfer

After sending an i2c command, tm6010 needs a reset, in order to properly
work.

While here, add the missing I2C_CLASS_TV_DIGITAL i2c class.

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: typo fix: the identifer string is wrong

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: fix: avoid unregister the driver after success

After successfully running tm6000_init_dev, due to a lack of a return(),
the driver runs the error code, unregistering the device.

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: add Terratec Cinergy Hybrid XE

[mchehab@redhat.com: moved the defines for the two beholder boards to a separate commit ]

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L-DVB: tm6000: add missing BEHOLDER board definitions

The missing of those board definitions break compilation

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: add digital init for tm6010

The init sequence requires extra initialization for tm6010 in digital
mode.

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: tm6000: fix driver compilation

The name of xc5000.h include file were wrong

Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB: xc3028: fix regression in firmware loading time

Fix a regression in the firmware loading time where it went from 1080 ms to
4700 ms.  This was noticed when the em28xx based HVR-950 took noticably longer
to load the driver.

Regression introduced in hg 12824.  The developer added an msleep() call with
an argument based on a newly introduced xc3028_ctrl field, which is left
initialized to zero for pretty much every board that is currently supported.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (13556a): v4l: Remove unneeded video_device::minor assignments

Now that the video_device registration is tested using
video_is_registered(), drivers don't need to initialize the
video_device::minor field to -1 anymore.

Remove those unneeded assignments.

[mchehab.redhat.com: apply just the tm6000 changes on a separate patch]

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (13555a): v4l: Use video_device_node_name() instead of the minor number

Instead of using the minor number in kernel log messages, use the device
node name as returned by the video_device_node_name() function. This
makes debug, informational and error messages easier to understand for
end users.

[mchehab.redhat.com: apply just the tm6000 changes on a separate patch]

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (13403): Add new TV cards of Beholder

Add new TV cards of Beholder for autodetect.

With my best regards, Dmitry.

Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov <d.belimov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

tm6000: Remove legacy code to work with older kernel versions

Such code has no space upstream and prevents tm6000 from compiling.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12854): tm6000: i2c addresses should now be specified in 7bit formats

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12853): tm6000: Fix almost all warnings at the driver

Onr warning is left, since it is there for a purpose:
tm6000-core.c:218: warning: ISO C90 forbids mixed declarations and code

It indicates a place where a temporary hack were added. Tests are needed to be sure that
we can remove it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12852): tm6000: Fix compilation against 2.6.31

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12848): tm6000: Add README with todo list

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12846): tuner-xc2028: Fix skip code for devices with broken read (tm6000)

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12845): tm6000: more buffer handling fixes

Before this patch, we were writing outside vmalloced buffer

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12844): tm6000: avoid writing on a floating pointer

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12843): tm6000: cleanup: remove a test debug code

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12842): tm6000: avoid kernel panic while retrieving the filling buffer

Instead of storing next buf on a temp var, saved over URB
processing, restore it using get_next_buf.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12841): tm6000: Fix compilation with newer v4l2-dev API

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12840): tm6000: add support for HVR900H

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12839): tm6000: Another trial to fix analog streaming

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12838): tm6000: Fix color support on tm6010

TM6010 uses some different registers for format support.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12837): tm6000: make tree buildable

Signed-off-by: Maykel Moya <moya@infomed.sld.cu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12836): tm6000: revert to an old way to copy video

The new way is causing machine hangups. This one works.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12835): tm6000: Cleanups to work like em28xx-video

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12834): tm6000: Fix two warnings

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12833): tm6000: add a proper init code for -alsa

Uses about the same initialization code as defined on usbaudio.c.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12832): tm6000: allow compilation of tm6000-alsa module

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12831): tm6000: Convert cx88-alsa into tm6000-alsa

- Remove cx88 specific setups;
- Add tm6000 specific start/stop commands;
- Do CodingStyle cleanups.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12830): tm6000: copy cx88-alsa as tm6000-alsa

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12829): tm6000: several changes on usb preparation trying to avoid -EPROTO errors

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12828): tm6000: fixes several CodingStyle and do some cleanups

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12827): tm6000: fix image hangs

A previous committed patch hanged image output. This patch corrects this issue.
It also warrants that buffer is updated for each frame0+frame1 frame set.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12826): tm6000: adds 10ms delay between two consecutive i2c write ops

tm6000 original driver seems to use a delay between two consecutive i2c write
operations.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12825): tm6000: I2C reading operations is not reliable on tm6000

tm6000 sometimes can't read from i2c, but this is currently required for
tuner-xc2028 to work.

This patch adds an option to tuner-xc2028 to not rely on i2c reading.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12824): tuner-xc2028: adds an option to send i2c data on slower speed

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12823): tm6000: Uses another method for handling incomplete packets

This requires a little more memory, and some memcpy to work, but the logic is
simpler than the previous method.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12822): tm6000: Add support for tm6010

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12821): tm6000: update USB request names and clean up i2c routine

Update the descriptions of the USB request types so that they match what
we now know they do.

Rework the i2c_xfer function so that it is more explicit what sort of I2C
transfers it is that the tm6000 can't perform.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12820): tm6000: fix i2c readings

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12819): tm6000: mts parameter has changed on tuner-xc2028.c

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12818): tm6000: Use dvb_frontend_detach instead of single symbol_put commands

Thanks to Mike Krufky for pointed that one out. Also include some minor
cleanups.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12817): tm6000: add a missing symbol_put

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12816): tm6000: fix tm6000 attach method and fix a few CodingStyles

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12815): tm6000: follow videobuf API changes

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12814): tm6000: fix eeprom reading on tm6000

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12813): tm6000: all read messages should use prev_reg

read messages with length>1 where using the wrong register.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12812): tm6000: fix build dependencies for tm6000 and tuner-xc2028

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12811): tm6000: a few registers is needed from the sif/noif setings

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12810): tm6000: Avoid sending xc3028 setups for other tuners

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12809): tm6000: Remove an old hack

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12808): tm6000: Move analog tv standards to tm6000-stds

tm5600/6000/6010 requires a large config table for video standards. Better to
move this to their own file.

Also added register settings for tm6010 (needs testing.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12807): tm6000: Properly select xc2028 parameters

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12806): tm6000: Select VIDEO_TUNER for tm6000 devices

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12805): tm6000: Fix a memory leak at tm6000-video

if a transfer buffer allocation fails, the last allocated urb is leaked
(it hasn't been stored in dev->urb[] yet so tm6000_uninit_isoc misses
it). The patch also includes a small typo fix.

Thanks to Florin Malita <fmalita@gmail.com> for pointing this.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12804): tm6000: Build the module properly if CONFIG_VIDEO_TM6000_DVB is selected.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12803): tm6000: make tm6000_devused static

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12802): tm6000: adds command to enable audio output at tm6000

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12801): tm6000: Add support for ADSTech Mini Dual TV (PTV-339).

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12800): tm6000: fix tm6000 analog video buffer handling

Previously, there were no sync between video buffer filling and received
URBs. So, the presented image were a mix of frame and frame-1. Now, a
filled buffer should contain only data for that frame.

allocates a maximum of 64 KB per each URB area. This fixed two bugs:

- Sometimes, there were no available continuos block of about 1 MB;
- Image weren't not properly updated, since parts of the URBs aren't
  updated.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12799): tm6000: avoid troubles if a header is broken on separate URBs

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12798): tm6000: Split header processing from header find

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12797): tm6000: Allow selecting audio bitrate

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12796): tm6000: Add a hack for PAL standards

The common code is not properly working. This hack should do the work
for now.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12795): tm6000: Fix buffering size

At the first time an application were called, resolutions were wrong.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12794): tm6000: handle also PAL/SECAM resolutions

Fix the resolutions for 625 line video standards (european PAL/SECAM)

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12793): tm6000: On some kernels, eeprom reading were generating a bug

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12791): tm6000: fix poll() method

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12790): tm6000: check for errors on usb->status

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12789): tm6000: fix DVB dependency

Compilation were causing errors, if DVB_CORE weren't selected.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12788): tm6000: Add initial DVB-T support

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12786): tm6000: Remove code dealing with the ZL10353

Remove code dealing with the ZL10353 as this is all handled by the ZL10353
module.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12785): tm6000: allow user gpio address for tuner reset

Modify tuner_callback to user the device's GPIO address field
for tuner reset.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12784): tm6000: Some cleanups at the driver

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12783): tm6000: add xc2028/3028 to dvb

Add experimental DVB frontend tuner interface to xc2028/3028

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12782): tm6000: Correct some device capabilities

Add tuner reset GPIO and demodulator address fields to the tm6000_core
struct.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12781): tm6000: Start adding support for GPIO device-specific parameters

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12780): tm6000: Improve handling of SMBus Write Byte commands followed by a read command.

SMBus Write Byte commands followed by a read command on the same I2C
address are not sent out to the chip as they wouldn't have any effect.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12779): tm6000: Correct dev init & Add general USB ctrl msg pause

Add GPIO4 reset, which is required to make DVB-T work with the Freecom
stick.
Add a general 5 ms pause to the "tm6000_read_write_usb" method.

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12778): tm6000: Fix SMBus Read Byte command

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12777): tm6000: Add support for Freecom Hybrid Stick / Moka DVB-T Receiver Dual

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12776): tm6000: decrement users count

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12775): tm6000: fix usb_submit_urb to be called inside interrupt context

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12774): tm6000: fix module load/unload

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12773): tm6000: fix module unregister

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12772): tm6000: fix module load/unload

Signed-off-by: Michel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

V4L/DVB (12770): Add tm6000 driver to staging tree

Adds a driver for Trident TV Master tm5600/tm6000 chips.

Those USB devices are usually found with a Xceive xc2028/xc3028
tuner, although the firmware seems to be modified to work with
those chips on some older devices.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Linus 2.6.34

Merge git://git./linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  rtnetlink: make SR-IOV VF interface symmetric
  sctp: delete active ICMP proto unreachable timer when free transport
  tcp: fix MD5 (RFC2385) support

Merge branch 'upstream' of git://ftp.linux-mips.org/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  MIPS: Oprofile: Fix Loongson irq handler
  MIPS: N32: Use compat version for sys_ppoll.
  MIPS FPU emulator: allow Cause bits of FCSR to be writeable by ctc1

rtnetlink: make SR-IOV VF interface symmetric

Now we have a set of nested attributes:

  IFLA_VFINFO_LIST (NESTED)
    IFLA_VF_INFO (NESTED)
      IFLA_VF_MAC
      IFLA_VF_VLAN
      IFLA_VF_TX_RATE

This allows a single set to operate on multiple attributes if desired.
Among other things, it means a dump can be replayed to set state.

The current interface has yet to be released, so this seems like
something to consider for 2.6.34.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

sctp: delete active ICMP proto unreachable timer when free transport

transport may be free before ICMP proto unreachable timer expire, so
we should delete active ICMP proto unreachable timer when transport
is going away.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tcp: fix MD5 (RFC2385) support

TCP MD5 support uses percpu data for temporary storage. It currently
disables preemption so that same storage cannot be reclaimed by another
thread on same cpu.

We also have to make sure a softirq handler wont try to use also same
context. Various bug reports demonstrated corruptions.

Fix is to disable preemption and BH.

Reported-by: Bhaskar Dutta <bhaskie@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MIPS: Oprofile: Fix Loongson irq handler

    The interrupt enable bit for the performance counters is in the Control
    Register $24, not in the counter register.
    loongson2_perfcount_handler(), we need to use

Reported-by: Xu Hengyang <hengyang@mail.ustc.edu.cn>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/1198/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

MIPS: N32: Use compat version for sys_ppoll.

    The sys_ppoll() takes struct 'struct timespec'. This is different for the
    N32 and N64 ABIs. Use the compat version to do the proper conversions.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
    To: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/1210/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

MIPS FPU emulator: allow Cause bits of FCSR to be writeable by ctc1

    In the FPU emulator code of the MIPS, the Cause bits of the FCSR register
    are not currently writeable by the ctc1 instruction.  In odd corner cases,
    this can cause problems.  For example, a case existed where a divide-by-zero
    exception was generated by the FPU, and the signal handler attempted to
    restore the FPU registers to their state before the exception occurred.  In
    this particular setup, writing the old value to the FCSR register would
    cause another divide-by-zero exception to occur immediately.  The solution
    is to change the ctc1 instruction emulator code to allow the Cause bits of
    the FCSR register to be writeable.  This is the behaviour of the hardware
    that the code is emulating.

    This problem was found by Shane McDonald, but the credit for the fix goes
    to Kevin Kissell.  In Kevin's words:

    I submit that the bug is indeed in that ctc_op:  case of the emulator.  The
    Cause bits (17:12) are supposed to be writable by that instruction, but the
    CTC1 emulation won't let them be updated by the instruction.  I think that
    actually if you just completely removed lines 387-388 [...] things would
    work a good deal better.  At least, it would be a more accurate emulation of
    the architecturally defined FPU.  If I wanted to be really, really pedantic
    (which I sometimes do), I'd also protect the reserved bits that aren't
    necessarily writable.

Signed-off-by: Shane McDonald <mcdonald.shane@gmail.com>
    To: anemo@mba.ocn.ne.jp
    To: kevink@paralogos.com
    To: sshtylyov@mvista.com
    Patchwork: http://patchwork.linux-mips.org/patch/1205/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---