* Use pio == 255 == "auto-tune" in scc_config_drive_for_dma() instead of
forcing PIO4 on PIO fallback. Fix comment while at it.
* Rename scc_tuneproc() to scc_tune_pio() and add scc_tuneproc() wrapper.
Move finding of the best PIO mode and setting of transfer mode on the device
to the new wrapper.
* Fix scc_tune_chipset() to tune PIO modes. Do a small cleanup while at it.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
3fcece6691