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KMSG_DUMP_PANIC
This series aims to develop logging facility for enterprise use.
It is important to save kernel messages reliably on enterprise system
because they are helpful for diagnosing system.
This series add kmsg_dump() to the paths loosing kernel messages. The use
case is the following.
[Use case of reboot/poweroff/halt/emergency_restart]
My company has often experienced the followings in our support service.
- Customer's system suddenly reboots.
- Customers ask us to investigate the reason of the reboot.
We recognize the fact itself because boot messages remain in
/var/log/messages. However, we can't investigate the reason why the
system rebooted, because the last messages don't remain. And off course
we can't explain the reason.
We can solve above problem with this patch as follows.
Case1: reboot with command
- We can see "Restarting system with command:" or ""Restarting system.".
Case2: halt with command
- We can see "System halted.".
Case3: poweroff with command
- We can see " Power down.".
Case4: emergency_restart with sysrq.
- We can see "Sysrq:" outputted in __handle_sysrq().
Case5: emergency_restart with softdog.
- We can see "Initiating system reboot" in watchdog_fire().
So, we can distinguish the reason of reboot, poweroff, halt and emergency_restart.
If customer executed reboot command, you may think the customer should
know the fact. However, they often claim they don't execute the command
when they rebooted system by mistake.
No message remains on the current Linux kernel, so we can't show the proof
to the customer. This patch improves this situation.
This patch:
Alters mtdoops and ramoops to perform their actions only for
KMSG_DUMP_PANIC, KMSG_DUMP_OOPS and KMSG_DUMP_KEXEC because they would
like to log crashes only.
Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Marco Stornelli <marco.stornelli@gmail.com>
Reviewed-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The reset command is part of the init sequence and it take effect
only if the lcd is powered.
The effect of the bug was that the sequence:
set lcd power_state to FB_BLANK_POWERDOWN
set lcd power_state to FB_BLANK_UNBLANK
Did not produced a complete reboot of the LCD which was showing fuzzy
colours.
This was not experienced before implementing correctly all the LCD power
states with the patch [1]. Since before the patch [1] the regulators were
not touched and the LCD shutdown was reached with a register write. After
the patch [1] a complete boot sequence with an initial reset is needed for
the display every time the LCD is powered up.
drivers-video-backlight-l4f00242t03c-full-implement-fb-power-states-for-this-lcd.patch
Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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enable/disable
Otherwise a double call to:
$ echo 4 > /sys/class/lcd/l4f00242t03/lcd_power
Will, the first power down the lcd and regulators correctly and the
second produce an unbalanced call to regulator disable.
Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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this lcd
Complete the support of fb power states managing correctly the regulators
bound to this driver.
Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Fixes sparse warning:
drivers/video/backlight/l4f00242t03.c:28:21: error: dubious one-bit signed bitfield
Signed-off-by: Mariusz Kozlowski <mk@lab.zgora.pl>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Extend the LED backlight tirgger driver with an option that allows for
inverting the trigger output polarity.
With the invertion option provided, I (ab)use the backlight trigger for
driving a LED that indicates LCD display blank condtition on my Amstrad
Delta videophone. Since the machine has no dedicated power LED, it was
not possible to distinguish if the display was blanked, or the machine was
turned off, without touching it.
The invert sysfs control is patterned after a similiar function of the GPIO
trigger driver.
[akpm@linux-foundation.org: make output match input, tighten input checking]
[akpm@linux-foundation.org: make output match input, tighten input checking]
Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Cc: Paul Mundt <lethal@linux-sh.org>
Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Currently the led device name is fetched from the device_type in
I2C_BOARD_INFO which comes from the platform data. This name is in turn
used to create an entry in sysfs.
If there exists two or more lp5521 on a particular platform, the
device_type in I2C_BOARD_INFO has to be the same, else lp5521 driver probe
wont be called and if used so, results in run time warning "cannot create
sysfs with same name" and hence a failure.
The name that is used to create sysfs entry is to be passed by the struct
led_platform_data. Hence adding an element of type const char * and
change in lp5521 driver to use this name in creating the led device if
present else use the name obtained by I2C_BOARD_INFO.
Signed-off-by: Arun Murthy <arun.murthy@stericsson.com>
Acked-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Driver contained possibility for circular locking.
One lock is held by sysfs-core and another one by the driver itself. This
happened when the driver created or removed sysfs entries dynamically.
There is no real need to do those operations. Now all the sysfs entries
are created at probe and removed at removal. Engine load sysfs entries
are now visible all the time. However, access to the entries fails if the
engine is disabled or running.
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Arun Murthy <arun.murthy@stericsson.com>
Reviewed-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Driver contained possibility for circular locking.
One lock is held by sysfs-core and another one by the driver itself. This
happened when the driver created or removed sysfs entries dynamically.
There is no real need to do those operations. Now all the sysfs entries
are created at probe and removed at removal. Engine load and mux
configuration sysfs entries are now visible all the time. However, access
to the entries fails if the engine is disabled or running.
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Arun Murthy <arun.murthy@stericsson.com>
Reviewed-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Currently all leds channels begins with string lp5523. Patch adds a
possibility to provide name via platform data. This makes it possible to
have several chips without overlapping sysfs names.
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Arun Murthy <arun.murthy@stericsson.com>
Cc: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- Remove unneeded input_free_device() after input_unregister_device().
- Add pca9532_destroy_devices() function for destroy devices.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The code doesn't check first sscanf() return value. If first sscanf()
failed then c contains some garbage. It might lead to reading
uninitialised stack data in the second sscanf() call.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (39 commits)
i915/gtt: fix ordering causing DMAR errors on object teardown.
i915/gtt: fix ordering issues with status setup and DMAR
drm/i915/execbuffer: Reorder binding of objects to favour restrictions
drm/i915: If we hit OOM when allocating GTT pages, clear the aperture
drm/i915/evict: Ensure we completely cleanup on failure
drm/i915/execbuffer: Correctly clear the current object list upon EFAULT
drm/i915/debugfs: Show all objects in the gtt
drm/i915: Record AGP memory type upon error
drm/i915: Periodically flush the active lists and requests
drm/i915/gtt: Unmap the PCI pages after unbinding them from the GTT
drm/i915: Record the error batchbuffer on each ring
drm/i915: Include TLB miss overhead for computing WM
drm/i915: Propagate error from flushing the ring
drm/i915: detect & report PCH display error interrupts
drm/i915: cleanup rc6 code
drm/i915: fix rc6 enabling around suspend/resume
drm/i915: re-enable rc6 support for Ironlake+
drm/i915: Make the ring IMR handling private
drm/i915/ringbuffer: Simplify the ring irq refcounting
drm/i915/debugfs: Show the per-ring IMR
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git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
* 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/xenbus: making backend support modular is too complex
xen/pci: Make xen-pcifront be dependent on XEN_XENBUS_FRONTEND
xen/xenbus: fixup checkpatch issues in xenbus_probe*
xen/netfront: select XEN_XENBUS_FRONTEND
xen/xenbus: clean up noise in xenbus_probe_frontend.c
xen/xenbus: clean up noise in xenbus_probe_backend.c
xen/xenbus: clean up noise in xenbus_probe.c
xen/xenbus: cleanup debug noise in xenbus_comms.c
xen/xenbus: clean up error handling
xen/xenbus: make frontend bus GPL
xen/xenbus: make sure backend bus is registered earlier
xenbus/frontend: register bus earlier
xen: remove xen/evtchn.h
xen: add backend driver support
xen: separate out frontend xenbus
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Previous to the last GTT rework we always rewrote the GTT then unmapped the
object, somehow this got reversed in the rework in 2.6.37-rc5 timeframe.
This fix needs to go to stable in an alternate form since the code changed.
This fixes DMAR reports on my Ironlake HP2540p.
Signed-off-by: Dave Airlie <airlied@redhat.com>
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This code was setting up the status page before setting the DMAR-is-on-bit,
so we were getting DMAR errors on the status page. Reverse the two bits
of init code to the correct result.
Signed-off-by: Dave Airlie <airlied@redhat.com>
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ssh://master.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel
* 'drm-intel-fixes' of ssh://master.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel: (37 commits)
drm/i915/execbuffer: Reorder binding of objects to favour restrictions
drm/i915: If we hit OOM when allocating GTT pages, clear the aperture
drm/i915/evict: Ensure we completely cleanup on failure
drm/i915/execbuffer: Correctly clear the current object list upon EFAULT
drm/i915/debugfs: Show all objects in the gtt
drm/i915: Record AGP memory type upon error
drm/i915: Periodically flush the active lists and requests
drm/i915/gtt: Unmap the PCI pages after unbinding them from the GTT
drm/i915: Record the error batchbuffer on each ring
drm/i915: Include TLB miss overhead for computing WM
drm/i915: Propagate error from flushing the ring
drm/i915: detect & report PCH display error interrupts
drm/i915: cleanup rc6 code
drm/i915: fix rc6 enabling around suspend/resume
drm/i915: re-enable rc6 support for Ironlake+
drm/i915: Make the ring IMR handling private
drm/i915/ringbuffer: Simplify the ring irq refcounting
drm/i915/debugfs: Show the per-ring IMR
drm/i915: Mask USER interrupts on gen6 (until required)
drm/i915: Handle ringbuffer stalls when flushing
...
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (67 commits)
cxgb4vf: recover from failure in cxgb4vf_open()
netfilter: ebtables: make broute table work again
netfilter: fix race in conntrack between dump_table and destroy
ah: reload pointers to skb data after calling skb_cow_data()
ah: update maximum truncated ICV length
xfrm: check trunc_len in XFRMA_ALG_AUTH_TRUNC
ehea: Increase the skb array usage
net/fec: remove config FEC2 as it's used nowhere
pcnet_cs: add new_id
tcp: disallow bind() to reuse addr/port
net/r8169: Update the function of parsing firmware
net: ppp: use {get,put}_unaligned_be{16,32}
CAIF: Fix IPv6 support in receive path for GPRS/3G
arp: allow to invalidate specific ARP entries
net_sched: factorize qdisc stats handling
mlx4: Call alloc_etherdev to allocate RX and TX queues
net: Add alloc_netdev_mqs function
caif: don't set connection request param size before copying data
cxgb4vf: fix mailbox data/control coherency domain race
qlcnic: change module parameter permissions
...
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git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (72 commits)
powerpc/pseries: Fix build of topology stuff without CONFIG_NUMA
powerpc/pseries: Fix VPHN build errors on non-SMP systems
powerpc/83xx: add mpc8308_p1m DMA controller device-tree node
powerpc/83xx: add DMA controller to mpc8308 device-tree node
powerpc/512x: try to free dma descriptors in case of allocation failure
powerpc/512x: add MPC8308 dma support
powerpc/512x: fix the hanged dma transfer issue
powerpc/512x: scatter/gather dma fix
powerpc/powermac: Make auto-loading of therm_pm72 possible
of/address: Use propper endianess in get_flags
powerpc/pci: Use printf extension %pR for struct resource
powerpc: Remove unnecessary casts of void ptr
powerpc: Disable VPHN polling during a suspend operation
powerpc/pseries: Poll VPA for topology changes and update NUMA maps
powerpc: iommu: Add device name to iommu error printks
powerpc: Record vma->phys_addr in ioremap()
powerpc: Update compat_arch_ptrace
powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3S
powerpc/time: printk time stamp init not correct
powerpc: Minor cleanups for machdep.h
...
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git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (42 commits)
IB/qib: Fix refcount leak in lkey/rkey validation
IB/qib: Improve SERDES tunning on QMH boards
IB/qib: Unnecessary delayed completions on RC connection
IB/qib: Issue pre-emptive NAKs on eager buffer overflow
IB/qib: RDMA lkey/rkey validation is inefficient for large MRs
IB/qib: Change QPN increment
IB/qib: Add fix missing from earlier patch
IB/qib: Change receive queue/QPN selection
IB/qib: Fix interrupt mitigation
IB/qib: Avoid duplicate writes to the rcv head register
IB/qib: Add a few new SERDES tunings
IB/qib: Reset packet list after freeing
IB/qib: New SERDES init routine and improvements to SI quality
IB/qib: Clear WAIT_SEND flags when setting QP to error state
IB/qib: Fix context allocation with multiple HCAs
IB/qib: Fix multi-Florida HCA host panic on reboot
IB/qib: Handle transitions from ACTIVE_DEFERRED to ACTIVE better
IB/qib: UD send with immediate receive completion has wrong size
IB/qib: Set port physical state even if other fields are invalid
IB/qib: Generate completion callback on errors
...
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If the Link Start fails in cxgb4vf_open(), we need to back out any state
that we've built up ...
Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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As the mappable portion of the aperture is always a small subset at the
start of the GTT, it is allocated preferentially by drm_mm. This is
useful in case we ever need to map an object later. However, if you have
a large object that can consume the entire mappable region of the
GTT this prevents the batchbuffer from fitting and so causing an error.
Instead allocate all those that require a mapping up front in order to
improve the likelihood of finding sufficient space to bind them.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Rather than evicting an object at random, which is unlikely to alleviate
the memory pressure sufficient to allow us to continue, zap the entire
aperture. That should give the system long enough to recover and reap
some pages from the evicted objects, forestalling the allocation error
for the new object.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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... and not leave the objects in a inconsistent state.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
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Before releasing the lock in order to copy the relocation list from user
pages, we need to drop all the object references as another thread may
usurp and execute another batchbuffer before we reacquire the lock.
However, the code was buggy and failed to clear the list...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
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Useful for determining the layout.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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In order to retire active buffers whilst no client is active, we need to
insert our own flush requests onto the ring.
This is useful for servers that queue up some rendering and then go to
sleep as it allows us to the complete processing of those requests,
potentially making that memory available again much earlier.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Currently the skb array is not fully allocated, and the allocation
is done as it's requested, which is not the expected way.
This patch just allocate the full skb array at driver initialization.
Also, this patch increases ehea version to 107.
Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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pcnet_cs:
add another ID of "corega Ether CF-TD" 10Base-T PCMCIA card.
Signed-off-by: Ken Kawasaki <ken_kawasaki@spring.nifty.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Dave Airlie spotted that his ILK laptop with DMAR enabled was generating
the occasional DMAR warning.
"The ordering in the previous code was to rewrite the GTT table before
unmapping the pages and that makes sense to me."
This is his stable patch ported to d-i-n.
Reported-by: Dave Airlie <airlied@redhat.com>
Original-patch-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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The docs recommend that if 8 display lines fit inside the FIFO buffer,
then the number of watermark entries should be increased to hide the
latency of filling the rest of the FIFO buffer.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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... in order to avoid a BUG() and potential unbounded waits.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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FDI and the transcoders can fail for various reasons, so detect those
conditions and report on them.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Cleanup several aspects of the rc6 code:
- misnamed intel_disable_clock_gating function (was only about rc6)
- remove commented call to intel_disable_clock_gating
- rc6 enabling code belongs in its own function (allows us to move the
actual clock gating enable call back into restore_state)
- allocate power & render contexts up front, only free on unload
(avoids ugly lazy init at rc6 enable time)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: checkpatch cleanup]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Enabling RC6 implies setting a graphics context. Make sure we do that
only after the ring has been enabled, otherwise our ring commands will
hang.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Re-enable rc6 support on Ironlake for power savings. Adds a debugfs
file to check current RC state, adds a missing workaround for Ironlake
MI_SET_CONTEXT instructions, and renames MCHBAR_RENDER_STANDBY to
RSTDBYCTL to match the docs.
Keep RC6 and the power context disabled on pre-ILK. It only seems to
hang and doesn't save any power.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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As the IMR for the USER interrupts are not modified elsewhere, we can
separate the spinlock used for these from that of hpd and pipestats.
Those two IMR are manipulated under an IRQ and so need heavier locking.
Reported-and-tested-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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... and move it under the spinlock to gain the appropriate memory
barriers.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32752
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Otherwise we may consume 20% of the CPU just handling IRQs whilst
rendering. Ouch.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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We need to ensure that writes through the GTT land before any
modification to the MMIO registers and so must impose a mandatory write
barrier when flushing the GTT domain. This was revealed by relaxing the
write ordering by experimentally mapping the registers and the GATT as
write-combining.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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As has_gem is unconditionally set to true, the conditional immediately
following that assignment is superfluous.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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These functions need to be reworked for Ironlake and above, but until
then at least avoid reading non-existent registers.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: combine with a gratuitous tidy]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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When bringing up new hardware, or otherwise experimenting, GPU hangs are
a way of life. However, the automatic GPU reset can do more harm than
good under these circumstances, as we may wish to capture a full trace for
debugging.
Based on a patch by Zhenyu Wang.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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On Ironlake, the LP0 latency is hardcoded and in ns unit, while on
Sandybridge, it comes from a register and with unit 0.1 us. So, fix
the wrong latency value while computing wm0 on Ironlake and Sandybridge.
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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This patch actually makes the watermark code even uglier (if that's
possible), but has the advantage of sharing code between SNB and ILK at
least. Longer term we should refactor the watermark stuff into its own
file and clean it up now that we know how it's supposed to work.
Supporting WM2 on my Vaio reduced power consumption by around 0.5W, so
this patch is definitely worthwhile (though it also needs lots of test
coverage).
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: pass the watermark structs arounds]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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