[SCSI] mac_esp: fix PIO mode, take 2

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The mac_esp PIO algorithm no longer works in 2.6.31 and crashes my Centris
660av. So here's a better one.

Also, force async with esp_set_offset() rather than esp_slave_configure().

One of the SCSI drives I tested still doesn't like the PIO mode and fails
with "esp: esp0: Reconnect IRQ2 timeout" (the same drive works fine in
PDMA mode).

This failure happens when esp_reconnect_with_tag() tries to read in two
tag bytes but the chip only provides one (0x20). I don't know what causes
this. I decided not to waste any more time trying to fix it because the
best solution is to rip out the PIO mode altogether and use the DMA
engine.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

...

This commit is contained in:

Finn Thain 2009-12-05 12:30:42 +11:00 • committed by James Bottomley

parent f2818663c8

commit 02507a80b3

2 changed files with 53 additions and 56 deletions

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14

drivers/scsi/esp_scsi.c

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95

drivers/scsi/mac_esp.c

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