Stan's tests showed that PDMA improves sequential read performance by
a factor of 5 on a PowerBook 190. Last time I tried this on a
PowerBook 520 it didn't work, so let's not enable it there until
it can be tested with the present mac_scsi driver.
Tested-by: Stan Johnson <userm57@xxxxxxxxx>
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
---
arch/m68k/mac/config.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index 16cd5cea5207..95d548d8cc8a 100644
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -713,7 +713,7 @@ static struct mac_model mac_data_table[] = {
.name = "PowerBook 190",
.adb_type = MAC_ADB_PB2,
.via_type = MAC_VIA_QUADRA,
- .scsi_type = MAC_SCSI_LATE,
+ .scsi_type = MAC_SCSI_OLD,
.ide_type = MAC_IDE_BABOON,
.scc_type = MAC_SCC_QUADRA,
.nubus_type = MAC_NUBUS,
@@ -1077,9 +1077,7 @@ int __init mac_platform_init(void)
mac_scsi_old_rsrc, ARRAY_SIZE(mac_scsi_old_rsrc));
break;
case MAC_SCSI_LATE:
- /* PDMA logic in 68040 PowerBooks is somehow different to
- * '030 models. It's probably more like Quadras (see mac_esp).
- */
+ /* XXX PDMA support for PowerBook 500 series needs testing */
platform_device_register_simple("mac_scsi", 0,
mac_scsi_late_rsrc, ARRAY_SIZE(mac_scsi_late_rsrc));
break;
--
2.13.6
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