ASoc: msm: Increase max buffer size to 4k for lowlatency playback

- Small buffersize is resulting in scheduling issues.
- Increase max buffer size so that user space can
  configure large buffer size to avoid scheduling
  issues.

bug-id: 6865729
Signed-off-by: SathishKumar Mani <smani@codeaurora.org>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
Signed-off-by: poondog <markj338@gmail.com>
ASoC: msm: Reduce min buffer size for low latency

The current low latency driver has 512 bytes as
the min buffer size threshold. With this reducing
the playback time to lower values is not possible.
Setting it to 128 bytes gives us more room
to try out lower buffer sizes from the user space

Signed-off-by: Alexy Joseph <alexyj@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
Signed-off-by: poondog <markj338@gmail.com>
ASoC: msm: Change QOS value for low latency path

There were variations in the time taken to
return from each write. This was due
to the delay in switching in and out of
power collapse. To manage this set QOS
value to 1ms so that the core has enough
time to wake up from power collapse

Signed-off-by: Alexy Joseph <alexyj@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
Signed-off-by: poondog <markj338@gmail.com>
sched: set sched_mc_power_savings to 2, which is the highest power saving possible value for this tunable. Basically according to http://elinux.org/images/1/1d/Comparing_Power_Saving_Techniques_For_Multicore_ARM_Platforms.pdf this tunable provides serious power saving improvements close to the power savings of hotpluging cores. Since in this Kernel we're using always a minimum of 2 cpus online at any time during screen off we might actually benefit from this because this feature packs tasks together and try to bind them to cpu0, which in theory will let cpu1 idle longer, thus improving battery life.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: poondog <markj338@gmail.com>