sony_msm8x60: squashed set of commits from CAF

This is a squash of
2757c1c msm_fb: display: return fail if pipe still staged
3a33edd msm_fb: dsiplay: fix frame buffer f_count leak
dcaa224 msm_fb: display: Configure solidfill color to black
a74d332 msm_fb: display: fix iommu leak during base layer swap
cbfec58 msm_fb: display: keep borderfill pipe's iommu info
a51b02d msm_fb: display: add mfd null pointer and mfd panel_power_on checks
80baf63 msm_fb: Fix adb shell start/stop issue when bypass enabled
967d45a msm_fb: display: fix the hang issue caused by solidfill pipe
8566f3c msm_fb: display: Do a pre-fill to writeback buffers.
b7aefb1 msm_fb: Remove the extra freelist in display_commit
3ad1c656 msm_fb: display: add an extra write of 0 to clear dsi-ack-err bit

from codeaurora forums.

=======================================================================
msm_fb: display: add an extra write of 0 to clear dsi-ack-err bit

In addition to writing 1 to clear dsi-ack-err bit, an extra write of 0
is also need to clear error bit completely.

CRs-fixed: 478443
Change-Id: Id4c3e2a5a29534d65601999d3bbf9f30ebc73896
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>

msm_fb: Remove the extra freelist in display_commit

There is an extra freelist call to unmap IOMMU source buffers
in display_commit for LCDC interface. This is causing IOMMU
page faults during boot up on targets with LCDC interfaces.
Remove this extra freelist call.

Change-Id: I12a905efc82c5b9751acbc5941a66d0b58027509
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>

msm_fb: display: Do a pre-fill to writeback buffers.

When switching mdp operating mode to blt, writeback buffers need
pre-fill. Move the pre-fill code from isr routine to do_blt, where
actual switch to blt mode happens.

CRs-fixed: 471098
Change-Id: I0f845397894c749ac518a1fa605f84cd5fc2ad15
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>

msm_fb: display: fix the hang issue caused by solidfill pipe

When mdp pipe solidfill mode is disabled, the staled pipe info is used
to update mdp pipe regs. This caused mdp hang. Since
mdp4_overlay_rgb_setup function already resets solidfill mode, this
patch removes any pipe register updates that are related to disabling
solidfill mode.

CRs-fixed: 467555
Change-Id: I23f4b29731c9097ab0cc38baa00cd35bc536d2ba
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>

msm_fb: Fix adb shell start/stop issue when bypass enabled

Currently when 2/3/4 layer bypass is enabled, doing a adb shell
stop/start is failing overlay and composition happens through
GPU. Fix this issue by proper overlay configuration during this
scenario.

Change-Id: Ia04f1839bf80ed552671e48445af63a4dcd6bdfd
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>

msm_fb: display: add mfd null pointer and mfd panel_power_on checks

These checks are necessary for the situations where display is off but
vsync ctrl enable or disable is still called.

CRs-Fixed: 462586
Change-Id: I2ee43ff323da38359f3bff28669df19b87d8343d
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>

msm_fb: display: keep borderfill pipe's iommu info

Keep borderfill pipe's iommu info during base layer pipe
swap with original base layer pipe. Otherwise, borderfill
pipe's may contain original base layer pipe's iommu info
which cause iommu page fault due to same iommu buffer is
unmapped two times.

CRs-fixed: 436711
Change-Id: Ibdb792055287283c4449db07c2de2901aa4fe9b6
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>

msm_fb: display: fix iommu leak during base layer swap

Retain RGB1 iommu information during  base layer swap
so that iommu used by RGB1 can be freed back to pool later.

Change-Id: Ibed85179284743dc8a9d1434f0c81626b0567e16
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
(cherry picked from commit be46f9f596c5172438a74759d48ca7db600cd737)

msm_fb: display: Configure solidfill color to black

The solidfill color was getting reset to to default state to white.
Correctly reseting to black by default.

Crs-Fixed: 453600
Change-Id: I203ce61867d009509bf6acd01169f1fb0b223652
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>

msm_fb: dsiplay: fix frame buffer f_count leak

Frame buffer maintains a reference count (f_count) which increased
by fget() and decreased by fput(). overlay play will apply
fget() to frame buffer if it was the soruce buffer and fput()
will be applied to it after pipe commit done. However there has
extra fput() apply to frame buffer at the time pipe is freed.
This patch fix the problem by  clear MDP_MEMORY_ID_TYPE_FB from
pipe's flags to avoid extra fput() applying to frame buffer.

CRs-fixed: 411394
Change-Id: Ib2b72e6277480b5ace23cda554be485d9d477b3d
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>

msm_fb: display: return fail if pipe still staged

Pipe is not un-staged from mixer when it is unset.
It expects a pan_display() to un-stage it out of mixer.
Return fail at overlay_set() if pipe was still stage
at mixer.

CRs-fixed: 399193, 393979
Change-Id: I562f6e133bb239b30f4f53669dbf1cc5ddf80d02
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>