libata,pata_via: revert ata_wait_idle() removal from ata_sff/via_tf_load()

Commit 978c0666 (libata: Remove excess delay in the tf_load path)
removed ata_wait_idle() from ata_sff_tf_load() and via_tf_load().
This caused obscure detection problems in sata_sil.

  https://bugzilla.kernel.org/show_bug.cgi?id=16606

The commit was pure performance optimization.  Revert it for now.

Reported-by: Dieter Plaetinck <[email protected]>
Reported-by: Jan Beulich <[email protected]>
Bisected-by: gianluca <[email protected]>
Cc: [email protected]
Signed-off-by: Jeff Garzik <[email protected]>
2 files changed