[RFC 0/4] mmc: sdhci-msm: Add CQE support for sdhci-msm

[Ritesh Harjani]

From: Ritesh Harjani <riteshh@xxxxxxxxxxxxxx>

Hi All,

This is RFC patch series based on top of ulfh_mmc/cmdq branch
which is based upon Adrian's CMDQ patch series.

Below patch series enables CQE for sdhci-msm platform.
This has been tested on internal 8996 MTP which has CMDQ support.

Fixes w.r.t. CMDQ:-
There are some patches identified which were required atleast on
MSM platform. I am not sure if these are required for any other
CQE platform or not. Patchset 1, 3 & 4 commit text describes
the problems.

Performance related:- 
I gave one small shot for performance and the numbers were not looking good.
So, unless I have tested for performance completely, I should not discuss 
on performance numbers as of now with this patchset. 
I can try doing some more performance testing and post the results -
though this may take some while.

I used below test script for random read/write test.

*randwrite-test-script*
[global]
bs=32k
size=1g
rw=randwrite
direct=1
directory=/data/fiotest

[file1]
filename=singlefile1

*randread-test-script*
[global]
bs=32k
size=1g
rw=randread
directory=/data/fiotest

[file1]
filename=singlefile1

@Adrian,
Thanks a lot for pursuing and bringing CMDQ patch series to it's final stages :)


Ritesh Harjani (4):
  mmc: cqhci: Move CQHCI_ENABLE before setting TDLBA/TDLBAU
  mmc: sdhci-msm: Add CQHCI support for sdhci-msm
  mmc: sdhci-msm: Change the desc_sz on cqe_enable/disable.
  mmc: sdhci-msm: Handle unexpected interrupt case on enabling legacy
    IRQs on CQE halt

 .../devicetree/bindings/mmc/sdhci-msm.txt          |   1 +
 drivers/mmc/host/Kconfig                           |   1 +
 drivers/mmc/host/cqhci.c                           |   7 +-
 drivers/mmc/host/sdhci-msm.c                       | 121 ++++++++++++++++++++-
 4 files changed, 125 insertions(+), 5 deletions(-)

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