Hello,
I'm using an OCZ PATA SSD on Apple PowerBook5,4 computer.
The IDE drive fails to recognize 80-conductor cable that
connects the drive to motherboard to fall back to UDMA33.
This patch fixes this behavior by assuming that the cable is
short-40pin when the model string matches "PowerBook5" and
the motherboard detects 80c cable.
This patch is against drivers/ide/pmac.c in linux 2.6.28.8.
(before applying the patch) hdparm -i /dev/hda
/dev/hda:
Timing buffered disk reads: 90 MB in 3.03 seconds = 29.73 MB/sec
(dmesg 2.6.26)
ide0: Found Apple UniNorth ATA-6 controller, bus ID 3, irq 39
Probing IDE interface ide0...
hda: CORE_PATA, ATA DISK drive
hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
hda: drive side 80-wire cable detection failed, limiting max speed to UDMA33
hda: UDMA/33 mode selected
(after applying the patch) hdparm -i /dev/hda
/dev/hda:
Timing buffered disk reads: 240 MB in 3.02 seconds = 79.42 MB/sec
(dmesg 2.6.28.8)
ide-pmac: Found Apple UniNorth ATA-6 controller (PCI), bus ID 3, irq 39
Probing IDE interface ide0...
hda: CORE_PATA, ATA DISK drive
hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
hda: UDMA/100 mode selected
ide0 at 0xf102a000-0xf102a070,0xf102a160 on irq 39
--
TOMARI Hisanobu <posco.gr...@gmail.com>
*** linux-2.6.28.8/drivers/ide/pmac.c.orig 2009-03-18 13:59:39.645805773 +0900
--- linux-2.6.28.8/drivers/ide/pmac.c 2009-03-18 13:57:38.935818468 +0900
***************
*** 916,926 ****
pmac_ide_hwif_t *pmif =
(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);
/* Get cable type from device-tree. */
if (cable && !strncmp(cable, "80-", 3))
! return ATA_CBL_PATA80;
/*
* G5's seem to have incorrect cable type in device-tree.
--- 916,934 ----
pmac_ide_hwif_t *pmif =
(pmac_ide_hwif_t *)dev_get_drvdata(hwif->gendev.parent);
struct device_node *np = pmif->node;
+ struct device_node *root = of_find_node_by_path("/");
const char *cable = of_get_property(np, "cable-type", NULL);
+ const char *model = of_get_property(root, "model", NULL);
/* Get cable type from device-tree. */
if (cable && !strncmp(cable, "80-", 3))
! {
! if(strncmp(model,"PowerBook5",10)==0)
! /* Some drives fail to detect 80c cable in PowerBook */
! return ATA_CBL_PATA40_SHORT;
! else
! return ATA_CBL_PATA80;
! }
/*
* G5's seem to have incorrect cable type in device-tree.
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