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Commit 9dd9c164 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
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[PATCH] ata_piix: implement force_pcs module parameter 



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: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent f3745a3f

drivers/scsi/ata_piix.c

+20 −1
Original line number Diff line number Diff line
@@ -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