msm_fb: display: fix the underrun issue when playing interlaced videos

Interlaced videos require higher mdp clk rate and the current code
sets mdp clk to max and return. However mdp clk calculation may still
give a result higher than max mdp clk, for this case the result is
kept and used later to enable blt mode to avoid underrun.

Change-Id: I185d0d15e5b79e94561e790e41713cdb405f8bf4
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
msm_fb: Keep LCDC timing generator enabled during boot up

Keep the LCDC timing generator enabled during boot up on
MDP 3.03 targets if continuous splash screen feature is enabled.

Change-Id: I64276550f28e1f316c420f9cb158f7b8e938b8ea
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
msm_fb: Fix error in y-offset check logic in FB driver

After 4 KB alignment changes, the frame from 3rd buffer doesn't
get updated since during PUT_VSCREEN_INFO ioctl, the driver
returns -1 to userspace due to error in logic because the hole
size is not considered in calculating the logic for validity of
the y-offset. Change fixes this error.

Change-Id: Ib151970eacab4df36fb8274be0079bc814e93efe
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
msm_fb: Clean up the fix for error in y-offset check in FB driver

There is a failure observed in yres_virtual offset check and every
third frame gets skipped without an error message. Due to this high
fps is noticed in the test applications. Correct the yres_virtual
offset check.

Change-Id: Iddce0b75e0a9c466adad6eb5726203ae0586c27b
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>