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[PATCH] ata_piix: implement force_pcs module parameter

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This patch implements force_pcs module parameter for ata_piix.  If 1,
PCS is ignored, 2 honored.  As there seem to be quite a few ICHs w/
impaired PCS, this option will be useful for cases where the default
setting doesn't work.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-08-22 21:15:58 +09:00 committed by Jeff Garzik
parent f3745a3f9f
commit 9dd9c16465
1 changed files with 20 additions and 1 deletions
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21
drivers/scsi/ata_piix.c
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@ -468,6 +468,11 @@ MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
MODULE_VERSION(DRV_VERSION);
static int force_pcs = 0;
module_param(force_pcs, int, 0444);
MODULE_PARM_DESC(force_pcs, "force honoring or ignoring PCS to work around "
"device mis-detection (0=default, 1=ignore PCS, 2=honor PCS)");
/**
* piix_pata_cbl_detect - Probe host controller cable detect info
* @ap: Port for which cable detect info is desired
@ -812,6 +817,7 @@ static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
}
static void __devinit piix_init_pcs(struct pci_dev *pdev,
struct ata_port_info *pinfo,
const struct piix_map_db *map_db)
{
u16 pcs, new_pcs;
@ -825,6 +831,18 @@ static void __devinit piix_init_pcs(struct pci_dev *pdev,
pci_write_config_word(pdev, ICH5_PCS, new_pcs);
msleep(150);
}
if (force_pcs == 1) {
dev_printk(KERN_INFO, &pdev->dev,
"force ignoring PCS (0x%x)\n", new_pcs);
pinfo[0].host_flags |= PIIX_FLAG_IGNORE_PCS;
pinfo[1].host_flags |= PIIX_FLAG_IGNORE_PCS;
} else if (force_pcs == 2) {
dev_printk(KERN_INFO, &pdev->dev,
"force honoring PCS (0x%x)\n", new_pcs);
pinfo[0].host_flags &= ~PIIX_FLAG_IGNORE_PCS;
pinfo[1].host_flags &= ~PIIX_FLAG_IGNORE_PCS;
}
}
static void __devinit piix_init_sata_map(struct pci_dev *pdev,
@ -933,7 +951,8 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
if (host_flags & ATA_FLAG_SATA) {
piix_init_sata_map(pdev, port_info,
piix_map_db_table[ent->driver_data]);
piix_init_pcs(pdev, piix_map_db_table[ent->driver_data]);
piix_init_pcs(pdev, port_info,
piix_map_db_table[ent->driver_data]);
}
/* On ICH5, some BIOSen disable the interrupt using the