ide: don't set PIO mode on pre-EIDE drives
Fix handling of the PIO modes for the pre-EIDE drives that did not support the PIO Flow Control Transfer Mode value (00001 nnn) of the Set Transfer Mode feature by skipping the actual mode programming. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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