This patch against 2.6.28.8 modifies the behavior of 80c cable detection
of drivers/ide/pmac.c.
As IDE cable used on Apple PowerBook/iBook laptops are always of "Short 40"
type when the firmware says it's 80 conductor one, the cable detection should
return ATA_CBL_PATA40_SHORT on those machines.
This enables to automatically use UDMA5 even with drives that doesn't correctly
detect those cables on Apple laptops.
Signed-off-by: TOMARI Hisanobu <posco.grubb@xxxxxxxxx>
--- linux-2.6.28.8/drivers/ide/pmac.c.orig 2009-03-21 23:07:19.177956922 +0900
+++ linux-2.6.28.8/drivers/ide/pmac.c 2009-03-22 09:57:58.774048828 +0900
@@ -917,10 +917,19 @@ static u8 pmac_ide_cable_detect(ide_hwif
(pmac_ide_hwif_t *)dev_get_drvdata(hwif->gendev.parent);
struct device_node *np = pmif->node;
const char *cable = of_get_property(np, "cable-type", NULL);
+ struct device_node *root = of_find_node_by_path("/");
+ const char *model = of_get_property(root, "model", NULL);
/* Get cable type from device-tree. */
if (cable && !strncmp(cable, "80-", 3))
+ {
+ /* Some drives fail to detect 80c cable in PowerBook */
+ /* These machine use proprietary short IDE cable anyway */
+ if (!strncmp(model,"PowerBook", 9))
+ return ATA_CBL_PATA40_SHORT;
+ else
return ATA_CBL_PATA80;
+ }
/*
* G5's seem to have incorrect cable type in device-tree.
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
