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ide/pci/serverworks.c: Fix corruption/timeouts with MegaIDE

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It turns out from customer reports to Red Hat and some PCI dumps that the
MegaIDE in RAID mode doesn't provide the drive tuning data that the
serverworks driver expects but sometimes does provide something that
fools the code.

For the RAID class case skip the oem setup and don't trust the BIOS data.
We then tune from scratch and this sorts it out. (This has been confirmed
on an afflicted IBM blade)

[libata serverworks.c never trusts the BIOS in the first place so is
accidentally immune]

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Alan Cox 2007-05-24 02:42:38 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 6c6a2a8d20
commit 2074a106f5
1 changed files with 6 additions and 0 deletions
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6
drivers/ide/pci/serverworks.c
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@ -158,6 +158,12 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
pci_read_config_word(dev, 0x4A, &csb5_pio);
pci_read_config_byte(dev, 0x54, &ultra_enable);
/* If we are in RAID mode (eg AMI MegaIDE) then we can't it
turns out trust the firmware configuration */
if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
goto oem_setup_failed;
/* Per Specified Design by OEM, and ASIC Architect */
if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {