Data Buffer Error as per spec section 4.15.1.1.2
results when there is Underrun or Overrun condition.

This error is considered non-fatal and never gets reported.
Its a very good indication on things going wrong at system level,
like running memory at much slower speed.

This is a good error to flag allowing system level corrections.

An issue was found with OMAP4460 board where DDR had to be run
at full speed and this logging helped.
Signed-off-by: NVikram Pandita <vikram.pandita@ti.com>
Reviewed-by: NMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: NVikram Pandita <vikram.pandita@ti.com>
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>