fs: ext4: sync with linux 3.4.81
msm: vidc: sync with caf
msm: vidc: Fix cache invalidation issue

- Cache invalidation is being skipped out on all output
  buffers except first buffer due to NULL buffer handle
  in case of all output buffers are allocated as single
  chunk.
- This change fixes the issue by properly assigning the
  buffer handle for all output buffers.

CRs-Fixed: 581806
Change-Id: I415c3cc0ef9d82ea3c97ea618babbfbfc9f36f8b
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
msm: vidc: Check input arguments correctly

This commit fixes some minor bugs in which input arguments or malloc
return values were being insufficiently validated.

Change-Id: Ib0b3d2ded29384b49ec61a5fc275d3aca1fd6e14
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
msm: vidc: Mask interrupts from venus after receiving IDLE message

IDLE message from venus indicates that the venus is idle and its
clocks are turned off. These clocks should not be turned on by any
pending or spurious(interrupts without any message) interrupts to save
power.

Change-Id: I622212a7e8c51106fbf69c491d129f219eb6ce54
CRs-fixed: 583989
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>
msm: vidc: Return failure for unsupported codecs

This change will check the codec type with supported codecs
(obtained from SYS_INIT_DONE response) and return failure
if unsupported codec is being set.

Change-Id: I113b4600b8c0152227cff50d5dff8c2da6f74c86
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
msm: vidc: fix corruption of registered buffer list

The buffer list for output buffers is accessed from
different threads leading to race conditions. Consider
the case of firmware throwing up a fatal error, which gets
propagated to v4l2 client. The v4l2 client closes the
driver fd, which will trigger msm_vidc_release_buffers
to release all output buffers and free node from
the registered buffer list. During this time, if
firmware sends a release reference event, the buffer
node being accessed in msm_vidc_release_buffers could
be freed, triggering kernel panic.

Change-Id: I522edff06a62dbc2ab60d6cca5990babb18d5c6c
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: Send ABORT in FLUSH command from the Client

When session error is sent to the client, client issues FLUSH
and release buffers commands. But as instance state is INVALID,
these commands are never sent to the firmware, instead FLUSH
DONE and Release buffer done are sent back to client even
though firmware might be working on these buffers which may
result into page faults.
This change fixes the issue by sending ABORT command to the
firmware at the time when driver receives FLUSH command. Then
firmware will release all buffers, clean up session and send
ABORT_DONE back to the driver.

Change-Id: Ie4c79a312d2336c68b858f5f5e2a85331cf55f7b
CRs-fixed: 592920
Signed-off-by: Deepak Verma <dverma@codeaurora.org>
msm: vidc: reduce clk frquency before disable

The change ensures that the clock frequency is reduced to min
before we disable it.
With just clk_disable, rpm still votes for high voltage on CX
as venus vote is not removed.
To unvote, the frequency is set to min.

CRs-Fixed: 574365
Change-Id: I8e0515b9816f8c451d545443573afaba611aafe7
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
msm: vidc: Fix unsupported codec error from video driver

- Client is getting unsupported codec error for set format
  sometimes after opening the video driver because driver
  was not updated with supported codecs information from
  video hardware.
- The same issue can be fixed by waiting for the driver state
  changed to CORE_INIT_DONE, which ensures the supported codecs
  information will be updated in video driver, before checking
  the supported codecs information.

CRs-fixed: 590158
Change-Id: Ia9132fdc01e4fa53533a3c9d14069d49501fa7d7
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
msm: vidc: Fix a race condition in masking interrupts

Fix a race condition when interaction with firmware happens
in following sequence:

1. Firmware writes IDLE message into the message queue.
2. Driver writes a new command into command queue.
3. Firmware reads this command and starts processing it.
4. Driver checks if command queue is empty and finds it empty.
5. Firmware writes the response (of the command sent in 2) in
   message queue. Firmware also writes another IDLE message and
   sets the idle register.
6. Driver check if the IDLE register is set and finds it set.
7. Driver masks the interrupts. Since interrupts are masked,
   driver misses the response written by firmware in 5.

This race condition is fixed by checking if message queue is
empty or not between 6 and 7.

Change-Id: I4e11210deeef855bb67337b8958aea73ae77d16b
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>
msm: vidc: avoid re-initialize of v4l2 spin lock

The fh_lock and fh_list variables are initialized
during probe in video_register_device. This was
re-initialized again when a new video instance was
opened. Since all video instances shared the same
fh_lock and fh_list variable, this gave rise to a race
condition in the v4l2 video driver. Consider the
case of multiple video instances being opened simultaneously.
One video instance has acquired the fh_lock and
calls a v4l2 function which calls v4l2_event_subscribe.
During this time another video instance is opened
and it re-intializes the fh_lock, so the first
instance no longer holds the spin lock and hits
ASSERT in v4l2_event_subscribed. This change
fixes the race condition.

Change-Id: I7af98c8f091cb94e6118c9e2ea1ba5d5d44c6833
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: defer probe if iommu_group_find fails

v4l2 video driver probe needs to defer till
iommu domains probe has been called. Without this
change, v4l2 video driver probe will fail if
iommu domains probe is not invoked prior to it.

Change-Id: Idbc1a4c90e558952f41f51ec96fdd3e7974490cd
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: enable deferred probe support for Q6

Add support to defer probe for Q6 driver. Also fixes
a bug in venus hfi, whereby probe for venus hfi fails
if the core_id is not zero.

Change-Id: I67269107132bf352186fad1e177e4099cf9f4534
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: change interface for opening driver instance

This change will ensure that vidc clients specify the
core id as venus or q6 to open a driver session.
Without this change, sometimes due to driver probe deferral,
core_id_0 would be taken by q6 and vidc clients intending to open a
venus decode session ended up opening a q6 decode session.

Change-Id: I4f9c862b8057999e4db7ca75be493138737a58a8
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: Disable clock gating for 8x26

There are stability issue observed on 8x26 with
inter-frame clock gating enabled so disable
interframe clock gating on 8x26.

Change-Id: I0e2b89a0ce36ed4d5f15903ffe68b7c7275719c9
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>
msm: vidc: fix memory leak issue in dynamic buffer mode

While flushing output buffers held in v4l2 video
driver, i.e, with ref count equal to 2, the driver
was freeing the binfo structure. This would leak
the mapped output buffer memory. By avoiding
freeing of the binfo structure, the driver waits
for the release reference event from the firmware
to free and unmap the output buffer. Also move
initialization of dequeued flag for buffers to be
held in driver, till the time we queue this buffer
to firmware. By not doing so, the video driver can
enter a race condition, whereby, a output buffer could
be unmapped and freed before v4l2 client has called
dequeue on the buffer.

Change-Id: Ic95f13b9f4426574012539a76c0b87bedb8e805a
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: add sleep of 100us before clock disable

ARM9 execute following sequence when venus is idle
1. Disable ARM9 watchdog
2. Set bit 30 of A_VENUS_CPU_CS_SCIACMDARG0 register
   to indicate venus is idle
3. Write HFI_MSG_SYS_IDLE to message queue
4. Raise interrupt to host
5. ARM9 execute wait for interrupt instruction to go
   into low power state. This will internally drain the
   ARM9 write buffer which can generate bus transaction.
6. ARM9 in idle

Host clock gate venus based on following sequence
1. Host receive HFI_MSG_SYS_IDLE from the msg queue
2. Host check both cmd / msg queue are empty by
   comparing the queue read/write pointers.
3. Host check bit 30 of A_VENUS_CPU_CS_SCIACMDARG0
   register to confirm it indicate idle
4. Host clock gate whole venus

As the host clock gate venus in step 4, ARM9 is still
in step 5&6. The sleep will ensure that step 5 and 6
are completed before host clock gates venus.

CRs-Fixed: 589417
CRs-Fixed: 595251
Change-Id: Idf1f788718adea2dacceca97afa4ba4fe4562ddd
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
msm: vidc: NULL terminate devicetree match table

Without NULL termination, of_dev_lookup() can run
off the end of the array and looking at invalid data.

Change-Id: Ib7d8b3afdc76d3f196d620d47eb77d4e0bc74d53
CRs-fixed: 582111
Signed-off-by: Sachin Shah <sachins@codeaurora.org>
msm: vidc: update max P frames num for encode

Remove the restriction on the max number of
P frame interval.

Change-Id: I637372d7b0d409602df251bad4a135b25514dc95
Signed-off-by: Arun Menon <avmenon@codeaurora.org>