m68k/mac: Enable PDMA support for PowerBook 190

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@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index d3d435248a244fd1c36ac8a096961c6a01b3b774..7890a8425710c6bb7f1933064fad0f526bca434e 100644 (file)
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -699,7 +699,7 @@ 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,
                .floppy_type    = MAC_FLOPPY_SWIM_ADDR2,
@@ -1061,9 +1061,7 @@ 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;