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[PATCH] pata_rz1000: Force readahead off on resume

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The RZ1000 is a generic device except that it has a readahead fifo flaw
that corrupts. We force this off at init time but we want to be paranoid
and force it off at resume as well. I don't know of any actual hardware
that supports both RZ1000 and suspend to RAM but given its a disk muncher
better safe than sorry.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan 2006-11-22 17:23:37 +00:00 committed by Jeff Garzik
parent 34d8dfb1e6
commit ad4a42d287
1 changed files with 33 additions and 15 deletions
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48
drivers/ata/pata_rz1000.c
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@ -21,7 +21,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_rz1000"
#define DRV_VERSION "0.2.2"
#define DRV_VERSION "0.2.3"
/**
@ -92,6 +92,8 @@ static struct scsi_host_template rz1000_sht = {
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
};
static struct ata_port_operations rz1000_port_ops = {
@ -129,6 +131,19 @@ static struct ata_port_operations rz1000_port_ops = {
.host_stop = ata_host_stop
};
static int rz1000_fifo_disable(struct pci_dev *pdev)
{
u16 reg;
/* Be exceptionally paranoid as we must be sure to apply the fix */
if (pci_read_config_word(pdev, 0x40, &reg) != 0)
return -1;
reg &= 0xDFFF;
if (pci_write_config_word(pdev, 0x40, reg) != 0)
return -1;
printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
return 0;
}
/**
* rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
* @pdev: PCI device to register
@ -143,7 +158,6 @@ static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *en
{
static int printed_version;
struct ata_port_info *port_info[2];
u16 reg;
static struct ata_port_info info = {
.sht = &rz1000_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
@ -154,23 +168,25 @@ static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *en
if (!printed_version++)
printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
/* Be exceptionally paranoid as we must be sure to apply the fix */
if (pci_read_config_word(pdev, 0x40, &reg) != 0)
goto fail;
reg &= 0xDFFF;
if (pci_write_config_word(pdev, 0x40, reg) != 0)
goto fail;
printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
port_info[0] = &info;
port_info[1] = &info;
return ata_pci_init_one(pdev, port_info, 2);
fail:
if (rz1000_fifo_disable(pdev) == 0) {
port_info[0] = &info;
port_info[1] = &info;
return ata_pci_init_one(pdev, port_info, 2);
}
printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
/* Not safe to use so skip */
return -ENODEV;
}
static int rz1000_reinit_one(struct pci_dev *pdev)
{
/* If this fails on resume (which is a "cant happen" case), we
must stop as any progress risks data loss */
if (rz1000_fifo_disable(pdev))
panic("rz1000 fifo");
return ata_pci_device_resume(pdev);
}
static const struct pci_device_id pata_rz1000[] = {
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
@ -182,7 +198,9 @@ static struct pci_driver rz1000_pci_driver = {
.name = DRV_NAME,
.id_table = pata_rz1000,
.probe = rz1000_init_one,
.remove = ata_pci_remove_one
.remove = ata_pci_remove_one,
.suspend = ata_pci_device_suspend,
.resume = rz1000_reinit_one,
};
static int __init rz1000_init(void)