[PATCH v2 00/16] mmc: meson-gx: driver fixups and upgrades

[Jerome Brunet]

The patchset features several bugfixes, rework and upgrade for the
meson-gx MMC driver.

The main goal is to improve readability and enable new high speed
modes, such as eMMC DDR52 and sdcard UHS modes up to SDR50 (100Mhz)

SDR104 is not working with a few cards on the p200 and the
libretech-cc. I suspect that 200Mhz might be a bit too fast for the PCB
of these boards, adding noise to the signal and eventually breaking
the communication with some cards. The same cards are working well on a
laptop or the nanopi-k2 at 200Mhz.

This series has been tested on gxbb-p200, gxbb-nanopi-k2 and
gxl-s905x-libretech-cc

Changes since v1 [0]:
* Reorder patches to have fixes first, then rework and finally
  enhancements.
* Use CCF to manage clock phases

[0]: https://lkml.kernel.org/r/20170804174353.16486-1-jbrunet@xxxxxxxxxxxx

Jerome Brunet (16):
  mmc: meson-gx: fix mux mask definition
  mmc: meson-gx: remove CLK_DIVIDER_ALLOW_ZERO clock flag
  mmc: meson-gx: clean up some constants
  mmc: meson-gx: use _irqsave variant of spinlock
  mmc: meson-gx: cfg init overwrite values
  mmc: meson-gx: rework set_ios function
  mmc: meson-gx: rework clk_set function
  mmc: meson-gx: rework clock init function
  mmc: meson-gx: fix dual data rate mode frequencies
  mmc: meson-gx: work around clk-stop issue
  mmc: meson-gx: simplify interrupt handler
  mmc: meson-gx: implement card_busy callback
  mmc: meson-gx: use CCF to handle the clock phases
  mmc: meson-gx: implement voltage switch callback
  mmc: meson-gx: change default tx phase
  mmc: meson-gx: rework tuning function

 drivers/mmc/host/meson-gx-mmc.c | 718 +++++++++++++++++++++++++++-------------
 1 file changed, 497 insertions(+), 221 deletions(-)

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2.9.5