[U-Boot] [RFC 0/3][v4] mmc inizialization steps enhanced

[Raffaele Recalcati]

I have added some better inizializations and status check.
I have created following patchset for Davinci dm365 against
git://arago-project.org/git/projects/u-boot-davinci.git git tree.
There are two commits more in that tree, but they are not
in conflict with my work.
I have finally tested this series on basi board, based on 
Davinci dm365, that contains an eMMC device. 

Raffaele Recalcati (3):
  mmc: checking status after commands with R1b response
  mmc: SEND_OP_COND considers card capabilities (voltage)
  mmc: trace added

 drivers/mmc/mmc.c |  136 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 include/mmc.h     |    6 ++
 2 files changed, 137 insertions(+), 5 deletions(-)