ata: ahci_tegra: disable/enable features from DT

The patch adds the following support
1. Added supoort to specify the link power management policy through DT
2. Added support for devslp + RTPM
3. Configure the devslp pin if devslp needs to be enabled.
4. Enable/disable SATA features from DT. By default all
   features will be enabled if a certain features needs to
   be disabled then we can specify those features through DT.
   From dt we can disable/enable HIPM, DIPM, Devslp, NCQ.
5. While dumping SATA registers enable T_SATA0_INDEX
   so that some debug info is also dumped.

This patch also fixes the following issues
1. When seq_file is NULL get hpriv from s->private.
2. During ahci_port_suspend check dynamically if we should
   wait for link to go to slumber/partial/devslp.

Bug 200123901
Bug 200129957

Signed-off-by: Preetham Chandru R <pchandru@nvidia.com>
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Change-Id: Ie1f7b5b205bf706b994b5eaeeb5234ccfab54d0c
Reviewed-on: http://git-master/r/1127296
(cherry picked from commit 2edd5bc4160bfd328ee29d4b4168893e6798edf6)

0 files changed, 0 insertions, 0 deletions