linux-phytec-ti

mmc: host: omap_hsmmc: add tuning support

MMC tuning procedure is required to support SD card
UHS1-SDR104 mode and EMMC HS200 mode.

The tuning function omap_execute_tuning() will only be
called by the MMC/SD core if the corresponding speed modes
are supported by the OMAP silicon which is set in the mmc
host "caps" field.

Add a separate function to set the UHSMS field to one of
SDR104, SDR50, DDR50, SDR25 or SDR12 depending on the
inserted SD card. This is required for tuning to succeed in
the case of SDR104/HS200 or SDR50.

Signed-off-by: Balaji T K <balajitk@ti.com>
[rk@ti.com: disable DEB interrupt during tuning]
Signed-off-by: Ravikumar Kattekola <rk@ti.com>
Signed-off-by: Viswanath Puttagunta <vishp@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
[kishon@ti.com : cleanup the tuning sequence]
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
[nsekhar@ti.com: add comment for tuning timeout]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>