msm_serial_hs:Enable Error/Break Char off

Follow the hardware sequence of enabling
RX_ERROR_CHAR_OFF and RX_BREAK_ZERO_CHAR_OFF in
MR2 register, for not allowing the Break and
parity/frame Error characters into Rx FIFO.

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Initialize tty_flush_recieve while Port Open

Initialize the tty_flush_recieve to default value during
Port Open to avoid a corner case where Tx bytes may get queued
twice by UART in the absence of initialization.

Corner Case:
UART client calls uart_flush_buffer() API to flush the
data on Tx while UART Tx is in middle of operation.
If client immediately calls UART Port close followed by UART Tx
after Port-Open, it may result in queueing same bytes twice

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Disable RX PIPE before sps_disconnect

We need to disable RX PIPE interrupt to avoid any
race condition between sps_disconnect and bam_isr

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Dynamic allocation of port structures

This patch allocates the msm_hs_port structures
dynamically during probe and cleans up during exit.
The msm_hs_get_uart_port function now looks up the
uart_state data structure to find the right uart_port.

Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Implement driver functionality to be closer to HW spec

Implement TX callflow to be in accordance with HW spec and make
sure TXEMT clock off logic is correct. On receiver side, issue
force stale interrupt and make sure upper layer get bytes upto
size of RX buffer

Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Defensive checks

Add defensive checks in the APIs exposed to clients
and tty layer to avoid unclocked access

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Cleanup

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Manage clock path-vote correctly

clock path vote is needed for core and iface vote,
so remove it after these votes are removed, and
make sure clock path vote/unvote are balanced by
removing unnecessary clock path vote

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Avoid RX getting stuck during rapid clock on/off

Due to race conditions in clock off and clock on sequence
BAM RX descriptor doesn't get queued or may get queued multiple
times. These issues may showup when the client issues rapid clock-on
clock-off operations.
This patch optimizes clock-off sequence while synchronizing clock
off/on with the BAM RX callback (In BAM RX callback, Forcestale
is not issued for every BAM RX callback).

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Race Condition during Baud Rate Configuration

Race Condition:
==============
CPU 0:
1.) Rx BAM pipe got disconnected during Baud Rate Cnfg
2.) Rx tasklet got scheduled
3.) Tasklet is issuing Rx command to BAM
4.) BAM API aquired spinlock and accessed Null Pointer
This lead to Null Pointer Access and Crash
CPU 1:
5.) As part of baud rate configuration process CPU 1
called BAM Rx Connect API
6.) BAM API is trying acquire Spinlock
7.) Spinlock is not released by CPU0
This lead to BUG ON

Fix:
===
During Baud Rate Configuration, if Rx command is queued
set the flag for not issuing any Rx command to BAM
Adding rx_cmd_exec variable to avoid command getting
queued twice without callback for the first

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Program RFR to synchronize clock-off sequence with HW

Assert the RFR line during clock off and de-assert
it after the clock off is successful. This is to avoid
the data to be coming from the client during clock off.

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Programing the TX FIFO watermark level to 4

As per the Hardware Data Book recommendation the
TX FIFO watermark level should not be zero.
Hence programing the TX FIFO watermark level to
4 to avoid corner cases

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Remove code dependency on flag tty_flush_receive

Removing code dependency on the flag and check the
circular buffer directly and make sure that spin lock is taken
appropriately in the tx lower half.

This avoids the condition that can cause
1. tx lower half
2. submit tx command
to race.

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>
Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm_serial_hs: Programming BCR Register

UART Core is showing inconsistent behaviour in firing
Stale Timeout Interrupt. Stale Timeout is not happening
at some points. After programming the BCR register the
Stale Timeout is happening as expected.
Also fix the BCR register offset to avoid instablilities when
console is disabled.

Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>
Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Revert "msm_serial_hs: Dynamic allocation of port structures"

This reverts commit b4808bfaf0050b61821ca79fd7208e53bac34ab2.

Can use that change. LG BLUESLEEP function need that, tried to fix,
But kernel fail to boot, not really need that change. so REVERT.

Now Kernel boot. and BT is OK.
msm: sdcc: Move vdd to optional property

Some devices might not use the vdd. So move vdd to optional property and
avoid controling the vdd in that device if qcom,not-use-vdd exists.

Change-Id: Ic504e7c2f6311cf158fc77fdc28b2723679826af
Signed-off-by: Devin Kim <dojip.kim@lge.com>
msm: vidc: update format during downscaling

When downscaling is enabled, update the port format
parameters based on port type.
Avoid updating the instance property during reconfig event
with sufficient resource. IL Client expects downscaled
parameters rather than reconfig parameters.

Signed-off-by: Pushkaraj Patil <ppatil@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: vidc: remove non fatal error messages

V4L2 core fails reqbufs ioctl if file IO is in
progress. This message is non fatal, so avoid
logging it as a error message in the video driver.

Signed-off-by: Arun Menon <avmenon@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: vidc: queue output-1 buffers to FW

While seeking, FW returns all the buffers to host.
In multi-stream usecase like downscaling, the o/p
buffers need to be re-queued back to FW.

Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
ARM: dts: msm: add SDHC DAT1 line wakeup support for 8974

This patch adds mpm and gpio based wakeup interrupt support.
SDIO card interrupt can wake up the system by pulling the
DAT1 line low. When the system is suspended mpm monitors
this line and wakes up the system.

Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>